Current Control of Three-phase Grid connected PV Inverters using Adaptive PR Controller

ABSTRACT:

In recent years, there has been a rapid increase in the number of grid connected three phase inverter systems being connected to the distribution network. As a result, the need for high quality, low harmonic distortion, and current injection into the grid is essential. To achieve this, careful consideration of the inverter controller is necessary. Many control methods are based on the traditional proportional-integral controller (PI), or the more recently adopted Proportional Resonant controller (PR). This paper presents a new technique of minimizing the error of the current control in a three phase grid connected inverter using a readily implementable Adaptive Proportional Resonance controller. Simulation and experimental results demonstrate the effectiveness of the proposed technique.

 

KEYWORDS:

  1. Proportional Resonant
  2. Grid- connected Inverter
  3. LCL filter.

 

SOFTWARE: MATLAB/SIMULINK

 

BLOCK DIAGRAM:

 Adaptive PR controller in stationary reference control

Fig 1 Adaptive PR controller in stationary reference control

  

EXPECTED SIMULATION RESULTS:

 Simulation result waveforms. (a) Three phase voltage waveform. (b) Three phase current waveform. 

Fig.2 Simulation result waveforms. (a) Three phase voltage waveform. (b) Three phase current waveform.

Simulation waveforms for conventional PR controller. (a) i-alpha. (b) ibeta.

Fig.3 Simulation waveforms for conventional PR controller. (a) i-alpha. (b) ibeta.

. Simulation waveforms for adaptive PR controller. (a) i-alpha. (b) i-beta.

Fig. 4. Simulation waveforms for adaptive PR controller. (a) i-alpha. (b) i-beta.

 Simulation result waveforms unbalanced grid condition. (a) Three phase voltage waveform. (b) Three phase current waveform.

Fig. 5. Simulation result waveforms unbalanced grid condition. (a) Three phase voltage waveform. (b) Three phase current waveform.

   

CONCLUSION:

This paper has considered the impact of an adaptive PR current control scheme of a three phase grid connected inverter. In particular, this work has shown the performance of the adaptive PR controller compared with the conventional PR controller which is popular in grid connected inverters. Simulation studies confirm that the adaptive PR controller demonstrates better performance under normal and abnormal operating conditions. There is no steady state error output, and the harmonic content of the current waveform is very low. In addition, the adaptive PR controller offers superior output power regulation, and improved power quality performance. Overall, it can be concluded that the adaptive PR controller is better suited in the event of grid faults, or operation in weak grid environments, compared to fix gain controllers.

 

REFERENCES:

  • Wuhua and H. Xiangning, “Review of Nonisolated High-Step-Up DC/DC Converters in Photovoltaic Grid-Connected Applications,” Industrial Electronics, IEEE Transactions on, vol. 58, pp. 1239-1250, 2011.
  • Chenlei, R. Xinbo, W. Xuehua, L. Weiwei, P. Donghua, and W. Kailei, “Step-by-Step Controller Design for LCL-Type Grid- Connected Inverter with Capacitor–Current-Feedback Active-Damping,” Power Electronics, IEEE Transactions on, vol.29, pp. 1239-1253, 2014.
  • “IEEE Standard for Interconnecting Distributed Resources With Electric Power Systems,” IEEE Std 1547-2003, 0_1-16, 2003.
  • Nicastri and A. Nagliero, “Comparison and evaluation of the PLL techniques for the design of the grid-connected inverter systems,” in Industrial Electronics (ISIE), 2010 IEEE International Symposium on, 2010, pp. 3865-3870.

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Automatic droop control for a low voltage DC Microgrid

ABSTRACT

A DC microgrid (DC-MG) provides an effective mean to integrate various sources, energy storage units and loads at a common dc-side. The droop-based, in the context of a decentralized control, has been widely used for the control of the DC-MG. However, the conventional droop control cannot achieve both accurate current sharing and desired voltage regulation. This study proposes a new adaptive control method for DC-MG applications which satisfies both accurate current sharing and acceptable voltage regulation depending on the loading condition. At light load conditions where the output currents of the DG units are well below the maximum limits, the accuracy of the current sharing process is not an issue. As the load increases, the output currents of the DG units increase and under heavy load conditions accurate current sharing is necessary. The proposed control method increases the equivalent droop gains as the load level increases and achieves accurate current sharing. This study evaluates the performance and stability of the proposed method based on a linearised model and verifies the results by digital time-domain simulation and hardware-based experiments.

 

SOFTWARE: MATLAB/SIMULINK

 

BLOCK DIAGRAM:

Fig. 1 Simplified DC-MG with two DG units

 

EXPECTED SIMULATION RESULTS:

 

Fig. 2 Output currents of the DG units obtained in Simulation Results

a Conventional droop control method with small droop gains

b Conventional droop control method with large droop gains

c Proposed method

 

 

Fig. 3 Output voltages of the DG units obtained in Simulation Results

a Conventional droop control method with small droop gains

b Conventional droop control method with large droop gains

c Proposed method

 

CONCLUSION

This paper presents a new control scheme for DC-MG without using any communication links. In the conventional droop control, small droop gains result in good voltage regulation but inaccurate current sharing, and large droop gains result in accurate current sharing but unacceptable voltage regulation. To overcome this drawback, a new control method is proposed in which the equivalent droop gains automatically change based on the loading condition. The simulation results show and the experimental results verify that by adaptively changing the droop gains according to the load size, both accurate current sharing and desirable voltage regulation are achieved.

REFERENCES

  • Guerrero, J., Loh, P.C., Lee, T.-L., et al.: ‘Advanced control architectures for intelligent microgrids; part ii: Power quality, energy storage, and ac/dc microgrids’, IEEE Trans. Ind Electron., 2013, 60, (4), pp. 1263–1270
  • Vandoorn, T., De Kooning, J., Meersman, B., et al.: ‘Automatic power-sharing modification of p/v droop controllers in low-voltage resistive microgrids’, IEEE Trans. Power Deliv., 2012, 27, (4), pp. 2318–2325
  • Khorsandi, A., Ashourloo, M., Mokhtari, H.: ‘An adaptive droop control method for low voltage dc microgrids’. 2014 Fifth Power Electronics, Drive Systems and Technologies Conf. (PEDSTC), 2014, pp. 84–89
  • Loh, P.C., Li, D., Chai, Y.K., et al.: ‘Hybrid ac-dc microgrids with energy storages and progressive energy flow tuning’, IEEE Trans. Power Electron., 2013, 28, (4), pp. 1533–1543
  • Loh, P., Li, D., Chai, Y.K., et al.: ‘Autonomous operation of hybrid microgrid with ac and dc subgrids’, IEEE Trans. Power Electron., 2013, 28, (5), pp. 2214–2223

New Perspectives on Droop Control in AC Microgrid

ABSTRACT

Virtual impedance, angle droop and frequency droop control play important roles in maintaining system stability, and load sharing among distributed generators (DGs) in microgrid. These approaches have been developed into three totally independent concepts, but a strong correlation exists. In this letter, their similarities and differences are revealed. Some new findings are established as follows: 1) the angle droop control is intrinsically a virtual inductance method; 2) virtual inductance method can also be regarded as a special frequency droop control with a power derivative feedback; 3) the combination of virtual inductance method and frequency droop control is equivalent to the proportional–derivative (PD) type frequency droop, which is introduced to enhance the power oscillation damping. These relationships provide new insights into the design of the control methods for DGs in microgrid.

 

KEYWORDS

  1. Microgrid
  2. Droop control
  3. Virtual Impedance

 

SOFTWARE: MATLAB/SIMULINK

  

BLOCK DIAGRAM:

block diagram

Fig. 1 Equivalent output voltage source considering virtual impedance.

 

EXPECTED SIMULATION RESULTS:

Fig. 2 Power response during load change in conventional frequency droop. (a) Active power, (b) reactive power.

Fig. 3 Power response during load change in frequency droop plus virtual reactance. (a) Active power, (b) reactive power.

Fig. 4 Power response during load change in modified frequency droop. (a) Active power, (b) reactive power.

 

CONCLUSION

This letter compares the similarities and differences among three different concepts, virtual impedance method, angle droop and frequency droop control. Although each of them has been well researched, new perspectives are bought to readers by relating all three together. Thus, the inherent relationships are established, and new insights into the controller design are provided. Finally, the modified droop control unifies these three independently developed droop control methods into a generalized theoretical framework. To the reader, this letter explores the possibilities of further enhancing the existing methods and inspiring the development of new methods.

 

REFERENCES

  • M. Guerrero, L. GarciadeVicuna, and J. Matas, “Output impedance design of parallel-connected UPS inverters with wireless load-sharing control,” IEEE Trans. Ind. Electron., vol.52, no.4, pp.1126-1135, Aug.2005.
  • He and Y. Li, “Analysis, design, and implementation of virtual impedance for power electronics interfaced distributed generation,” IEEE Trans. Ind. Appl., vol.47, no.6, pp. 2525-2538, Nov. 2011.
  • Mahmood, D. Michaelson, and J. Jiang, “Accurate reactive power sharing in an islanded microgrid using adaptive virtual impedances,” IEEE Trans. Power Electron., vol.30, no.3, pp. 1605-1617, Mar.2015.
  • Majumder, G. Ledwich, A. Ghosh, S. Chakrabarti, and F. Zare, “Droop control of converter-interfaced microsources in rural distributed generation, ” IEEE Trans. Power Del., vol. 25, no. 4, pp.2768-2778, Oct. 2010.
  • C, Chandorkar, D. M. Divan, and R. Adapa, “Control of parallel connected inverters in standalone ac supply systems,” IEEE Trans. Ind. Appl., vol.29, no.1 pp.136-143, Jan.1993.

 

Control Strategy of Three-Phase Battery Energy Storage Systems for Frequency Support in Microgrids and with Uninterrupted Supply of Local Loads

 

ABSTRACT

Frequency control in autonomous microgrids (MG) with high penetration of renewable energy sources represents a great concern to ensure the system stability. In this regard, this paper presents an enhanced control method for battery energy storage systems (BESS) to support the frequency of MG and with the ability of disconnecting from the MG to supplying in the island mode a local consumer. A frequency controller, combining a conventional droop control with an inertia emulation function, governs the BESS active power transfer during the primary frequency control level. The BESS may also provide voltage support in the point of common coupling with the MG. Moreover, the proposed BESS may compensate, partially or totally, the power absorbed by the local loads in order to improve the MG frequency response. When the MG power quality worsens below a certain level, in terms of voltage and frequency, the BESS detaches from the MG and continues to operate islanded.

The reconnection is accomplished following a smoothly resynchronization of the local voltage with the MG, without disturbing the local loads supply. Additionally, this paper also discusses about the aspects related to the BESS management and its integration within the proposed system. The simulation and experimental results assess the feasibility of the proposed control solutions. Frequency control in autonomous microgrids (MG) with high penetration of renewable energy sources represents a great concern to ensure the system stability. In this regard, this paper presents an enhanced control method for battery energy storage systems (BESS) to support the frequency of MG and with the ability of disconnecting from the MG to supplying in the island mode a local consumer. A frequency controller, combining a conventional droop control with an inertia emulation function, governs the BESS active power transfer during the primary frequency control level. The BESS may also provide voltage support in the point of common coupling with the MG.

Moreover, the proposed BESS may compensate, partially or totally, the power absorbed by the local loads in order to improve the MG frequency response. When the MG power quality worsens below a certain level, in terms of voltage and frequency, the BESS detaches from the MG and continues to operate islanded. The reconnection is accomplished following a smoothly resynchronization of the local voltage with the MG, without disturbing the local loads supply. Additionally, this paper also discusses about the aspects related to the BESS management and its integration within the proposed system. The simulation and experimental results assess the feasibility of the proposed control solutions.

 

KEYWORDS

  1. Battery energy storage systems (BESS)
  2. Frequency control
  3. Inverter, microgrid (MG)
  4. Seamless transfer

 

SOFTWARE: MATLAB/SIMULINK

  

BLOCK DIAGRAM:

 

 

 

 

 

Fig. 1 BESS Structure

 

EXPECTED SIMULATION RESULTS:

 

 

 

 

 

Fig. 2. MG frequency (Top) and BESS active power (Bottom) for different operating conditions (simulation results).

 

 

 

 

 

Fig. 3 MG frequency (Top) and BESS active power (Bottom) for different levels of the local load compensation

 

CONCLUSION

This paper presented a Battery Energy Storage Systems BESS mainly designed to provide frequency support in MG, but having special control features. The BESS can operate both connected to the MG (G-mode) or in (I-mode), whereas the transition between the two states is seamlessly coordinated by an original control method. The BESS may serve local sensitive consumers connected on the local bus, by including special control functions to protect them in adverse MG operating conditions. The BESS management is also taking into discussion from the perspective of its influence upon the proposed controller performance. Simulations and experimental results were provided to validate the proposed BESS. An improved frequency controller, with conventional droop and virtual inertia was proposed and in the simulation results, it proved to be an efficient solution, resulting in faster damping of the MG frequency oscillations. Moreover, by partially or totally compensating the local loads, the MG is relieved by the corresponding power disturbance produced by their stochastic operation and thus the MG frequency deviation can be diminished.

By this approach, the BESS along with the local loads may be considered as a sort of smart load. The transition between G-mode to I-mode took place when the PCC power quality worsened and the experimental results showed a clean transfer without important voltage and frequency variations. The transition between I-mode to G-mode included a smoothly synchronization period of the local voltage with the MG voltage, after which the switching to G-mode did not disturb either the local loads or the MG. During I-mode, the local loads are supplied directly by the BESS and the presented experimental results including a comprehensive operating case, proved that the voltage control quality falls into the required standards. Future studies are intended to be carried out on the system availability to contribute to the MG power quality improvement.

 

REFERENCES

  • European Commission, Energy Roadmap 2050, 2011. [Online].Available: http://ec.europa.eu/energy/energy2020/roadmap/index_en.htm
  • Bevrani, A. Ghosh, and G. Ledwich, “Renewable energy sources and frequency regulation: Survey and new perspectives,” IET Renew. Power Gen., vol. 4, no. 5, pp. 438–457, Sep. 2010.
  • Tan, Q. Li, and H. Wang, “Advances and trends of energy storage technology in Microgrid,” Int. J. Elect. Power Energy Syst., vol. 44, no. 1, pp. 179–191, Jan. 2013.
  • Bottrell, M. Prodanovic, and T. C. Green, “Dynamic stability of a microgrid with an active load,” IEEE Trans. Power Electron., vol. 28, no. 11, pp. 5107–5119, Nov. 2013.
  • A. P. Lopes, F. J. Soares, and P. M. R. Almeida, “Integration of electric vehicles in the electric power system,” Proc. IEEE, vol. 99, no. 1, pp. 168–183, Jan. 2011.

A Novel Three-Phase Three-Leg AC/AC Converter Using Nine IGBTs

ABSTRACT:

This paper proposes a novel three-phase nine-switch ac/ac converter topology. This converter features sinusoidal inputs and outputs, unity input power factor, and more importantly, low manufacturing cost due to its reduced number of active switches. The operating principle of the converter is elaborated; its modulation schemes are discussed. Simulated semiconductor loss analysis and comparison with the back-to-back two-level voltage source converter are presented. Finally, experimental results from a 5-kVA prototype system are provided to verify the validity of the proposed topology.

 

KEYWORDS:

  1. AC/AC converter
  2. pulse width modulation (PWM)
  3. reduced switch count topology

 

SOFTWARE: MATLAB/SIMULINK

CIRCUIT DIAGRAM:Fig: 1 B2B 2L-VSC.

Fig: 2 Proposed nine switch ac to ac converter with a quasi dc link

 

EXPECTED SIMULATION RESULTS:

  

Fig. 3. Measured rectifier and inverter waveforms (CF-mode operation). (a) Input and output voltages. (b) Voltage spectrum. (c) Input and output currents.

Fig. 4. Measured waveforms and spectrum (VF mode operation). (a) Input and output voltages. (b) Spectrum.

Fig. 5. Measured waveforms when the inverter output frequency has a step increase from 30 to 120 Hz, while the rectifier input frequency remains at 60 Hz. (a) Input and output voltages. (b) Input and output currents.

 

CONCLUSION:

A novel nine-switch PWMac/ac converter topology was proposed in this paper. The topology uses only nine IGBT devices for ac to ac conversion through a quasi dc-link circuit. Compared with the conventional back-to-back PWM VSC using 12 switches and the matrix converter that uses 18, the number of switches in the proposed converter is reduced by 33% and 50%, respectively. The proposed converter features sinusoidal inputs and outputs, unity input power factor, and low manufacturing cost. The operating principle of the converter was elaborated, and modulation schemes for constant and VF operations were developed. Simulation results including a semiconductor loss analysis and comparison were provided, which reveal that the proposed converter, while working in CF mode, has an overall higher efficiency than the B2B 2L-VSC at the expense of uneven loss distribution. However, the VF-mode version requires IGBT devices with higher ratings and dissipates significantly higher losses, and thus, is not as attractive as its counterpart. Experimental verification is carried out on a 5-kVA prototype system.

 

REFERENCES:

 Wu, High-power Converters and AC Drives. Piscataway, NJ: IEEE/Wiley, 2006.

  • Singh, B. N. Singh, A. Chandra, K. Al-Haddad, A. Pandey, and D. P. Kothari, “A review of three-phase improved power quality AC– DC converters,” IEEE Trans. Ind. Electron., vol. 51, no. 3, pp. 641–660, Jun. 2004.
  • Blaabjerg, S. Freysson, H. H. Hansen, and S. Hansen, “A new optimized space-vector modulation strategy for a component-minimized Voltage source inverter,” IEEE Trans. Power Electron., vol. 12, no. 4, pp. 704–714, Jul. 1997.
  • L. A. Ribeiro, C. B. Jacobina, E. R. C. da Silva, and A. M. N. Lima, “AC/AC converter with four switch three phase structures,” in Proc. IEEE PESC, 1996, vol. 1, pp. 134–139.

Matrix Converters: A Technology Review

ABSTRACT

The matrix converter is an array of controlled semiconductor switches that connects directly the three-phase source to the three-phase load. This converter has several attractive features that have been investigated in the last two decades. In the last few years, an increase in research work has been observed, bringing this topology closer to the industrial application. This paper presents the state-of-the-art view in the development of this converter, starting with a brief historical review. An important part of the paper is dedicated to a discussion of the most important modulation and control strategies developed recently. Special attention is given to present modern methods developed to solve the commutation problem. Some new arrays of power bidirectional switches integrated in a single module are also presented. Finally, this paper includes some practical issues related to the practical application of this technology, like overvoltage protection, use of filters, and ride-through capability.

KEYWORDS

  1. AC–AC power conversion
  2. Converters
  3. Matrix

 

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

 matrix converter

Fig. 1. Simplified circuit of a 3 x 3 matrix converter

 

EXPECTED SIMULATION RESULTS:

Phase output voltage

Fig. 2. Typical waveforms. (a) Phase output voltage. (b) Load current.

maximum voltage ratio

Fig. 3. Illustrating maximum voltage ratio of 50%.

voltage ratio improvement
Fig. 4. Illustrating voltage ratio improvement to 87%.

Line-to-line voltage and current

Fig. 5. Line-to-line voltage and current in the load with the indirect method. Output frequency of 50 Hz.

CONCLUSION:

 After two decades of research effort, several modulation and control methods have been developed for the matrix converter, allowing the generation of sinusoidal input and output currents, operating with unity power factor using standard processors. The most important practical implementation problem in the matrix converter circuit, the commutation problem between two controlled bidirectional switches, has been solved with the development of highly intelligent multistep commutation strategies. The solution to this problem has been made possible by using powerful digital devices that are now readily available in the market.

 

REFERENCES:

 Gyugi and B. Pelly, Static Power Frequency Changers: Theory, Performance and Applications. New York: Wiley, 1976.

  • Brandt, “Der Netztaktumrichter,” Bull. ASE, vol. 62, no. 15, pp. 714–727, July 1971.
  • Popov, “Der Direktumrichter mit zyklischer Steuerung,” Elektrie, vol. 29, no. 7, pp. 372– 376, 1975.
  • Stacey, “An unrestricted frequency changer employing force commutated thyristors,” in Proc. IEEE PESC’76, 1976, pp. 165–173.
  • Jones and B. Bose, “A frequency step-up cycloconverter using power transistors in inverse-series mode,” Int. J. Electron., vol. 41, no. 6, pp. 573–587, 1976.
  • MATRIX Converter

Control for Grid-Connected and Intentional Islanding Operations of Distributed Power Generation

ABSTRACT:

Intentional islanding describes the condition in which a microgrid or a portion of the power grid, which consists of a load and a distributed generation (DG) system, is isolated from the remainder of the utility system. In this situation, it is important for the microgrid to continue to provide adequate power to the load. Under normal operation, each DG inverter system in the microgrid usually works in constant current control mode in order to provide a preset power to the main grid. When the microgrid is cut off from the main grid, each DG inverter system must detect this islanding situation and must switch to a voltage control mode. In this mode, the microgrid will provide a constant voltage to the local load. This paper describes a control strategy that is used to implement grid-connected and intentional-islanding operations of distributed power generation. This paper proposes an intelligent load-shedding algorithm for intentional islanding and an algorithm of synchronization for grid reconnection.

 

KEYWORDS:

  1. Distributed generation (DG)
  2. Grid-connected operation
  3. Intentional-islanding operation
  4. Islanding detection
  5. Load shedding
  6. Synchronization

 

SOFTWARE: MATLAB/SIMULINK

 

BLOCK DIAGRAM:

grid connected  

Fig. 1. Schematic diagram of the grid connected inverter system.

 

EXPECTED SIMULATION RESULTS:

grid-connected to intentional-islanding operation.

Fig. 2. From grid-connected to intentional-islanding operation.

Synchronization for grid reconnection.
Fig. 3. Synchronization for grid reconnection.

Phase voltage (top) without and (bottom) with the synchronization algorithm.

Fig. 4. Phase voltage (top) without and (bottom) with the synchronization algorithm.


Fig. 5. Phase voltage
Va without the load-shedding algorithm.

Phase voltage Va with the load-shedding algorithm

Fig. 6.Phase voltage Va with the load-shedding algorithm.

CONCLUSION:

 Through this paper, the control, islanding detection, load shedding, and reclosure algorithms have been proposed for the operation of grid-connected and intentional-islanding DGs. A controller was designed with two interface controls: one for grid connected operation and the other for intentional islanding operation. An islanding-detection algorithm, which was responsible for the switch between the two controllers, was presented. The simulation results showed that the detection algorithm can distinguish between islanding events and changes in the loads and can apply the load-shedding algorithms when needed. The reclosure algorithm causes the DG to resynchronize itself with the grid. In addition, it is shown that the response of the proposed control schemes is capable of maintaining the voltages and currents within permissible levels during grid connected and islanding operation modes. The experimental results showed that the proposed control schemes are capable of maintaining the voltages within the standard permissible levels during grid connected and islanding operation modes. In addition, it was shown that the reclosure algorithm causes the DG to resynchronize itself with the grid.

 

REFERENCES:

  • Jayaweera, S. Galloway, G. Burt, and J. R. McDonald, “A sampling approach for intentional islanding of distributed generation,” IEEE Trans. Power Syst., vol. 22, no. 2, pp. 514– 521, May 2007.
  • M. Guerrero, J. C. Vásquez, J. Matas, M. Castilla, and L. García de Vicuña, “Control strategy for flexible microgrid based on parallel lineinteractive UPS systems,” IEEE Trans. Ind. Electron., vol. 56, no. 3, pp. 726–736, Mar. 2009.
  • Fuangfoo, T. Meenual,W.-J. Lee, and C. Chompoo-inwai, “PEA guidelines for impact study and operation of DG for islanding operation,” IEEE Trans. Ind. Appl., vol. 44, no. 5, pp. 1348–1353, Sep./Oct. 2008. 156 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 58, NO. 1, JANUARY 2011
  • Carpaneto, G. Chicco, and A. Prunotto, “Reliability of reconfigurable distribution systems including distributed generation,” in Proc. Int. Conf. PMAPS, 2006, pp. 1–6.
  • IEEE Recommended Practice for Utility Interface of Photovoltaic (PV) Systems, IEEE Std 929-2000, 2000, p. i.

Simulation a Shunt Active Power Filter using MATLAB /SIMULINK

ABSTRACT:

 Along with increasing demand on improving power quality, the most popular technique that has been used is Active Power Filter (APF); this is because APF can easily eliminate unwanted harmonics, improve power factor and overcome voltage sags. This paper will discuss and analyze the simulation result for a three-phase shunt active power filter using MATLAB/SIMULINK program. This simulation will implement a non-linear load and compensate line current harmonics under balance and unbalance load. As a result of the simulation, it is found that an active power filter is the better way to reduce the total harmonic distortion (THD) which is required by quality standards IEEE-519.

 

KEYWORDS:

  1. APF
  2. d-q theorem,
  3. THD
  4. Power Quality
  5. ADS
  6. Instantaneous Power theory

 

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

shunt active power filter Fig.1. Diagram illustrating component of shunt connected active filter with the waveform showing cancellation of harmonics from an ASD load.

 

SIMULATION RESULTS:

Fig. 2. Three phase line voltage  

                               Fig. 3. Three phase line current

Fig. 4. Three phase load current

                                          Fig. 5. Active filter current

Fig. 6. Line current for phase A

Fig. 7. Load current for phase A

                                   

Fig. 8. Active filter current for phase A

Fig. 9. THD for line current

Fig. 10. THD for load current

 

CONCLUSION:

The Increasing usage of non-linear load in electrical power system which will produce the current and voltage harmonics and associate harmonics problem in power system become more serious and directly affecting the power quality. Conventional way of harmonics elimination by using passive filter might suffer from parasitic problem. It has been shown that three phase active filter based on p-q theory can be implemented for harmonic mitigation and power factor correction. Harmonics mitigation carried out by the active filter meets the IEEE-519 standard requirements.

 

REFERENCES:

 Emadi, A. Nasiri, and S. B. Bekiarov, “Uninterruptible Power Supplies and Active Filter”, Florida, 2005, pp. 65-111.

  • W. Hart, “Introduction to Power Electronics”, New Jersey, 1997, pp. 291-335.
  • McGranaghan, “Active Filter Design and Specification for Control of Harmonics in Industrial and Commercial Facilities”, 2001.
  • Round, H. Laird and R. Duke, “An Improved Three-Level Shunt Active Filter”, 2000.
  • Lev-Ari, “Hilbert Space Techniques for Modeling and Compensation of Reactive Power in Energy Processing Systems”, 2003.

Final Year Electrical Projects

AT_B01 An Integrated Boost Resonant Converter for Photovoltaic Applications IEEE 2013-14
AT_B02 Coordinated control and energy management of distributed generation inverters in a micro grid IEEE 2013-14
AT_B03 Statcom control at wind farms with fixed speed induction generators under asymmetrical grid faults IEEE 2013-14
AT_B04 Control of the Dynamic Voltage Restorer to Improve Voltage Quality

 

IEEE 2014-15
AT_B05 Research on Three-phase Voltage Type PWM Rectifier System Based on SVPWM control RJASET 2013-14
AT_B06 Dynamic Modeling of Microgrid for Grid Connected and Intentional Islanding Operation IEEE 2012-13
AT_B07 High-Step-Up and High-Efficiency Fuel-Cell Power Generation System with Active-Clamp Flyback-Forward Converter

 

IEEE 2012-13
AT_B08 Direct Power Control of Series Converter of Unified Power-Flow Controller With Three-Level Neutral Point Clamped Converter

 

IEEE 2012-13
AT_B09 Analysis of Discrete and Space Vector PWM Controlled Hybrid Active Filters For Power Quality Enhancement

 

IEEE 2012-13

and so on…….

Electrical engineering is a field of engineering that generally deals with the study and application of electricity, electronics, and electro magnetism. This field first became an identifiable occupation in the later half of the 19th century after commercialization of the electric telegraph, the telephone, and electric power distribution and use. Subsequently, broad casting and recording media made electronics part of daily life. The invention of the transistor, and later the integrated circuit, brought down the cost of electronics to the point they can be used in almost any household object.

Electrical engineering has now subdivided into a wide range of sub fields including electronics, digital computers, power engineering, tele communications, control systems, radio-frequency engineering, signal processing, instrumentation, and microelectronics. Many of these sub disciplines overlap and also overlap with other engineering branches, spanning a huge number of specializations such as hardware engineering, power electronics, electro magnetics & waves, microwave engineering, nanotechnology, electro chemistry, renewable energies, mechatronics, electrical materials science, and many more.

Electrical engineers typically hold a degree in electrical engineering or electronic engineering. Practicing engineers may have professional certification and be members of a professional body. Such bodies include the Institute of Electrical and Electronics Engineers (IEEE) and the Institution of Engineering and Technology (professional society) (IET).

Electrical engineers work in a very wide range of industries and the skills required are likewise variable. These range from basic circuit theory to the management skills required of a project manager. The tools and equipment that an individual engineer may need are similarly variable, ranging from a simple voltmeter to a top end analyzer to sophisticated design and manufacturing software.

 

Matlab Simulink projects in Hyderabad

Matlab Simulink projects in Hyderabad

Matlab Simulink projects in Hyderabad

1. Cascaded Dual Model Predictive Control of an Active Front-End Rectifier
2. Simple Time Averaging Current Quality Evaluation of a Single-Phase Multilevel PWM Inverter
3. Nonlinear Control of Single-Phase PWM Rectifiers With Inherent Current-Limiting Capability
4. Impact of SFCL on the Four Types of HVDC Circuit Breakers by Simulation
5. An Adaptive SPWM Technique for Cascaded Multilevel Converters with Time-Variant DC Sources
6. Model-Based Control for a Three-Phase Shunt Active Power Filter
7. Design of a multi level inverter with reactive power control ability for connecting pv cells to the grid
8. DSTATCOM supported induction generator for improving power quality
9. Improved equal current approach for reference current generation in shunt applications under unbalanced and distorted source and load conditions
10. A Hybrid-STATCOM With Wide Compensation Range and Low DC-Link Voltage

Matlab Simulink projects in Hyderabad

ELECTRICAL ENGINEERING is a field of engineering that generally deals with the study and application of electricity, electronics, and electro magnetism. This field first became an identifiable occupation in the later half of the 19th century after commercialization of the electric telegraph, the telephone, and electric power distribution and use. Subsequently, broad casting and recording media made electronics part of daily life. The invention of the transistor, and later the integrated circuit, brought down the cost of electronics to the point they can be used in almost any household object.

Electrical engineering has now subdivided into a wide range of sub fields including electronics, digital computers, power engineering, tele communications, control systems, radio-frequency engineering, signal processing, instrumentation, and microelectronics. Many of these sub disciplines overlap and also overlap with other engineering branches, spanning a huge number of specializations such as hardware engineering, power electronics, electro magnetics & waves, microwave engineering, nanotechnology, electro chemistry, renewable energies, mechatronics, electrical materials science, and many more.

POWER ELECTRONICS is the application of solid-state electronics to the control and conversion of electric power. The first high power electronic devices were mercury-arc valves. In modern systems the conversion is performed with semiconductor switching devices such as diodes, thyristors and transistors, pioneered by R. D. Middlebrook and others beginning in the 1950s. In contrast to electronic systems concerned with transmission and processing of signals and data, in power electronics substantial amounts of electrical energy are processed. An AC/DC converter (rectifier) is the most typical power electronics device found in many consumer electronic devices, e.g. television sets, personal computers, battery chargers, etc. The power range is typically from tens of watts to several hundred watts. In industry a common application is the variable speed drive (VSD) that is used to control an induction motor. The power range of VSDs start from a few hundred watts and end at tens of megawatts.

An ELECTRIC POWER SYSTEM is a network of electrical components deployed to supply, transfer, and use electric power. An example of an electric power system is the the grid that provides power to an extended area. An electrical grid power system can be broadly divided into the generators that supply the power, the transmission system that carries the power from the generating centres to the load centres, and the distribution system that feeds the power to nearby homes and industries. Smaller power systems are also found in industry, hospitals, commercial buildings and homes. The majority of these systems rely upon three-phase AC power—the standard for large-scale power transmission and distribution across the modern world. Specialised power systems that do not always rely upon three-phase AC power are found in aircraft, electric rail systems, ocean liners and automobiles.

MATLAB (matrix laboratory) is a multi-paradigm numerical computing environment and fourth-generation programming language. A proprietary programming language developed by MathWorks, MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages, including C, C++, C#, Java, Fortran and Python.

SIMULINK, developed by MathWorks, is a graphical programming environment for modeling, simulating and analyzing multidomain dynamic systems. Its primary interface is a graphical block diagramming tool and a customizable set of block libraries. It offers tight integration with the rest of the MATLAB environment and can either drive MATLAB or be scripted from it. Simulink is widely used in automatic control and digital signal processing for multidomain simulation and Model-Based Design.Matlab Simulink projects in Hyderabad

Matlab Simulink projects in Hyderabad