Novel High Performance Stand Alone Solar PV System with High Gain, High Efficiency DC-DC Converter Power Stages

ABSTRACT:  

This paper proposes a novel 3- stand-alone solar PV system configuration that uses high gain, high efficiency (96%) dc-dc converters both in the forward power stage as well as the bidirectional battery interface. The high voltage gain converters enable the use of low voltage PV and battery sources. This results in minimization of partial shading and parasitic capacitance effects on the PV source. Series connection of a large number of battery modules is obviated, preventing the overcharging and deep discharging issues that reduce the battery life. Also, the proposed configuration facilitates “required power tracking (RPT)” of the PV source as per the load requirements eliminating the use of expensive and ‘difficult to manage’ dump loads. High performance inverter operation is achieved through abc to dq reference frame transformation, which helps in generating precise information about the load’s active power component for RPT, regulation of ac output voltage and minimization of control complexity. Inverter output voltage is regulated by controlling the modulation index of sinusoidal pulse width modulation, resulting in a stable and reliable system operation. The active power demand is controlled by regulating the dc link voltage. All the analytical, simulation and experimental results of this work are presented.

 KEYWORDS:

  1. Power conversion
  2. Pulse width modulation converters
  3. Power conditioning, Inverters
  4. Three-phase electric power
  5. Power control
  6. Photovoltaic cells
  7. Energy conversion
  8. Solar power generation
  9. High gain DC-DC Converter
  10. MPPT

 SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

 

 

Fig. 1. Simplified block diagram of a two stage stand alone PV system

 EXPECTED SIMULATION RESULTS:

Fig. 2. Simulation results of the proposed system during the sequence of events considered

Fig.3 Dynamic response of the dc link: (a) An effective load (Reff) connected across the dc link; (b) Response to step change in effective load (200W to 400W); (c) Response to step change in reference dc link voltage, * Vdc from 250V to 400V.

 CONCLUSION:

 This paper has described and implemented a novel 3- solar PV inverter system for stand-alone applications. Considering that high PV side voltage leads to several drawbacks, a low voltage PV source is used in the system. The limitation of low voltage PV source is overcome by using a special high voltage gain front end dc-dc converter capable of operating at high efficiency and MPPT. The proposed scheme is particularly conducive to long battery life by as it ensures no battery overcharge or deep discharge. For this purpose, the   conventional MPPT scheme is replaced by RPT, which ensures only the required power is tracked from the PV source. This prevents the drawing of excess power from the PV source and the use and management of expensive ‘dump’ loads. Not only the main power stage, but the battery interfacing bi-directional stage also supports high voltage gain with high efficiency. Due to the use of special high gain, high efficiency converters in the power stage, the overall efficiency of the system is 94%. Preliminary investigations have yielded encouraging results. The capacity of the proposed control strategy can be enhanced for high power operation by interfacing other renewable sources (fuel cell stack, wind etc.) to the dc link of the proposed system without significantly altering the control strategy. In spite of the good performance of the proposed system, as verified through several simulation and experimental results, there are some limitations too, as listed below:

  1. The high gain, high efficiency dc-dc converters used in the proposed system may be difficult to design for high power levels.
  2. In the proposed system, battery is interfaced with the high voltage (400V) dc link requiring a high voltage gain, high efficiency dc-dc converter. Battery interfacing to the low voltage (40V) dc bus should be explored.
  3. The proposed system uses a large number of sensors, which may increase the cost and complexity. All these issues are being currently investigated and the findings will be reported in a future paper.

REFERENCES:

[1] S.R. Bhat, A. Pittet and B.S. Sonde, “Performance optimization of induction motor-pump system using photovoltaic energy source,” IEEE Transactions on Industry Applications, vol. IA- 23, no. 6, pp. 995–1000, Nov. 1987.

[2] S. Duryea, S. Islam and W. Lawrence, “A battery management system for stand alone photovoltaic energy systems,” 34th IEEE IAS Annual Meeting, vol. 4, pp. 2649-2654, Phoenix, AZ , 3rd – 7th Oct., 1999.

[3] M. Uzunoglu, O. C. Onar, and M. S. Alam, “Modeling, control and simulation of a PV/FC/UC based hybrid power generation system for stand-alone applications” Renewable Energy, vol. 34, no. 3, pp. 509-520, Mar. 2009.

[4] R. M. Cuzner and G. Venkataramanan, “The status of dc microgrid protection,” IEEE Industry Applications Society Annual  Meeting, pp. 1-8, 5th-9th Oct. 2008

[5] P. Sharma and V. Agarwal, “Exact maximum power point tracking of grid-connected partially shaded PV source using current compensation concept,” IEEE Transactions on Power Electronics, vol. 29, no. 9, pp. 4684-4692, Sep. 2014.

Sizing and Simulation of an Energy Sufficient Stand-alone PV Pumping System

ABSTRACT:

 In this paper, methods for sizing of PV pumping systems and the simulation of (DTC) Direct Torque Control of induction motor that is used for piloting a water pump supplied by a photovoltaic generator are presented. The sizing of the PV pumping system is based on the calculation of the water needs, the required hydraulic energy and the estimation of available solar power. The best sizing of the PV pumping system may further help in reducing its cost and optimize its efficiency. The proposed system includes a solar panel, a DC/DC converter with MPPT control, a voltage inverter with pulse width modulation (PWM). The Pump is driven by a Three Phase Induction Motor. In order to control the water flow in the pump, Direct torque control of induction machine is used. The simulations are carried out in Matlab/Simulink.

KEYWORDS:

  1. MPPT
  2. DTC
  3. PV pumping
  4. Photovoltaic
  5. Three phase induction motor
  6. Induction machine (IM)
  7. Voltage inverter
  8. Pulse width modulation (PWM)

 SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

 

Fig. 1. System block diagram

EXPECTED SIMULATION RESULTS:

 Fig. 2. Band hysteresis of flux

Fig. 3. Statoric Flux evolution

Fig. 4. Electromagnetic Torque

Fig. 5. Stator current dq Axis

Fig. 6. The motor speed

CONCLUSION:

In this paper, a case study of stand-alone PV pumping system designed for irrigation needs in a remote site in Tunisia. The sizing method for the structure was presented. MPPT technique was used to optimize the power delivered by the photovoltaic module. Direct torque control technique served to control the induction machine speed and therefore the flow of the centrifugal pump. The paper presented the system block diagram, the MPPT control algorithm, the DTC block diagram and design. The main objective of this work is to maximize savings in energy consumption by ensuring that pipelines and networks are sized and designed accurately. The use of DTC technique ensures better efficiency of the motor. The experimental results are satisfactory and suggest that the proposed solution can be a reliable option to overcome the lack of electricity at remote locations and rural areas. More reliability test and studies needs to be performed to guarantee its robustness, efficiency and cost effectiveness.

REFERENCES:

[1] “Solar resource maps for Tunisia”, Solargis S.R.O Slovakia, Maps.

[2] Chaabane. M, Ben Djemaa. A. and Kossentini, “A daily and hourly global irradiations in Tunisia extracted from Meteosat Wedax images”, Solar Energy, vol. 57, issue 6, pp. 449-457.

[3] Information obtained from the direction of the bureau of organic farming, CRDA Tozeur.

[4] T. Augustyn. “Energy efficiency and savings in pumping systems, The holistic approach”, Energy Efficiency Convention (SAEEC), 2012 Southern African.

[5] Jim McGovern, “Technical Note: Friction Factor Diagrams for Pipe Flow”, Dublin Institute of Technology, 2011.

Grid Interactive Bidirectional Solar PV Array FedWater Pumping System

ABSTRACT:

 This paper proposes a grid interactive bidirectional solar water pumping system using a three phase induction motor drive (IMD). A single phase voltage source converter (VSC) is used to direct the flow of power from grid supply to the pump and back to the grid from SPV array. A boost converter is used for the maximum power point tracking (MPPT) of the SPV array. A smart power sharing control is proposed, with preference given to the power from SPV array over the grid power. Moreover, the grid input power quality is also improved. Various modes of operation of the pump are elaborated and the performance of the system at starting, in steady state and dynamic conditions are simulated. The simulated results show the novelty and the satisfactory performance of the system.

KEYWORDS:

  1. Solar water pump
  2. MPPT
  3. Grid interactive
  4. Smart power sharing

 SOFTWARE: MATLAB/SIMULINK

 CIRCUIT DIAGRAM:

Fig. 1. Configuration for the single phase grid interactive SPV water

pumping system

EXPECTED SIMULATION RESULTS:

 Fig. 2(a) Starting performance of the proposed system in mode I

Fig. 3(b) Steady state performance of the proposed system in mode I

Fig. 4(c) Performance of the system in mode I under decreasing radiation

from 800 W/m2 to 500 W/m2

Fig. 5(d) Performance of the system in mode I under increasing radiation

from 500 W/m2 to 800 W/m2

Fig. 6(a) Starting performance of the system in mode II

Fig. 7(b) Steady state performance of the system in mode II

 

Fig. 8(a) Characteristics of the system in mode III with decrease in

Radiation

Fig. 9(b) Characteristics of the system in mode III with increase in

Radiation

Fig. 10(a) Characteristics of the system in mode IV with increase in

Radiation

Fig. 11 (b) Characteristics of the system in mode III with decrease in

radiation

 CONCLUSION:

A single phase grid interactive solar water pumping is presented in the paper. Various modes of operation are identified and simulated in MATLAB Simulink environment. The simulated results have demonstrated the satisfactory performance of the system at starting, and in steady and dynamic conditions. The proposed system not only is able to share the power between two sources but it also improves the quality of power drawn. Moreover, the system manages to feed the power from the SPV array as in when required. The system is well suited for the rural and agricultural usage.

REFERENCES:

[1] J. Zhu, “Application of Renewable Energy,” in Optimization of Power System Operation, Wiley-IEEE Press, 2015, p. 664.

[2] Z. Ying, M. Liao, X. Yang, C. Han, J. Li, J. Li, Y. Li, P. Gao, and J. Ye, “High-Performance Black Multicrystalline Silicon Solar Cells by a Highly Simplified Metal-Catalyzed Chemical Etching Method,” IEEE J. Photovolt., vol. PP, no. 99, pp. 1–06, 2016.

[3] M. Steiner, G. Siefer, T. Schmidt, M. Wiesenfarth, F. Dimroth, and A. W. Bett, “43% Sunlight to Electricity Conversion Efficiency Using CPV,” IEEE J. Photovolt., vol. PP, no. 99, pp. 1–5, 2016.

[4] M. Kolhe, J. C. Joshi, and D. P. Kothari, “Performance analysis of a directly coupled photovoltaic water-pumping system,” IEEE Trans. Energy Convers., vol. 19, no. 3, pp. 613–618, Sep. 2004.

[5] S. R. Bhat, A. Pittet, and B. S. Sonde, “Performance Optimization of Induction Motor-Pump System Using Photovoltaic Energy Source,” IEEE Trans. Ind. Appl., vol. IA-23, no. 6, pp. 995–1000, Nov. 1987.

Solar Powered Based Water Pumping System Using Perturb and Observation MPPT Technique

ABSTRACT:

This paper concentrates on solar photovoltaic(PV) water pumping system using perturb and observation maximum power point tracking(MPPT) technique. This whole system is divided into two stages. In the first stage, an arrangement of PV modules is made which is a combination of number PV cells in series or parallel to extract the solar energy and convert into electricity. To maximize the power output of PV module, perturb and observation (P&O) MPPT technique has been used. In its second stage, direct torque and flux control(DTFC) with space vector modulation(SVM) is used to control switching pulses of the voltage source inverter(VSI). The speed of induction motor drive is controlled by DTFC technique. The whole system is developed in MATLAB and outputs are observed.

 KEYWORDS:

  1. Solar PV array
  2. MPPT
  3. P&O Algorithm
  4. DC-DC Boost converter
  5. DTFC-SVM
  6. Induction motor

 SOFTWARE: MATLAB/SIMULINK

 BLOCK DIAGRAM:

 Fig-1: Solar Water Pumping System

EXPECTED SIMULATION RESULTS:

Fig. 2. DC link voltage (output voltage of the boost converter)

Fig. 3. output waveform of IMD under no load

Fig. 4. Waveforms under loading condition

CONCLUSION:

In this paper control methods which regulates the flow rate of water supply of solar powered based water pumping systen using IMD is illustrated. From the simulation results it can be concluded that this system has good performance. As per view of irrigation system , the SPV array has been operated under standard enviromental conditions. The system is operated on maximum power by using P&O MPPT algorithm. Water flow rate and stator current of motor is controlled by the speed PI controller.

 REFERENCES:

 [1] U. Sharma, S. Kumar, and B. Singh, “Solar array fed water pumping system using induction motor drive,” 1st IEEE Int. Conf. Power Electron. Intell. Control Energy Syst. ICPEICES 2016, 2017.

[2] M. A. G. De Brito, L. P. Sampaio, L. G. Jr, G. A. Melo, and C. A. Canesin, “Comparative Analysis of MPPT Techniques for PV Applications,” pp. 99–104, 2011.

[3] D. P. Hohm, “Comparative Study of Maximum Power Point Tracking Algorithms Using an Experimental, Programmable, Maximum Power Point Tracking Test Bed,” 2000.

[4] S. Member, “A Comparative study of different MPPT techniques using different dc-dc converters in a standalone PV system,” pp. 1690–1695, 2016.

[5] Z. Ben Mahmoud, M. Ramouda, and A. Khedher, “A Comparative Study of Four Widely-Adopted MPPT Techniques for PV Power Systems,” no. 1, pp. 16–18, 2016.

A Fuzzy Logic Control Method for MPPT of PV Systems

ABSTRACT:  

Maximum power point trackers are so important in photovoltaic systems to increase their efficiency. Many methods have been proposed to achieve the maximum power that the PV modules are capable of producing under different weather conditions. This paper proposed an intelligent method for maximum power point tracking based on fuzzy logic controller.  The system consists of a photovoltaic solar module connected to a DC-DC Buck-boost converter. The system has been experienced under disturbance in the photovoltaic temperature and irradiation level. The simulation results show that the proposed maximum power tracker could track the maximum power accurately and successfully in all condition tested. Comparison of different performance parameters such as: tracking efficiency and response time of the system shows that the proposed method gives higher efficiency and better performance than the conventional perturbation and observation method.

 SOFTWARE: MATLAB/SIMULINK

 CIRCUIT DIAGRAM:

Fig. 1: System used for simulation.

 EXPECTED SIMULATION RESULTS:

 Fig. 2: case 1: changing the solar radiation

Fig. 3: Case 1: performance of FLC method

Fig. 4: Case I: performance of P&O method

Fig, 5: Case 2: changing the solar radiation

Fig, 6: Case 2: performance of FLC method

Fig, 7: Case 2: performance of P&O method

Fig, 8: Changing the temperature

Fig, 9: Performance of FLC method

Fig, 10: Performance of P&O method

CONCLUSION:

 Photovoltaic model using Matlab/STMULTNK and design of appropriate DC-DC buck-boost converter with a maximum power point tracking facility are presented in this paper. A new method for MPPT based fuzzy logic controller is presented and compared with the conventional P&O MPPT method. The models are tested under disturbance in both solar radiation and photovoltaic temperature. Simulation results show that the proposed method effectively tracks the maximum power point under different ambient conditions.The oscillation around MPP is decreased and the response is faster in compared with the conventional methods. Comparing the tracking efficiency of both methods indicates that the proposed method has a higher efficiency than the conventional P&O MPPT method.

 REFERENCES:

[1] Jancarle L. Dos Santos, Fernando L. M. Antunes and Anis Chehab, “A Maximum Power Point Tracker for PV Systems Using a High Performance Boost Converter”, Solar Energy, Issue 7, Vol. 80, pp. 772- 778,2005.

[2] Ting-Chung Yu and Tang-Shiuan Chien, “Analysis and Simulation of Characteristics and Maximum Power Point Tracking for Photovoltaic Systems”, Conference,P prpo.c 1e3ed3i9n g- s1 3o4f4 ,PT aoiwpeeri, 2E0l0e9c.t ronics and Drive Systems

[3] Roberto Faranda, Sonia Leva, “Energy Comparison of MPPT techniques for PV Systems”, Wseas Transctions on Power System, Issue 6, Vol. 3, pp. 446-455, June 2008.

[4] D. P. Hohm and M. E. Ropp, “Comparative Study of Maximum Power Point Tracking Algorithms using an experimental, programmable, maximum power point tracking test bed”,P roceedings of Photovoltaic Specialists Conference ,pp. 1699 – 1702, USA,2000.

[5] Trishan Esram and Patrick 1. Chapman, “Comparison of Photovoltaic Array Maximum Power Point Tracking Techniques”, Energy ConverSion, Issue 2, Vol. 22, pp. 439 – 449, May 2007.

A Direct Maximum Power Point Tracking Method for Single-Phase Grid Connected PV Inverters

ABSTRACT:

A direct maximum power point tracking (MP PT) strategy for P V frameworks has been proposed in this work. This strategy unravels two of the primary disadvantages of the Perturb and Observe (P&O) MP PT, in particular: I) the trade off between the speed and the motions in relentless state, ii) the poor viability in unique conditions, particularly in low i r radiance when the estimation of signs turns out to be progressively touchy to clamor.

MP PT

The proposed MP PT is intended for single-stage single-arrange matrix associated P V invert er s and depends on evaluating the swell of the quick P V power and voltage, utilizing a second-arrange summed up integrator-based quadrature flag generator (SO G I-Q S G). We broke down the worldwide soundness of the shut circle control framework and approved the proposed calculation through reenactment and analyses on an invert er test stage as per the EN 50530 standard. The test results affirm the execution of the proposed technique as far as both speed and following effectiveness.

 BLOCK DIAGRAM:

Fig. 1. System configuration of single-stage single-phase grid-connected P V system.

EXPECTED SIMULATION RESULTS:

 

Fig. 2. Experimental P V voltage wave forms after startup showing the convergence to MP P with different 𝐾 values.

 

Fig. 3. Start wave forms comparison for DC link voltage.

Fig. 4. The output P V power under trapezoidal i r radiance profile.

Fig. 5. DC link voltage under trapezoidal i r radiance profile

Fig. 6. Instantaneous efficiency under trapezoidal i r radiance profile.

Fig. 7. Experimental start wave forms of P V power for both methods.

Fig. 8. Experimental start wave forms comparison of DC link voltage.

Fig. 9. Experimental results of P V power under trapezoidal i r radiance profile.

Fig. 10. Experimental results for DC link voltage under trapezoidal i r radiance profile.

Fig. 11. Efficiency under static i r radiance for both methods.

Fig. 12. P V power for P&O under dynamic i r radiance profile according to EN 50530.

Fig. 13. P V power for the proposed method under dynamic i r radiance profile according to EN 50503.

Fig. 14. Efficiency comparison for the both methods from low-to-medium i r radiance

Fig. 15. Efficiency comparison for the both methods from medium-to-high i r radiance.

CONCLUSION:

This paper has depicted the structure of a successful controller for direct achieving the most extreme power point for a solitary stage single-stage lattice associated P V invert er. The proposed technique has been structured dependent on the steadiness examination utilizing the L y a p u n o v quadratic capacity that is framed from the variety of vitality put away in the DC connect capacitor. From the reproductions and trial results on a propelled test stage and as indicated by the EN 50530 standard, it was affirmed that the proposed technique accomplishes high productivity in both static and dynamic conditions. Moreover, the proposed strategy is quick to achieve the MP P.

Permanent Magnet Synchronous Generator Based Wind Energy and DG Hybrid System

ABSTRACT:

This paper examines the utilization of changeless magnet synchronous generators (PMSGs) for a breeze vitality transformation framework (WECS) and a diesel motor driven generator (DG hybrid system) set of an independent cross breed framework with a battery vitality stockpiling framework (BESS). For voltage control at the purpose of normal coupling (PCC) and adjusted supply at terminals of DG hybrid system set, a solitary stage D-Q hypothesis based control calculation is connected for the exchanging of voltage source converter (VSC) of BESS and the greatest power point following (MPPT) is accomplished for WECS with a gradual conductance procedure for the exchanging of a dc-dc help converter. Recreation aftereffects of created model of proposed independent mixture framework, which is produced in MATLAB show execution of both the controllers and power quality enhancement of the half breed framework.

 

 SCHEMATIC DIAGRAM:

 

Fig. 1 Schematic diagram of Wind-Diesel hybrid configuration

 EXPECTED SIMULATION RESULTS:

Fig. 2 (a) Characteristics of the system with constant wind speed under varying loads.

Fig. 3 (b) Estimation of supply currents and voltages using control algorithm

Fig.4 (c) dynamic Performance of controller of hybrid system under varying linear loads at 10 m/s wind speed

Fig. 5(a) Characteristics of the system with constant wind speed under varying loads.

Fig. 6(b) Estimation of supply currents and voltages using control algorithm

Fig.7(c) dynamic Performance of controller of hybrid system under varying nonlinear loads at 10 m/s wind speed.

Fig. 8 waveforms and harmonic spectra (a) Phase ‘a’ supply voltage of at PCC (b) Phase ‘a’ supply current under nonlinear unbalanced loads.

Fig. 9 Controllers’ performance under wind speed reduction (11 m/s-8 m/s)

Fig. 10  Controllers’ performance under rise in wind speed (8 m/s-11 m/s)

 CONCLUSION:

A 3-φ independent breeze diesel half breed framework utilizing PMSG alongside BESS has been recreated in MATLAB utilizing Simpower framework tool compartments. Different parts have been intended for the cross breed framework and controller’s acceptable execution has been delineated utilizing 1-φ-D-Q hypothesis with SOGI channels for different loads under unique conditions while keeping up consistent voltage at PCC and adjusted source flows of diesel generator and furthermore for music concealment according to rules of IEEE-519-1992 standard. A mechanical sensor less methodology has been utilized for accomplishing MPPT through gradual conductance procedure.

 

A Fuzzy Logic Control Method for MPPT of PV Systems

ABSTRACT:

Maximum power point trackers are so important in photovoltaic systems to increase their efficiency. Many methods have been proposed to achieve the maximum power that the PV modules are capable of producing under different weather conditions. This paper proposed an intelligent method for maximum power point tracking based on fuzzy logic controller. The system consists of a photovoltaic solar module connected to a DC-DC Buck-boost converter. The system has been experienced under disturbance in the photovoltaic temperature and irradiation level. The simulation results show that the proposed maximum power tracker could track the maximum power accurately and successfully in all condition tested. Comparison of different performance parameters such as: tracking efficiency and response time of the system shows that the proposed method gives higher efficiency and better performance than the conventional perturbation and observation method.

 SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

Fig. 1. Block diagram of the stand-alone PV system

EXPECTED SIMULATION RESULTS:

Fig. 2: case 1: changing the solar radiation

Fig. 3: Case 1: performance of FLC method

 

Fig. 4: Case I: performance of P&O method

Fig, 5: Case 2: changing the solar radiation

Fig, 6: Case 2: performance of FLC method

Fig, 7: Case 2: performance of P&O method

Fig, 8: Changing the temperature

Fig, 9: Performance of FLC method

Fig, 10: Performance of P&O method

 CONCLUSION:

 Photovoltaic model using Matlab/STMULTNK and design of appropriate DC-DC buck-boost converter with a maximum power point tracking facility are presented in this paper. A new method for MPPT based fuzzy logic controller is presented and compared with the conventional P&O MPPT method. The models are tested under disturbance in both solar radiation and photovoltaic temperature. Simulation results show that the proposed method effectively tracks the maximum power point under different ambient conditions. The oscillation around MPP is decreased and the response is faster in compared with the conventional methods. Comparing the tracking efficiency of both methods indicates that the proposed method has a higher efficiency than the conventional P&O MPPT method.

 REFERENCES:

[1] Jancarle L. Dos Santos, Fernando L. M. Antunes and Anis Chehab, “A Maximum Power Point Tracker for PV Systems Using a High Performance Boost Converter”, Solar Energy, Issue 7, Vol. 80, pp. 772- 778,2005.

[2] Ting-Chung Yu and Tang-Shiuan Chien, “Analysis and Simulation of Characteristics and Maximum Power Point Tracking for Photovoltaic Systems”, Conference,P prpo.c 1e3ed3i9n g- s1 3o4f4 ,PT aoiwpeeri, 2E0l0e9c.t ronics and Drive Systems

[3] Roberto Faranda, Sonia Leva, “Energy Comparison of MPPT techniques for PV Systems”, Wseas Transctions on Power System, Issue 6, Vol. 3, pp. 446-455, June 2008.

[4] D. P. Hohm and M. E. Ropp, “Comparative Study of Maximum Power Point Tracking Algorithms using an experimental, programmable, maximum power point tracking test bed”,P roceedings of Photovoltaic Specialists Conference ,pp. 1699 – 1702, USA,2000.

[5] Trishan Esram and Patrick 1. Chapman, “Comparison of Photovoltaic Array Maximum Power Point Tracking Techniques”, Energy ConverSion, Issue 2, Vol. 22, pp. 439 – 449, May 2007.

Design and Performance Analysis of Three-Phase Solar PV Integrated UPQC

IEEE Transactions on Industry Applications, 2017 IEEE

ABSTRACT: This paper deals with the design and performance analysis of a three-phase single stage solar photovoltaic integrated unified power quality conditioner (PV-UPQC). The PV-UPQC consists of a shunt and series connected voltage compensators connected back to back with common DC-link.The shunt compensator performs the dual function of extracting power from PV array apart from compensating for load current harmonics. An improved synchronous reference frame control based on moving average filter is used for extraction of load active current component for improved performance of the PVUPQC. The series compensator compensates for the grid side power quality problems such as grid voltage sags/swells. The compensator injects voltage in-phase/out of phase with point of common coupling (PCC) voltage during sag and swell conditions respectively. The proposed system combines both the benefits of clean energy generation along with improving power quality. The steady state and dynamic performance of the system are evaluated by simulating in Matlab-Simulink under a nonlinear load. The system performance is then verified using a scaled down laboratory prototype under a number of disturbances such as load unbalancing, PCC voltage sags/swells and irradiation variation.

KEYWORDS:

  1. Power Quality
  2. Shunt compensator
  3. Series compensator
  4. UPQC
  5. Solar PV
  6. MPPT

SOFTWARE: MATLAB/SIMULINK

CIRCUIT DIAGRAM:

Fig. 1. System Configuration PV-UPQC

EXPECTED SIMULATION RESULTS:

 

Fig. 2. Performance of PV-UPQC under Voltage Sag and Swell Conditions

Fig. 3. Performance PV-UPQC during Load Unbalance Condition

Fig. 4. Performance PV-UPQC at Varying Irradiation Condition

Fig. 5. Load Current Harmonic Spectrum and THD

Fig. 6. Grid Current Harmonic Spectrum and THD

CONCLUSION:

The design and dynamic performance of three-phase PVUPQC have been analyzed under conditions of variable irradiation and grid voltage sags/swells. The performance of the system has been validated through experimentation on scaled down laboratory prototype. It is observed that PVUPQC mitigates the harmonics caused by nonlinear load and maintains the THD of grid current under limits of IEEE-519 standard. The system is found to be stable under variation of irradiation, voltage sags/swell and load unbalance. The performance of d-q control particularly in load unbalanced condition has been improved through the use of moving average filter. It can be seen that PV-UPQC is a good solution for modern distribution system by integrating distributed generation with power quality improvement.

REFERENCES:

[1] B. Mountain and P. Szuster, “Solar, solar everywhere: Opportunities and challenges for australia’s rooftop pv systems,” IEEE Power and Energy Magazine, vol. 13, no. 4, pp. 53–60, July 2015.

[2] A. R. Malekpour, A. Pahwa, A. Malekpour, and B. Natarajan, “Hierarchical architecture for integration of rooftop pv in smart distribution systems,” IEEE Transactions on Smart Grid, vol. PP, no. 99, pp. 1–1, 2017.

[3] Y. Yang, P. Enjeti, F. Blaabjerg, and H. Wang, “Wide-scale adoption of photovoltaic energy: Grid code modifications are explored in the distribution grid,” IEEE Ind. Appl. Mag., vol. 21, no. 5, pp. 21–31, Sept 2015.

[4] M. J. E. Alam, K. M. Muttaqi, and D. Sutanto, “An approach for online assessment of rooftop solar pv impacts on low-voltage distribution networks,” IEEE Transactions on Sustainable Energy, vol. 5, no. 2, pp.663–672, April 2014.

[5] J. Jayachandran and R. M. Sachithanandam, “Neural network-based control algorithm for DSTATCOM under nonideal source voltage and varying load conditions,” Canadian Journal of Electrical and Computer Engineering, vol. 38, no. 4, pp. 307–317, Fall 2015.

Design and Performance Analysis of Three-Phase Solar PV Integrated UPQC

2016 IEEE

ABSTRACT: In this paper, the design and performance of a threephase solar PV (photovoltaic) integrated UPQC (PV-UPQC) are presented. The proposed system combines both the benefits of distributed generation and active power filtering. The shunt compensator of the PV-UPQC compensates for the load current harmonics and reactive power. The shunt compensator is also extracting maximum power from solar PV array by operating it at its maximum power point (MPP). The series compensator compensates for the grid side power quality problems such as grid voltage sags/swells by injecting appropriate voltage in phase with the grid voltage. The dynamic performance of the proposed system is simulated in Matlab-Simulink under a nonlinear load consisting of a bridge rectifier with voltage-fed load.

KEYWORDS:

  1. Power Quality
  2. DSTATCOM
  3. DVR
  4. UPQC
  5. Solar PV
  6. MPPT

SOFTWARE: MATLAB/SIMULINK

 CIRCUIT DIAGRAM:

Fig. 1. System Configuration PV-UPQC

EXPECTED SIMULATION RESULTS:

 Fig. 2. Performance PV-UPQC at steady state condition

Fig. 3. PCC Voltage Harmonic Spectrum and THD

Fig. 4. Load Voltage Harmonic Spectrum and THD

Fig. 5. Load Current Harmonic Spectrum and THD

Fig. 6. Grid Current Harmonic Spectrum and THD

Fig. 7. Performance PV-UPQC at varying irradiation condition

Fig. 8. Performance of PV-UPQC under voltage sag and swell conditions

CONCLUSION:

The dynamic performance of three-phase PV-UPQC has been analyzed under conditions of variable irradiation and grid voltage sags/swells. It is observed that PV-UPQC mitigates the harmonics caused by nonlinear and maintains the THD of grid voltage, load voltage and grid current under limits of IEEE-519 standard. The system is found to be stable under variation of irradiation from 1000𝑊/𝑚2 to 600𝑊/𝑚2. It can be seen that PV-UPQC is a good solution for modern distribution system by integrating distributed generation with power quality improvement.

REFERENCES:

[1] Y. Yang, P. Enjeti, F. Blaabjerg, and H. Wang, “Wide-scale adoption of photovoltaic energy: Grid code modifications are explored in the distribution grid,” IEEE Ind. Appl. Mag., vol. 21, no. 5, pp. 21–31, Sept 2015.

[2] B. Singh, A. Chandra and K. A. Haddad, Power Quality: Problems and Mitigation Techniques. London: Wiley, 2015.

[3] M. Bollen and I. Guo, Signal Processing of Power Quality Disturbances. Hoboken: Johm Wiley, 2006.

[4] P. Jayaprakash, B. Singh, D. Kothari, A. Chandra, and K. Al-Haddad, “Control of reduced-rating dynamic voltage restorer with a battery energy storage system,” IEEE Trans. Ind. Appl., vol. 50, no. 2, pp. 1295– 1303, March 2014.

[5] M. Badoni, A. Singh, and B. Singh, “Variable forgetting factor recursive least square control algorithm for DSTATCOM,” IEEE Trans. Power Del., vol. 30, no. 5, pp. 2353–2361, Oct 2015.