Design of an Efficient Dynamic Voltage Restorer for Compensating Voltage Sags, Swells, and Phase Jumps

ABSTRACT:  

This paper displays a novel plan of a dynamic voltage restorer (DVR) which relieve voltage lists, swell, and stage bounces by infusing least dynamic power in framework and gives the steady power at load side with no unsettling influence. The plan of this remunerating gadget exhibited here incorporates the mix of PWM-based control plot, dq0 change and PI controller in control some portion of its hardware, which empowers it to limit the power rating and to reaction immediately to voltage quality issues looked by the present electrical power businesses.

A colossal information of intensity hardware was connected so as to structure and model of a total test framework exclusively to break down and examining the reaction of this productive DVR. So as to understand this control plan of DVR MAT LAB/SIMULATION climate was utilized. The consequences of proposed structure of DVR’s control plot are contrasted and the aftereffects of existing traditional DVR which obviously exhibit the effective pay of voltage quality issues by infusing least dynamic power.

 

BLOCK DIAGRAM:

 

 Fig.1. Block Diagram of DVR

 EXPECTED SIMULATION RESULTS:

 

Fig.2.Source Voltage with Sag of 0.5 p.u.

Fig.3.Load Voltage after Compensation through proposed DVR

Fig.4. Load Voltage after Compensation through classical DVR

Fig.5. Voltage injected by proposed DVR as response of Sag

Fig.6.Source Voltage with Swell of 1.5 p.u.

Fig.7. Load Voltage after compensation through proposed DVR

Fig.8. Load Voltage after Compensation through classical DVR

Fig.9. Voltage injected by DVR as response of Swell

Fig.10. .Load Voltage after Compensation of Phase jump

Fig.11. dq0 form of difference voltage obtained by proposed DVR

Fig.12. dq0 form of difference voltage obtained by classical DVR

CONCLUSION:

As the world is moving towards modernization, the most fundamental need that it has is of a proficient and dependable intensity of superb quality. These days, an ever increasing number of refined gadgets are being presented, and their affect-ability is needy upon the nature of information control, even a slight unsettling influence in power quality, for example, Voltage lists, voltage swells, and sounds, which keeps going in several milliseconds, can result in an immense misfortune due to the disappointment of end use hardware.

For providing food such voltage quality issues a proficient DVR is proposed in this paper with the ability of moderating voltage hangs, swells, and stage hops by infusing least dynamic power henceforth diminishing the VA rating of DVR. remuneration of voltage quality issues utilizing a similarly low voltage DC battery and by infusing least dynamic power.

 

An Enhanced Voltage Sag Compensation Scheme for Dynamic Voltage Restorer

ABSTRACT:  

This paper manages enhancing the voltage nature of touchy burdens from voltage droops utilizing dynamic voltage restorer (DVR). The higher dynamic power necessity related with voltage stage hop remuneration has caused a generous ascent in size and cost of dc connect vitality stockpiling arrangement of DVR. The current control procedures either moderate the stage bounce or enhance the usage of dc interface vitality by (I) diminishing the abundancy of infused voltage, or (ii) advancing the dc transport vitality bolster. In this paper, an upgraded list pay procedure is suggested that mitigates the stage bounce in the heap voltage while enhancing the general droop remuneration time. A scientific examination demonstrates that the proposed strategy essentially builds the DVR list bolster time (over half) contrasted and the current stage bounce pay strategies. This upgrade can likewise be viewed as a significant decrease in dc interface capacitor measure for new establishment. The execution of proposed technique is assessed utilizing recreation contemplate lastly, confirmed tentatively on a scaled lab model.

 

CIRCUIT DIAGRAM:

 

 Fig. 1 Basic DVR based system configuration.

 EXPECTED SIMULATION RESULTS:

 

Fig. 2. Simulation results for the proposed sag compensation method for 50% sag depth. (a) PCC voltage, (b) load voltage, (c) DVR voltage, (d) DVR active and reactive power, and (e) dc link voltage.

Fig. 3. Simulation results for the proposed sag compensation method for 23% sag depth. (a) PCC voltage, (b) load voltage, (c) DVR voltage, (d) DVR active and reactive power, and (e) dc link voltage.

 CONCLUSION:

In this paper an upgraded hang remuneration conspire is proposed for capacitor bolstered DVR. The proposed procedure enhances the voltage nature of touchy loads by ensuring them against the lattice voltage droops including the stage bounce. It likewise builds remuneration time by working in least dynamic power mode through a controlled change once the stage bounce is redressed. To show the viability of the proposed technique a scientific correlation is completed with the current stage bounce pay plans. It is demonstrated that pay time can be reached out from 10 to 25 cycles (considering presag infusion as the reference strategy) for the planned furthest reaches of half droop profundity with 450 stage bounce. Further expansion in remuneration time can be accomplished for middle of the road droop profundities. This all-inclusive pay time can be viewed as extensive decrease in dc connect capacitor estimate (for the examined case over half) for the new establishment. The viability of the proposed strategy is assessed through broad recreations in MATLAB/Simulink and approved on a scaled lab model tentatively. The trial results exhibit the plausibility of the proposed stage hop remuneration strategy for viable applications.

 

Transformerless DVR Topology Based on Multilevel Inverter with Reduced Number of Switches

ABSTRACT:

In this paper, a transformerless dynamic voltage restorer (DVR) in light of the staggered inverter is proposed. This staggered inverter utilizes decreased number of switches. Therefore, the proposed DVR has bring down number of switches in correlation with other staggered inverter based DVR topologies. Likewise, it has bring down misfortune and cost because of no requirement for infusion transformers. As reenactment results utilizing Matlab/Simulink programming will appear, the proposed DVR can adjust for voltage lists, swells and glimmers.

  

CIRCUIT DIAGRAM:

Fig. 1. Proposed DVR circuit configuration.

  

EXPECTED SIMULATION RESULTS:

Fig.2 Voltage sag and swell compensation; from top to bottom, source voltage, DVR output voltage before filtering, filtered injection voltage and compensated load voltage.

Fig 3. Voltage flicker compensation; from top to bottom, source voltage, DVR output voltage before filtering, filtered injection voltage and compensated load voltage.

 

CONCLUSION:

In this paper, a transformerless DVR dependent on the staggered inverter was proposed. Because of utilizing this inverter, the proposed DVR has bring down number of switches in examination with other staggered DVR topologies. Working standards and the power circuit of the proposed DVR was clarified. The DVR was displayed and furthermore control and exchanging system was talked about in subtleties. At last, recreation results demonstrated the DVR capacities in remunerating voltage lists, swells and glimmer.

 

Photovoltaic Based Dynamic Voltage Restorer with Energy Conservation Capability using Fuzzy Logic Controller

ABSTRACT:

In this paper, a Photovoltaic based Dynamic Voltage Restorer (PV-DVR) is proposed to deal with profound voltage droops, swells and blackouts on a low voltage single stage private dispersion framework. It can recoup hangs up to 10%, swells up to 190% of its ostensible esteem. Else, it will work as a Uninterruptable Power Supply (UPS) when the utility network neglects to supply. It is likewise intended to diminish the use of utility power, which is produced from atomic and warm power stations. An arrangement infusion transformer is associated in arrangement with the heap while reestablishing voltage droop and swell and it is reconfigured into parallel association utilizing semiconductor switches when it is working in UPS and power saver mode. The utilization of high advance up dc-dc converter with high-voltage gain lessens the size and required power rating of the arrangement infusion transformer. It likewise enhances the dependability of the framework. The Fuzzy Logic (FL)  controller with two data sources keeps up the heap voltage by distinguishing  the voltage varieties through d-q change strategy. Reproduction results have demonstrated the capacity of the proposed DVR  in moderating the voltage list, swell and blackout in a low voltage single stage private appropriation framework.

 

BLOCK DIAGRAM:

 

Fig. 1. Structural block diagram of the proposed system.

 EXPECTED SIMULATION RESULTS:

 

  • (a) Supply Voltage
  • (b) Injected Voltage
  • (c) Load Voltage
  • (d) Load Current

(e) Load voltage THD

Fig. 2. Supply voltage, Injected voltage, Load voltage, Load Current and

Fig. 3. Load Voltage with PI controller

  • (a) PV array output voltage without low power boost converter

(b) PV array output voltage with low power boost converter

Fig. 4. PV array output voltage without and with boost converter

Fig. 5. Output voltage of the high step up DC-DC converter

 CONCLUSION:

This paper proposed another PV based DVR to lessen the vitality utilization from the utility network. The plan of a Dynamic Voltage Restorer (DVR) which consolidates a PV exhibit module with low and high power support converters as a DC voltage source to relieve voltage hangs, swells and blackouts in low voltage single stage conveyance frameworks utilizing FL controller has been introduced. The displaying and reenactment of the proposed PV based DVR utilizing MATLAB simulink has been exhibited. The FL controller uses the blunder motion from the comparator to trigger the switches of an inverter utilizing a sinusoidal PWM conspire. The proposed DVR uses the vitality drawn from the PV cluster and the utility source to charge the battries amid typical task. The put away energies in battery are changed over to a customizable single stage air conditioning voltage for alleviation of voltage list, swell and blackout. The recreation result demonstrates that the PV based DVR with FL controller gives better unique execution in alleviating the voltage varieties. The proposed DVR is worked in:

Reserve Mode: when the PV exhibit voltage is zero and the inverter isn’t dynamic in the circuit to hold the voltage to its ostensible esteem.

Dynamic Mode: when the DVR faculties the list, swell and blackout. DVR responds quick to infuse the required single stage pay voltages.

Sidestep Mode: when DVR is separated and skirted if there should arise an occurrence of support and fix.

Power Saver mode: when the PV cluster with low advance up dc-dc converter yield control is sufficient to deal with the heap.

Further work will incorporate a correlation with research facility investigates a low voltage DVR so as to think about recreation and trial results. The various elements of DVR require further examination.

Performance Improvement of DVR by Control of Reduced-Rating with A Battery Energy Storage

ABSTRACT:

Performance improvement of Voltage infusion strategies for DVRs (Dynamic Voltage Restorers) and working modes are settled in this paper. Utilizing fuzzy logic control DVR with dc link& with Battery Energy Storage System frameworks are worked. Power quality issues for the most part consonant contortion, voltage swell and droop are diminished with DVR utilizing Synchronous Reference Theory (SRF hypothesis) with the assistance of fuzzificaton waveforms are watched.

 

 BLOCK DIAGRAM:

 Fig.1.Block Diagram of DVR

 EXPECTED SIMULATION RESULTS:

Fig.2 Voltage waveforms at common coupling point (PCC) and load during harmonic distortion

Fig.3. the dc voltage injection from Battery energy Storage System connected DVR system at voltage swelling period

 Fig.4. DVR waveforms during voltage sag at time of voltage in phase injection

 Fig.5 Amplitude of load voltages and PCC voltages w.r.t time

 Fig 6.DVR waveforms during harmonic distortion at the time of voltage in phase injection

CONCLUSION:

By applying distinctive voltage infusion conspires the job of DVR has been appeared with a most recent control strategy. The introduction of DVR has been offset with different plans with a decreased rating VSC. For gaining the power of DVR, the reference stack voltages have been resolved with the assistance of unit vectors, for which the blunder of voltage addition is diminished. By utilizing SRF hypothesis the reference DVR voltages have been resolved. At last, the outcome inferred are that the in stage voltage addition with PCC voltage diminishes the DVR rating and yet at its DC transport the vitality source is squandered. battery energy storage system. Performance Improvement of DVR by Control of Reduced-Rating with A Battery Energy Storage.

 

Balanced Voltage Sag Correction Using Dynamic Voltage Restorer Based Fuzzy Polar Controller

ABSTRACT:

Numerous controllers based fluffy rationale have been connected on electric power framework. As often as possible, time reaction of the fluffy controllers is gradually, on the grounds that the quantity of participation capacities are too much. Many research are proposed to limit the quantity of enrollment work, for example, fluffy polar controller technique. By utilizing this strategy, number of enrollment capacity can be limited, so the time reaction of the controller turn out to be quicker. This paper displays the Dynamic Voltage Restorer (DVR) based Fuzzy Polar Controller Method to remunerate adjusted voltage list. Reenactment results demonstrate this proposed technique can repay adjusted voltage hang superior to PI controller.

 

 BLOCK DIAGRAM:


 Fig. 1. Block diagram of DVR

EXPECTED SIMULATION RESULTS:

 Fig. 2. 50% of voltage sags at bus A

Fig. 3. 50% sags correction using DVR based PI Controller

Fig. 4. 50% sags correction using DVR based fuzzy polar controller

 CONCLUSION:

DVR based PI Controller can keep up half voltage hangs at 110 % and 30% voltage droops at 98%. DVR based Fuzzy Polar Controller can keep up half voltage lists at 100 % and 30% voltage lists at 97%. As per the mistake normal everything being equal, are demonstrated that the execution of DVR based Fuzzy Polar Controller superior to DVR based PI Controller. Further investigation for unbalance remedy is being attempted to demonstrate the viability of the proposed controller.

 

Operation and Control of a Dynamic Voltage Restorer Using Transformer Coupled H-Bridge Converters

ABSTRACT:

The dynamic voltage restorer (DVR) as a methods for arrangement remuneration for relieving the impact of voltage lists has turned out to be built up as a favored methodology for enhancing power quality at delicate load areas. In the mean time, the fell staggered kind of intensity converter topology has additionally turned into a workhorse topology in high power applications. This paper exhibits the nitty gritty structure of a shut circle controller to keep up the heap voltage inside adequate dimensions in a DVR utilizing transformer coupled H bridge converters. The paper presents framework task and controller configuration approaches, checked utilizing PC reproductions, and a research center scale exploratory model.

  

BLOCK DIAGRAM:

(b)

Fig. 1 Interconnection schematic of (a) series and (b) shunt compensation configurations

for power quality improvement.

EXPECTED SIMULATION RESULTS:

Fig.2 Simulation results for balanced sag. From top to bottom traces are grid voltage, positive sequence of grid voltage, negative sequence of grid voltage, injected voltage, and load voltage.

Fig 3. Simulation results for unbalanced sag. From top to bottom traces are grid voltage, positive sequence of grid voltage, negative sequence of grid voltage, injected voltage, and load voltage.

 

CONCLUSION:

This paper has exhibited the acknowledgment and control highlights of a DVR utilizing an air conditioner stacked staggered converter with fell H bridge converters. The power circuit engineering has been talked about pursued by a model advancement prompting the controller plan. The framework is displayed in the synchronous reference outline representing positive and negative succession voltage hangs to be alleviated. The multi-circle controller with complex state criticism decoupling is structured with an inward current circle and external voltage circle. The controller highlights strong structure edges, incredible yield impedance, and line direction as outlined utilizing recurrence reaction predications. Point by point numerical reproduction has been completed to check the power circuit activity and control plot. A research facility scale test model was produced that checks the power circuit task and controller execution. Test results demonstrate superb concurrence with advanced reenactments.

Artificial Neural Network (ANN) based Dynamic Voltage Restorer for Improvement of Power Quality

ABSTRACT:

Dynamic Voltage Restorer (DVR) is a custom power gadget utilized as a successful arrangement in shielding touchy burdens from voltage aggravations in power dissemination frameworks. The productivity of the control system, that directs the exchanging of the inverters, decides the DVR effectiveness. Corresponding Integral-Derivative (PID) control is the general method to do that. The power quality rebuilding capacities of this controller are constrained, and it produces critical measure of music – all of which comes from this straight procedure’s application for controlling non-direct DVR. As an answer, this paper proposes an Artificial Neural Network (ANN) based controller for improving rebuilding and sounds concealment abilities of DVR. A point by point examination of Neural Network controller with PID driven controller and Fuzzy rationale driven controller is additionally represented, where the proposed controller exhibited unrivaled execution with a unimportant 13.5% Total Harmonic Distortion.

 

CIRCUIT DIAGRAM:

Fig. 1 Simulation model for sag mitigation with ANN controller.

  

EXPECTED SIMULATION RESULTS:

Fig.2 Three phase sag mitigation based on ANN controlled DVR. (a) Instantaneous voltage at stable condition; (b) Instantantaneous voltage when sag occurs; (c) Voltage required to mitigate voltage sag; (d) Output voltage of the inverter circuit; (e) Generated PWM for inverter; (f) Instantaneous voltage after voltage restoration.

Fig 3. Restored Voltage Using (a) PID controller; (b) Fuzzy controller; (c) ANN controller; (d)THD comparison: the least THD can be seen at ANN based DVR, the range of the harmonics is also truncated by a huge amount by this method.

 

CONCLUSION:

DVRs are a famous decision for upgrading power quality in power frameworks, with a variety of control framework on offer to drive these gadgets. In this paper, utilization of ANN to work DVR for giving preferable execution over existing frameworks to relieve voltage list, swell, and music has been illustrated. Issue articulation and hypothetical foundation, structure of the proposed strategy, preparing system of the ANN utilized have been portrayed in detail. Recreation results demonstrating the DVR execution amid voltage droop have been exhibited. Examination of the proposed technique with the well known PID controller, and nonlinear Fuzzy controller has been completed, where the proposed ANN controller showed up as the best choice to reestablish framework voltage while alleviating THD to the best degree.

DVR with Fuzzy Logic Controller and Photovoltaic for Improving the Operation of wind farm

ABSTRACT:

Wind power is one of the most important kind of renewable energies. Wind farm as a device which receives this energy needs some special conditions to work properly. The most common type of wind turbine is the variable-speed directly connected to the grid. Faults in the power system can originate the disconnection of wind farms. Dynamic voltage restore (DVR) is a custom power device used for eliminating voltage sages and swells which is the result of the faults. This paper presents a simulation model of a 12-pulse DVR using photovoltaic (PV) as a mean of providing an alternative energy source for the DVR. In this study, the design of a fuzzy logic (FL) controlled DVR are presented and extended to perform fast fault detection. A new control method for DVR is proposed by combining FL with a carrier modulated PWM inverter. Simulations were carried out using the MATLAB SIMULINK. The simulation results proved the capability of PV-based DVR in eliminating voltage sag and swell distributed system. Improving the operation of wind farm as a energy generator and stabilizing its voltage is the main result of this work.

 

KEYWORDS:

  1. Renewable energy
  2. Photo-voltaic
  3. Dynamic Voltage Restorer (DVR)
  4. Fuzzy Logic

 

SOFTWARE: MATLAB/SIMULINK

 

BLOCK DIAGRAM:

Fig 1 General system

 

EXPECTED SIMULATION RESULTS:

Fig. 2 supply voltage in swell condition

Fig.3 DVR injection voltage in swell condition

Fig.4 wind farm voltage in swell condition after compensation

Fig.5. supply voltage in sag condition

Fig.6 DVR injection voltage in sag condition

Fig.7 wind farm voltage after compensation

Fig.8. Wind farm current after compensation (in both sag and swell condition)

 

CONCLUSION:

In this paper, A 12-pulse DVR is designed and through using new control method all voltage sags and swells in the circuit is generally compensated. In this case the terminal voltage which is connected to the wind turbine stay constant and despite the voltage instability in network wind generators will be able to remain connected to the network and work in stable condition through using DVR. In this article we could compensate a distribution systems when sag and swell voltages occur in an accurate and controlled way. This controlling method is based on fuzzy control which is simulated by Matlab/Simulink software. Also in this paper to provide a source of DC DVR we have used PV which is a kind of natural energy source. The simulation results confirm all.

 

REFERENCES:

  • G. John and B. Frede, “A detailed comparison of system topologies for Dynamic Voltage Restorers”, 2005 IEEE transaction on Industry Application, Vol .41, 272-1280.
  • Awad, J. Svensson, and M. Bollen, “Mitigation of unbalanced voltage dips using static series compensator” IEEE Trans. Power Electron. vol. 19, pp. 837–846, May 2004.
  • Geza, C. Su and L. Luiz, “Closed Loop state variable control of Dynamic Voltage Restorer with fast 39th IAS Annual Meeting Conference Record of the 2004.

Voltage Sag/Swell Compensation Using Z-source Inverter DVR based on FUZZY Controller

ABSTRACT:

The power quality requirement is one of the major issues for power companies and their customers. The analysis of power disturbance characteristics and finding solution to the power quality problems have resulted in an increased interest for power quality. The most concerning disturbances affecting the quality of the power in the distribution system are voltage sag/swell. The DVR is used to mitigate the voltage sag/swell on sensitive load. In this paper Z-source inverter (ZSI) based DVR is proposed to enhance the voltage restoration property of the system. The ZSI uses an LC impedance grid to couple power source to inverter circuit and prepares the possibility of voltage buck and boost by short circuiting the inverter legs. Additionally a fuzzy logic control scheme for Z-source inverter based DVR is proposed to obtain desired injecting voltage. Modeling and simulation of the proposed DVR is implemented in MATLAB/SIMULINK platform.

 

KEYWORDS

  1. Dynamic voltage restorer
  2. Power quality
  3. Fuzzy controller
  4. Z-source inverter.

 

SOFTWARE: MATLAB/SIMULINK

 

BLOCK DIAGRAM:

Fig. 1 DVR general configuration

 

EXPECTED SIMULATION RESULTS:

Fig.2Three phase voltage at load point during three phase fault without DVR

Fig 3. Three phase voltage by DVR

Fig.4Three phase compensated voltage with DVR

Fig.5comparison of performance of DVR using Z-source inverter during fault condition

Fig.6Three phase voltage at load point during three phase fault with DVR and PI controller

Fig.7Three Phase voltage at load point during three phase fault with DVR and PI and Fuzzy controller

 

CONCLUSION:

DVR serves as an effective custom power device for mitigating voltage sag/swell in the distribution system. In case of external disturbances the proposed DVR injects appropriate voltage component to dynamically correct any deviation in supply voltage in order to maintain balanced and constant load voltage at nominal value. In this paper Z – source inverter based DVR along with fuzzy controller is modeled and the same is installed in the distribution system to provide required load side compensation. The simulation of the DVR along with the proposed controller is carried out using MATLAB/SIMULINK platform. The simulation results shows that the performance of Z – source inverter based DVR along with fuzzy controller is better compared to PI controller.

 

REFERENCES:

  • Lim, P.K, Dorr, D.S., “Understanding and resolving voltage sag related problems for sensitive industrial customers”, Power Engineering Society Winter Meeting, 2000. IEEE, Volume 4, Jan 2000, Page(s):2886-2890.
  • Hingeroni, N.G, “Indroducing custom power”, IEEE Spectrum, 1995, 1, pp. 41-48.
  • H. Woodley, L. Morgan, and A. Sundaram, “Experience with an inverter-based dynamic voltage restorer” , IEEE Trans. Power delivery, vol. 14, pp. 1181-1186, July 1999.
  • Math H. J. Bollen, “Understanding Power Quality Problems” . A volume in the IEEE Press Series On Power Engineering, 2000.
  • Chellali Benachaiba, Brahim Ferdi “voltage quality improvement using DVR” Electrical power quality and utilization, journal vol. XIV, No. 1, 2008.