NEW STATCOM CONTROL SCHEME FOR POWER QUALITY IMPROVEMENT IN WIND FARM.
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This document presents a new control scheme for a static compensator (STATCOM) integrated with a battery energy storage system (BESS) aimed at improving power quality in wind farms. It addresses issues such as voltage variation, harmonics, and reactive power management caused by the intermittent nature of wind energy production. The proposed system effectively enhances voltage regulation and stabilizes the grid by mitigating power quality problems through advanced current injection techniques.
NEW STATCOM CONTROL SCHEME FOR POWER QUALITY IMPROVEMENT IN WIND FARM.
- 1. BY Y. SANNUTHI New STATCOM control scheme for Power Quality improvement in wind farm
- 2. ABSTRACT The influence of the wind turbine in the grid system concerning the power quality measurements are-the active power, reactive power, variation of voltage, flicker, harmonics, and electrical behavior of switching operation and these are measured according to national/international guidelines. This project demonstrates new control scheme for STATIC COMPENSATOR(STATCOM) which is connected at a point of common coupling with a battery energy storage system (BESS) to mitigate the power quality issues.
- 3. INTRODUCTION Renewable energy resources are receiving considerable attention in the continued growth and development of electric power systems, being the wind power production the fastest growing type of renewable energy. During the normal operation, wind turbine produces a continuous variable output power. These power variations are mainly caused by the effect of turbulence, wind shear, and tower-shadow and of control system in the power system.Thus, the network needs to manage for such fluctuations. The STATCOM is shunt connected at the bus where the wind turbine is connected to the power network to provide voltage regulation and improve the short-term transient voltage stability. The STATCOM control schemes are suitably designed and coordinated.
- 4. WIND ENERGY GENERATING SYSTEM FACTS • STATCOM BESS COMPONENTS
- 5. WIND ENERGY GENERATING SYSTEM Non linear loads kinetic Energy Mechanical Energy Electrical Energy wind Wind turbine Induction generator Grid Non- linear load
- 6. POWER QUALITY Power quality mainly deals with, • Continuity of power supply. •“Quality” of the voltage. “POWER QUALITY” maintenance is an important aspect in the economic operation of a system. Various “POWER QUALITY ”problems may leads to another undesirable problems.
- 7. POWER QUALITY ISSUES Wind Turbine Location In Power System Voltage variations Harmonics Flickers
- 8. FACTS – Flexible AC Transmission system. Used to enhance controllability and increase power transfer capability." FACTS
- 9. It is a regulating device used on AC transmission networks. It acts in either capacitive or inductive mode. It is based on a voltage- source converter. STATCOM
- 10. Voltage-Source Converter converts voltage and currents from DC to AC while the exchange of power can be in both direction. From AC to DC (rectifier mode). From DC to AC (inverter mode). Mainly the STATCOM based current control voltage source inverter injects the current into the grid in such a way that the source current are harmonic free and their phase angle with respect to source voltage has a desired value. The injected current will cancel out the reactive part and harmonic part of the load and induction generator current, thus it improves the power factor and the power quality.
- 11. It is used for the purpose of voltage regulation. It can be used to level the power fluctuation by charging and discharging operation. It rapidly injects or absorbed reactive power to stabilize the grid system. BATTERY ENERGY STORAGE SYSTEM(BESS)
- 12. CONTROL SCHEME It is based on injecting the currents into the grid using “Bang-Bang controller.” It gives correct switching signals for STATCOM operation.
- 13. BLOCK DIAGRAM
- 14. POWER NETWORK MODEL OF GRID CONNECTED SYSTEM
- 15. 3PH SOURCE V I RL BRANCH STATCOM BREAKER LOADV I WIND TURBINE ASYN-GEN PF CORRECTION FILTER CONTROLLER GAIN UNIT VECTOR RELAY NOT SIMULATION DIAGRAM
- 16. SIMULATION RESULTS Source voltage wave form Simulation diagram of Source voltage
- 17. Source current waveform It is observed that the Source Current on the Grid is affected due to the effects of Non-Linear load and Wind Generator. Thus purity of waveform may be lost on both sides in the system. Simulation diagram of source current
- 18. Simulation diagram of STATCOM injecting current The compensated current for the Non-Linear load and demanded Reactive Power is provided by the Inverter. The Real Power Transfer from the Batteries is also supported by the Controller of this Inverter. STATCOM injecting current wave form
- 19. Simulation diagram of load current load current waveform WITHOUT STATCOM WITH STATCOM
- 20. Supply Voltage and Current at PCC. The source current with and without STATCOM operation is shown in Fig. The Unity Power factor is maintained for the source Power when the STATCOM is in operation. Simulation diagram of Supply Voltage and Current at PCC WITHOUT STATCOM WITH STATCOM
- 21. THD% at PCC with STATCOM
- 22. The Power Quality issues and its consequences are presented. STATCOM has a capability to cancel out the Harmonic parts of the Load Current. STATCOM maintains the Source Voltage and Current in-Phase and support the Reactive Power demand for the Wind Generator and load at PCC. CONCLUSION