A Novel STATCOM control scheme for grid connected wind driven Induction Generator for Power Quality Improvement

PI & FUZZY CONTROL BASED FACTS DEVICE FOR POWER QUALITY IMPROVEMENT OF WIND ENERGY SYSTEM

Under Esteemed Guidance of B.RAJESH M.Tech Assistant Professor EEE Dept. ByS.MANJU Roll No: 10521D5609 ContentsIntroductionPower qualitySTATCOMConclusionReferences

Introduction: Electric power quality have become more increasingly important and plays an essential role in power system planning. Electric energy transfer must not be interrupted and at the same time there must provide reliable, stable and high quality of electric power.In this project, we had shown the power quality improvement using STATCOM.

Power Quality: Any power problem that results in failure or mis-operation of customer equipment, manifests itself as an economic burden to the user, or produces negative impacts on the environment.Main Power quality problems:Voltage Sags or DipsVoltage SwellsHarmonic DistortionPower FactorSolutions to Power Quality Problems :Lightening and Surge arresters

Thyristor Based Static Switches

Energy Storage Systems

Electronic Tap Changing Transformers

Harmonic Filters

Constant Voltage Transformers FACTS: Applications of FACTS-Devices:Power flow control Increase of transmission capability Voltage control Reactive power compensation Stability improvement Power quality improvement

Devices used in FACTS:Distribution static compensator(DSTATCOM)

Static compensator(STATCOM)

Dynamic voltage restorer(DVR)

Unified power quality conditioner(UPQC)Grid connected Wind Energy System:

Proposed STATCOM control scheme for grid connected wind energy generation for power quality improvement Wind Energy :The terms wind energy or wind power describe the process by which the wind is used to generate mechanical power or electricity. Wind turbines convert the kinetic energy in the wind into mechanical power. Mechanical power can be used for specific tasks (such as grinding grain or pumping water) or a generator can convert this mechanical power into electricity.9Grid connected wind energy system without compensator:

simulation diagram of grid connected wind energy system

Out put wave forms:

System response in absence of compensator (a)Source current (b) Load current (c) Compensating current (d) Induction generator currentTHD for a circuit without compensator:

FFT Analysis of Phase-A Source Current for Balanced Non-Linear Load, here we get 27.77%.Grid connected wind energy system using STATCOM:

Simulation diagram of a system using STATCOM Out put wave forms:

Out put wave forms of source and load currents when STATCOM is in off condition from 0 0.1 after the 0.1 time STATCOM is in operating conditionPower factor for Non- linear Load:After compensation power factor is unity

15THD for a circuit with STATCOM:

FFT Analysis of Phase-A Source Current for Balanced Non-Linear Load, here we get 2.53%.Main Objective of this project:Power factor correction

Voltage regulation

Harmonic filtering in distribution systems.

Power quality improvement by using STATCOM

Grid connected wind energy system with Fuzzy control based STATCOM:

Simulation diagram of a system with fuzzy control based STATCOMOut put wave forms of source and load currents when STATCOM is in off condition from 0 0.1 after the 0.1 time FUZZY based STATCOM is in operating condition

Out put wave forms:THD for a circuit with Fuzzy based STATCOM:

FFT analysis of the source current using the fuzzy controller, we get 0.40%.THD for a circuit with PI&Fuzzy based STATCOM :

FFT analysis of the source current using the PI&Fuzzy controller, we get 0.17%.Conclusion:This project presents the FUZZY control based STATCOM scheme for reactive power compensation and harmonic reduction in grid connected wind generating system feeding non linear load. The control system for the STATCOM is simulated using soft ware MAT LAB/SIMULINK. The proposed control scheme has improved the power quality requirement of a low voltage grid connected wind driven IG system feeding a non-linear load.

References:[I] 1. 0 .Q. Tande 'Applying Power Quality Characteristics of wind turbine for Assessing impact on Voltage Quality', Wind Energy, pp 52, 2002.[2] Z. Chen, E. Spooner, 'Grid Power Quality with Variable Speed Wind Turbines', IEEE Trans on Energy Conversion, Vol. 16, No .2, pp 148- 154, June 200 I.[3] L. H. Hansen, L. Helle, F. Blaabjerg, E. Ritchie, S. Munk-Nielsen, H. Binder, P. S0rensen and B. Bak - Jensen "Conceptual Survey of Generators and Power Electronics for Wind Turbines ", Ris0 National Laboratory, Roskilde, Denmark, December 200l.