Static Voltage and Frequency Regulation of Standalone Wind Energy Conversion System

Background/Objective: This paper presents regulation of Self Excited Induction Generator (SEIG) as asynchronous generator in standalone mode for wind energy conversion system (WECS). Methods/Statistical Analysis: The proposed controller consists of Voltage Source Converter (VSC) having bidirectional active & reactive power flow control, integrated with Battery Storage Unit (BSU), connected in shunt. It compensates for variable reactive power with variable active power. Rating of induction machine has been obtained by short circuit test, open circuit test and synchronous speed test. Findings: SEIG have relative advantage over conventional synchronous generator. However, vo1ltage and frequency regulation are among prime challenges in its practical application as standalone generator. Voltage and frequency of SEIG depends upon speed of rotor, shunt capacitor and load. A suitable control scheme needs to be developed to ensure minimum variation in voltage and frequency for variable input and electrical load. Voltage regulation has been achieved by adjusting reactive power provided by static compensator consisting of inductor a VSC and dc bus capacitor. Conclusion/Improvement: The simulation results show that voltage and frequency of SEIG-WECS have negligible variation for resistive, reactive, balanced, unbalanced and nonlinear load under varying wind speed and consumer load. It eliminates harmonic contents and balances the connected electrical load.