A New Voltage and Frequency Controller for Standalone Parallel Operated Self Excited Induction Generators

Abstract

This work proposes a new voltage and frequency controller (VFC) for standalone parallel operated self excited induction generators driven by uncontrolled micro hydro turbines. This VFC consists of a current controlled static compensator (STATCOM) for regulating the voltage during different load conditions and a variable frequency induction motor drive driving a water pump operating as an electronic load controller (ELC) for balancing the generated power, which in turn regulates the system frequency. The STATCOM functions as a reactive power compensator for regulating the system voltage and an active filter for harmonics elimination. The control algorithm of STATCOM is based on the synchronous reference frame (SRF) theory.