Zig-zag transformer based electronic load controller for an isolated asynchronous generator

This paper deals with an electronic load controller (ELC) for a stand alone pico hydro power generating system employing an isolated asynchronous generator (IAG). The proposed controller consists of an electronic load controller (ELC), using two leg IGBT (Insulated Gate Bipolar Junction Transistor) based voltage source converter (VSC), a DC chopper and an auxilliary load at its DC bus. The neutral terminal for the consumer loads is created using a zig-zag transformer. A VSC and a zigzag transformer are connected in shunt with the stator terminals of IAG. The control algorithm of the ELC is developed to control the system voltage and frequency under varying consumer loads. The proposed IAG system is modeled and stimulated in MATLAB using Simulink and PSB toolboxes.