Decoupled electronic load controller for asynchronous generator in pico-hydro power generation

This paper deals with a decoupled electronic load controller (DELC) for an isolated asynchronous generator (IAG), used in constant power pico hydro power generation for feeding three-phase four-wire loads. The proposed DELC is used to control the voltage and frequency in the decoupled manner. The proposed decoupled electronic load controller is combination of a voltage regulator (VR) for regulating the voltage and a conventional electronic load controller (ELC) for regulating the active power (i.e. frequency). The VR is realized using a star-delta transformer and H-bridge current controlled voltage source converter (VSC) with a capacitor on its dc bus and an ELC is a combination of a three phase diode bridge rectifier with a chopper switch and an auxiliary load. The proposed electronic load controller with the generating system is modeled and simulated in MATLAB along with Simulink and power system blockset (PSB) toolboxes. The simulated results are presented for three-phase four-wire linear/nonlinear loads with the neutral current compensation to demonstrate its performance.