Title: VSC with a T-connected transformer-based electronic load controller for an isolated asynchronous generator feeding three-phase four-wire loads in a micro hydro system

Authors: Gaurav Kumar Kasal, Bhim Singh

Addresses: Department of Electrical Engineering, Indian Institute of Technology, Hauz-Khas, New Delhi-110016, India. ' Department of Electrical Engineering, Indian Institute of Technology, Hauz-Khas, New Delhi-110016, India

Abstract: This paper deals with a novel solid state controller (NSSC) for isolated asynchronous generator (IAG) feeding three-phase four-wire loads driven by constant power prime movers, such as uncontrolled micro hydro turbines. AC capacitor banks are used to meet the reactive power requirement of the asynchronous generator. The proposed NSSC is realised using a set of IGBTs (insulated gate bipolar junction transistors) based current controlled voltage source converter (CC-VSC) and a DC chopper at its DC bus, which keeps the generated voltage and frequency constant in spite of changes in consumer loads. The neutral point of the load is created using a T-configuration of the transformers. The IAG system is modelled in MATLAB along with Simulink and PSB (power system block set) toolboxes. The simulated results are presented to demonstrate the capability of isolated generating system consisting of NSSC and IAG driven by uncontrolled micro hydro turbine and feeding three-phase four-wire loads.

Keywords: standalone power generation; voltage source converters; voltage control; frequency control; T-connected transformers; load control; isolated asynchronous generators; micro hydro turbines; solid state controllers; simulation.

DOI: 10.1504/IJPELEC.2011.042309

International Journal of Power Electronics, 2011 Vol.3 No.5, pp.496 - 509

Published online: 04 Sep 2011 *

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