Abstract
This paper presents an investigation on a voltage and frequency controller (VFC), which functions as an improved elec-tronic load controller (IELC) for parallel operated isolated asynchronous generators (IAGs) in an autonomous hydro power generation system. In such type of hydro scheme whole generating system is isolated from the grid and supply electricity to the remote communities. The single point operation of these generators is realized, in such a manner that excitation capacitors, speeds, load, voltage, currents of generators remain constant under various operating conditions. The proposed controller consists of a 3-leg IGBT (Insulated Gate Bipolar Transistor) based voltage source converter (VSC) and a DC chopper with an auxiliary load at the DC bus of the VSC. The IELC controls the reactive and active powers simultaneously for controlling the voltage and frequency under varying consumer loads. Along with voltage and frequency control through single point operation of IAGs driven by uncontrolled pico hydro turbines, the IELC meets the power quality standard an IEEE-519 and it keeps the total harmonic distortion (THD) of the terminal voltage and currents within the limit of 5%. Here the proposed electrical system along with its controller is modeled in MATLAB along with Simulink and PSB (Power System Block-set) toolboxes. Simulation results are presented to demonstrate the capability of proposed controller for an isolated generating system.
Highlights
Located villages, islands, military areas, ships etc are some of the areas which are mainly isolated from the power system grid and require stand alone generating system
This paper presents an investigation on a voltage and frequency controller (VFC), which functions as an improved electronic load controller (IELC) for parallel operated isolated asynchronous generators (IAGs) in an autonomous hydro power generation system
Along with voltage and frequency control through single point operation of IAGs driven by uncontrolled pico hydro turbines, the IELC meets the power quality standard an IEEE-519 and it keeps the total harmonic distortion (THD) of the terminal voltage and currents within the limit of 5%
Summary
Islands, military areas, ships etc are some of the areas which are mainly isolated from the power system grid and require stand alone generating system. This paper deals with a voltage and frequency controller for parallel operated isolated asynchronous generators in constant power applications driven by uncontrolled pico hydro turbines. The study of such a system is relevant to full fill the increased load demand and the parallel operation of IAGs is more effective than other electrical generators because of no need of synchronization, and no problem due to hunting. Analysis [15-18] and voltage regulation [19,20] of parallel operated IAGs. here an attempt is made to investigate a voltage and frequency controller for parallel operated IAGs driven by uncontrolled pico hydro turbines
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