Utility Voltage Regulator using AC – DC – AC Converter Topology for Single-Phase Resistive Load Applications
Abstract
This paper focuses on utility voltage regulator using ac – dc – ac converter topology for single-phase resistive load applications. The power circuit converter has been presented, to solve the problem of undesired voltage supply to domestic and industrial equipment. The utility voltage regulator is commonly used in applications that require, the conversion of an AC fluctuating input voltage to maintain a constant AC output voltage value. Its main features are: high reduction in weight and volume, portable, noiseless, simple control strategy, and connection between input and output enabling the use of utility voltage regulator and bypass switch. The voltage regulator comprises of rectifier and inverter circuits with their descriptions, operations and control are discussed in detail. Single and sine pulse width modulation schemes are adopted as a means of regulating the voltage transformations. The ac – dc power switches are controlled by proportional integral (PI) using voltage closed loop feedback. In the proposed topology, simulations have been conducted using computer aided software package MATLAB/SIMULINK 2007(b) to verify its operations. A 1 kVA prototype of the transformerless type has been built and tested in the laboratory to validate the system performance. The performance of the rated prototype is evaluated and the result yielded 91.0% efficiency, 3.06% THD, reduced power losses due to less number of power electronic components count.
Keywords
AC-DC-AC converter, Single-phase, Single and Sine PWM, Utility voltage regulator (UVR)
Supporting Institution
University of Nigeria, Nsukka, Enugu State Nigeria & Michael Okpara University of Agriculture, Umudike Abia State Nigeria
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