Modeling, Simulation and Development of Front-End Converter for Power Quality Improvement

Abstract

Harmonics are caused by the loads in which the current waveform does not have sinusoidal shape. These loads are called the nonlinear loads and are the source of harmonic current and voltage distortion. Current harmonics generated by these non- linear loads are propagated throughout the power network. Voltage distortion is the result of these distorted currents passing through the series impedance of the system and results into power quality problems.

Thus various standards are set to limit the harmonics injected by nonlinear loads. IEEE standard 519 was first issued in 1991. It gave the first guidelines for system harmonics limitations and was revised in 1992 IEEE 519-1992 Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems provide the guidelines for determining what are the acceptable limits.

To improve power quality the front-end converter should be used that works at unity power factor at input side with low line current harmonics with nearly sinusoidal shape and maintains constant output voltage irrespective of the various load condition. The performance of the converter system largely depends on the quality of the applied current control strategy. Therefore, current control of PWM converters is very important in high dynamic performance applications. In the current controlled PWM converter, the hysteresis controllers are extensively used due to their simplicity and fast dynamic response.The objective of this project is to design, simulate, and develop the control for the front-end converter using space vector modulation hysteresis current controller for improving the power quality.Design and Development of Voltage and Frequency Regulator for Synchronous Generator in Micro Hydro Power Generation System