A New Central Control Scheme for Future Micro-Grid Systems Considering Variable Speed Drive Systems and Fuzzy Logic Control System

A New Central Control Scheme for Future Micro-Grid Systems Considering Variable Speed Drive Systems and Fuzzy Logic Control System

Safwan Mhrez Nadweh (Tishreen University, Lattakia, Syria), G. Hayek (Tishreen University, Lattakia, Syria) and Bassam Atieh (Tishreen University, Lattakia, Syria)
Copyright: © 2019 |Pages: 22
DOI: 10.4018/IJEOE.2019040102

Abstract

The increased use of nonlinear loads in power systems have caused problems with the quality of electrical power systems, which affects its performance. One of the most important nonlinear loads is variable speed drive systems (VSDS) which causes issues to the industrial plants power supply. In this article, the authors compare different control methods to apply the bias voltages required to operate transistors in the four-quadrant chopper which added to the dc- link of the variable-speed drive system in order to improve power quality, considering future micro-grid systems. A selection is then made of the appropriate one that improves power quality specifications. This article discusses the issues related to VSDS, such as total harmonic distortion factor THD%; the ripple factor of the DC current and voltage of the VSDS; and its harmful effects on the power system.
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Introduction

According to IEEE Std 1566 - (2015), variable speed drive systems are defined as a correlated set of electronic equipment that provides the means for adjusting the engine's speed and the connected mechanical load.

Many researches have been introduced to improve the performance of VSDs by analyzing the impact of control methods on these systems which improve the power quality on the grid side by eliminating the harmonics and their problems.

Variable Speed Drive Systems Consist of

  • The rectifier.

  • Dc- link.

  • Inverter.

  • Motor.

  • The connected mechanical load.

The Harmonics Amplitude of VSDs is Determined by

  • 1.

    Drive scheme (number of pulses, type of rectifier).

  • 2.

    The percentage of the VSDs capacity to the total the power system's capacity.

  • 3.

    The short circuit power of the feeding system.

  • 4.

    Electrical insulation state for driving system.

  • 5.

    The electrical load of the VSDS.

  • 6.

    Keeping VSDs voltage constant.

This research aims to compare the control strategies which used to ensure the required bias voltage to operate the four-quadrant transistors added to the DC - link of the VSDs and select the best strategy to reach the high-power factor and lower losses during the phase of smoothing.

This work focuses on achieving the basic requirements of the automated operations required for high performance. Both small size and low weight of the drive and control circuits with chopper circuit are very suitable for integration with VSDS. This integration doesn't require major changes in both power and control circuits, and helps chopper to be integrated with any existing system by adding some simple modifications.

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