Abstract

In order to suppress the zero sequence circulating currents (ZSCCs) between parallel operating three level voltage source inverters with common AC and DC buses, a common mode voltage reduction PWM (CMVR-PWM) technique and neural point potentials (NPPs) control based method is proposed in this paper. An equivalent model of ZSCC is developed, and two excitation sources of ZSCC, differences of common mode voltages (CMVs) and NPPs between paralleled inverters, are analyzed. A CMVR-PWM method is investigated to reduce the CMV, and a simple electric circuit is adopted to control the NPPs. With this two strategies, ZSCCs between parallel inverters can be eliminated effectively. This strategy has the advantage of without carrier synchronization and can be utilized to parallel operating inverters with different types of filter. Simulation result validate the proposed ZSCC elimination schemes.

Highlights

  • In the past few years, renewable energy generation is increasing developed, especially the photovoltaic power generation and wind power generation [1]

  • Three phase voltage source inverter (VSI) is an important equipment for renewable energy sources connecting to utility grid

  • This approach can be effective to eliminate the zero sequence circulating currents (ZSCCs) of three level inverters, and carrier synchronization is not essential

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Summary

INTRODUCTION

In the past few years, renewable energy generation is increasing developed, especially the photovoltaic power generation and wind power generation [1]. For two level inverters, the CMV reduced PWM will cause big harmonic current distortion and carrier synchronization is essential. A modified modulation method with two level SVPWM modulating wave is used to reduce the high-frequency components of ZSCC caused by CMV. This approach can be effective to eliminate the ZSCC of three level inverters, and carrier synchronization is not essential. In order to suppress the ZSCCs of parallel operating three level inverters with common both AC and DC buses, this paper proposes an CMVR-PWM and ZSCC feedback control based method. Syntax Warning: Mismatch between font type and embedded font file synchronization and can be utilized to inverters with different types of filter

MODELING OF ZERO SEQUENCE CIRCULATING CURRENT
STRATEGY OF ZERO SEQUENCE CIRCULATING CURRENT ELIMINATION
CONCLUSION
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