The control for grid connected inverter of distributed generation under unbalanced grid voltage

2009 International Conference on Sustainable Power Generation and Supply Pub Date : 2009-04-06 DOI:10.1109/SUPERGEN.2009.5348215

Zhang Guowei, Wei Tongzhen, H. Shengli, Kong Lingzhi

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引用次数: 12

Abstract

This paper describes a new control scheme of grid connected inverter of DG (distributed generation) under unbalanced grid voltage. In this paper, the proposed scheme of synchronous reference frame (SRF) controller can reduce the influence of unbalanced grid voltage, which is mainly caused by unbalanced distribution of single-phase and non-linear loads, etc. In order to realize the control goal, a positive SRF which rotates counterclockwise and a negative SRF which rotates clockwise are used to control the positive sequence current and negative sequence current, separately. According to PF =1 of grid side and average output active power is constant, the positive sequence reference current and negative sequence reference current are obtained. The positive sequence ac link feedback current is derived through a notch filter to eliminate the 100Hz negative sequence in the positive SRF. The same as the negative sequence ac link feedback current. The effectiveness of the proposed scheme has been demonstrated through computer simulation.

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电网电压不平衡条件下分布式发电并网逆变器的控制

本文介绍了电网电压不平衡情况下分布式发电并网逆变器的一种新的控制方案。本文提出的同步参考框架(SRF)控制器方案可以减少电网电压不平衡的影响，而电网电压不平衡主要是由单相和非线性负载分布不平衡等引起的。为了实现控制目标，采用逆时针旋转的正SRF和顺时针旋转的负SRF分别控制正序电流和负序电流。根据电网侧PF =1和平均输出有功功率恒定，得到了正序参考电流和负序参考电流。正序交流链路反馈电流通过陷波滤波器导出，以消除正SRF中的100Hz负序。与负序交流环节反馈电流相同。通过计算机仿真验证了该方案的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2009 International Conference on Sustainable Power Generation and Supply

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