分布式电源用四桥臂变换器中点电压漂移控制

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摘要四桥臂变换器的作用是针对三相不平衡负载或者非线性负载提供三相对称的输出电压,但如果四桥臂中点控制不好将使得输出电压中包含直流成分,进而导致变换器输出电压不对称或者电压幅值发生变化。为解决变换器中点电压漂移而导致变换器输出包含直流成分的问题,本文提出了将分裂式电容与中线串电感有机结合构造了第四桥臂的新结构,建立了第四桥臂的数学模型,并根据第四桥臂的数学模型提出了电压电流双闭环的控制策略,设计了第四桥臂的控制器并对其稳态误差进行了分析,该方法可以解决变换器输出包含直流成分问题,并实现与变换器其他三相主桥臂的解耦控制,PSIM仿真和实验结果表明该方法是切实可行的。

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	张佳佳
	石东源

关键词 ：变换器, 四桥臂, 中点电压漂移, 闭环控制, 分布式电源

Abstract：Four-leg converters are used to supply three-phase balanced voltages under an unbalanced or nonlinear load condition. But if the neutral point of the fourth leg is controlled incorrect, which will make output voltage contain DC component, and cause the output voltage of the four-leg converter asymmetry or the output voltage amplitude change. In order to resolve the problems of DC component caused by the neutral point voltage shift, the new topology structure of the fourth leg which contains the split DC link capacitance and series inductance of neutral line is proposed in this paper, and the mathematical model of the fourth bridge leg is established. Also the voltage and current double closed-loop control strategy is forwarded according to the mathematical model of the fourth bridge leg. At the same time, the controller of the fourth bridge leg is designed, and the steady-state error of the scheme is analyzed too. The control method of the fourth leg proposed in this paper is decoupled from the control of the other three-phase converter, and resolves the problem of DC component caused by the neutral point voltage shift. The feasibility and effectiveness of this control method is verified by PSIM simulation and experimental results.

Key words： Converter four-leg the neutral point voltage shift close-loop control distributed generation

收稿日期: 2011-05-03 出版日期: 2013-11-28

PACS:

TM46

作者简介: 张佳佳女，1973年生，副教授，博士研究生，研究方向为电力电子与电力传动。石东源男，1973年生，副教授，博士，研究方向为微网技术和电力系统自动化。

引用本文:

张佳佳, 石东源. 分布式电源用四桥臂变换器中点电压漂移控制[J]. 电工技术学报, 2013, 28(2): 225-232. Zhang Jiajia, Shi Dongyuan. Control of Neutral Point Voltage Shift for Four-leg Converter in Distributed Generation. Transactions of China Electrotechnical Society, 2013, 28(2): 225-232.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I2/225

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