Analysis of DC Capacitance Range for Cascaded STATCOM With Large Fluctuation DC Voltage Under Modulation Output Voltage Constraints

被引：0

作者：

Du S. ^{[1
]}

Tan X. ^{[1
]}

Zhou J. ^{[2
]}

机构：

[1] School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo

[2] School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou

来源：

Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Capacitance reduction; Carrier-based PWM; H-bridge cascaded; PWM output constraint; Range of capacitance values; STATCOM;

D O I：

10.13336/j.1003-6520.hve.20190410004

中图分类号：

学科分类号：

摘要：

Thin-film capacitance is required in DC side of H-bridge cascade STATCOM so as to reduce its capacitance which will help improve device's power density. After the voltage stress of the device being taken into consideration, modulation output voltage range is one of the key factors that restrict STATCOM DC bus capacitance. For application in star connection H-bridge cascaded STATCOM, after the fluctuation dc voltage being taken into consideration, the range of capacitance under the modulation output voltage is analyzed. Based on the carrier modulation technology, the analytical relationship of dc capacitance, compensation current and modulation output range is derived. Based on the obtained results, with DC voltage peak value as a constraint, an equation of STATCOM modulated output voltage is established, and the value range of capacitive reactance is also analyzed. Furthermore, the influences of filter reactance on capacitance value and how to set the DC mean voltage reference are discussed. Compared with the traditional capacitance value selection method, the validity of theoretical analysis is verified by simulation and experiments. The analytical conclusion obtained in this paper can provide a theoretical reference for the research on reducing capacitance of STATCOM. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：133 / 143

页数：10

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