Capacitor Value Selection Analysis and DC Voltage Control for Cascaded H-Bridge STATCOM With Reduced Capacitance Value

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, 454000, Henan Province
[2] School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, Jiangsu Province
来源：
Dianwang Jishu/Power System Technology | 2019年 / 43卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Capacitance value selection analysis; Cascaded STATCOM; DC voltage control; Reduced capacitance value;
D O I：
10.13335/j.1000-3673.pst.2017.2874
中图分类号：
学科分类号：
摘要：
The cascaded H-bridge static synchronous compensator (CHB-STATCOM) with reduced capacitance value adopts thin film capacitor to improve reliability of the device. However, the reduced capacitance value affects peak voltage, and fluctuation voltage in DC side, and inductive current range. The modulation standard and voltage control target on DC side are different from traditional CHB-STATCOM. Therefore, the influence of CHB- STATCOM capacitor value is analyzed and a DC voltage control scheme is proposed. The analytic relationship between the capacitance value and DC side voltage is deduced. Under a certain DC voltage peak, the relationship of the capacitance value with the DC voltage fluctuation and the output inductive current range is obtained with modulation output scope as constraint. Based on this analytical relationship, analysis is carried out. The relationship between the capacitance voltage of the power module and its instantaneous power is also derived. Mathematical models of control system are compared under different controlled variables. DC voltage control variable is selected and a three-level control scheme of DC voltage is established. Simulation and experiment results verify effectiveness of the theoretical analysis and control scheme. The study provides insight for the CHB-STATCOM to reduce capacitance value, so control objectives of capacitor voltage can be satisfied. © 2019, Power System Technology Press. All right reserved.
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页码：275 / 284
页数：9
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