Electronic Science and Technology ›› 2020, Vol. 33 ›› Issue (5): 50-57.doi: 10.16180/j.cnki.issn1007-7820.2020.05.009

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Analysis of Ripple Current in Low-Capacitance Single-Phase Cascaded H-bridge STATCOM

DU Shaotong1,DUAN Liangyu1,XIE Wenjuan2,YANG Wanli1   

  1. 1. School of Electrical Engineering and Automation,Henan Polytechnic University, Jiaozuo 454000,China
    2. State Grid Jiaozuo Power Supply Company,Jiaozuo 454000,China
  • Received:2019-03-21 Online:2020-05-15 Published:2020-06-02
  • Supported by:
    National Natural Science Foundation of China(61703144);Key Scientific Research Projects of Higher Education Institutions of Henan Province(18A470003);Henan Polytechnic University Doctoral Fund(B2016-17)


Low-capacitance single-phase cascaded H-bridge STATCOM with thin film capacitor has the advantage of high reliability. But if the capacitance decreased, the DC side ripple voltage would increase as the compensation capacity increases. Besides, the DC side ripple voltage has a direct effect on the current ripple of STATCOM. In order to clarify the effect of the reduction of capacitance on the ripple current of cascaded H-bridge STATCOM, the current ripple of single-phase low-capacitance cascaded H-bridge STATCOM system was studied. Based on the single-phase low-capacitance cascaded H-bridge STATCOM control system, the approach of time series analysis was utilized to establish the current ripple expression of carrier phase shift pulse width modulation. The influence of capacitance on current ripple was investigated by numerical analysis. The analysis results showed that thecapacitor capacitance reduction failed to increase ripple current. The simulation results verified the correctness of the theoretical analysis, which provided an theoretical reference for the design of low-capacitance single-phase cascaded H-bridge STATCOM.

Key words: low-capacitance, cascaded H-bridge, STATCOM, ripple current, double frequency power, carrier phase shift modulation

CLC Number: 

  • TP271