小容值单相H桥级联型STATCOM纹波电流分析

doi:10.16180/j.cnki.issn1007-7820.2020.05.009

电子科技 ›› 2020, Vol. 33 ›› Issue (5): 50-57.doi: 10.16180/j.cnki.issn1007-7820.2020.05.009

小容值单相H桥级联型STATCOM纹波电流分析

杜少通¹,段良玉¹,谢文娟²,杨万里¹

1. 河南理工大学电气工程与自动化学院,河南焦作 454000
2. 国网焦作供电公司,河南焦作 454000

收稿日期:2019-03-21 出版日期:2020-05-15 发布日期:2020-06-02
作者简介:杜少通(1985-),男,博士,讲师。研究方向:谐波抑制及无功补偿、多电平变流器的控制与应用。|段良玉(1996-),男,硕士研究生。研究方向:变流器小容值技术研究
基金资助:
国家自然科学基金(61703144);河南省教育厅高等学校重点科研项目(18A470003);河南理工大学博士基金(B2016-17)

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

DU Shaotong¹,DUAN Liangyu¹,XIE Wenjuan²,YANG Wanli¹

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)

摘要/Abstract

摘要：

采用薄膜电容的小容值单相H桥级联型STATCOM具有高可靠性的优点,但容值减小会造成直流侧波动电压随补偿容量增大而变大,而直流侧波动电压对STATCOM电流纹波又具有直接的影响。为明晰容值减小对H桥级联STATCOM纹波电流的影响,文中对单相小容值H桥级联型STATCOM系统电流纹波进行研究。基于单相小容值H桥级联型STATCOM控制系统,采用时序分析的方法建立载波相移脉宽调制的电流纹波表达式,通过数值分析定量研究容值对电流纹波的影响。研究结果表明,电容容值减小不会增大纹波电流。仿真实验验证了理论分析的正确性,为单相小容值H桥级联型STATCOM的设计提供理论参考。

关键词: 小容值, H桥级联, 静止同步补偿器, 电流纹波, 二倍频功率, 载波相移调制

Abstract:

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

中图分类号:

TP271

杜少通,段良玉,谢文娟,杨万里. 小容值单相H桥级联型STATCOM纹波电流分析[J]. 电子科技, 2020, 33(5): 50-57.

DU Shaotong,DUAN Liangyu,XIE Wenjuan,YANG Wanli. Analysis of Ripple Current in Low-Capacitance Single-Phase Cascaded H-bridge STATCOM[J]. Electronic Science and Technology, 2020, 33(5): 50-57.

图/表 7

图1

图2

图3

图4

图5

表1

仿真采用的系统参数"

项目	标幺值	真实值
电网电压幅值U_s	1	311.08 V
直流侧电压峰值 $u dc. p *$	0.55	172 V
无功电流幅值参考值I_q_.ref	1	24.5 A
滤波电抗L	0.08	3.2 mH
功率单元直流侧电容C	0.42	600 μF

表1

图6

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小容值单相H桥级联型STATCOM纹波电流分析

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

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