星形CHB STATCOM启动冲击电流的抑制方法*

doi:10.11985/2022.01.010

电气工程学报 ›› 2022, Vol. 17 ›› Issue (1): 71-77.doi: 10.11985/2022.01.010

所属专题：特邀专栏：电力电子化配电网关键设备和运行控制

• 特邀专栏: 电力电子化配电网关键设备和运行控制 • 上一篇下一篇

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星形CHB STATCOM启动冲击电流的抑制方法^*

吴天红¹(), 魏缪宇¹(), 陆道荣²(), 胡海兵¹()

1.南京航空航天大学自动化学院南京 211106
2.南京师范大学电气与自动化工程学院南京 210046

收稿日期:2021-08-10 修回日期:2022-10-11 出版日期:2022-03-25 发布日期:2022-05-06
通讯作者: 陆道荣 E-mail:1336799056@qq.com;weimaoyunj@nuaa.edu.cn;tcludaorong@nuaa.edu.cn;huhaibing@nuaa.edu.cn
作者简介:吴天红,男,1998年生,硕士研究生。主要研究方向为无功补偿与多电平变换器控制。E-mail： 1336799056@qq.com;
魏缪宇,男,1994年生,博士研究生。主要研究方向为电能质量治理与多电平变换器控制。E-mail： weimaoyunj@nuaa.edu.cn;
胡海兵,男,1973年生,教授,博士研究生导师。主要研究方向为电能质量治理、多电平变换器控制、谐振变换器等。E-mail： huhaibing@nuaa.edu.cn
基金资助:
*国家自然科学基金资助项目(52007081)

Startup Inrush Current Suppression Method for Star-connected CHB STATCOM

WU Tianhong¹(), WEI Miaoyu¹(), LU Daorong²(), HU Haibing¹()

1. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106
2. School of NARI Electric and Automation, Nanjing Normal University, Nanjing 210046

Received:2021-08-10 Revised:2022-10-11 Online:2022-03-25 Published:2022-05-06
Contact: LU Daorong E-mail:1336799056@qq.com;weimaoyunj@nuaa.edu.cn;tcludaorong@nuaa.edu.cn;huhaibing@nuaa.edu.cn

摘要/Abstract

摘要：

软启动对星形级联H桥(CHB)STATCOM的正常运行至关重要。传统的CHB STATCOM启动策略通过在不控整流过程中串联限流电阻来抑制浪涌电流。然而,由于不控整流后直流侧电容电压仍然较低,CHB STATCOM进入正常运行时会产生较大的浪涌电流。为了消除这种浪涌电流,提出一种新的CHB STATCOM启动控制方法,在不控整流阶段后引入可控升压阶段,继续串联限流电阻,进一步提高直流电容电压。在可控升压阶段中,建立了调制电压与直流电压的关系,在此基础上提出了一种直流电压的闭环控制方法。最后,搭建400 V/5 kVar CHB STATCOM样机,试验结果验证了所提启动控制策略的有效性。

关键词: CHB STATCOM, 限流电阻, 浪涌电流, 启动控制

Abstract:

Soft startup is essential to the operation of the star-connected cascaded H-bridge (CHB) STATCOM. Conventional CHB STATCOM startup strategy suppresses inrush current by connecting current limiting resistors in series during uncontrolled rectification. However, due to the low DC-side capacitor voltage after the start-up phase, the CHB STATCOM will still generate a large inrush current when it enters the normal operating state. To eliminate this inrush current, a novel startup control is proposed to further charge the DC voltages after the uncontrolled rectifier process. After the uncontrolled rectification stage, the controllable boost stage is introduced, and the current limiting resistors continues to be connected in series, thereby further increasing the DC capacitor voltage. In the controllable boost stage, the relationship between modulation voltages and DC voltages is established, based on which a closed-loop control is proposed. The effectiveness of the proposed control is verified by the experimental results on a 400 V/5 kVar CHB STATCOM.

Key words: CHB STATCOM, current limiting resisters, inrush current, startup control

中图分类号:

TM561

吴天红, 魏缪宇, 陆道荣, 胡海兵. 星形CHB STATCOM启动冲击电流的抑制方法^*[J]. 电气工程学报, 2022, 17(1): 71-77.

WU Tianhong, WEI Miaoyu, LU Daorong, HU Haibing. Startup Inrush Current Suppression Method for Star-connected CHB STATCOM[J]. Journal of Electrical Engineering, 2022, 17(1): 71-77.

图/表 14

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参数	数值
网侧线电压幅值E_m/V	400
输出无功功率Q/kVar	5
直流侧电容容值C/mF	3
直流侧电容电压U_norm/V	85
交流侧电感阻抗L/mH	6
限流电阻阻值R/Ω	20
每相级联模块数N	5

星形CHB STATCOM启动冲击电流的抑制方法^*

Startup Inrush Current Suppression Method for Star-connected CHB STATCOM

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