动态电容器复合控制策略及其谐振问题分析

电气工程学报 ›› 2015, Vol. 10 ›› Issue (7): 33-40.

动态电容器复合控制策略及其谐振问题分析

戴子薇¹,陈新文¹,王欣²,戴珂¹

1.华中科技大学强电磁工程与新技术国家重点实验室武汉 430074
2.台达电子企业管理有限公司上海 201209

收稿日期:2015-03-24 出版日期:2015-07-25 发布日期:2015-07-25
作者简介:戴子薇女 1994年生,目前主要从事电力电子与电力传动的研究。|陈新文男 1990年生,博士研究生,研究方向为电能质量控制技术。
基金资助:
国家自然科学基金面上资助项目(51277086)

Analysis of Resonance Problem and Integrated Control Strategy for Dynamic Capacitor

Dai Ziwei¹,Chen Xinwen¹,Wang Xin²,Dai Ke¹

1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China
2.Delta Electronics CO., LTD Shanghai 201209 China

Received:2015-03-24 Online:2015-07-25 Published:2015-07-25

摘要/Abstract

摘要：

电力电容器是补偿电力系统静态无功的基本元件,本文采用Buck型交流变换器对其进行改造形成动态电容器,在多同步旋转坐标系下采用偶次谐波调制的控制方法,进行了动态电容器的Matlab/Simulink建模仿真,验证了其无功和谐波等复合补偿功能。同时,理论分析表明,静态和动态电容器均可能导致电力系统谐波谐振问题,在检测网侧电流对动态电容器进行控制的情况下,控制系统的环路稳定性因谐波谐振的存在而遭到破坏,可以通过改变谐振谐波检测指令极性的方法对其进行有效抑制,初步的仿真结果完全验证了上述分析的正确性。

关键词: 动态电容器, 偶次谐波调制, 复合补偿, 谐波谐振

Abstract:

Power capacitor, was a basic element to supply static VAR in power system, which could be upgraded into dynamic capacitor using Buck-type AC-AC converter in this paper. By means of multiple synchronous reference frames and even harmonic modulation method, the simulation model of dynamic capacitor was built under Matlab/Simulink environment, and the VAR and harmonic integrated compensation functions of it were well proved. In the meanwhile, it was shown that either static or dynamic capacitor might cause harmonic resonance problem. The stability of the control loop of dynamic capacitor was corrupted for the existence of harmonic resonance when method of measuring grid current was used to control it. It could be improved by changing the polarity of resonant harmonic references, which was completely verified by preliminary simulation results.

Key words: Dynamic capacitor, even harmonic modulation, integrated compensation, harmonic resonance

中图分类号:

戴子薇,陈新文,王欣,戴珂. 动态电容器复合控制策略及其谐振问题分析[J]. 电气工程学报, 2015, 10(7): 33-40.

Dai Ziwei,Chen Xinwen,Wang Xin,Dai Ke. Analysis of Resonance Problem and Integrated Control Strategy for Dynamic Capacitor[J]. Journal of Electrical Engineering, 2015, 10(7): 33-40.

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参考文献 11

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参数			数值
电源		电网电压V_s/V	380
		电网频率f/Hz	50
		电网等效电感L_s/μH	239
非线性负载		不控整流桥直流侧电感L/mH	80
		不控整流桥直流侧电阻R/Ω	24
		三相平衡感性负载电感L′/mH	9.6
		三相平衡感性负载电阻R′/Ω	1
D-CAP	硬件参数	无功补偿电容C/μF	900
		滤波电感L_F1/μH	12.5
		输入滤波电容C_F/μF	121
		输入滤波电感L_F2/μH	55.2
	控制参数	开关频率f_SW/kHz	16.5
		PI系数[k_{q1_P},k_{q1_I}]	[0,–1]
		PI系数[k_{d5_P},k_{q5_P},k_{d5_I},k_{q5_I}]	[0,0,0.3,–0.3]
		PI系数[k_{d7_P},k_{q7_P},k_{d7_I},k_{q7_I}]	[0,0,–0.1,–0.1]
		PI系数[k_{d11_P},k_{q11_P},k_{d11_I},k_{q11_I}]	[0,0,0.3,0.3]
		PI系数[k_{d13_P},k_{q13_P},k_{d13_I},k_{q13_I}]	[0,0,–0.1,–0.1]
		二阶LPF截止频率/Hz	50

谐波次数	无D-CAP		无功补偿			复合补偿			谐振抑制复合补偿
谐波次数	网侧电流幅值/A	PCC电压（%）	负载电流幅值/A	网侧电流幅值/A	PCC电压（%）	负载电流幅值/A	网侧电流幅值/A	PCC电压（%）	负载电流幅值/A	网侧电流幅值/A	PCC电压（%）
基波	69.64	100	70.04	54.69	100	68.34	55.31	100	69.61	54.73	100
5	4.60	0.54	4.64	6.45	0.75	2.93	0.16	0.22	4.72	0.00	0.00
7	3.16	0.52	3.17	8.06	1.32	2.23	0.30	0.24	3.33	0.00	0.00
11	2.00	0.52	2.13	1.94	0.50	4.47	117.53	30.35	2.12	0.00	0.00
13	1.65	0.50	1.77	0.58	0.18	2.70	39.70	11.83	1.79	0.00	0.00