Reactive Current Reshaping With Series Resonance Damping for Three-Phase Buck-Type Dynamic Capacitor

被引:4
作者
Wu, Qi [1 ]
Dai, Ke [1 ]
Chen, Xinwen [2 ]
Zhang, Yuxiao [1 ]
Xu, Chen [1 ]
Dai, Ziwei [3 ]
机构
[1] Huazhong Univ Sci & Technol, Sch Elect & Elect Engn, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Hubei, Peoples R China
[2] Huazhong Inst Electroopt, Wuhan Natl Lab Optoelect, Wuhan 430223, Hubei, Peoples R China
[3] Rensselaer Polytech Inst, Dept Elect Comp & Syst Engn, Troy, NY 12180 USA
来源
IEEE ACCESS | 2019年 / 7卷
基金
中国国家自然科学基金;
关键词
Harmonic analysis; Reactive power; Damping; Power capacitors; Harmonic distortion; Voltage control; Buck-type dynamic capacitor; reactive power compensation; waveform distortion; current reshaping; series resonance damping; DEAD-TIME; HARMONIC SUPPRESSION; COMPENSATION; INVERTER; FILTER;
D O I
10.1109/ACCESS.2019.2944520
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
By adding Buck-type AC/AC converter to conventional power capacitor, dynamic capacitor (D-CAP) can be formed to compensate variable rather than fixed reactive power. However, some nonlinear distortion factors, namely grid harmonic voltage, voltage drop of switches and dead-time, would cause harmonics in its compensation current, meanwhile, its capacitance may interact with the grid inductance to cause series resonance. Both nonlinear distortion factors and series resonance would distort the waveform of its compensation current and make the grid current failed to meet the power quality standard IEEE Std.519. This paper focuses on the output current distortion of Buck-type D-CAP in reactive power compensation. For harmonic distortion, through establishing the equivalent circuit of Buck-type D-CAP, the generation of low-order harmonic current is investigated under three nonlinear factors. A current reshaping method to simultaneously diminish the harmonics caused by the three nonlinear distortion factors is thus adopted, which is a feedback control of output current harmonics. Then for series resonance, based on the block diagram of Buck-type D-CAP within the grid, transfer function from grid voltage to the output current is deduced and the corresponding Bode diagram is depicted. An active damping method is therefore suggested to shrink the low-order series resonance peak, by detecting power capacitors voltage for feedback control. Finally, a combined control, reactive current reshaping with series resonance damping is proposed in this paper for three-phase Buck-type D-CAP. A wide variety of experimental results from a 33kVar/220V laboratory prototype are provided to demonstrate the validity of the combined control.
引用
收藏
页码:142663 / 142674
页数:12
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