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

Abstract

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

CLC Number:

TP271

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.

Figures/Tables 7

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Table 1

System parameters used in simulations"

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

Table 1

Figure 6.

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

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