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所属单位：自动化学院

发表刊物：Dianli Xitong Zidonghue

摘要：In the grid-connected system with paralleled inverters, the safe operation of inverters is challenged by the resonant circulating current which is usually located beyond the control bandwidth. In order to analyze the characteristics of resonant circulating current, the digital control and the nonlinear link of pulse width modulation are taken into consideration. Based on the one-dimensional spectrum analysis method, this paper studies the harmonic component of the inverter output voltage when the modulated wave is disturbed. Then the multi-frequency impedance model for the single-phase paralleled grid-connected inverters is developed. Based on the generalized Nyquist stability criterion, the influence of the control carrier phase on the parallel system stability is analyzed, and the frequency of the resonant circulating current can be readily predicted. Finally, it is pointed out that the enlargement of the modulus of the output impedance contributes to suppressing the resonant circulating current. The experimental results verified the correctness and effectiveness of the proposed multi-frequency impedance model. © 2019 Automation of Electric Power Systems Press.

ISSN号：1000-1026

是否译文：否

发表时间：2019-08-10

合写作者：Qian, Qiang,Wei, Qi,谢少军,F70206578,Wang, Weijian

通讯作者：Qian, Qiang,韦青燕