Effect of Low Switching Frequency on Control Link of Grid-connected Inverter and Compensation Method

被引：0

作者：

Zhang Z. ^{[1
]}

Jing L. ^{[1
]}

Zhao Y. ^{[2
]}

Wu X. ^{[3
]}

Wang J. ^{[1
]}

Yang J. ^{[1
]}

机构：

[1] National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing

[2] Shenzhen Power Supply Bureau Co., Ltd., Shenzhen

[3] Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2020年 / 44卷 / 17期

基金：

国家重点研发计划;

关键词：

Grid-connected inverter; LCL filter; Low switching frequency; Phase lead compensation; Quasi-proportional-resonant (QPR) controller; Stability of current loop;

D O I：

10.7500/AEPS20191119001

中图分类号：

学科分类号：

摘要：

In order to prevent the resonance problem caused by the grid-side LCL filter of high-power grid-connected inverter, the passive damping method is usually used to suppress the resonance. However, the conventional passive damping method ignores the effect of digital delay on the system stability. Through the modeling in the discrete domain and the continuous domain and Nyquist stability criterion analysis, it is concluded that, when quasi-proportional-resonant (QPR) control is adopted, the digital delay angle at the low switching frequency will lead to negative crossing near the resonant frequency. This characteristic will lead to the unstable operation of current loop. And it is further concluded that the stability of the passive damping system under the control of QPR will not be affected by the change of grid impedance. In order to ensure the stability of current loop at the low switching frequency, this paper proposes a method to compensate the phase lag of resonant frequency of QPR controller by using phase lead compensation networks with low-pass characteristics and gives the design steps of lead compensation. Finally, the correctness and effectiveness of the proposed method are verified by simulation and experiment. © 2020 Automation of Electric Power Systems Press.

引用

页码：111 / 119

页数：8

共 24 条

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