Resistive Inverters Output Impedance Parallel Operation Strategy in Low-voltage Microgrid

被引：0
|
作者：
Zhang J. [1 ]
Zhao R. [1 ]
Liu Y. [1 ]
Yang P. [1 ]
Wu Z. [1 ]
Zhang X. [1 ]
机构：
[1] Inner Mongolia Key Lab of Solar Thermal and Wind Power, Inner Mongolia University of Science and Technology, Baotou
来源：
Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Adaptive virtual impedance; Circulation suppression; Low-voltage microgrid; Multi-loop control; Parallel inverter; Power distribution;
D O I：
10.13336/j.1003-6520.hve.20211241
中图分类号：
学科分类号：
摘要：
Parallel inverters require stronger circulating current suppression capabilities, excellent power distribution characteristics, and certain anti-interference capabilities. However, the traditional droop control and dual-loop control method have poor dynamic characteristics, low power distribution accuracy, and low circulation suppression effects. The stable operation of low-voltage microgrid system is affected by inverter output impedance, wiring impedance, and load characteristics. In response to these issues, we first analyze the application requirements of the inverter in detail, focusing on circulating current suppression and power sharing control strategy. On this basis, we propose a multi-loop control strategy with virtual negative inductance component and adaptive virtual impedance. This control strategy uses the negative inductance component to cancel the inductive component in the inverter output impedance, and dynamically adjusts the inverter wiring impedance parameters through adaptive virtual impedance. The superiority of this method is that the inverter output equivalent impedance exhibits resistive characteristics in a wider frequency band and simplifies the complicated decoupling control algorithm. In addition, we redesign the sag control outer loop to solve the voltage dip problem caused by virtual impedance and improve the power distribution accuracy and dynamic response speed. The simulation on PSCAD/EMTDC and experimental results demonstrate effectiveness of the proposed scheme. It is expected to have a wide range of applications in microgrid systems and photovoltaic power plants. © 2022, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：136 / 146
页数：10
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