基于下垂控制的逆变器参数对微电网稳定性的影响研究

doi:10.3969/j.issn.1000-7229.2018.08.015

摘要/Abstract

摘要： 微电网对新能源具有较强的接纳能力。作为最能体现分布式电源“即插即用”特性控制技术，下垂控制也是实现孤岛模式下微电网电源间协调运行的热点技术。然而，当前该领域的研究大多集中在网络拓扑层面，对逆变器内在控制结构的研究并不深入。文章首先着眼于微电网下垂控制策略中逆变器个体的控制稳定性，在深入研究内在控制结构的基础上，建立了个体逆变器控制的全结构小信号传递函数模型；其次结合案例，从理论角度定量分析了控制器参数（下垂系数与电压环系数）的变化对系统稳定性的影响，并结合根轨迹法确定控制参数的选择范围，为逆变器的选择提供参考；最后利用时域仿真验证模型的实效性与分析方法的实用性，并证明结果能满足微电网稳定运行与动态特性要求。

关键词: 下垂控制, 逆变器, 小信号模型, 控制参数配置, 微电网稳定性

Abstract: As we all know, microgrid has a strong acceptance of new energy. Droop control is the hotspot technology to realize the coordinated operation of power supply in island microgrid, which can best embody the “plug and play” characteristic of distributed generators （DG）. However, most research in this field is focused on the network topology, while ignoring the inverters internal control structure to some extent. From the droop control strategy used in the inverter, first of all, on the basis of in-depth study of the internal structure, the paper establishes a full-structure small-signal function model. Next, the effect of the change of controller parameters （droop coefficient and voltage loop coefficient） on the system stability is analyzed quantificationally via a case. And then, the range of control parameters is determined by the root locus method to provide selection reference for the inverters. Finally, time domain simulation is used to show the effectiveness of the model and the practicability of the analysis method. The results are also proved to satisfy the stable operation and dynamic characteristics of the microgrid.

Key words: droop control, inverter, small signal model, control parameter configuration, microgrid stability

中图分类号:

TM 73

梁海峰，董玥，郑灿. 基于下垂控制的逆变器参数对微电网稳定性的影响研究[J]. 电力建设, 2018, 39(8): 119-127.

LIANG Haifeng，DONG Yue，ZHENG Can. Influence of Inverter Parameters Based on Droop Control on Microgrid Stability[J]. Electric Power Construction, 2018, 39(8): 119-127.

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