浙江电力

2021, v.40;No.300(04) 25-31

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孤岛微电网中基于电压-频率下垂与磁链-相角下垂两种控制策略的性能比较
Performance Comparison of Two Control Strategies Based on Voltage-Frequency Droop and Linkage-Phase Angle Droop

张佳
ZHANG Jia

摘要(Abstract):

当微电网孤岛运行时,需要一定的控制策略建立系统内的电压和频率平衡。下垂控制因为不依赖于通信设备、运行可靠性高、"即插即用"等优点成为了微电网中广泛采用的控制策略。目前主要包括电压下垂控制和磁链下垂控制两种。首先,介绍了两种下垂控制的原理与下垂控制器设计。接下来,利用MATLAB/Simulink搭建了一个微源模型,分别利用以上两种策略对微源进行控制,并比较了两种策略下的输出电压、电流、频率特性。比较结果表明两种策略各有优劣。其中电压下垂控制比较复杂,频率偏差较大,但是电压、电流波形更好,谐波含量较小;磁链下垂控制比较简单,可以实现频率的微小偏差甚至零偏差,但是输出的电压、电流谐波含量较大。
Under the condition of islanding operation of microgrid, a control strategy is required to strike a balance between voltage and frequency in the system. Droop control, without dependency on communication equipment, and with its high operation reliability and Plug-and-Play, has now been widely used in microgrid.The droop control comprises voltage droop control and linkage droop control. Firstly, the principle of the droop control and design of droop controller is introduced; secondly, MATLAB/Simulink is used to build a microsource model, and the two strategies are employed to control the microsource and the output voltage, current and frequency characteristics are compared. The results show that voltage droop control is complex with large frequency deviation, better current waveform and small harmonic content while the linkage droop control is simple, with small or even zero frequency deviation and large output current and voltage harmonic content.

关键词(KeyWords): 微电网;孤岛运行;电压下垂;磁链下垂;频率偏差
microgrid;islanded operation;voltage droop;linkage droop;frequency deviation

Abstract:

Keywords:

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作者(Author): 张佳
ZHANG Jia

DOI: 10.19585/j.zjdl.202104004

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