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电网技术  2014 

微电网系统准同期并网改进控制策略

DOI: 10.13335/j.1000-3673.pst.2014.11.020, PP. 3071-3078

Keywords: 微电网,准同期,电网电压不平衡,正负序分量

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Abstract:

微电网中越来越多以电力电子装置为接口的分布式电源采用模拟同步发电机的下垂控制策略来实现并网和孤岛工况的运行及相互之间的切换。基于分布式电源下垂控制策略和传统电网自动准同期并列装置工作原理,分析了微电网系统准同期并网原理,将频率调节和相角调节进行了统一,提出了一种微电网系统准同期并网的改进简化方法。针对电网末端三相电压不平衡等实际工况,采用正负序角度之和实现通信的传输,降低了对通信实时性的要求,增加负序分量的同步环节,提出了一种弱电网工况微电网系统准同期并网的方法,仿真和实验研究验证了该方法的可行性。

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