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分布式电源并网惯性功率补偿研究

Power System Protection and Control(2019)

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Abstract
虚拟同步电机(Virtual Synchronous Generator,VSG)通过引入转动惯量提高系统频率稳定,但相较于分布式电源(Distributed Generation,DG)传统并网模式,其控制算法复杂,设备成本高,惯量设置分散.针对如何在不改变现有DG传统并网系统的前提下,更简单经济地增加系统的转动惯量展开研究.首先,分析虚拟同步电机暂态响应过程,经过功率解耦分解出转子惯性功率.然后,基于转子惯性功率响应特性和超级电容的运行特性,借鉴静止无功补偿器(Static Var Compensator,SVC),提出静止惯性补偿器(Static Inertia Compensator,SIC)的概念.最后,在Matlab/Simulink中搭建仿真模型,验证所提想法的有效性.结果表明,SIC通过检测频率变化情况向节点提供惯性功率,可以提高系统转动惯量从而增强系统频率稳定,能够达到虚拟同步电机稳定频率的效果.
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Key words
inertia power compensating,distributed generation,grid-connected
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