基于改进下垂特性的微网功率控制方法

摘要

As a technology platform for the access of new energy and renewable energy to the smart grid, microgrid integrates the advantages of power generation from new energy and renewable energy effectively, enhances the comprehensively cascaded utilization of energy and provides a technological base for realizing the smart grid. This paper studies on power control methods of microgrid, and gives an overview of three existing types of classical control strategies with focus on the analysis of the power droop control method. The study shows that because the slope coefficient of conventional active power versus frequency droop control is iked,it is not be able to guarantee the quality of microgrid frequency. Instead microsources,which provide a novel active power versus frequency droop control method,can effectively ensure the frequency stability of microgrid operation. The simulation result verifies correctness and feasibility of this control method.%微网技术作为新能源及可再生能源接入智能电网的技术平台,可以有效整合新能源及可再生能源分布式发电的优势,实现能源的梯级利用,为智能电网的实现提供了必备的技术基础.针对微网的功率控制方法进行了研究,概述了现有的3类经典的控制方式,重点阐述并分析了微网功率下垂控制方法.结果表明,原常规有功功率-频率下垂控制的下垂系数固定无法保证微网的频率质量.提出微电源可采用一种改进的有功功率-频率的下垂控制方法,以有效保证微网运行的频率稳定.仿真结果表明了该控制方法的正确性和可行性.