基于虚拟频率的微电网下垂控制策略设计 droop control strategy design of microgrid based on virtual frequency.pdfVIP

37 卷 12 期 电 网 技 术 Vol. 37 No. 12 20 13 年12 月 Power System Technology Dec. 2013 文章编号：1000-3673 （2013 ）12-3331-05 中图分类号：TM 721 文献标志码：A 学科代码：470 4051 基于虚拟频率的微电网下垂控制策略设计 高春凤，杨仁刚，王江波，周献飞 （中国农业大学信息与电气工程学院，北京市 海淀区 100086 ） Droop Control Strategy Design of Microgrid Based on Virtual Frequency GAO Chunfeng, YANG Rengang, WANG Jiangbo, ZHOU Xianfei (College of Information and Electrical Engineering, China Agricultural University, Haidian District, Beijing 10086, China) ABSTRACT: According to the resistive characteristic of 保 微电网稳定可靠运行，成为了现代电力工业技 low-voltage microgrid, decoupling control of active power and 术领域的研究热点。微电网的控制方式主要分为主 reactive power is achieved. Voltage droop control method was [2-3] 从式和对等式 。主从控制以某DG 或上层中心控 used in active power distribution, and phase angle droop 制器作为主控制单元，其他各 DG 通过通讯线与主 control method was used in reactive power distribution. On the 控制单元连接，便于上级管理系统的协调控制。微 basis of analysis of droop control model, since the phase angle of distributed generator is determined by two parts: frequency 电网自主运行时，一般采用对等式控制，要求各DG and the initial phase angle, virtual frequency which is proposed 在无通讯的情况下，能跟随负荷自 调整功率输 in this paper is applied to the voltage/phase-angle droop control 出，同时满足系统对输出电压幅值和频率的要求。 strategy. In the improved control strategy, the change of virtual 在线路阻抗主要为感性的高压微电网或旋转 frequency converts into the change of the initial phase angle. 发电机中，常规下垂(有功–频率、无功– 电压)控制 Feasibility and effectiveness of the strategy is confirmed by [4-6] Matlab simulation. 可以取得