摘要
电压不平衡和电压暂降是微电网中突出的电压质量问题。针对含单公共连接点(point of common coupling,PCC)和多PCC的微电网,提出一种基于下垂控制的面向多分布式电源(distributed generation,DG)的分区电压质量控制(zonal-voltage quality control,ZVQC)策略,将二次电压控制的思想引入DG的本地控制,不仅改善了微电网正常运行时PCC的电压质量,还可在微电网故障导致电压平衡跌落和不平衡跌落时能够支撑PCC电压并改善其不对称度,实现微电网区域及全网电压质量改善。此外,给出微电网ZVQC的原则,讨论DG附加容量的规划方法,并给出ZVQC的实施方案。最后在PSCAD/EMTDC中建立IEEE P1547.4典型微电网拓扑,仿真验证了所提方案的有效性和可行性。
Voltage unbalance and voltage sag are the most prominent voltage quality problems in microgrid. In this paper, a droop control based zonal-voltage quality control （ZVQC） strategy for multiple distributed generations （DGs） is proposed to solve the voltage quality issues for microgrid with single point of common coupling （PCC） and multiple PCCs. The strategy introduces the secondary control idea to DG＇s local control, supporting the voltage of PCCs both in normal condition and fault conditions, achieving local and global voltage quality improvement. Moreover, the principle of ZVQC is proposed and the additional capacity needed of DGs is discussed. The implementation scheme of ZVQC is also provided. Finally, the rationality of the proposed scheme is verified by simulation in PSCAD/EMTDC software environment.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第28期4827-4838,共12页
Proceedings of the CSEE
基金
国家重点基础研究发展计划项目(973项目)(2009CB219704)
国家自然科学基金项目(51177108)
高等学校博士学科点专项科研基金资助项目(20110032110066)~~
关键词
微电网
分布式电源
分区电压质量控制
低电压穿越
电压不平衡
电压暂降
microgrid
distributed generation （DG）
zonal-voltage quality control （ZVQC）
low voltage ride through （LVRT）
voltage unbalance
voltage sag
