孤立运行的低压微电网改进下垂控制策略  

Improved Droop Control Strategy for Islanded Low-voltage Microgrid

作　　者：闫卫国[1] 蒋菱[1] 陈晓祺 贾宏杰[3] 肖迁[3] 赵帅 YAN Weiguo;JIANG Ling;CHEN Xiaoqi;JIA Hongjie;XIAO Qian;ZHAO Shuai(State Grid Tianjin Electric Power Company,Tianjin 300010,China;Country Garden,Chengdu 610000,China;Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China)

机构地区：[1]国网天津市电力公司,天津300010 [2]碧桂园集团,成都610000 [3]天津大学智能电网教育部重点实验室,天津300072

出　　处：《电力系统及其自动化学报》2018年第6期45-52,共8页Proceedings of the CSU-EPSA

基　　金：国家高技术研究发展(863)计划资助项目(2015AA050403);国家自然科学基金资助项目(51377117)

摘　　要：针对低压微电网孤立运行时传统下垂控制策略的不足,提出了一种改进的下垂控制策略,从结构和参数优化两个方面对传统下垂控制进行了改进:在结构优化方面,考虑到在低压微电网线路中阻抗与感抗均不可忽略,将连接线路的阻抗角作为一个变量引入到下垂控制中,并添加了一个微分控制环节以增加控制器设计的自由度;在参数优化方面,通过粒子群优化算法对改进控制结构的参数实施优化,以期在微电网孤立运行时,为系统提供足够的阻尼,减小系统在暂态过程中的振荡。最后,通过Matlab/Simulink搭建了时域仿真模型,验证了本文所提控制策略的有效性和正确性。In light of the disadvantages of the conventional droop control strategy for an islanded low-voltage microgrid,an improved droop control strategy is proposed from the aspects of structure and parameter optimizations. From the firstaspect,considering the non-negligible resistance and inductance of lines in the low-voltage microgrid,the line impedance angle is introduced to droop control as a variable,and a differential control link is added to increase the number offreedoms in the controller design. From the second aspect,the parameters of the control structure are optimized by parti-cle swarm optimization（PSO）algorithm to provide enough system damping and thus reduce system oscillations duringthe transient process. Finally,simulation models are established in time domain using Matlab/Simulink,which verifiesthe effectiveness and correctness of the proposed control strategy.

关 键 词：下垂控制 微电网 粒子群优化 控制参数 分布式发电 

分 类 号：TM7[电气工程—电力系统及自动化]