低压微电网逆变器并联系统控制策略研究  

Control Strategy of Low Voltage Microgrid Inverter Parallel System

作　　者：任庭昊 代启璨 郝新翔 田家豪 张光余 车洵[2] 张代新[2] REN Tinghao;DAI Qican;HAO Xinxiang;TIAN Jiahao;ZHANG Guangyu;CHE Xun;ZHANG Daixin(Zunyi Power Supply Bureau of Guizhou Power Grid Co. Ltd.,Zunyi 563000,China;Nanjing Nanrui Jibao Electric Co. Ltd.,Nanjing 210000,China)

机构地区：[1]贵州电网有限责任公司遵义供电局,贵州遵义563000 [2]南京南瑞继保电气有限公司,江苏南京210000

出　　处：《智慧电力》2019年第6期34-39,共6页Smart Power

基　　金：国家自然科学基金资助项目(61503180)~~

摘　　要：在低压微电网中,逆变器并联系统容易受传输线路阻抗的影响,使得同容量并联的系统也无法实现功率均分。首先,结合2台逆变器并联系统,推导出不同传输阻抗性质下的功率计算方法。然后,以阻性为背景,分析环流产生的原因,以及传统下垂控制无法实现功率均分的机理。在传统下垂控制的基础上,引入负载电压反馈和微分控制,可以抑制传输线路阻抗对功率均分的干扰,提高系统的稳定性。最后,通过仿真和试验验证了控制策略的有效性。The inverter parallel system is susceptible to the impedance of the transmission line in the low-voltage microgrid,so that the system with the same capacity parallel can not achieve power sharing. Firstly,combined with two inverter parallel systems,the power calculation method under different transmission impedance properties is derived. Then,w ith the resistance as the background,the reason for the circulation is analyzed,and the mechanism that the traditional droop control can’tachieve power sharing is analyzed as well. Based on the traditional droop control,load voltage feedback and differential control are introduced to suppress the interference of the transmission line impedance to power sharing. Finally,the effectiveness of the control strategy is verified by simulation and experiment.

关 键 词：低压微电网 逆变器并联 改进下垂控制 功率分配 

分 类 号：TM464[电气工程—电器]