柔性直流配电系统下垂系数选取范围研究  

Study on the Scope of Droop Coefficient of Voltage Source Converter Based DC Distribution System

作　　者：刘刚 王秀茹 韩少华 邱冬 黄华峰 代鹏 LIU Gang;WANG Xiuru;HAN Shaohua;QIU Dong;HUANG Huafeng;DAI Peng(Suqian Power Supply Company,State Grid Jiangsu Electric Power Co.,Ltd,Suqian 223800,China)

机构地区：[1]江苏国网江苏省电力有限公司宿迁供电分公司,宿迁223800

出　　处：《电力系统及其自动化学报》2020年第4期9-13,20,共6页Proceedings of the CSU-EPSA

基　　金：国家电网有限公司科技资助项目(J2019111);国家自然科学基金青年科学基金资助项目(51807135);中国博士后基金特别资助项目(2019T120186)。

摘　　要：直流电压下垂控制模式下,如何选取合理的下垂系数成为直流配电网稳定控制范畴的难点。针对这个问题,本文提出一种适用于柔性直流配电系统的下垂系数选取方法。该方法在考虑下垂控制特性和网络传输特性的基础上,针对柔性直流系统整流侧和逆变侧分别建立带下垂控制特性的P-V特性曲线,得到了下垂系数选取范围与参考运行工作点的关系,揭示了下垂控制对直流系统可行域的影响规律,即随着下垂控制功率参考值的增大,为了保障直流电压运行在合理水平,下垂系数不能超过上限。How to choose a reasonable droop coefficient in the DC voltage droop control mode is difficult for the stability control of a DC distribution network. To solve this problem,a selection method is proposed for the droop coefficient scope of a voltage source converter(VSC)based DC distribution system. Based on the droop control characteristics and network transmission characteristics,the P-V characteristic curves with droop control characteristics are established for the VSC based DC distribution system on the rectifier and inverter sides,respectively. The relation between the droop coefficient scope and reference operation points is obtained,and the influences of droop control on the feasible operating region of the DC system are revealed,i.e.,along with the increase in reference power under droop control,the droop coefficient should not exceed the safety margin in order to keep the DC voltage operating at a reasonable level.

关 键 词：电压源型换流器 柔性直流配电 电压下垂控制 下垂系数 运行工作点 

分 类 号：TM72[电气工程—电力系统及自动化]