一种适用于多端柔性直流输配电系统的新型电压下垂控制方法  

Novel Voltage Droop Control Method for VSC Based Multi-terminal DC System

作　　者：王秀茹 刘刚 王一振 张科 董平平 赵航宇 WANG Xiuru;LIU Gang;WANG Yizhen;ZHANG Ke;DONG Pingping;ZHAO Hangyu(Suqian Power Supply Company,State Grid Jiangsu Electric Power Co.,Ltd,Suqian 223800,China;School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,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 [2]天津大学电气自动化与信息工程学院,天津300072

出　　处：《电力系统及其自动化学报》2021年第2期136-141,共6页Proceedings of the CSU-EPSA

基　　金：国网江苏省电力有限公司科技资助项目(J2019111);国家自然科学基金资助青年项目(51807135);中国博士后基金特别资助项目(2019T120186);中国博士后基金资助面上项目(2018M631738)。

摘　　要：如何保障多端柔性直流输配电系统在不同程度扰动下安全稳定运行是柔性直流技术发展所面临的一个挑战。针对这个问题,提出了一种适用于多端柔性直流输配电系统的电压下垂控制方法。该方法在电压-有功功率下垂控制的基础上,利用本地直流电压偏差信息实时调整下垂控制的运行工作点,使得直流电压靠近电压上限时自动往下调整,保障系统在各种扰动下直流电压分布合理,不超过稳定运行范围,具有抗干扰能力强、不依赖通讯的优势。最后,在PSCAD/EMTDC中建立四端柔性直流系统,验证了所提电压下垂控制方法的正确性和有效性。How to ensure the safe and stable operation of a voltage source converter(VSC)based multi-terminal DC(VSC-MTDC)system under different disturbances poses a challenge to the development of the VSC DC technology.To tackle this problem,a novel voltage droop control method is proposed for the VSC-MTDC system.Based on the droop control of voltage-active power,it uses the local DC voltage deviation information to adjust the operating point under droop control in real time.When the DC voltage of the VSC rises up close to the upper limit,it will be adjusted downwards automatically to ensure a reasonable DC voltage distribution under different disturbances,without exceeding the stable operation range.As a result,the proposed method has advantages of strong anti-interference capability and no reliance on communication.At last,a four-terminal VSC based DC system is built on the PSCAD/EMTDC platform,and results validate the correctness and effectiveness of the proposed voltage droop control method.

关 键 词：电压源型换流器 多端柔性直流系统 电压下垂控制 直流电压偏差 运行工作点 

分 类 号：TM711[电气工程—电力系统及自动化]