适用于多端柔性直流输电系统的新型直流电压控制策略  

A Novel DC Voltage Control Strategy for VSC-MTDC Systems

作　　者：唐庚[1] 徐政[1] 刘昇[1] 顾益磊[2] 陆羿[2] 裘鹏[2] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]浙江省电力试验研究院,浙江省杭州市310014

出　　处：《电力系统自动化》2013年第15期125-132,共8页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA051704)~~

摘　　要：重点关注适用于多端柔性直流输电系统的直流电压协调控制策略,分析了现今最受认可的直流电压偏差控制策略以及直流电压斜率控制策略的缺陷,并结合2种控制策略的优点,提出了一种新型直流电压控制策略——直流电压偏差斜率控制策略。该控制策略利用直流电压偏差控制策略的偏差特性,实现了换流站直流功率的跟踪;利用直流电压斜率控制策略的斜率特性,加快了其动态响应能力。最后,在PSCAD/EMTDC仿真平台中针对直流电压偏差斜率控制策略的特性进行了稳态仿真分析以及暂态仿真分析,仿真结果表明:采用直流电压偏差斜率控制策略后,多端柔性直流输电系统能够稳定、可靠运行。This paper focuses on the direct current（DC） voltage control strategy in the voltage source converter suitable for multi-terminal DC（VSC-MTDC） systems.The demerits of the most recognized DC voltage margin control strategy and DC voltage droop control strategy are analyzed.And by referring to the merits of the two strategies,a novel DC voltage control strategy named the DC voltage margin droop control strategy is proposed.The DC power tracking of the converter station is achieved by applying the margin property,while the droop property helps with its dynamic response speed.Finally,steady state and transient state simulations are performed with PSCAD/EMTDC to validate the feasibility of the proposed strategy.The results show that by applying the DC voltage margin droop control strategy,the VSC-MTDC system runs stably and reliably.

关 键 词：电压源型换流器 多端直流输电 直流电压控制 偏差控制 斜率控制 偏差斜率控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]