混合多端直流输电系统的损耗优化控制  

Loss Optimization Control for Hybrid Multi-terminal DC Transmission System

作　　者：陈东 许冬 韩民晓[2] 陈守军[3] 刘庆时[3] 贾东强[3] CHEN Dong;XU Dong;HAN Minxiao;CHEN Shoujun;LIU Qingshi;JIA Dongqiang(State Grid Economic and Technological Research Institute Co. Ltd., Beijing 102209, China;School of Electrical ~ Electronic Engineering, North China Electric Power University, Beijing 102206, China;State Grid Beijing Electric Power Company, Beijing, 100031, China)

机构地区：[1]国网经济技术研究院有限公司,北京市102209 [2]华北电力大学电气与电子工程学院,北京市102206 [3]国网北京市电力公司,北京市100031

出　　处：《电力系统自动化》2018年第10期100-105,共6页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2016YFB0900900);国家电网公司科技项目(5202011600TV)~~

摘　　要：为解决混合多端直流输电系统采用下垂控制时,不能在任意功率下运行在最优工作点的问题,提出了损耗优化控制策略。此控制策略分为两层:上层为优化控制,根据混合多端直流输电系统不同的注入功率计算下垂控制参数;底层为下垂控制,以实现对功率变化的快速调节。此控制策略在实现混合多端直流损耗最小的同时,也考虑了电网换相换流器逆变站最小熄弧角的限制,因而实现了混合多端直流输电系统的稳定与经济运行。为验证所提控制策略的有效性,建立了混合六端直流输电系统模型,首先根据提出的优化算法计算了此模型的稳态优化结果,然后在PSCAD/EMTDC中进行了仿真验证。在功率波动、通信故障情形下的仿真结果表明,所提损耗优化控制策略的降损效果与理论计算结果一致,并且满足系统约束,使混合多端直流输电系统不仅在送端功率变化时有良好的损耗优化效果,而且在通信故障时仍然能保持稳定运行。In order to solve the problem that the hybrid multi-terminal DC transmission system cannot operate in the optimal mode under arbitrary power when using the droop control,a loss optimization control strategy is proposed.The control strategy can be divided into two layers.The upper level is the optimization control,which calculates the droop control parameter according to the different inject power of hybrid multi-terminal DC transmission system.The lower level is the droop control to obtain the fast response to power fluctuation.This control scheme successfully obtains the minimum of multiterminal DC loss and takes the limit of minimum extinguish angle into account for the inverter stations in the grid,which realizes the stable and economic operation of hybrid multi-terminal DC transmission system.In order to verify the effectivity of the proposed control strategy,a six-terminal hybrid DC transmission system is designed.Firstly,the proposed optimal method is used to calculate the stable and optimized results of this model.Then the simulation model is built in PSCAD/EMTDC.The simulation results in the field of power fluctuation and communication failure show that the optimization result of the proposed droop parameter design approach is consistent with the theoretical calculation and satisfies the system constrains.The hybrid multi-terminal DC transmission system not only has good dynamic response of loss optimization when the transmitter power changes but also remains stable during the communication failure.

关 键 词：混合多端直流输电系统 下垂控制 直流输电损耗 损耗优化 

分 类 号：TM721.1[电气工程—电力系统及自动化]