基于Simplex算法的LCC-LCC+FBMMC串联型混合直流输电系统的参数优化方法  

Parameter Optimization Method Based on Simplex Algorithm for LCC-LCC + FBMMC Series Based Hybrid HVDC System

作　　者：赵剑 刘炜 郭春义 陆翌 裘鹏 宣佳卓 李继红 ZHAO Jian;LIU Wei;GUO Chunyi;LU QIU Peng;XUAN Jiazhuo;LI Jihong(State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources （North China Electric Power University）, Beijing 102206, China;Electric Power Research Institute of State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310014,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市102206 [2]国网浙江省电力公司电力科学研究院,杭州市310014

出　　处：《电力建设》2018年第2期95-102,共8页Electric Power Construction

基　　金：中央高校基本科研业务专项资金(2017XS17);国网浙江省电力公司科技项目(5211ZS1500GB)~~

摘　　要：整流侧采用电网换相换流器(line commutated converter,LCC),逆变侧采用LCC与全桥型模块化多电平换流器(full bridge submodule based modular multilevel converter,FBMMC)串联的混合型直流输电系统,具有直流故障穿越、换相失败抑制及潮流灵活反转等技术优势,是一种适于未来远距离大容量架空线输电场合的混合直流输电拓扑结构。控制器参数的合理优化选取是保证系统优良运行性能的前提条件。首先建立了LCC-LCC+FBMMC串联型混合直流输电系统的数学模型,在此基础上提出了一种基于Simplex算法的参数优化方法,构造了基于控制信号偏差的目标函数对该混合系统整流侧和逆变侧控制器的参数进行优化。最后,在PSCAD/EMTDC仿真环境下搭建了LCC-LCC+FBM M C串联型混合直流输电系统仿真模型,针对有功功率阶跃、潮流反转、交流侧三相接地短路故障和直流侧接地故障4种不同工况,仿真验证了所提优化方法的有效性。结果表明基于所提优化方法得到的控制器参数,可以有效改善LCC-LCC+FBMMC串联型混合直流输电系统在不同工况下稳态和暂态运行特性。A LCC-LCC ＋ FBM M C series based hybrid HVDC system,for which the rectifier side adopts the line commutated converter（ LCC）,and the inverter side is composed by LCC in series with the full bridge sub module modular multilevel converter（ FBM M C）,with the technical advantages of DC fault ride-through,mitigating commutation failure,and power flexible reversal capability and so on,is a kind of hybrid dc transmission topology suitable for future long-distance high-capacity overhead transmission. Reasonable and effective selection of controller parameters is a prerequisite for ensuring good performance of the system. This paper first establishes the mathematical model of LCC-LCC ＋ FBM M C series based hybrid HVDC system; on this basis,proposes a controller parameter optimization method based on Simplex algorithm,and constructs an objective function based on the deviation of controller input signal to optimize the controller parameters both on the rectifier and inverter sides. Finally,an EM T model of LCC-LCC ＋ FBM M C series based hybrid HVDC system is established in PSCAD/EM TDC,and tested under four different conditions,including active power step-change,power reversal,three-phase short-circuit fault and DC ground fault. The simulation results prove the effectiveness of the proposed optimization method,which showthat the controller parameters based on the proposed optimization method can improve both the steady and transient performance of LCC-LCC ＋ FBM M C system in different operating conditions.

关 键 词：混合直流输电系统 电网换相换流器(LCC) 模块化多电平换流器(MMC) Simplex算法 参数优化 

分 类 号：TM744[电气工程—电力系统及自动化]