适用于特高压多端混合直流输电系统的稳态电压控制方法  

A steady-state voltage control method for a multi-terminal hybrid UHVDC transmission system

作　　者：俞翔 鲁江[1] 董云龙[1] 张庆武[1] 甘宗跃 王杨正[1] YU Xiang;LU Jiang;DONG Yunlong;ZHANG Qingwu;GAN Zongyue;WANG Yangzheng(NR Electric Co.,Ltd.,Nanjing 211102,China;EHV Power Transmission Company,China Southern Power Grid Co.,Ltd.,Guangzhou 510663,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102 [2]中国南方电网有限责任公司超高压输电公司,广东广州510663

出　　处：《电力系统保护与控制》2022年第1期174-180,共7页Power System Protection and Control

基　　金：国家重点研发计划项目资助(2016YFB0900602)。

摘　　要：特高压多端混合直流输电系统稳态运行时,定直流电压站的控制目标是维持首端整流站的端口电压为设定值。当首端整流站不是定直流电压站时,则需考虑线路压降带来的影响,而此时传统的电压偏差控制和下垂控制无法实现对电压和功率的无差控制。因此基于主从控制思想,提出了一种适用于特高压多端混合直流输电系统的稳态电压控制方法。基于当前直流系统的接线方式、线路电阻和电流,计算出定直流电压站和首端整流站之间的压降。然后对定直流电压站的电压参考值进行修正,从而实现对首端整流站电压的精确控制。在此基础上,针对线路电阻变化或者未知的情况,又提出了一种自适应的稳态电压控制方法。最后利用实时数字仿真仪(RTDS)搭建了三端直流系统仿真模型,仿真结果验证了所提方法的正确性和有效性。In multi-terminal hybrid UHVDC transmission system, one task of the DC voltage station is to maintain the DC voltage of the head-end rectifier station at its set value. Line drop must be taken into account if the head-end rectifier station is not the DC voltage station and in such a case the traditional voltage margin control method and droop control method fail to achieve static error free control of the power and voltage. Based on the idea of a master-slave control method, this paper proposes a steady-state voltage control method for a multi-terminal hybrid UHVDC transmission system. First, the voltage drop between the DC voltage station and the head rectifier station is calculated based on system topology, line resistance and current. Then the control reference of the DC voltage station is modified to achieve precise voltage control of the head-end rectifier station. In addition, an adaptive method is proposed for the case where the line resistance is changing or totally unknown. Finally, a simulation model of three-terminal DC system using the real time digital simulator(RTDS) is built and simulation results demonstrate the correctness and validity of the proposed method.

关 键 词：特高压直流 多端混合直流输电系统 稳态电压控制 主从控制 线路压降 自适应 

分 类 号：TM721.1[电气工程—电力系统及自动化]