大规模风电直流送出系统过电压抑制措施及控制方案优化研究  

Transient Voltage Stabilization and Control Optimization for Large⁃scale Wind Power UHV DC Transmission System

作　　者：任冲 柯贤波 樊国伟[2] 刘旭晨 陆海洋 REN Chong;KE Xianbo;FAN Guowei;LIU Xuchen;LU Haiyang(Northwest Branch of State Grid Corporation of China,Xi’an 710048,China;Xinjiang Electrical Company,Urumqi 830002,China;NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]国家电网公司西北分部,西安710048 [2]新疆电力公司,乌鲁木齐830002 [3]南京南瑞继保电气有限公司,南京211102

出　　处：《高压电器》2020年第5期163-174,共12页High Voltage Apparatus

基　　金：国家电网公司总部科技项目(多直流群送端系统运行特性、耦合机理及评价指标研究);国家电网公司西北分部科技项目(西北电网大规模新能源和直流承载能力衡量指标体系研究)。

摘　　要：大规模风电特高压直流集中外送系统中,直流故障时由于扰动大且风电机组抗电压扰动能力差,暂态过电压问题突出,导致直流功率和新能源功率形成互相制约的矛盾关系,严重影响大规模风电特高压直流外送系统安全稳定运行和近区新能源消纳。为解决上述问题,提升大规模直流送出系统稳定水平及新能源消纳能力,分析了大规模风电直流送出系统电网暂态压升机理及影响过电压水平的因素,根据影响过电压水平的关键因素,提出利用风机过压保护差异性,允许部分风机高压保护动作脱网,利用直流FLC(Frequency limit control)功能及联切风电场电容器阻断大规模新能源连锁故障、优化风电机组无功控制特性等多项组合措施以降低过电压的思路。根据上述思路,以祁韶直流风电送出系统为研究对象,制定了直流近区新能源优化控制方案,仿真计算结果证明了文中所提思路的有效性。文中成果已经在祁韶直流运行控制中得到实际应用,有效提升了新能源消纳能力和系统稳定水平。In the large⁃scale wind power UHV DC centralized transmission system,the transient voltage rise problem is prominent due to the poor resistance of the wind turbine to voltage disturbance in DC fault condition,which leads to the contradiction between DC power and new energy power,and seriously affects safe and stable operation and near⁃field new energy consumption of the large⁃scale wind power UHVDC transmission system.Aiming at the above prob⁃lems,the Qi⁃Shao DC wind power transmission system was taken as the object to analyze the mechanism of transient voltage rise of the Qi⁃Shao DC wind power transmission system,and a number of measures were proposed and imple⁃mented,such as allowing partial high⁃voltage protection action of the wind turbine to be off⁃grid,using the FLC func⁃tion to block large⁃scale new energy cascading failures and to switch off wind farm capacitors in the case of failure,and optimizing the reactive power control characteristics of wind turbines.Based on these measures,an optimum con⁃trol scheme for DC near⁃zone new energy was established,which could help to boost the stability of large⁃scale DC power transmission system and the new energy utilization capability.This research has been applied to theoperation control of the Qi⁃Shao DC wind power transmission system,and has effectively improved the new energy consumption capacity and system stability level.

关 键 词：特高压直流 风电控制 直流故障 暂态过电压 直流FLC 

分 类 号：TM721.1[电气工程—电力系统及自动化]