以直流逆变站为动态无功源的暂态电压稳定控制  

Transient Voltage Stability Control Based on the HVDC Inverter Station Acting as Dynamic Reactive Source

作　　者：郑超[1] 马世英[1] 盛灿辉[1] 郭小江[1] 杨海涛[1] 傅旭[2] 刘洪涛[3] 林俊杰[1] 秦晓辉[1] 刘道伟[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]西北电力设计院,陕西省西安市710015 [3]中国南方电网电力调度控制中心,广东省广州市510623

出　　处：《中国电机工程学报》2014年第34期6141-6149,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51207143);国家电网公司大电网重大专项资助项目课题(SGCC-MPLG001-2012)~~

摘　　要：受特高压直流送电容量大、多直流密集落点以及负荷高密度分布等因素影响,受端电压稳定问题已成为威胁电网安全稳定运行和制约负荷接纳能力的重要因素之一。通过逆变器准稳态模型,解析其无功消耗与送电有功间的强关联特征;通过时域仿真,明晰逆变器无功消耗与容性补偿器无功出力动态差异,明确该差异可使逆变站成为动态无功源,即直流有功回降后逆变站可向交流电网注入动态无功。在此基础上,提出改善受端电网电压稳定性的直流紧急控制启动判据和撤销判据,以及具备在线应用前景的基于逆变站换流母线电压受扰轨迹的直流紧急控制策略。呼盟—豫西?800 k V/8 000 MW特高压直流受端电网大扰动时域仿真结果,证实了所提控制策略是提升受端电网电压稳定性和规避切负荷的经济有效措施。Due to the transmission capacity of ultra high-voltage direct current （UHVDC） increasing, intensive HVDC inverter stations located and load high-density accessing, voltage stability has become one of the important factors of threating to the security and restricting the ability to accept loads for the receiving end power grid. In this paper, the relationship between reactive power and active power was analyzed based on the quasi-steady-state analytical equations of inverter firstly. Time domain simulations show the dynamic difference between inverter consumption and capacitor bank exportation of the capacitive reactive power, so the inverter station can be as dynamic reactive power source to improve the voltage stability of the receiving end power grid by HVDC power backing down. The start criterion and the revocation criterion of HVDC emergency power control were put forward, and based on the disturbed trajectory of commutation bus voltage at inverter station, the control strategy with online application prospects was also proposed. Large disturbance time-domain simulation results got from the receiving end power grid of Humeng-Yuxi ＆#177;800 kV/8 000 MW UHVDC transmission system verified the recommended control strategy is a cost-effective measure to enhance the voltage stability level and to circumvent load shedding.

关 键 词：逆变站 动态无功特性 电压稳定 逆变器 容性补偿器 受扰轨迹 控制判据 紧急控制策略 

分 类 号：TM71[电气工程—电力系统及自动化]