考虑直流闭锁暂态过电压约束的送端电网换流站高效无功规划  

Efficient Reactive Power Planning of Converter Station in HVDC Sending System Considering HVDC Blocking Transient Overvoltage Constraint

作　　者：赵溶溶 柯德平[1] 孙元章[1] 徐箭[1] 常海军 刘福锁 ZHAO Rongrong;KE Deping;SUN Yuangzhang;XU Jian;CHANG Haijun;LIU Fusuo(School of Electrical and Automation,Wuhan University,Wuhan 430072,China;NARI Group Coporation,Nanjing 211006,China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072 [2]南瑞集团公司,南京211006

出　　处：《南方电网技术》2022年第7期10-21,共12页Southern Power System Technology

基　　金：国家自然科学基金资助项目(51777143);国家电网公司总部科技项目(5229DK19000X)。

摘　　要：特高压直流闭锁故障引起的送端电网暂态过电压问题可能会威胁跨区大容量远距离输电的安全。目前,换流站内配置调相机是公认的能可靠解决上述问题的手段之一。为从经济性角度协调规划送端换流站滤波电容器和调相机容量,本文首先分析调相机抑制直流闭锁送端电网暂态过电压的机理,然后进一步提出基于次暂态潮流的直流闭锁瞬间换流母线暂态电压计算方法,并将这种代数解析计算方法应用于换流站滤波电容器和调相机的协调无功规划,以满足换流站正常稳态运行和闭锁故障后电压控制需求。最后利用仿真结果验证本文所提暂态电压计算方法以及相应的协调无功规划方法的高效性和准确性,同时说明换流站滤波电容器与调相机协同实现电压管控的经济性。The transient overvoltage problem of HVDC sending system caused by HVDC blocking fault may threaten the safety of the large-capacity and long-distance transmission across regions. At present, the configuration of synchronous condenser in converter stations is recognized as one of the means to reliably solve the above problem. In order to coordinate the planning of capacitor and synchronous condenser in converter station from the perspective of economy, this paper firstly analyzes the mechanism of suppressing transient overvoltage caused by HVDC blocking fault using synchronous condenser. Furthermore, this paper puts forward a transient overvoltage calculation method of converter bus based on sub-transient power flow, and applies this algebraic analytical cal-culation method to the coordinated planning of capacitor and synchronous condenser capacity in converter station to meet the voltage control requirements during normal steady-state operation and after HVDC blocking fault. Finally, the simulation results verify the efficiency and accuracy of the transient overvoltage calculation and the corre-sponding reactive power planning methods proposed in this paper, and at the same time illustrate the economy of voltage management and control realized by the cooperation of capacitor and synchronous condenser in converter station.

关 键 词：直流闭锁 暂态过电压 同步调相机 无功规划 

分 类 号：TM721[电气工程—电力系统及自动化]