交流故障下高压直流系统无功特性分析及无功控制策略研究  

Research on Reactive Power Characteristics Analysis and Reactive Power Control Strategy of HVDC System Under AC Fault

作　　者：何启皓 汪娟娟[1] 关晓羽 李欢 吴为 廖名洋 傅闯 HE Qihao;WANG Juanjuan;GUAN Xiaoyu;LI Huan;WU Wei;LIAO Mingyang;FU Chuang(School of Electric Power,South China University of Technology,Guangzhou 510641,Guangdong Province,China;State Key Laboratory of HVDC(Electric Power Research Institute of China Southern Power Grid),Guangzhou 510663,Guangdong Province,China;EHV Power Transmission Company Guangzhou Branch,China Southern Power Grid,Guangzhou 510663,Guangdong Province,China)

机构地区：[1]华南理工大学电力学院,广东省广州市510614 [2]直流输电国家重点实验室(南方电网科学研究院有限责任公司),广东省广州市510663 [3]南方电网超高压输电公司广州局,广东省广州市510663

出　　处：《电网技术》2024年第7期3023-3032,I0099-I0101,共13页Power System Technology

基　　金：国家自然科学基金项目(52277102)。

摘　　要：现有低压限流环节(voltage dependent current order limitation,VDCOL)使得高压直流系统的有功和无功强耦合,不能在交流故障持续及恢复过程中充分利用换流站自身的无功支撑能力来改善其恢复性能。该文以CIGRE HVDC标准测试模型与贵广Ⅱ工程模型作为算例,对两种模型交流故障下的直流电流及无功功率可运行范围进行了分析计算,并在PSCAD/EMTDC仿真程序中进行了验证;接着,对VDCOL的外特性进行了分析,结果表明其输出的直流电流指令不在所计算的可运行范围内;最后,采用了一种替换VDCOL的无功控制策略,该策略不仅能保证故障下直流两侧的控制指令位于可运行范围内,也能改善高压直流系统的故障恢复性能。VDCOL(voltage dependent current order limitation)strongly coupled the active and reactive HVDC systems.The reactive power support capability of the converter station cannot be fully utilized to improve its recovery performance during the AC fault duration and recovery process.This paper uses the CIGRE HVDC standard test model and the Guiguang II project model as examples.The operating range of DC and reactive power under the AC fault of the two models is analyzed and calculated.It is verified in the PSCAD/EMTDC simulation program.Then the external characteristics of VDCOL are analyzed.The results show that the DC command of VDCOL is not within the calculated operating range.Finally,a reactive power control strategy to replace VDCOL is adopted,which can not only ensure that the control instructions on both sides of the DC are within the operational range,but also improve the fault recovery performance of the HVDC system.

关 键 词：高压直流 无功功率 换相失败 交流故障 

分 类 号：TM721[电气工程—电力系统及自动化]