改善局部电网暂态电压稳定特性的LCC-HVDC控制策略优化  

Optimization of LCC-HVDC Control Strategy for Improving Transient Voltage Stability Characteristics of Partial Power Grids

作　　者：朱益华 饶宏 郭琦 常东旭 曹润彬 陈雁 ZHU Yihua;RAO Hong;GUO Qi;CHANG Dongxu;CAO Runbin;CHEN Yan(State Key Laboratory of HVDC,China Southern Power Grid Electric Power Research Institute,Guangzhou 510663,China)

机构地区：[1]直流输电技术全国重点实验室(南方电网科学研究院有限责任公司),广州510663

出　　处：《高电压技术》2024年第7期2809-2819,共11页High Voltage Engineering

基　　金：国家重点研发计划(2021YFB2400900)。

摘　　要：随着广东电网负荷中心柔性互联工程的实施,电网分区间的交流联系变弱,大容量常规高压直流馈入的局部电网动态无功支撑能力下降,在逆变站近区严重交流故障冲击下可能暂态电压失稳。结合穗东换流站近区的暂态电压稳定问题,提出了优化直流低压限流控制(voltage dependent current order limiter,VDCOL)参数并附加限制直流功率上升速率的优化控制策略,设计了基于逆变站交流母线电压特征的控制策略自适应切换逻辑,有效减少了直流恢复过程中的无功消耗,达到以最小的控制代价实现最优控制效果的目的;基于实际电网运行方式和直流控制保护系统,仿真验证了所设计方案能显著提升换流站近区的暂态电压稳定性,并在一定程度上可减少交流系统故障后的直流换相失败。相关技术方案已在多个直流工程投入实际应用。With the implementation of the flexible interconnection project of Guangdong Power Grid Load Center,the AC connection between power grid partitions has become weaker,and the dynamic reactive power support capacity of local power grids fed by large capacity line-commutated converter HVDC(LCC-HVDC)has decreased.Transient voltage in-stability may be caused by severe AC fault impact in the near area of the inverter station.Based on the transient voltage stability problem in the near area of the Sui-dong converter station,this paper proposes an optimized control strategy for optimizing the voltage dependent current order limiter(VDCOL)parameters and attaching restrictions to the HVDC power rise rate,and an adaptive switching logic based on the AC bus voltage characteristics of the inverter station is de-signed.The method is adopted to effectively reduce reactive power consumption during the HVDC recovery process,achieving the goal of achieving optimal control effect with the minimum control cost.Finally,based on the simulation of the actual operation mode of the power grid and the HVDC control and protection system,it is verified that the designed scheme can be adopted to significantly improve the transient voltage stability in the near area of the converter station and to reduce the HVDC commutation failure after AC faults.The relevant technical solutions have been put into practical ap-plication in multiple HVDC projects.

关 键 词：高压直流输电 暂态电压稳定 动态无功支撑 换相失败 低压限流控制 自适应切换 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM712