基于可控电压源-电流源型混合直流系统的协调控制策略  

Coordinated Control Strategy Based on Controllable Voltage Source-Current Source Hybrid HVDC Transmission System

作　　者：熊耀 魏晓光 汤广福 江淘莎 张闻闻 李松 杜蕙 张杰 王以璇 齐磊 Xiong Yao;Wei Xiaoguang;Tang Guangfu;Jiang Taosha;Zhang Wenwen;Li Song;Du Hui;Zhang Jie;Wang Yixuan;Qi Lei(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing,102206,China;Beijing Huairou Laboratory,Beijing,101400,China)

机构地区：[1]新能源电力系统全国重点实验室(华北电力大学),北京102206 [2]北京怀柔实验室,北京101400

出　　处：《电工技术学报》2025年第7期2095-2111,共17页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2023YFB2405900)。

摘　　要：可控电压源-电流源型混合直流输电系统是一种适用于大规模清洁能源送出场景的新型直流系统。针对可控电压源-电流源型混合直流输电系统暂态工况下运行特性提升问题,该文建立了可控电压源-电流源型混合直流输电系统数学模型,以刻画混合直流系统暂稳态工况下直流电压、电流和功率运行特性;分析了可控电流源型换流器无功功率与相位差和直流电流的变化关系,进而提出受端交流故障下提升混合直流系统无功支撑能力的实现方法;通过引入故障检测判据并考虑送受端通信延时,提出一种附加有功电流和无功功率控制模块的协调控制策略。仿真结果表明,所提控制策略在受端弱电网场景中,有效地减少了故障期间交流电压跌落量,实现了对受端电网的无功支撑,并且降低了故障期间直流电压跌落和线路过负荷水平,进而提升了混合直流系统的运行性能。To ensure the efficient transmission of new energy from the desert and gobi Regions,China has accelerated the construction of ultra-high voltage direct current(UHVDC)transmission corridors.A large number of UHVDC projects are being arranged,deployed and continuously promoted.The controllable voltage source-current source type hybrid DC delivery scheme not only provides frequency reference and voltage support,but also has low cost,low loss,high reliability,and no phase change failure problem,so it is more suitable for large-scale clean energy delivery scenarios with complex and changing operating conditions.However,how to improve the active support capability of the converter at the sending and receiving ends after an AC fault occurs in the hybrid DC system to ensure efficient and reliable clean energy delivery and safe and stable operation of the system is still a difficult problem that needs to be solved urgently.Firstly,a mathematical model of controllable voltage-current source hybrid DC transmission system is established to depict the DC voltage,current and power operation characteristics of the hybrid DC system under the transient steady state condition.Secondly,the reactive power of the controllable current source converter is analyzed in relation to the phase angle difference and the direct current,and then a method is proposed to improve the reactive power support capability of the hybrid DC system under the AC fault at the receiving end.Thirdly,by introducing an additional active current control module based onΔivd-ΔP slope control and an additional reactive power control module,the line overload level under the AC fault condition and the voltage drop during the fault period are effectively reduced,and the reactive power support to the receiving end grid is realized,which improves the operational performance of the hybrid DC system.Finally,the correctness and effectiveness of the proposed control strategy are verified by simulation with electromagnetic transient simulation software PSCAD/EMTDC.The prop

关 键 词：混合直流系统 协调控制 暂态工况 故障特性 

分 类 号：TM721[电气工程—电力系统及自动化]