联接弱交流电网的VSC-HVDC系统功率耦合特性及解耦策略  

Power Coupling Characteristics and Decoupling Strategy of VSC-HVDC System Connected to Weak AC Power Grid

作　　者：邵冰冰 赵书强[1] SHAO Bingbing;ZHAO Shuqiang(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Baoding 071003,Hebei Province,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学)

出　　处：《电网技术》2019年第12期4532-4540,共9页Power System Technology

基　　金：河北省自然科学基金(E2017502075);中央高校基本科研业务费专项资金资助(2018QN079)~~

摘　　要：针对联接弱交流电网的柔性直流输电系统的功率耦合问题,通过研究整流站/逆变站输出有功、无功和端电压幅值与注入电网的d、q轴电流间的线性化关系,揭示了弱交流电网下柔性直流输电系统的功率耦合特性,并提出一种功率解耦算法。最后,在PSCAD/EMTDC中搭建了联接弱交流电网的柔性直流输电系统仿真模型,通过仿真验证了功率的耦合特性。同时,与静态前馈补偿解耦算法和传统矢量电流控制算法相比,所提出的动态前馈补偿解耦算法具有更好的解耦效果。In view of the power coupling problems of voltage source converter based HVDC(VSC-HVDC) transmission system connected to weak AC power grid, the power coupling characteristics in the system were revealed by studying the linearized relationship between the active power, reactive power, terminal voltage amplitude and d-, q-axis current of rectifier/inverter, and a decoupling algorithm was proposed. Finally, a model of VSC-HVDC connected to the weak AC power grid was built in PSCAD/EMTDC, and the coupling characteristics of power are verified. The proposed dynamic feed-forward compensation decoupling algorithm is proved with better decoupling effect compared with static feedforward compensation decoupling algorithm and traditional vector current control algorithm.

关 键 词：柔性直流输电系统 弱交流电网 功率耦合特性 动态前馈补偿 

分 类 号：TM721[电气工程—电力系统及自动化]