基于状态方程的高压直流换流器直流回路阻抗计算及直流谐振抑制  

DC Loop Impedance Calculation and DC Resonance Suppression of HVDC Converter Based on State Equation

作　　者：李欢 辛清明 傅闯 赵晓斌 许树楷 LI Huan;XIN Qingming;FU Chuang;ZHAO Xiaobin;XU Shukai(State Key Laboratory of HVDC,Electrical Power Research Institute,CSG,Guangzhou 510663,China)

机构地区：[1]直流输电技术国家重点实验室(南方电网科学研究院),广州510663

出　　处：《南方电网技术》2021年第8期40-47,共8页Southern Power System Technology

基　　金：中国南方电网有限责任公司科技项目(ZBKJXM20190056);国家自然科学基金(51777079)。

摘　　要：基于状态方程的方法建立了高压直流换流器直流回路谐波阻抗的解析计算方法,采用MATLAB和PSCAD/EMTDC软件对直流谐波阻抗进行了建模和仿真计算,验证了所提方法的正确性,得到了换流器直流谐波阻抗的典型频谱。分析了直流谐波阻抗频谱与各控制参数的耦合关系,提取了影响直流谐波阻抗的关键控制参数,形成了基于控制参数调制的直流谐波阻抗调整和直流谐振抑制的方法,提升了高压直流换流器抑制直流谐振问题的效率和灵活性。Based on the state equation method,an analytical calculation method for the DC loop harmonic impedance of the HVDC converter is established.MATLAB and PSCAD/EMTDC software are used to build model and simulate the DC harmonic impedance to verify the correctness of the proposed method.The typical frequency spectrum of the DC harmonic impedance of the converter is obtained.The coupling relationship between the DC harmonic impedance spectrum and the control parameters is analyzed,and the key control parameters that affect the DC harmonic impedance are extracted,and a DC loop harmonic impedance adjustment and DC resonance suppression method based on control parameter modulation is formed.The efficiency and flexibility of DC resonance suppression of the converter have been improved.

关 键 词：高压直流换流器 直流回路阻抗 直流谐振抑制 状态方程 

分 类 号：TM721.1[电气工程—电力系统及自动化]