LCC-HVDC系统直流控制回路小干扰稳定性分析  

Small-signal Stability Analysis of DC Control Loop for LCC-HVDC System

作　　者：叶运铭 汪娟娟[1] 陈威 丁天皓 周盛宇 傅闯 YE Yunming;WANG Juanjuan;CHEN Wei;DING Tianhao;ZHOU Shengyu;FU Chuan(School of Electric Power,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of HVDC(Electric Power Research Institute of China Southern Power Grid Company Limited),Guangzhou 510663,China)

机构地区：[1]华南理工大学电力学院,广东省广州市510641 [2]直流输电技术国家重点实验室(南方电网科学研究院有限责任公司),广东省广州市510663

出　　处：《电力系统自动化》2021年第16期178-188,共11页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51777079);国家自然科学基金委员会-国家电网公司智能电网联合基金资助项目(U1766213);广东省自然科学基金资助项目(2020A1515011541)。

摘　　要：文中针对整流侧采用定直流电流控制策略、逆变侧采用定直流电压控制策略的电网换相换流器高压直流输电系统,基于状态空间模型的Laplace变换建立了线性化直流控制回路的传递函数模型;采用增益裕度、相位裕度和灵敏度函数最大峰值指标,定量评估了直流控制回路带宽、逆变侧锁相环带宽和逆变侧交流电网强度对各直流控制回路小干扰稳定性的影响;揭示了不同系统参数下各直流控制回路稳定裕度的具体变化规律。仿真结果验证了线性化传递函数模型及理论分析结果的正确性。In this paper,a transfer function model of linearized DC control loop is established based on the Laplace transform of the state space model for the line commutated converter based high voltage direct current(LCC-HVDC)transmission system with constant DC current control strategy on the rectifier side and constant DC voltage control strategy on the inverter side.Gain margin,phase margin and maximum peak value of sensitivity function are used to quantitatively evaluate the influence of DC control loop bandwidth,inverter-side phase-locked loop band width and inverter-side AC grid strength on the small-signal stability of each DC control loop.The specific variation rules of stability margin of each DC control loop with different system parameters are revealed.The simulation results verify the correctness of the linear transfer function model and the theoretical analysis results.

关 键 词：电网换相换流器 传递函数模型 单输入单输出 稳定裕度 定量分析 小干扰稳定 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM712