交流电网互联的双端柔性直流输电系统小信号建模  

Small Signal Modeling for VSC-HVDC Used in AC Grid Interconnection

作　　者：杨洁[1] 刘开培[1] 余俞[1] 秦亮[1] 乐健[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072

出　　处：《中国电机工程学报》2015年第9期2177-2184,共8页Proceedings of the CSEE

摘　　要：小信号模型是稳定性分析及控制器设计的基础。对交流系统异步互联的双端柔性直流输电(voltage source converter based high-voltage dc,VSC-HVDC)系统小信号模型展开研究。通过同步旋转坐标系的灵活选择与转换,构建逆变器及所连交流系统、整流器及所连交流系统、控制器及直流线路的线性化方程,结合状态空间法,建立不受交流系统强度约束的双端柔性直流输电系统小信号模型。通过仿真对比,证明无论交流系统强弱,该小信号模型都能精确反映双端柔性直流输电系统的小干扰情况,具有普遍适用性。Small-signal model is the basis of stability analysis and control design. In this paper, the small signal model of voltage source converter based high-voltage dc （VSC-HVDC） used in AC gird interconnection was researched. By choosing d-q synchronous reference frame flexibly, the linear equation of rectifier and AC system, inverter and AC system, controller and DC line of VSC-HVDC was deduced. And Combined with the state space method, the small signal model of VSC-HVDC, which is not constrained by AC system strength is established. By comparing Electromagnetic transient simulation and the small-signal model simulation, the small-signal model can accurately reflect small interference of VSC-HVDC regardless of the strength of the AC system.

关 键 词：交流电网互联 电力系统 双端柔性直流输电 小信号模型 同步旋转坐标系 

分 类 号：TM721[电气工程—电力系统及自动化]