CAJ | 학술논문

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。
소신호모형시은정성분석급공제기설계적기출。대교류계통이보호련적쌍단유성직류수전(voltage source converter based high-voltage dc，VSC-HVDC)계통소신호모형전개연구。통과동보선전좌표계적령활선택여전환，구건역변기급소련교류계통、정류기급소련교류계통、공제기급직류선로적선성화방정，결합상태공간법，건립불수교류계통강도약속적쌍단유성직류수전계통소신호모형。통과방진대비，증명무론교류계통강약，해소신호모형도능정학반영쌍단유성직류수전계통적소간우정황，구유보편괄용성。
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 choosingd-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.