交直流互联系统电压稳定性研究

摘要:

利用分岔理论对交直流互联电力系统电压稳定性进行分析。首先对交直流系统进行数学建模，给出系统、发 电机、励磁系统和直流系统数学模型表达式，利用连续潮流方法对系统平衡解流形进行追踪并求取分岔点． 通过考虑 直流电流参考值、励磁系统参考电压等系统参数对电压稳定性的影响，并利用实际WSCC9 节点系统进行验证分析。 最后通过时域仿真的方法还初步探讨了直流输电线路对整流侧和逆变侧电压的影响。

Abstract:

The voltage stability of AC/DC interconnected power system is analyzed with bifurcation theory． Firstly，the mathematical modeling of AC/DC system is done，and the mathematical expressions of system，generator，excitation system and DC system are given． The continuation power flow method is used to track the equilibrium solution manifold of the system and get the bifurcation point． Considering the influences of system parameters on the voltage stability such as DC reference current， the reference voltage of excitation system，it is verified with the actual WSCC9 system． Finally，the influence of DC transmission line on the voltage of rectifier side and inverter side is discussed with time domain simulation method．