含大规模风电的电力系统分岔与电压稳定性研究

Research on Power System Bifurcation and Voltage Stability Including Large-scale Wind Generators

双馈式风力发电系统是一个多变量、非线性、强耦合的系统并且比传统发电系统更为复杂。建立双馈式风力发电机的两质块轴系模型,考虑动态负荷的作用,使用AUTO 07研究在不同风速情况下,系统无功功率q0与动态负荷节点电压UL之间的关系,求出系统的分岔曲线。分析系统中对应于鞍结分岔点和Hopf分岔点处系统的运行状态,从而验证电压失稳的动力学本质。最后,得出发电机电阻变化条件下,旋转角速度ωr和发电机控制系数Kpω之间的Hopf分岔边界,证明系统参数的变化会对稳定性产生影响。仿真结果验证了理论研究的正确性和合理性。

The DFIG system is a multivariable,nonlinear,and strongly coupled system and is much more com-plicated than a traditional generation system. Two-mass shaft model was established by considering the role of dynamic load. The so-called bifurcation curve about the relation between system reactive power and voltage of dynamic load was obtained,which used AUTO 07 and considered the different wind speed. The system running state of saddle node bifurcation point and Hopf bifurcation point was analyzed, then the nonlinear dynamics point of view was verified. Finally,the Hopf bifurcation boundary between rotation angular ωr and controlling coefficient that with the changing of resistance was given,it means that the system parameter can affect the sta-bility. Simulation is conducted to demonstrate the validity and rationality of the proposed theoretical research.