Research On The Influence Of Asynchronous Condenser On The Stability Of Wind Power Generation

With the proposal of the national double carbon goal,the proportion of new energy power generation increases year by year.The uncertainty of new energy power generation system is strong and the reliability is low.The high proportion of power electronization leads to its small inertia and easy to be affected by faults.Therefore,how to improve the inertia of new energy power generation system has become a research hotspot.Asynchronous condenser has the advantages of fast response,small floor area and low cost.Because it can not only emit a large amount of reactive power in a short time,but also improve the system inertia,it has unique advantages in supporting the stability of new energy power system.Firstly,the mathematical model of asynchronous condenser is established,and the principles of reactive power compensation and frequency support are analyzed.Secondly,the excitation system model which can realize the approximate decoupling of active and reactive power is established.On this basis,the transient mathematical model considering the change of stator voltage is established,and the transient control strategy considering the change of stator excitation current is proposed.Considering the possible asymmetric faults in the power grid,an asymmetric fault model is established,and the proportional integral resonance control is used to replace the traditional PI control to suppress the frequency doubling component of the condenser due to the voltage imbalance in the power grid.Finally,a high proportion of new energy area in Heilongjiang is modeled,and a simplified model is established by equivalent aggregation to analyze the impact of the condenser on the high proportion of new energy grid.Using this model,the reactive power compensation ability and frequency support ability of the condenser installed in different locations of the wind farm for faults in the wind farm,parallel outlets and outlet lines are analyzed.Capacitor and condenser are installed respectively to compare the overvoltage suppression effect of condenser on wind power off grid.Then,the influence of the installation of asynchronous condenser in the new energy stations of the whole power grid on the stability of new energy power grid with different proportion permeability is analyzed.