Research on Voltage Stabilization Method of Power System with Constant Power Load

In order to solve the phenomenon of bus voltage resonance instability caused by the negative impedance characteristics of constant power load in DC power system, a sliding mode controller based on overtorsion algorithm was designed. Firstly, the space state equation of the converter is derived according to the switching state of the converter, and a sliding surface is created using the error between the inductor current and the output voltage of the converter. Then, the convergence and stability of the sliding mode are judged by combining the super twisting algorithm with Lyapunov theorem. Finally, the simulation software Matlab/Simulink is used to verify the controller. The experimental results show that the controller has a robust and fast dynamic response to the external interference of the load side and the source converter side.