Control strategy of SMES converter based on dynamic evolution theory

The converter and its control method in SMES(Superconducting Magnetic Energy Storage) have a great impact on the energy storage efficiency and reliability operation of SMES. The traditional PI(Propor-tional Integral) control methods are difficult to set the parameters and easy to overshoot,which cannot be applied to complex nonlinear system. Therefore,a DEC(Dynamic Evolution Control) method is proposed,which is a nonlinear control strategy. The main idea is to force the error function to approach 0 with time according to the evolution path,which effectively improves the stability and robustness of SMES system during operation. The effectiveness of the proposed control method under different examples is verified in MATLAB/Simulink,and simulative results show that the proposed method has the characteristics of fast response speed,strong robustness and high stability. © 2019, Electric Power Automation Equipment Press. All right reserved.