Research On Control Strategy Of Static Synchronous Series Compensator Based On Active Disturbance Rejection Theory

As the latest generation of flexible AC transmission system(FACTS)equipment,Static Synchronous Series Compensator(SSSC)has the characteristics of high control precision,fast response and excellent dynamic performance.By controlling the voltage generated by the inverter and the controllable voltage,the energy exchange with the power grid can quickly,effectively,flexibly and accurately regulate the equivalent impedance of the transmission line and increase the transmission power limit of the AC system.Improve the stability of the operation.However,the controller is not affected by the accuracy of the mathematical model and the multi-parameter changes.Therefore,this paper studies the SSSC control strategy,and based on this,it proposes an auto disturbance rejection controller(Auto disturbance).Improvement of the rejection controller,ADRC).In this paper,based on the simple two-machine power system,the working principle and working characteristics of SSSC are analyzed in detail,and the theoretical model of SSSC system is derived based on its mode of action in power flow control.In order to design the SSSC controller,this section establishes the state equation under the synchronous rotation d-q coordinate system based on the original mathematical model.Secondly,in view of the slow response speed,simple parameters and difficult regulation of complex systems in traditional PI control,this paper proposes a control method based on auto-disturbance control theory for static synchronous series compensation device and SSRC based on ADRC.The controller was designed to improve power system transient control performance and dynamic tracking performance.Finally,based on the controller model of the above design,this paper builds it with MATLAB/SIMULINK module and simulates it.The simulation results show that compared with the static synchronous series compensator under the traditional PI control strategy,the improved controller designed in this paper has faster response speed,smaller overshoot,smoother output waveform,and significantly improves the tracking performance of the system..