Study On Power Network Simulator Based On Fuzzy PI Sliding Mode Control

As more and more wind power generation system power grid,the power supply company to power grid for wind power generation system,more and more strict requirements,which requires wind power system in the power grid failure,can continue to parallel operation and active reactive power support grid,so the operation situation of wind power generation system under the fault is particularly important.Since the primary goal of the grid is to provide standard three-phase sinusoidal voltage,it is difficult to generate various forms of grid fault for equipment testing,so the study of grid simulators capable of simulating various faults of the grid becomes particularly important.This paper analyzes the functional requirements and topology structure of the power grid simulator,and studies and improves its control strategy.The specific research contents are as follows:First of all,The main functional requirements of the power network simulator are summarized,including simulating normal power network voltage,three-phase voltage imbalance,waveform distortion,voltage amplitude mutation and voltage frequency mutation.The topology of power network simulator is analyzed and the suitable topology of power network simulator is selected.Secondly,Of three-phase voltage source PWM rectifier current inner loop and voltage outer loop PI design,in view of the traditional PI parameters are fixed,large disturbance effect is very bad shortcomings,puts forward voltage outer loop adopts piecewise fuzzy PI control,the current inner ring USES the adaptive control strategy of fuzzy PI control,and build a Simulink model,the system response speed,anti-interferenceperformance simulation.Thirdly,In the control of single-phase full-bridge inverter,an improved bipower approximation law is proposed for chattering problem in sliding mode control,and its performance is simulated and verified.The mathematical model of single-phase full-bridge inverter is established,its controller is designed according to the improved sliding mode control,and the simulation model is built by Simulink to verify the ability of improving sliding mode control to eliminate chattering.Above all,Based on the study of power network simulator rectifier and inverter,the simulation model of power network simulator is built based on Simulink,and simulation verification is conducted according to the functional requirements of power network simulator.According to the design method of dSPACE hardware system and software system,the experiment platform of power grid simulator based on dSPACE is built to verify the effectiveness of the power grid simulator studied in this paper.