Application And Analysis Of The Fast MPC Algorithm In Photovoltaic Inverter System

Energy is the foundamental material for human living and industrial manufacture.Solar energy,as one kind of the renewable green energy,has attracted more and more attention and research.Since inverter is the most significant part in PV inverter system,the research about its control method and control theory has consequently been paid extensive attention by worldwide scholars.In recent years,Model Predictive Control(MPC)has been widely applied in various fields especially in industrial fields for its valid capability of handling constraints and excellent control effect.However,the receding horizon optimization feature of MPC has impeded the application of MPC in high-speed system especially in electrical system because of the high online computational complexity.The algorithm of Fast MPC has observably improved the online computational efficiency,therefore it provided a feasibility of applying MPC in PV inverter system.Based on Fast MPC Algorithm,this paper studied the algorithm's applicaton in grid-connected inverters,generalized the algorithmic application in joint modeling of PV inverter system,and established the micro-grid platform on the basis of theoretical research.The main work of this paper are as follows:1)Accomplished the modeling and simulation of grid-connected three-phase inverter and single-phase inverter.Combined with the Fast MPC Algorithm,finished the modeling of grid-connected three-phase inverter and single-phase inverter by means of analyzing the circuit structure of inverters.And established the simulation environment under MATLAB/Simulink,then carried on the simulation for algorithmic verification.2)Finished grid-connected experiment of three-phase inverter and single-phase inverter with DSP platform.On the basis of the simulation,designed and implemented the inverter MPC controller.Carried on the grid-connected inverter experiment and achieved good control result.Consequently,further verified the feasibility of applying the Fast MPC Algorithm in inverter system.3)Studied the modeling and simulation of the joint model of inverter system.For the purpose of reducing the capacity of the bus capacitance,studied a method of joint-modeling the inverter system.Established the simulation environment of the joint model,controlled it with MPC algorithm and achieved good control effect.4)Established the micro-grid platform.Accomplished a whole procedure of establishing the platform,the procedure mainly contains the following parts: designed the topological structure,selected the platform facility,attached the platform device,then tested the device,after that,operated the platform and finised some experiment on the platform.