Research On Model Predictive Control Strategy Of Photovoltaic Inverter

With the development of human science and technology,the use of primary energy is also greatly improved,resulting in a large number of non renewable energy shortage.Therefore,the development and utilization of clean energy has become the focus of human research.In the process of development and utilization of many clean energy,the renewable energy based on wind energy and solar energy has shown great advantages and become the current clean energy main research objects.In terms of the utilization of light energy,the research on photovoltaic inverter is inevitable.Nowadays,there are various control strategies for photovoltaic inverter.This paper proposes an improved model predictive control strategy to realize the control of photovoltaic inverters.Compared with the traditional model predictive control strategy,it improves the static stability of the three-phase inverter,reduces losses and improves work efficiency.The main contents of the paper include:(1)A detailed theoretical description of the more typical direct current model predictive control in the three-phase inverter model predictive control.The basic principles of model predictive control,the establishment of mathematical models of three-phase inverters,the setting of cost functions,and the establishment of load models show the current general model predictive control models.The advantages and disadvantages of the control strategy;(2)Based on the traditional three-phase inverter model predictive control,the direct current predictive control is improved by introducing a mathematical algorithm called the spherical decoding algorithm to solve the problem of the traditional model predictive control in the multi-step model predictive control The problem of exponential increase in calculation difficulties caused by And conduct a detailed analysis of the working conditions of the improved control strategy,and explore its selection of the optimal switching sequence;(3)Through the simulation of the system in Matlab / Simulink,the optimal operation parameters are determined,and the feasibility of the control strategy is verified.By comparing the experimental results with the traditional strategy,it is proved that the improved control strategy can shorten the calculation time and reduce the computational complexity in the process of obtaining the optimal switching sequence.The THD can be reduced by 2.86%,the current distortion rate can be reduced,and the steady-state performance and working efficiency of the inverter can be improved.Based on MATLAB / Simulink simulation,the feasibility of the control strategy is verified.