Research On Inverter Parallel Control Technology

With the gradual depletion of fossil fuels around the world,new energy technology has been an unprecedented development.Inverter technology as a new energy to solve the key equipment and network,with the relevant technology continues to in-depth study,more and more mature.Today's inverter applications tend to be more reliable,high-power transmission and other industries,and is currently limited by the development of power electronics devices in high-power inverter applications,the general bias in favor of the use of inverters Parallel technology,to achieve high-power and new energy grid.As the voltage amplitude,frequency and phase of AC power,the inverter parallel technology has become the focus and hotspot of power electronics research.Firstly,this paper introduces the background and development of the inverter technology,and analyzes the differences between the conventional control strategy and the control strategy of inverter,and the related application scenarios.The different modulation strategies and principles of inverters are introduced briefly.To establish a mathematical model of parallel inverter system based on droop control,according to the mathematical model of the inverter,controller calculates the voltage loop and current loop control strategy of inverter when the double closed-loop control parameters.According to the analysis,this paper establishes the simulation model of the inverter parallel system based on droop control.The equivalent output impedance of the inverter is analyzed in detail,and the circulation of the inverter parallel system is analyzed in detail.On the basis of the traditional droop control,a robust droop control strategy is studied,and the power allocation of inverter parallel system based on robust droop control is obtained.Finally,the simulation analysis of inverter parallel system based on robust droop control strategy is presented.Finally,A simple and practical parallel control strategy based on instantaneous average current feedback is studied.This paper analyzes the current characteristics of parallel inverter system,at the same time,adding the equivalent output impedance of the inverter instantaneous average current feedback analysis,and analyzes the current characteristics of the parallel inverter system,the control strategy based on the.Through simulation and experiment,the validity and practicability of the inverter parallel system based on instantaneous average current feedback control and its control strategy are verified.