Research On Electric Spring Control Method Applied To New Energy Power Generation System

With its sustainability and cleanness,new energy power generation technology has become an important means to solve the problems of global energy demand and environmental governance.However,restricted by climate and other factors,its power generation capacity is intermittent and unstable.This characteristic will have a serious impact on the voltage quality of small microgrid,and even cause damage to important equipment.In order to deal with the inherent problems of new energy power generation,power spring technology is proposed.electric spring is a new type of power electronic device,which can effectively restrain the voltage fluctuation of load side caused by the change of power generation.At present,the power spring theory is in the primary stage of development,and the voltage stabilizing control method and active power compensation control method are not perfect.In this paper,ES-2 electric spring applied in AC microgrid is studied as follows:(1)Based on the improved cuckoo algorithm,this paper analyzes the influence of the main circuit parameters on the effective voltage regulation range of electric spring,designs reasonable main circuit parameters for the follow-up theoretical research and simulation experiments,and gives the installation strategy of electric spring in the practical application of microgrid At the same time,reasonable parameters of power spring device are designed;(2)Based on the s-domain circuit model of electric spring voltage stabilizing,the transfer function of electric spring voltage stabilizing is deduced;the dynamic and static characteristics of traditional PI control method under variable main circuit parameters are analyzed through system root locus and unit step response;an adaptive PI control algorithm based on RBF neural network and gradient descent method is proposed to improve the dynamic response of electric spring under variable main circuit parameters Speed,reduce the electric spring output voltage harmonics;(3)Based on the voltage regulation vector diagram of pure reactive power compensation,the phase control strategy of active power compensation for non critical load under different impedance properties is constructed;the influence of non critical load on the active power compensation range of intelligent load is analyzed by deducing and solving the mathematical equation of active power compensation;combined with the active power frequency modulation characteristics of traditional rotating power generation system,the influence of multi electric spring active power compensation on Microgrid system is discussed The influence of system frequency;(4)Finally,Matlab/Simulink simulation software is used to verify the proposed voltage effective compensation range analysis,electric spring adaptive rbf-pi control strategy and multi electric spring active power compensation method.The simulation results verify the correctness of the theoretical analysis and the effectiveness of the proposed method,and provide an effective guarantee for the in-depth study of electric spring technology.