Research On Disturbance Compensation Control Of Paralleled Inverters In Microgrid Based On Data Driven

With the increasing demand for energy and the increasingly serious environmental pollution in today’s society,the proportion of renewable energy such as solar energy and wind energy in the world has been gradually increasing,which makes the distributed generation technology get large-scale application.As the core component of distributed generation,the control of inverter is important.In this paper,the paralleled inverters in microgrid are taken as the research object,the shortcomings of the existing droop control methods are analyzed and discussed,a novel distributed model-free adaptive control algorithm with disturbance compensation is established to ensure the stable operation of the paralleled inverters system.The main work of the thesis is as follows:Firstly,the importance of the control to paralleled inverters in microgrid and the problem of the existing control methods are analyzed.The droop control based on the mathematical model of inverter has the high requirements of droop coefficient when controlling each inverter to output the same voltage,and the double loop control of voltage and current has a strong dependence on the parameters of the inverter itself.At the same time,the research and application of data driven control in power electronic device control is introduced,which provides theoretical basis for the model free adaptive control strategy of microgrid paralleled inverters.Secondly,due to existence of unknown disturbance in inverter,a model-free adaptive voltage control algorithm based on disturbance compensation is proposed to control the output voltage of the inverter.The dynamic varying parameters are introduced to linearize the inverter system.Meanwhile,a new disturbance compensation voltage controller is designed and its stability is analyzed.The design process of the control method only needs the input and output data of the system,and it does not need to establish an accurate mathematical model of the system,therefore it greatly reduces the control difficulty.Simulation results show the effectiveness of the proposed method.Finally,a novel distributed model-free adaptive control algorithm with disturbance compensation is proposed to realize the voltage cooperative control of the paralleled inverters,which effectively suppresses the loop current.Then,the stability analysis is given.Then,the effectiveness of the proposed method is illustrated by simulation.