Research On Coordinated Control Of Diesel Generator And Battery Energy Storage System Based On Independent Microgrid

With the continuous progress of the social development,some important occasions in the human production and daily life,need to provide uninterrupted power supply system,so the power supply mode of single power supply has been difficult to meet the requirements of human production and life.In addition,due to the development of human beings do not re emphasis on the protection of the production concept,coal and other fossil fuels are a large number of human waste,the number has become increasingly scarce,and the natural environment has suffered serious damage.These resources and environmental issues have led to the transformation of new energy sources,so clean,pollution-free,renewable energy sources have received great attention.However,due to the influence of weather,climate and geographical environment,the randomicity and intermittence of the renewable natural resources seriously affect the power quality and reliability of the power supply system.Therefore,people can consider a variety of natural resources and distributed energy,through the coordination of the relationship between the control of them,to achieve a variety of complementary resources to ensure continuity of power supply,while improving the quality of power supply.The diesel generator with the advantages of flexibility,convenience,and operation at any time,and the battery energy storage system which can quickly respond to the change of power are undoubtedly the best choice.The batteries and diesel generators equipped with the appropriate number,when natural energy power is insufficient,can input system quickly,ensure the normal and stable operation,can ease the intermittent natural resources and stochastic problems.This paper introduces the mathematical model of diesel generator and basic composition of the link,and completed in MATLAB/Simulink to build on these models,focuses on the analysis of a fuzzy Smith-PID predictive control algorithm to compensate control system,and through the simulation load suddenly increased or decreased the output waveform,the speed,voltage and current are obtained.The results show that the speed control system can effectively improve the dynamic response and anti-interference of the system.According to the size of the system load,the author analyzes the operation mode of the diesel generator and the battery in different working states of the system Firstly,the mathematical model of three-phase inverter is derived,and its control algorithm is studied.Then,by using the principle of coordinate transformation and instantaneous reactive power,the decoupling control of active power and reactive power is realized by SVPWM space vector method.The simulation results show that the controller can coordinate the energy flow of the diesel engine and the battery,and ensure the normal operation of the system.Finally,the auxiliary power regulation of the battery energy storage system in the power supply of two diesel generators is simulated.To build an experimental platform of control system in the laboratory,including a prototype simulation of small power diesel generator combined with photovoltaic panels and battery output and load system composed of main circuit,and the simulation of diesel engine parameter acquisition actuator,detection circuit,control circuit,operation circuit and related protection circuit,and each part of the the hardware debugging,to ensure the reliable and stable operation.The main program of the simulator,the main program of the system controller,the program of executing the program and the subroutine of the program are compiled on the program compiling platform.Finally,the experimental results are analyzed to prove the feasibility of the proposed control system.