Research On Micro-network Energy Storage System Control With Distributed Power Supply

In the current growing demand for energy,air quality problems have become increasingly prominent,the environmental problem has gradually become the social background of international trade barriers implicit,how safe and efficient development of renewable energy,especially wind power and solar power and other clean energy has become an urgent task.As a relatively independent small power distribution unit,microgrid can greatly alleviate the problem of grid connected distributed generation(DG)technology.In order to make the safe and stable operation of microgrid,a microgrid to access storage system(ESS),power supply for the important load in microgrid in order to protect the main fault.This paper mainly studies the control technology of micro grid energy storage system,researched and on this basis,namely to build a wind turbine,photovoltaic array and hybrid energy storage system model,to achieve maximum power point tracking for renewable energy generation respectively on the wind turbine variable step hill-climbing search method and PV array admittance increment was studied.In this paper,it is necessary to analyze the theoretical basis of the energy shaping control method,and put forward the idea that the energy storage system can be controlled from the energy point of view.In this paper,a port Controlled Hamiltonian(PCH)model is established for islanding operation of energy storage system.Based on the PCH model,the energy shaping controller of the energy storage system is designed by means of damping injection and interconnection matrix design.Simulated by MATLAB/simulink simulation software,the control method of energy shaping and traditional PI control methods are compared and analyzed by simulation based on the energy shaping method in island operation effectiveness and feasibility.The simulation results show that the control performance of PI is better than that of energy shaping control under grid connected condition.The simulation results show that the control performance of PI is better than that of the control system.And the further analysis of the energy storage system in the storage power allocation,through the low pass filter into the system,optimize the energy storage system configuration,and the low pass filter is introduced after the PI is used to control the storage system to do simulation.