New Energy Distributed Generation And Its Optimal Control Technology

New energy is widely distributed,clean and non-polluting to the environment,especially the large-scale development and utilization of new energy based on wind energy and solar energy has become a hot research area.However,wind and solar power generation are constrained by the environment,the output power is unstable and can not meet the requirements of power supply,and even threaten the safe operation of the power grid.According to the natural complementary characteristics of wind and solar power generation,and configuring a certain capacity of energy storage devices,the construction of distributed generation system can effectively smooth the output power and improve the quality of power supply.Firstly,combining the space-time endowment characteristics of wind energy,solar energy and energy storage system,the mathematical models of wind power,photovoltaic power generation system and hybrid energy storage system are built and their operation characteristics are analyzed.Then,the paper makes a thorough study on the hybrid energy storage design,maximum power tracking technology and grid-connected inverter control of distributed generation system.The control method of hybrid energy storage system composed of supercapacitors and lead-acid batteries is designed in this paper,which improves the overall performance of energy storage system and prolongs its service life.This paper studies the maximum power point tracking technology of composite method for distributed generation system,which has the advantages of fast tracking speed,high tracking accuracy and not easy to misjudge the tracking direction.In this paper,the control technology of grid-connected inverter based on virtual synchronous generator is proposed.The pre-synchronization technology is used to control the grid-connected frequency and voltage,and the seamless switching between islanding state and grid-connected state of distributed generation system is realized.Finally,the simulation results show that the proposed control method can optimize the operation characteristics of distributed generation system,improve the system stability and output power quality.