Research On Optimal Sizing Method Of Wind-solar-Diesel-battery Microgrid System In Bawean Island

With the rapid development of social economic,people's demand for electricity continues to grow.While some islands and other remote areas are not connected to a large power grid,diesel power generation to meet part of the load demand,it's not only high cost and pollution of the environment,Bawean Island is a typical example in Indonesia.Wind-solar-diesel-battery microgrid system can effectively integrate the advantages of wind power,photovoltaic and diesel power generation,significantly improve the reliability of power supply,reduce power generation costs and emissions,is an effective complement to the traditional power grid.The optimal sizing of microgrid has important significance to the economics,reliability and environmental protection.This paper takes Bawean Island in Indonesia as an example to design the wind and light diesel storage micro-grid system,and uses HOMER software to simulate and optimize the configuration.The main research contents are as follows:Firstly,the structure of wind-solar-diesel-battery microgrid system,working principle and classification of wind turbine,photovoltaic,diesel and battery are introduced.And the power model classification of wind turbine,photovoltaic,diesel and battery are built.Then,the distributions of wind and solar resources in Bawean Island are analyzed.Present situation of generation,line and load are discussed.It provides the data support for the follow-up research on the optimal sizing of microgrid system.Bawean Island has no grid connection.Diesel generators are used to supply power to the islands.The power generation equipment is backward,the cost of power generation is high,and the load demand is large.It is urgent to build economical and environmentally friendly power generation equipment.The annual average wind speed on the island is 5.2m/s,and the annual average solar radiation amount is 1984kWh/m2.The wind and solar resources are abundant.Secondly,the micro-grid system structure of Bawean Island is designed,and the optimal arrangement of wind turbines and PV arrays are determined.The best types and specifications of wind turbines,PV modules and batteries were initially selected,500 kW wind turbines,high-efficiency single crystal silicon 295 Wp PV modules and the most economical lithium iron phosphate battery equipment.The control strategy that wind and solar as the main power,battery and diesel as the auxiliary power,make full use of renewable energy are designed.Finally,the program and sensitive factors were analyzed by HOMER software.Wind speed and fuel costs were identified as the most sensitive factors of the optimal sizing of the wind-solar-diesel-battery microgrid system.And the optimal sizing program of wind-solar-diesel-battery microgrid system in Bawean Island was obtained,installation of 295 Wp single crystal silicon module 3 067.36 kWp,500kW wind turbine 10 sets,diesel generator 3 700 kW,lithium iron phosphate battery 3 200 kWh,bidirectional converter 2 000 kW,under this configuration scheme,the total net cost of the system and the unit power supply cost is the lowest,They were 208.065 million yuan and 1.029 yuan/kWh.