Micro-grid Operation Optimization Strategy Based On Evaluation Of Economic Benefit

Recently,along with the continued and fast development of our country’s economy,the rapid increase of modern power demand has brought problems such as energy shortage,environmental pollution and aging of power system.It makes the security and stability of power grid operation,adjustment and optimization of the energy using structure,the construction of renewable energy system have become the main trend of development nowadays.As an effective carrier of distributed energy,the micro-grid,can not only promote the traditional energy and renewable energy cascade utilization,improve grid power system stability,but also have high economic benefit in the process of operation,therefore it has obtained the widespread applications.Firstly,this paper introduces the structure of the micro-grid,energy management mode and its operation mechanism and development status at home and abroad.It also makes detailed studies and analysis about the application of distributed energy system of micro-grid in China,as well as the advanced energy management methods and micro-grid operation modes.Secondly,according to characteristics of internal power generators,their working principles and the operation cost are mathematically described and the power of renewable energy generators are predicted;further,based on considering the operation cost of all kinds of equipment and the optimization problem with safe operation as the constraint conditions,this paper establishes economic efficiency as objective function to obtain the isolated network-connected mode switching strategy which is the optimal operation mode of the micro-grid in hour(grid connected or isolated network mode).The economic and security of the mode switching strategy are simulated by using genetic algorithm on the MATLAB platform,and the results show that the proposed switching strategy can save the cost of operation and guarantee the security and stability of the micro-grid.Finally,based on hourly optimal operation mode,combining with the characteristics of micro-grid and different equipment,the equipment optimization scheduling strategy of micro-grid in the optimal operation mode is designed for every ten minutes interval.Furthermore,this paper discusses the influence of carbonemissions on the operation economy and equipment scheduling of micro-grid in different modes.Then,the genetic algorithm is used to simulate the optimal scheduling strategy and the impact of carbon emissions on the MATLAB platform.The example analysis shows that the optimal operation of micro-grid can be realized by optimizing the scheduling of all kinds of equipment,and the security and stability of micro-grid can be ensured,and the operation cost can be saved.At the same time,this paper considers the impact of carbon emissions on operating costs,to minimize the output power of conventional energy generation equipment,thereby saving the cost of carbon emissions generated by the operation of the micro-grid.