Optimal Operation Strategy Of Microgrid Based On Multi Economic Entitis

Microgrid is an important form to absorb distributed clean energy.However,different new energy power stations in the microgrid are built by different developers.Their investment and power generation costs are different.Under the unified power sales price,how to reasonably distribute the power sales revenue of various economic entities in the microgrid is an urgent problem to be solved.In addition,how to adjust the distributed power output in the isolated island microgrid,so as to ensure the stability of frequency and voltage and ensure the benefits of all economic subjects,is the basis for the safe and stable operation of microgrid.This paper studies the safe operation of microgrid with multi economic agents in the state of grid connection and island,and puts forward the economic operation optimization model and solution algorithm,which is of great significance to further promote the healthy and orderly development of microgrid with multi economic agents.This paper analyzes the impact of the operation control mode of microgrid and the operation control mode of distributed generation on the economic operation of microgrid,and summarizes some economic problems caused by improper operation mode and control mode of microgrid in island mode.The power output models of photovoltaic,wind power,micro gas turbine and energy storage system are used to calculate the maximum power that can be output by each distributed power generation and energy storage system.Based on the income requirements of various economic entities,the economic models of different power generation entities in microgrid considering fixed input and active power loss are obtained.Based on the different states of grid connected operation or island operation of microgrid,a system optimization economic operation model is established to minimize the power consumption cost of microgrid and meet the income requirements of various economic entities and the constraints of safe and stable operation of microgrid.Moreover,a pseudo mirror dynamic space particle swarm optimization algorithm improved genetic algorithm is proposed to solve the model.The active power variation range of energy units such as distributed generation and load constitutes each dimension of real space,and the reactive power variation range of energy units constitutes each dimension of virtual space.The concept of pseudo image factor is proposed to improve the optimization efficiency of virtual particles corresponding to each real particle.By adjusting the dynamic parameters in the iterative process such as the weight coefficient and acceleration factor of the improved particle swarm optimization algorithm,the pseudo mirror dynamic space particle swarm optimization algorithm is nested in the iterative cycle of genetic algorithm,so that it can solve the optimal economic operation problem under different microgrid operation modes and distributed power generation control methods.Finally,a multi-economic microgrid with wind power,photovoltaic,micro gas turbine and energy storage system is taken as an example to carry out verification research.The results show that the operation strategy proposed in this paper can achieve optimal economic operation on the premise of meeting the frequency stability and voltage stability of microgrid,and can provide a useful reference for the optimal dispatching control of microgrid.