| With the global energy crisis and environment problem becoming more and more serious, the distributed power generation technology widely used clean renewable energy has been rapid development, and the distributed power load, energy storage unit is in an integrated form of micro-grid technology has become a research hotspot. In China, according to the regional characteristics of micro grid can be divided into the city area microgrid and rural microgrid, in which topic micro source are micro gas turbine and small hydropower. According to the micro grid containing small hydropower, how to make the minimum exchange cost between the microgrid and the main power grid and the maximum power generation of the small hydro in the cycle; according to the CCHP micro grid containing micro gas turbine, in the grid-connected/islanded microgrid is how to make the minimum cost of power generation, the highest environmental benefit, In the isolated microgrid how to solve the problem of load shedding; simultaneously for the two kinds of energy storage device of the micro grid, how to overcome the intermittency of the renewable energy, to reach the effect of peak load shifting. All the above problems has important theoretical research significance and practical application value.Aiming at these problems, this paper has done the following work. Firstly, simplification is based on the typical micro grid structure, and the micro grid structure with typical micro source has gotten. According to micro grid containing small hydropower, the period of minimum cost of power generation and maximum amount of hydropower generation is used as the objective function to establish the mathematical optimization model, the Particle swarm optimization algorithm based on parametric equation method to handle equality constraints applied to analyze specifically on the model of the dry season, and the common particle swarm optimization algorithm to do a comparative analysis, the moment hydropower output power, battery charge and discharge power and the exchange power value between the microgrid and the main power grid gotten. According to the CCHP micro grid containing micro gas turbine, the period of minimum cost of power generation and the highest environmental benefits in microgrid is used as the objective function to establish the mathematical optimization model, combining with two kinds of improved particle swarm algorithm, the summer typical daily grid-connected mode and the winter typical daily islanded mode considering time price are also selected to study respectively, both modes doing analysis of cost component. According to the intermittency of the renewable energy, this paper explores a charge and discharge control strategy of battery by active set algorithm.The simulation results of microgrid containing small hydropower show that:quick adjusting output power of the hydropower station compensate the fluctuation of wind turbine and photovoltaic, to overcome the shortcomings of the scenery the fluctuation and intermittence, give full play to complementary advantages of energy, improved particle swarm optimization algorithm compared with particle swarm algorithm making the power cost less, the amount of hydropower more. The simulation results of the CCHP microgrid containing micro gas turbine show that:to purchase power form the main power grid when the output power cost of the micro grid is higher than electric power price in the valley and ordinary time, ensuring safety and stability for the systems to sale power form the main power grid in the peak time, can produce good environmental economic benefits, study the load shedding in isolated mode, through the coordination of the efforts of the various micro source can also achieved good economic benefits. Simultaneously, two kinds of simulation analysis results show that the explored control strategy of the battery can enhance schedulability of wind power, photovoltaic, reach the effect of peak load shifting. |
