| As an important part of smart grid, Microgrid integrates advantages of distributed generations, gives full play to their benefits and value. Economy is an important basis of promotion and development of Microgrid technology, in order to make Microgrid get the maximum benefit or use minimum cost to meet the load demand. Distributed generation units, power electronic control devices, energy storage devices and the other morden instruments in Microgrid change the structure and power flow properties of traditional distributed network, which results that some of the new features of Microgrid must be taken into account while analyzing its economy.Based on the research of the structure of Microgrid and its power supply system, its energy management system, economic operation objective function and the corresponding constraints of Microgrid is formulated according to its cost and benefit. An example model including5micro-sources, cold load, heat load and electrical load is established. The models of power generation and corresponding costs, operation and management costs, the cost of emissions control for each micro-source are formed. According to Microgrid operation mode, energy interaction between Microgrid and power system, type of load, the concept of Microgrid pattern recognition is proposed, objective function and constraints needs to be adjusted according to different patterns.Finnaly, based on differential evolution, with regard to different operation mode and various load demand in Microgrid, power generation distribution scheme of each micro-source is arranged using VC programming language. Based on the typical date load data, economical effeciency of traditional operation mode of Microgrid, such as "wind and solar having priority " and "determine electrical load by heat and cold load", and the impact of "TOU" policy are analyzed in this paper. The efficiency and feasibility of the model and optimization algorithm proposed in this paper is provided. |
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