| The electricity power company in China which was a integrated vertical management company collecting generation, transmission and distribution in the past, has been decomposed into the independent generation company and grid company which is in charge of the electricity power transmission and distribution. In market environment, The grid companies'main operating purposes are to maximize their own profits and to lower the costs of doing business becomes an important means naturally. The electric power purchase costs are the largest operating cost of grid company, and the largest operating income is income from electricity sales. It is necessary to determine the optimal grid companies'purchase and sale of electricity model by research on operating theory and optimized methods, which is very practical. In addition, the power grid companies shoulder the duty of foundation for national economic development, and provide public goods as products, and the intensive businesses of grid company is benefit to the production and business of other industries. A grid company who really want to reduce the purchase costs and increase the sales revenue should not only optimize the power purchase plan, but also at the same time to fully tap the demand side potentials. Through the joint optimization, the grid company can reduce power purchase costs and realize maximum profits, at the same time, the goals of sustainable development of the whole nation and protection of the ecological environment have achieved.In this paper, the main work and innovations as follows:(1)A comprehensive analysis of the power generation market power of the causes and means of the exercise is presented, and its methods of control are reviewed, the currently important avoiding measures is summed up, and the effect and pricing for costs differented contracts are analyzed from the angle of grid company;(2)The power grid company purchase plan is in the electricity market integrated into a long-term power purchase plan and a short-term power purchase plan. In the long-term power purchase plan, how the power grid company arrange the long-term contract purchase and short-term market purchase considering price risk and market risk factors is analyzed; and in the short term standby purchase optimization, at first the optimal purchase plan of energy and reserve under two price settlement patterns has been analysed thoroughly, and then the schedule model in the national, regional and provincial (municipal) level of the electricity market power purchase plan is constructed as a comprehensive short-term buy electricity market model;(3)Based on the reliability of the basic price ideas, not only the users'reliability requirements are considered, but also consider the user's electricity voltage level, the pricing model for reliability is advanced, which can better reflect the relationship between the cost of electricity and the customers'payment and the equity of price.(4)The TOU tariff classification response idea is promoted, and the sectional classification price response matrixes are constructed. Meanwhile, taking into account the difference between load forecast value and the actual value, the Fuzzy Triangle theory is used to express these uncertainties, based on these theories the optimal TOU price is gotten by solving the two goals of planning.(5)Considering the interruptible load management has brought some uncertainty risk factors to the grid company, a model of interruptible load optimal decision-making model is constructed which combines risk factors and economic factors together and creates a joint optimization model for a more reasonable and practical interruptible electricity prices, in order to encourage the power company's implementation of interruptible load managements.
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