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Electric power is an important energy with the electric energy as the power, which is the basis for the operation of the national economy. Electric grid is a carrier of electric energy transmission, which is comprised by the transmission equipment, substation equipment, power distribution equipment and corresponding auxiliary system. The safe and stable operation of the electric grid is related to people's life, economic development and national security and social stability. In recent years, the speed of electric grid construction and development is very rapid. On the one hand, the scale of electric grid is bigger and bigger, the grid structure is more and more complicated, and the objective physical environment of the safe and stable operation of electric grid is changing greatly; on the other hand, the operation system of electric power system is undergoing profound changes, and the impact of separation of plant and network, energy saving and emission reduction and energy saving power generation dispatching, the formation of diversified investment environment on the electricity market and continuous advancement of the regional market on the safe, stable and economic dispatch operation of the electric grid is also increasingly emerging. Nowadays, the electric grid has become an interconnection whole. Interdependence between the subnets in the interconnected electric grid is increasingly serious, and the management is more complex, but the matching dispatch decision support system is lack of a unified technical support system. The current information system plays an important role in the dispatching production, but fails to meet the needs of security and stability control of the interconnected electric grid, quality economic operation and optimal allocation of resources [1] . Therefore, under a new dispatching environment, it is very difficult to accurately complete the modern electric grid security economic dispatch tasks only by relying on the improvement of the quality of dispatch decision teams and on the previous dispatch model. However Fengyu Qi School of Electrical and Information Engineering, Tianjing University, Tianjin, ChinaABSTRACT: At present, the electric grid economic dispatch problems present a trend of non-linearity, high dimensionality, discretization and multi-objective. The principle and objective of electric grid dispatch operation are facing new challenges. This paper establishes a distributed electric grid economic dispatch mathematical model based on multi-objective optimization, considers three objective functions, such as maximization of economic benefit, minimization of unit operating energy consumption and minimization of polluting gas emissions from the perspective of electric grid partitioning and coordination calculation, and elaborates the solving process of the model. The results of calculation cases show that this method can achieve a good result in the optimization process of distributed electric grid economic dispatch.

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The electricity market is a complex nonlinear system, which not only follows the basic rules of market economy, but also is affected by the power system. This paper considers the non-stationarity of electricity futures and spot electricity price, and puts forward a forecasting model of futures electricity price by means of a cointegration theory to carry out an empirical research on the dynamic relationship between the electric spot markets and future markets. The research results show that there is a long-term equilibrium cointegration relationship between the spot electricity price and futures electricity price, and the combination of long-term relationship and short-term dynamic in time series of electricity price is realized, and a higher forecasting accuracy is obtained.