220kV power grid structure planning method considering differentiation scenes

Abstract

The invention provides a 220kV power grid structure planning method considering differentiation scenes, and relates to a grid planning method. The method comprises the steps that 1) a number of planning scenes are generated according to the reliability level difference of a power grid and the new energy access proportion difference; 2) the minimum integrated investment is used as a planned objective function, and mathematical modeling is carried out on the planned objective function; 3) different admittance matrices are generated for different planning schemes; and 4) the optimal grid sequence in the 220kV power grid planning method is acquired, and multiple planning scenes are generated according to the reliability level difference of the power grid and the new energy access proportion difference. According to the technical scheme, the minimum integrated investment is used as the objective function to carry out mathematical modeling; different admittance matrices are generated for different planning schemes; a genetic algorithm is used for solving; and compared with the prior art, the method provided by the invention comprehensively considers constraint differences in the power system planning, and has better adaptability when the fluctuation range of each constraint index in different scenes is larger.

Description

technical field [0001] The invention relates to a grid planning method, in particular to a 220kV grid planning method considering differentiated scenarios. Background technique [0002] First of all, the 220kV power grid in most areas of my country is in the middle of the voltage level sequence, between the transmission and distribution functions, and plays an important role in connecting the transmission and distribution networks. At present, in large cities with high load density in my country, the function of the 220kV power grid has changed from a traditional transmission network for electric energy transmission to a high-voltage distribution network whose main function is to distribute electric energy; but in towns and vast rural areas where the load density is not high, The 220kV grid is still the backbone transmission grid. It is because of the connecting role of the 220kV power grid that its structure research is particularly important. On the one hand, in areas wit...

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Problems solved by technology

[0006] 1) For the 220kV power grid planning parameter values ​​fluctuate greatly, and the difference between the sending and receiving ends is obvious, there is a lack of differentiated grid generation methods

[0007] 2) Regarding the limitation of the short-circuit current level of the 220kV power grid, there is a lack of a planning method for verification first, and the accuracy of the solution and the accuracy of the optimization direction are poor

[0008] 3) For the N-1 principle verification of the 220kV power grid, there is a lack of risk verification of blackout accidents with LOLP as the index and chance constraints by first verification

The flexibility of grid generation in large-scale wind power grid-connected planning cannot be guaranteed

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