Space-time power balancing method and system of power grid

Abstract

The invention provides a space-time power balancing method and system for a power grid, and the method comprises the steps: considering the uncertainty of wind power output in a day-ahead stage, generating a large number of random scenes, carrying out the equivalent building of an inter-network space power balancing model for each network, and employing the sensitivity of node voltage and branch current to node power to prevent the node voltage and branch current from exceeding the limit, obtaining an operation domain of the flexible multi-state switch; establishing a model in each day-ahead network by taking an optimization result of a space power balance flexible multi-state switch between the day-ahead networks as a basis and taking time power balance in each network as a target, and obtaining an operation domain of the energy storage device according to a large number of random scene optimization results; and in the intra-day stage, based on the operation domains of the flexible multi-state switch and the energy storage device, the final power of each regulation and control means in each time period is obtained by taking the weighted sum of the intra-day electricity purchase cost from the superior power grid and the voltage deviation as the target. Compared with a traditional regulation and control mode, the method has the advantages that the operation cost can be reduced, and the flexibility of intraday regulation and control is improved.

Description

technical field [0001] The invention belongs to the field of distribution network operation optimization, and more specifically relates to a time-space power balance method and system of a power grid. Background technique [0002] With the continuous application of renewable energy power generation, the penetration rate of renewable energy power generation in the distribution network continues to increase, while the common wind power generation is greatly affected by the weather, and its output presents uncertainty and volatility. It is difficult for the traditional distribution network to effectively deal with the uncertainty of wind power output. Therefore, various active control equipment, such as flexible multi-state switches, energy storage devices, reactive capacitor banks and reactive power compensators, have been connected to the grid to form an active distribution network. power grid. The uncertainty of wind power output exacerbates the spatial power imbalance betw...

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Problems solved by technology

[0007] In view of the defects of the prior art, the purpose of the present invention is to provide a space-time power balance method and system of the power grid, aiming at solving the problems of unbalanced power between distribution networks and within it and insufficient flexibility of intraday regulation

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