Incremental power distribution network transfer capacity optimization method based on extended Kalman filtering

Abstract

The invention relates to an incremental power distribution network transfer capacity optimization method based on extended Kalman filtering, and the method comprises the steps: S1, building a model ofa local main transformer and a feeder line, and carrying out the linearization of a state equation and an observation equation; S2, carrying out time updating, and predicting a power posteriori estimated value and a power error at the current k moment; S3, performing observation updating, and obtaining an optimal power estimation value and a system prediction power error at the current k moment according to the power posteriori estimated value and the power error at the current k moment; and S4, carrying out k (n-1 + 1) principle inspection, if the k (n-1 + 1) principle inspection meets the requirements, outputting the current state, otherwise, changing the states of a section switch and an interconnection switch to carry out network reconstruction, re-planning a transfer path, and carrying out state output after ensuring that the transfer capability requirements are met. Compared with the prior art, the method has the advantages of being economical and reliable, improving the transfer capacity and the like.

Description

technical field [0001] The invention relates to the technical field of power transfer of incremental distribution networks, in particular to a method for optimizing power transfer capacity of incremental distribution networks based on extended Kalman filtering. Background technique [0002] With the operation of the new round of power system reform, the incremental distribution network came into being. In principle, it refers to the power grid with a voltage level of 110kV and below and the industrial park (economic development zone) with a voltage level of 220 (330) kV and below. The power grid is not under the jurisdiction of the State Grid. Although it is not a new technology, it is just a statement to cooperate with the new power reform, but the accompanying problems cannot be ignored, including: scope boundary division, external power grid dispatching, load growth forecast deviation, transfer capacity research, investment economics etc., will have a certain impact on t...

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Problems solved by technology

[0003] As the operating boundary of the smart distribution network, the transfer capacity plays an important role in improving the overall power supply capacity of the network and realizing the flexible and controllable power grid. Generally, it needs to be completed by evaluating the capacity of the transformer, calculating the power supply capacity of the network, and verifying the safety criteria. The methods for obtaining supply capacity include the capacity-load ratio method, the maximum load multiple method, and the network maximum flow method. Optimal state estimation, whether there is a path that can be transferred, which one to choose is the most economical and reliable, whether a certain state in the process will affect the selection of the next transfer path, and how to accurately predict each state in the transfer process issues need further study

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