A distributed transmission and distribution cooperative unit combination method based on DC power flow equivalence

Abstract

The invention provides a distributed transmission and distribution cooperative unit combination method based on DC power flow equivalence, which comprises the following steps: a transmission and distribution joint system is decomposed into a transmission system, a boundary system and a distribution system, and based on a DC power flow equivalence algorithm, a transmission system sub-optimization model and a distribution system sub-optimization model are established; optimizing the transmission system sub-optimization model and the distribution system sub-optimization model; The constraint conditions of transmission system and distribution system are established, and the D-TDCUC model; An alternating direction multiplier method is used to calculate the D. The TDCUC model is solved to obtainthe results of the distributed transmission and distribution cooperative unit commitment. The invention combines the ADMM algorithm with the DC power flow equivalent method, eliminates the node voltage phase angle variable in the transmission system and each distribution system model, reduces the equation quantity and the variable number of the transmission system and the distribution system model, improves the calculation speed of each iteration of the distributed algorithm, and is convenient for practical engineering application.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for combining distributed transmission and distribution cooperative units based on DC power flow equivalence. Background technique [0002] With the widespread access to renewable energy, the physical characteristics of the power distribution system change from purely passive to active. A large amount of renewable energy is connected to the power distribution system to enrich the means of adjusting active and reactive power, and the power distribution system will also have a stronger ability to support the operation of the power transmission system. At the same time, the output of renewable energy has random characteristics, and power distribution The system needs the strong support of the transmission system. If the penetration rate of renewable energy is further increased, there will be two-way power exchange between the transmission system and part of the dis...

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Problems solved by technology

[0007] The purpose of the present invention is to propose a distributed transmission and distribution cooperative unit combination method based on DC power flow equivalence, to overcome the long calculation time of the existing distributed solution for a single iteration, which obviously reduces the calculation speed of the distributed algorithm, Technical defects that are not conducive to the practical application of engineering

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