Decomposition coordination optimal power flow control method for transmission network and distribution network in power system

Abstract

The invention relates to a decomposition coordination optimal power flow control method for a power transmission network and a power distribution network in a power system and belongs to the technicalfield of power system operation control. A polar coordinate optimal power flow control model of a power transmission network and a branch optimal power flow control model of a power distribution network are comprehensively considered, and a boundary coupling relationship between the power transmission network and the power distribution network is combined to establish an optimal power flow control model of power transmission and distribution coordination. The invention provides an iterative solution algorithm between a power transmission network and a power distribution network in a power system for a proposed optimal power flow control model adopting convex relaxation technology to realize decomposition coordination calculation of the optimal power flow control model of power transmission and distribution coordination. The algorithm involved in the method has a good convergence rate, the global total power generation cost of the power transmission network and the power distributionnetwork can be reduced, and the safety problems of mismatching of transmission and distribution boundary power, voltage out-of-limit and the like are eliminated.

Description

technical field [0001] The invention relates to a decomposition and coordination optimal power flow control method of a transmission network and a distribution network in a power system, belonging to the technical field of power system operation control. Background technique [0002] With a large amount of renewable energy connected to the power grid, the development trend of the power system is that the transmission network and the distribution network are closely coupled. The traditional optimal power flow control of the transmission network and distribution network is carried out independently, and its disadvantages are that unnecessary power generation cost losses may occur, and at the same time, it may lead to safety problems such as power mismatch at the transmission and distribution boundary and voltage overshoot. Therefore, it is necessary to coordinate the transmission network and distribution network for joint optimal power flow control. [0003] However, since th...

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Problems solved by technology

[0003] However, since the transmission network and the distribution network are independently operated and controlled by different control centers, there is a problem of information privacy between different control centers, which makes it difficult to optimize the control in a centralized manner.

Therefore, it is necessary for the transmission network and the distribution network to decompose the optimal power flow control and coordinate boundary information. At present, there is still a lack of technology that can coordinate efficiently according to this mode

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