Distributed optimization method for coordination problem of power transmission network planning and power distribution network operation

Abstract

The invention discloses a distributed optimization method for a coordination problem of power transmission network planning and power distribution network operation. A power transmission network planning sub-model and a power distribution network operation optimization sub-model are respectively constructed according to the differences of the power transmission network and the power distribution network in the aspects of operation modes, network parameter characteristics, source load distribution characteristics and the like. Based on the strong dual condition, the two optimization sub-problems are converted into a single-layer equivalent model, and the model is solved through commercial solution software. Compared with the prior art, the active support effect of power distribution network operation optimization on the power transmission network planning is considered, the investment of the power transmission network is reduced, and the planning economy is improved. And for a power transmission network scene with high-proportion renewable energy access, the method has better adaptability.

Description

technical field [0001] The invention relates to a method for solving a power grid planning problem, in particular to a distributed optimization method for the coordination problem of transmission network planning and distribution network operation. Background technique [0002] First of all, a large number of distributed renewable energy sources are connected to the distribution network level. Due to the limitation of resource endowment, the output of these distributed energy sources presents random, fluctuating, and intermittent characteristics, which brings challenges to the economical, safe, and flexible operation of the distribution network. In order to effectively suppress system operation risks and give full play to the substitution effect of renewable energy, distribution network operators can adjust the system status from the source, network, load and storage side, that is, take some active management measures. Specifically, the source side can control the distributed...

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Problems solved by technology

[0006] 1) For the optimal operation of the distribution network, the interconnection and mutual complementarity with the transmission network are not considered, and the dispatching scheme obtained is poor in economy, adaptability and flexibility

[0007] 2) For the transmission network planning problem, the flexible adjustment resources and capabilities of the lower-level distribution network are ignored, and the deviation estimates the line congestion level, which may cause overload or over-investment scenarios in the future operation of the planned grid

[0008] 3) For the solution method of the collaborative optimization problem, the existing methods are either low in efficiency and poor in accuracy or difficult to reveal the physical meaning of dynamic boundary interaction information, and cannot provide production practice guidance for planning and operation personnel

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