Transmission and distribution coordinated distribution type reactive voltage optimizing method

Abstract

The invention provides a transmission and distribution coordinated distribution type reactive voltage optimizing method, and belongs to the technical field of electrical power system operation and control. The method comprises the following steps: constructing a transmission and distribution combined reactive optimal model formed by a target function and a constraint condition by comprehensively taking the coupling relationship among a transmission network model, a distribution network model and transmission-and-distribution into consideration; then, performing second-order cone relaxation on a non-convex constraint of a distribution network, and converting the non-convex constraint into convex constraint; solving the model by applying an improved generalized Benders decomposition method. The method only needs to interact a small amount of information between the transmission network and the distribution network, has an excellent convergence speed, ensures the scheduling and controlling independence of transmission and distribution, can be used for solving the problems of overvoltage, power dismatching and the like caused by a traditional transmission and distribution independent reactive optimizing method, and can achieve optimal loss of the whole local network.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a distributed reactive voltage optimization method for coordination of transmission and distribution. Background technique [0002] With the large-scale access of distributed renewable energy such as wind power and photovoltaics, the traditional distribution network is developing into an active distribution network. In the active distribution network, distributed renewable energy access is large, and its power generation changes rapidly with time and has strong randomness. In the traditional reactive power and voltage optimization problem, the transmission network and the distribution network are independently optimized. The distribution network is equivalent to a load node in the transmission network, and the transmission network is equivalent to a generator balance node in the distribution network. [0003] However, in the active distribu...

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Problems solved by technology

[0003] However, in the active distribution network, this method has obvious defects, which are mainly reflected in the following three points: 1. A large number of distributed energy sources lead to strong randomness in the distribution network, tight coupling between the distribution network and the transmission network, independent reactive power and voltage The control mode will lead to a large power mismatch at the transmission and distribution boundary; 2. Due to the excessive injection of distributed energy in the distribution network, overvoltage problems are likely to occur at the injection nodes, and the distribution network needs the power of the transmission network. Assist to eliminate overvoltage problems; 3. For the global power grid, independent reactive power regulation lacks coordination between transmission and distribution networks, and cannot guarantee the optimality of the global economic goals

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