Global reactive voltage optimization method for power transmission and distribution network

Abstract

The invention relates to a global reactive voltage optimization method for a power transmission and distribution network. The method includes the steps that coordinate boundary points of a power transmission network and an active power distribution network are selected; a power transmission network reactive voltage optimization model including complementary constraints is established, and an interior point method is used for solving; the optimization voltage of the power transmission network is converted into a three-phase voltage which is used as the three-phase voltage of an active power distribution network root node; a three-phase reactive voltage optimization model including complementary constraints of the active power distribution network is established, and the interior point method is used for solving; the three-phase optimization power of the active power distribution network is summated and then is used as the corresponding load power of the power transmission network; reactive voltage optimization of the power transmission network and reactive voltage optimization of the active power distribution network are in alternate iteration, when every two adjacent iteration changes of the boundary point power of the power transmission and distribution network meet convergence precision, the global reactive voltage of the power transmission and distribution network is subjected to optimizing convergence, and accordingly a global reactive voltage optimizing strategy is obtained. The problem that the reactive voltage optimization results of the power transmission and distribution network are inconsistent at the boundary points of the power transmission and distribution network can be solved, voltage and power mismatching at the boundary points is eliminated, and reactive resources of the two stages of networks are optimized.

Description

technical field [0001] The invention relates to a reactive power voltage optimization method of a power system, in particular to a global reactive voltage optimization method of a transmission and distribution network. Background technique [0002] The reactive power optimization of the power system is to realize the reactive power distribution under the premise of ensuring the safe and stable operation of the power grid, using the reactive power of the generator, the on-load tap changer tap (OLTC), and the output of the reactive power compensation device that can be switched. Layer partition balance, an optimization method to improve the voltage quality of the power grid and reduce network loss. [0003] The reactive power and voltage optimization of the transmission network and the active distribution network are mostly carried out independently at present, and the equivalent processing at the boundary nodes will cause the power and voltage mismatch at the boundary nodes. ...

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Problems solved by technology

"A Distributed Reactive Power Optimization Method for Regional Power Grids" (Li Zhongxu, Liu Yutian, "Journal of Electric Power System and Automation", 2005, 17(2): 80-83) summarizes the reactive power optimization of transmission and distribution networks Due to the differences in the network structure and reactive power optimization characteristics of the transmission and distribution network, it is not appropriate to use a unified method to build a global reactive power and voltage optimization model. into the situation

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