A method and system for automatic voltage control of power grid based on multi-objective optimization

Abstract

The invention discloses a grid automatic voltage control method and system based on multi-objective optimization. The method comprises a step of discretizing continuous reactive power resource expected values and participating in gird automatic voltage control with discrete reactive power resources, a step of converting a gird automatic voltage optimization control problem into a multi-objective discrete variable optimization problem with boundary conditions and obtaining an optimal solution according to an artificial intelligence algorithm, a step of solidifying each discrete reactive power resource expected value in the optimal solution, at the same time, carrying out secondary voltage control solution for pilot bus voltage in each region in the optimal solution to obtain an expected value of each continuous reactive power resource. According to the method and the system, multiple optimization objectives such as the reduction of the number of times of action of switching devices andthe reduction of network loss are comprehensively considered, the unified and coordinated optimization of discrete and continuous reactive power resources are effectively realized only through one time of global optimization, the optimization efficiency is extremely high, and the method is established based on a traditional AVC system and is easy to implement.

Description

technical field [0001] The present invention relates to the grid automatic voltage control (AVC) technology of the power system, in particular to a grid automatic voltage control method and system based on multi-objective optimization, which is used for coordinating discrete and continuous reactive resources and reducing the number of actions of grid switching equipment , reduce network loss and other optimization control objectives. Background technique [0002] The Automatic Voltage Control (AVC) system is the main system of voltage and reactive power control in modern power grids. Through the automatic regulation of reactive power resources in the power grid, it can improve the voltage quality of the power grid, reduce network losses, and ensure safe, economical and high-quality operation of the power grid. The reactive power and voltage resources of the modern power grid include various grid-connected units on the power supply side, dynamic reactive power compensation eq...

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Problems solved by technology

For example, the Chinese patent document with the application number 201310111454.1 discloses a reactive power and voltage optimization method and device based on AVC system, which uses the primal dual interior point method, branch boundary method and voltage correction control model method to deal with the coordination of discrete and continuous reactive power sources. Optimizing the control problem does not consider the goal of reducing the number of operations of switching equipment; for example, the Chinese patent document with the application number 201410057500.9 discloses an AVC control method for regional power grids, which considers historical experience and future trends, and blocks and adjusts excessive discrete reactive power. Resource control equipment, which limits the number of adjustments to the expected value of a single discrete reactive power resource, does not involve the coordinated control of discrete and continuous reactive power sources, and does not consider multi-objective optimization; for example, a Chinese patent document with application number 201510079849.7 discloses a control method for an AVC system , the continuous reactive resources are discretized and used as discrete reactive resources to participate in optimization control. The optimization goal only considers a single goal, and does not consider multi-objective optimization including reducing the number of actions of switching equipment

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