A power grid structure optimization method for reducing network loss and alleviating voltage sag

Abstract

The invention discloses a power grid structure optimization method capable of reducing transmission loss and relieving voltage sag, comprising the following steps: first, acquisition of optional operation schemes of a power grid: acquiring all optional operation schemes according to the condition whether parallel capacitors are installed on respective buses in a to-be-optimized power grid, capacity of the installed parallel capacitors, the condition whether switches are installed on respective branches, and states of the installed switches; second, feasibility determination; third, determination of transmission loss of the power grid: screening operation schemes with low transmission loss; fourth, determination on influence of voltage sag: 401, calculating voltage sag evaluation indexes of the power grid, 402, determining a configuration scheme with low voltage sag influence; and fifth, investment cost determination: 501, calculating investment cost, 502, determining an optimized operation scheme. The power grid structure optimization method disclosed by the invention has the advantages of simple method steps, reasonable design, convenience for implementation, good using effect, reduced transmission loss, relieved voltage sag, economical configuration of the parallel capacitors and capability of realizing safety operation and economical operation of the power grid.

Description

Technical field [0001] The invention belongs to the technical field of grid optimization operation, and particularly relates to a grid structure optimization method for reducing grid loss and alleviating voltage sag. Background technique [0002] Currently. With the development of modern industry, the available resources are constantly decreasing, and energy conservation has gradually been recognized and valued by people. The power system uses various methods to reduce network losses. The line loss rate of major western industrial countries is roughly 5% to 8%, while that of my country is about 9%, which is still far behind that of developed countries. Continuously reducing the network loss of the power system and improving the economic benefits of the power system operation is a long-term issue facing the power system. [0003] With the increasing proportion of sensitive loads in industrial loads, the problem of voltage sags has become more and more serious. Voltage sags have b...

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Problems solved by technology

In terms of voltage sag control, the power supply side can alleviate the voltage sag from the perspective of optimizing the grid structure. The grid structure affects the static security and stability of the system and also affects the transient security and stability. Research on the Effects of Changes on the Transient Stability of Power Systems" studies this problem. In order to solve the above problems, there are also many research results. For example, Tao Shun, Xiao Xiangning, etc. published in "China The article "Random Prediction and Mitigation Measures for Voltage Sag in Multi-structure and Multi-Network Structure System" on pages 30-34 of "Electric Power" proposes that an effective measure to alleviate voltage sag is the implementation of multi-slice and multi-power sources in the distribution network The closed-loop design of open-loop power supply; Chen Wei, Zhao Jinping published the article "Simulation Analysis of Voltage Drop Sag Domain in Complex Power Grid" on pages 1322-1327 of "Power Grid Technology" in Volume 4 of Issue 41 in 2014. Different structures of transformer neutral points in the system and the impact of unit start-up and stop on the voltage sag depression domain; Chen Wei, Zhao Jinping published an article on pages 1322-1327 of "Power Grid Technology" in Volume 4 of Issue 41 in 2014. Simulation analysis of voltage sag sag domain in complex power grid", Ma Li, Liu Jian, etc. published the article "Grid for voltage sag" on pages 21-25 of "Grid and Clean Energy" in Volume 8 of Issue 31 in 2015 Structural Evaluation", put forward the grid structure evaluation index oriented to voltage sag, but only considered the case of the bus fault, but did not consider the fault on the branch

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