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Reactive power optimization method for AC/DC system based on two-layer planning and considering voltage stability

A technology for AC and DC systems and voltage stability, applied in the directions of reactive power compensation, AC network voltage adjustment, reactive power adjustment/elimination/compensation, etc. Improved voltage distribution and guaranteed convergence

Inactive Publication Date: 2017-06-20
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

In addition, due to the large amount of electric energy input by DC transmission, which replaces a large number of local thermal power units, the voltage support capacity of the grid is reduced, and the voltage stability is increasingly prominent.

Method used

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  • Reactive power optimization method for AC/DC system based on two-layer planning and considering voltage stability
  • Reactive power optimization method for AC/DC system based on two-layer planning and considering voltage stability
  • Reactive power optimization method for AC/DC system based on two-layer planning and considering voltage stability

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] According to the two-level programming theory, a reactive power optimization mathematical model of AC and DC systems is established considering the voltage stability margin; the upper model takes the minimum active network loss of the system as the objective function, and is constrained by the power flow equation under normal operating conditions and a series of inequalities Constraint conditions are formed. According to the characteristics of the model, the upper layer adopts a hybrid optimization algorithm combining genetic algorithm and primitive-dual interior point method; the lower layer model takes the maximum voltage stability margin of the system as the objective function, and uses power flow equality constraints and inequality constraints as constraints Composition, using a hybrid algorithm combining genetic algorithm and conti...

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Abstract

The present invention relates to a reactive power optimization method for an AC / DC system based on two-layer planning and considering voltage stability, so as to find a reactive power optimization scheme which satisfies economy and reliability. The reactive power optimization method for an AC / DC system comprises the following steps of: 1) establishing a reactive power optimization two-layer model of an AC / DC system by using a two-layer planning method, wherein the reactive power optimization two-layer model comprises an upper model and a lower model, and determining objective functions and constraint conditions of the upper and lower models; 2) adopting a hybrid algorithm of a genetic algorithm and a primal-dual interior point method to solve the upper mathematical model to get the optimal reactive power optimization scheme; 3) using a hybrid optimization algorithm of a continuous power flow algorithm and a genetic algorithm to solve the lower mathematical model to solve the maximum voltage stability margin of the AC / DC system. Compared with the prior art, the reactive power optimization method of the system has the advantages of comprehensive consideration, high reliability, clear logical structure, practical reason, etc.

Description

technical field [0001] The invention relates to the field of reactive power optimization of power systems, in particular to a reactive power optimization method for an AC / DC system that considers voltage stability comprehensively, has high reliability, clear logical structure, and is practical and reasonable. Background technique [0002] In recent years, my country has vigorously promoted the development of UHV AC and DC systems. As of the end of 2016, my country has the only power grid in the world that operates UHV AC and DC simultaneously. Compared with the traditional power transmission system, UHV DC transmission has three advantages: large-capacity and long-distance transmission of electric energy; rapid adjustment of DC line power to improve the stability of system operation; and connection of two power grids that are not synchronized or have different frequencies. These advantages make DC transmission more and more attention, the proportion of power grid is increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/16
CPCH02J3/16H02J3/18H02J2203/20Y02E40/30
Inventor 崔勇冯煜尧郭强张开宇冯楠
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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