A method of voltage sag state estimation based on fixed point iteration

A technology of voltage sag and state estimation, applied in AC network voltage adjustment, electrical components, complex mathematical operations, etc., can solve problems such as difficult optimization, complex mathematical models, and high dimensionality of underdetermined equations, achieving low monitoring costs, The effect of good convergence and fast convergence speed

Active Publication Date: 2022-04-01
ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY +2
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Problems solved by technology

[0012] In view of the above problems, the object of the present invention is to provide a voltage sag state estimation method based on fixed point iteration, so as to realize the estimation of the voltage sag frequency of unmonitored nodes through the data monitored by limited monitoring nodes, and solve the problem of Existing numerical solution method The mathematical model of the existing sag state estimation method is complex, the dimension of the underdetermined equation is high, and the problem of optimization is difficult

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  • A method of voltage sag state estimation based on fixed point iteration
  • A method of voltage sag state estimation based on fixed point iteration
  • A method of voltage sag state estimation based on fixed point iteration

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[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] On the basis of the general voltage sag state estimation model, the present invention firstly establishes a convex objective function to represent it, and then solves the optimal solution of the convex objective function through fixed point iteration, so as to realize the monitoring data of limited monitoring points for future monitoring. The voltage sag frequency of the monitoring bus is estimated. It solves the problems of complex mathematical model, high dimension of underdetermined equations and difficult optimization in existing numerical solution method and existing sag state estimation method. The flow chart of the steps is as follows figure 1 As shown, the specific steps are as follows:

[0037] Step 1: Establish a voltage sag state estimation model for a single event.

[0038] The general formula for voltage sag sta...

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Abstract

The invention discloses a voltage sag state estimation method based on fixed point iteration. Firstly, a convex objective function is established to represent it, and then the optimal solution of the convex objective function is solved through fixed point iteration, so as to realize the method through limited monitoring points. The monitoring data estimates the frequency of voltage sags on unmonitored buses. The invention realizes the estimation of the voltage sag frequency of the unmonitored nodes through the data monitored by the limited monitoring nodes; solves the problem of complex mathematical model and underdetermined equation dimension of the existing sag state estimation method in the existing numerical solution method High, difficult problem of optimization.

Description

technical field [0001] The invention relates to the technical field of voltage sag state estimation, in particular to a voltage sag state estimation method based on fixed point iteration. Background technique [0002] Voltage sag is one of the most important power quality disturbances because it can have a serious impact on the operation of power electronic equipment. In the 1990s, the severity of voltage sags was measured by two parameters, residual voltage and amplitude. This evaluation method based on the parameters of a single event itself proved to be insufficient in the late 90's due to the increasing need to quantify the power quality characteristics of specific user sites. Therefore, a new index—frequency of occurrence of voltage sags is introduced, which has been widely accepted by the industry. [0003] In order to measure the frequency of voltage sags, it is necessary to install power quality monitoring devices in the power system. However, due to the high cost...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12G06F17/15G06F17/16
CPCH02J3/12G06F17/15G06F17/16H02J2203/10
Inventor 袁文迁张超武宇平马鑫晟刘慧林蔡维张晓华庞博张建袁翔卢毅宋鹏刘亮雷雨马尚黄小龙谢丽芳
Owner ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY
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