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Method for discriminating requirements of ultra-high voltage (UHV) line steady-state overvoltage device

A discrimination method, ultra-high voltage technology, applied in the direction of circuit devices, electrical components, instruments, etc., can solve problems such as heavy workload, missed judgment, misjudgment, and tediousness, and achieve simple use, small amount of calculation, and strong adaptability Effect

Active Publication Date: 2010-06-02
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0003] At present, the UHV power grid is still in the early stage of development. Whether UHV lines need to be equipped with steady-state overvoltage devices depends entirely on the use of power system simulation software to simulate the voltage distribution along UHV air-charging lines under a large number of different working conditions. To judge whether there is a steady-state overvoltage problem, the workload is huge and very cumbersome; at the same time, using the enumeration method for the research conditions will inevitably lead to missed judgments and misjudgments

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  • Method for discriminating requirements of ultra-high voltage (UHV) line steady-state overvoltage device
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  • Method for discriminating requirements of ultra-high voltage (UHV) line steady-state overvoltage device

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Embodiment Construction

[0021] Such as Figure 5 As shown, the steps of the UHV line steady-state overvoltage device demand discrimination method of the present invention are as follows:

[0022] Step A: Establish a power grid data model including the UHV line to be requested. The power grid data model includes the grid structure, models and parameters of lines, transformers, generators, loads and other related components. By using the Newton-Raphson method to calculate the initial operating conditions of the power grid, the basic conditions such as bus voltage, power angle and line power are obtained; When the high-voltage equipment switch three-phase trips, the steady-state voltage recovery value U of the 1000kV bus on the air side of the UHV line;

[0023] Step B: Assume that the UHV bus voltage on the combined air side is the bus steady-state voltage recovery value U obtained in the above steps, and use the line inductance L per unit length of the UHV conductor 0 and charging capacitor C 0 Cal...

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Abstract

The invention relates to a method for discriminating requirements of an ultra-high voltage (UHV) line steady-state overvoltage device, which is based on the lossless transmission line theory. According to the lossless transmission line theory, the voltage relationship and the current relationship between any two points on a line can be analyzed as long as distribution parameters of wires are known. By using the characteristic, the method analyzes the voltage distribution situations when a power system with a UHV idle line operates, comprehensively considers the parameters, the lengths and the high-resistance configurations of UHV wires, and judges whether steady-state overvoltage problems occur in the UHV line and whether a steady-state overvoltage device needs to be configured. Traditional discriminating methods completely use power system simulation software to conduct large amounts of verbose simulations, however, the discriminating method of the invention overcomes the problems, has the characteristics of good adaptability, simple operation and less calculation amounts, and can be used for the quick discrimination of the requirements of a UHV steady-state overvoltage device.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method for judging the demand of steady-state overvoltage devices of UHV lines based on the theory of lossless transmission lines. Background technique [0002] UHV AC lines have the characteristics of long power transmission distance and high charging power. When the three-phase trip of any UHV equipment switch is caused by the switch sneak trip or the action of the UHV de-loading device, the system will run with UHV empty line, and the voltage along the UHV line will increase significantly. Considering the line charging capacitance and high voltage Anti-resistance configuration, the highest point of the line voltage is not at the end of the line, but at a certain point at a certain distance from the end. At this point, the UHV charging power and the capacitive reactive power of the third winding of the UHV transformer rush to the 500kV system on both sides. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J13/00G06Q50/00G06Q50/06
Inventor 唐晓骏孟远景张文朝付红军马世英孙素琴刘东冉孙建华秦晓辉胡扬宇刘楠孙冉熊浩清
Owner CHINA ELECTRIC POWER RES INST
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