Ultrahigh-voltage power distribution power-frequency overvoltage suppression method

A technology for power transmission and overvoltage, which is applied to emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problem of power frequency overvoltage, long transmission distance, and transmission capacity of no-load lines. large problems, to achieve the effect of ensuring stability and safety, and smooth current transition

Inactive Publication Date: 2015-06-10
HENAN XINGZHI PATENT SERVICE CO LTD
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  • Abstract
  • Description
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Problems solved by technology

The main characteristics of UHV transmission in my country are large transmission capacity and long transmission distance. The distance between the energy base in the west and the load center in the east is more than 1000km, and the resulting electromagnetic transient and o

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  • Ultrahigh-voltage power distribution power-frequency overvoltage suppression method
  • Ultrahigh-voltage power distribution power-frequency overvoltage suppression method
  • Ultrahigh-voltage power distribution power-frequency overvoltage suppression method

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Embodiment Construction

[0041] Such as figure 1 As shown, it is an UHV power transmission circuit. There is a power frequency overvoltage in power transmission that affects the stability and safety of power transmission. The present invention proposes a controllable shunt reactor model suitable for UHV systems, and makes its structure and principle introduced. Focusing on the analysis of the limitation of controllable reactors on system power frequency overvoltage under different working conditions, it illustrates the effectiveness of controllable shunt reactors in suppressing power frequency overvoltage.

[0042]Power frequency overvoltage will cause changes in system parameters due to circuit breaker operation and various faults (grounding, disconnection, etc.) inside the power grid, causing the oscillation and transmission of electromagnetic energy to cause voltage rise. Its energy comes from the grid itself. And it oscillates on the basis of the power frequency voltage, so its amplitude is roug...

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Abstract

The invention provides an ultrahigh-voltage power distribution power-frequency overvoltage suppression method. For the power-frequency overvoltage generated by a no-load long-line capacitance effect, asymmetric ground faults and three-phase load shedding (or three-phase tripping), a shunt reactor is selected, the upper and lower limits selected for the reactor are calculated, and the power-frequency overvoltage of an ultrahigh-voltage power distribution system is limited by virtue of the transient state adjustment and the series switching of the controllable reactor; as a result, the stability and safety of ultrahigh-voltage power transmission can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of UHV power transmission, in particular to a method for suppressing power frequency overvoltage of UHV power transmission. Background technique [0002] In recent years, with the rapid development of my country's national economy, the demand for electricity is increasing day by day, and even some places have electricity shortages during the peak period of electricity consumption, so the establishment of UHV power transmission system will help solve this situation and make resources More optimization, improve energy utilization. The main characteristics of UHV transmission in my country are large transmission capacity and long transmission distance. The distance between the energy base in the west and the load center in the east is more than 1000km, and the resulting electromagnetic transient and overvoltage problems are more prominent, mainly manifested in its capacitance. The effect is abnormally significan...

Claims

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Application Information

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IPC IPC(8): H02H9/04
Inventor 马新攀
Owner HENAN XINGZHI PATENT SERVICE CO LTD
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