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Device for suppressing active overvoltage, composite bypass switch, and control method and system

A technology of bypass switch and control method, which is applied in the direction of emergency protection circuit device, circuit device, emergency protection circuit device for limiting overcurrent/overvoltage, etc., can solve the limitation, poor suppression effect, slow response speed, etc. problems, to achieve the effect of small operating loss, improved response speed, and reduced recovery voltage

Pending Publication Date: 2017-11-21
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +3
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AI Technical Summary

Problems solved by technology

The controllable equipment such as the magnetic control overvoltage suppression device can solve the steady-state voltage problem of too high voltage in the light load mode and too low voltage in the heavy load mode, but limited by its working mechanism and control mode, the operation overvoltage The response speed of fast transient overvoltage such as power frequency overvoltage is slow, and the suppression effect is poor

Method used

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  • Device for suppressing active overvoltage, composite bypass switch, and control method and system
  • Device for suppressing active overvoltage, composite bypass switch, and control method and system
  • Device for suppressing active overvoltage, composite bypass switch, and control method and system

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Embodiment Construction

[0033] Embodiments of the present invention will be further described from the following aspects in conjunction with the accompanying drawings:

[0034] 1. System composition of fast active overvoltage suppression device

[0035] Such as figure 1 The connection relationship of the active overvoltage suppression device is shown. For the active overvoltage suppression device for EHV / UHV applications, due to its large body capacity, it usually adopts a single-phase structure.

[0036] Such as figure 2 As shown, each phase body of the EHV / UHV active overvoltage suppression device consists of an iron core and a winding. The iron core is split into four core columns, and the primary winding (that is, the grid side winding, also called the working winding) is wound around the middle two core columns. Above, a secondary winding (namely the excitation winding, also known as the control winding) is wound on each core.

[0037] Among them, L A , L B , L C are the grid-side winding...

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Abstract

The invention provides a device for suppressing active overvoltage, a composite bypass switch, and a control method and system. The device for suppressing active overvoltage includes three single-phase bodies connected in parallel, each body includes an iron core formed by four iron core columns, two exciting windings reversely wound on the two middle iron core columns, and line side windings wound at outer sides of the two exciting windings. The device for suppressing active overvoltage is connected with the composite bypass switch in parallel, the composite bypass switch includes a bidirectional thyristor, a mechanical switch and an electric reactor, and a series branch formed by the electric reactor and the mechanical switch is connected in parallel with the bidirectional thyristor and each single-phase body in the device for suppressing active overvoltage. The device for suppressing active overvoltage eliminates self-excitation of a generator, and can be automatically adjusted to appropriate reactive compensation capacity, thereby eliminating a condition and phenomenon of generation of self-excitation, and creating conditions for direct access of a large unit to a power grid.

Description

technical field [0001] The invention relates to the field of super / ultra-high voltage power grids, in particular to a device for suppressing active overvoltage, a composite bypass switch, a control method and a system. Background technique [0002] EHV / UHV power grid is the backbone grid of my country's power system. Reactive voltage and electromagnetic transient problems are the key factors affecting its safe and stable operation. It is mainly manifested in ①Long line charging has large reactive power, overvoltage and potential supply current problems Prominent, the risk of reclosing failure is high, endangering the safety of the power grid and equipment; ②The large-scale centralized access of clean energy, the power flow changes intensify, and the problem of high / low voltage exceeding the limit is more prominent, which seriously restricts the transmission capacity of the power grid; ③System failures cause The overvoltage may induce large-scale off-grid accidents of new energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/18H02H9/04
CPCH02H9/04H02J3/16H02J3/1835Y02E40/30
Inventor 王轩魏孟刚訾振宁喻劲松曹建春李艳军赵刚袁洪亮付永生赵怡婷孙谊媊于永军
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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