Static var corrector

A technology of power consumption and controller, applied in the direction of reducing/preventing power oscillation, adjusting/eliminating/compensating reactive power, sequence/logic controller, etc.

Inactive Publication Date: 2012-06-06
AMERICAN SUPERCONDUCTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this reactor-capacitor coupling does not prevent resonance under low voltage conditions (for example, when reactive power from the SVC is expected to restore the utility line voltage after a temporary blackout or voltage sag)

Method used

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Examples

Experimental program
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Embodiment Construction

[0030] System Overview

[0031] refer to figure 1 , shows a power compensation system 100 connected to a three-phase alternating current (AC) transmission line 110 on a utility power network. Typically, the AC transmission line 110 transmits an electrical signal in the form of a sine wave in each of the three phases A, B, and C at a fixed frequency (eg, 60 Hz), and the line voltage V line Typically in the operating range of 4.1kV to 34.5kV.

[0032] The power compensation system 100 includes a static var corrector 120 and a switch controller 150 . It is common for the SVC 120 to be configured to provide power compensation to the transmission line 110 in a controlled amount, typically determined by the switch controller 150 based on line conditions. Here, SVC 120 may provide controlled power flow for regulating utility line voltage, improving network stability, and / or correcting power factor on transmission line 110, depending on the particular application. For illustrati...

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PUM

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Abstract

Disclosed is a static VAR corrector. A system for providing reactive power compensation to a utility power network includes a switch coupled to the utility power network, and a capacitor coupled with the switch for providing a controlled amount of reactive current based on conditions of the utility power network. The system also includes a switchable power dissipation device coupled in series to the capacitor and configured to provide a preselected amount of impedance to the reactive current for a predetermined duration when a line voltage on the utility power network drops below a threshold.

Description

technical field [0001] This application relates to static var correctors (SVC). Background technique [0002] Static Var (VAR) correctors (also known as Static Var Compensators) are electrical devices that provide reactive compensation to the transmission network. SVCs are commonly used in a variety of applications including, for example, regulating utility line voltage, improving network steady state stability, and establishing near unity power factor on transmission lines. [0003] Typically, an SVC includes a bank of controllable capacitors that can be switched in and out of the circuit, respectively, by a bank of semi-conducting switches, such as thyristors. Each switch is driven by an electrical gating signal generated based on line conditions, allowing the corresponding capacitor to discharge and conduct in a controlled manner. When using thyristor switches capable of responding to gating signals within sub-cycles (eg, on the order of milliseconds), SVCs can provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18G05B19/04
CPCH02J3/1864H02J3/24Y02E40/12H02J3/00125Y02E40/10
Inventor 林恩·约翰逊
Owner AMERICAN SUPERCONDUCTOR
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