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Reactive power compensation device, method and system for power flow control device

A technology of power flow control and power compensation, applied in reactive power compensation, flexible AC transmission system, AC network voltage adjustment, etc., to maintain voltage stability and prevent overvoltage hazards.

Pending Publication Date: 2022-03-01
STATE GRID ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a reactive power compensation device, method and system for power flow control devices, and solve the problems disclosed in the background technology

Method used

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  • Reactive power compensation device, method and system for power flow control device
  • Reactive power compensation device, method and system for power flow control device
  • Reactive power compensation device, method and system for power flow control device

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Embodiment 1

[0028] This embodiment introduces a reactive power compensation device for a power flow control device, including: a synchronous motor M, a synchronous motor G, a parallel transformer and a series transformer, and when one of the synchronous motor M and the synchronous motor G is a generator , and the other is a motor; the synchronous motor M is connected to the low-voltage side of the parallel transformer, and the high-voltage side of the parallel transformer is connected in parallel to the high-voltage line; the synchronous motor G is connected to the primary side of the series transformer, and the secondary side of the series transformer is connected to the high-voltage line.

[0029] Synchronous motor M and synchronous motor G are two coaxial synchronous motors whose magnetic field windings differ by 90 electrical degrees. The magnetic field winding of synchronous motor M is 90 electrical degrees ahead of the synchronous motor G magnetic field winding designed by this device...

Embodiment 2

[0035] This embodiment provides a control method for a reactive power compensation device for a power flow control device according to Embodiment 1, and its application process specifically involves the following steps:

[0036] 1) In response to the need to increase the reactive power of the access point on the parallel side, issue a reactive power command to the synchronous motor M, rapidly increase the excitation current of the synchronous motor M, and make the electromotive force E of the synchronous motor M M The amplitude is greater than the motor port voltage U M , so that sufficient reactive power compensation can be provided to the system.

[0037] 2) In response to the excessive reactive power of the access point due to the overvoltage of the line caused by the over-compensation of the line itself or the high-voltage line empty / light load on the parallel side, an instruction to absorb reactive power is issued to the synchronous motor M. Rapidly reduce the excitation...

Embodiment 3

[0043] This embodiment provides a control system for a reactive power compensation device for a power flow control device according to Embodiment 1, including:

[0044] The excitation current control module of the synchronous motor M: in response to the need to increase the reactive power of the access point on the parallel side, send a reactive power command to the synchronous motor M, and rapidly increase the excitation current of the synchronous motor M. In response to the excess reactive power of the access point on the parallel side, an instruction to absorb reactive power is issued to the synchronous motor M, and the excitation current of the synchronous motor M is rapidly reduced.

[0045] The invention includes a two-stage synchronous motor, which has fault isolation capability and harmonic suppression capability, provides short-circuit capacity support and voltage support for the power grid through the ability of the synchronous motor M to absorb and generate reactive ...

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Abstract

The invention discloses a reactive power compensation device, method and system for a power flow control device, the device comprises a synchronous motor M, a synchronous motor G, a series transformer and a parallel transformer, when one of the synchronous motor M and the synchronous motor G is a generator, the other one is a motor; the synchronous motor M is connected with the low-voltage side of the parallel transformer, the high-voltage side of the parallel transformer is connected with a high-voltage line in parallel, and the synchronous motor G enables voltage to be connected into the high-voltage line in series through the series transformer. The device comprises two stages of synchronous motors, the synchronous motor M on the parallel side is used for absorbing and generating reactive power, short-circuit capacity support and voltage support are provided for a power grid, system voltage and new energy grid-connected point voltage are maintained to be stable, amplitude-adjustable voltage is output through the synchronous motor G and a series transformer, equivalent impedance of a line is changed, and power flow control is achieved.

Description

technical field [0001] The invention relates to a reactive power compensation device, method and system for a power flow control device, belonging to the technical field of power system stability and control. Background technique [0002] The modern power system is gradually developing towards a high proportion of renewable energy and a high proportion of power electronic equipment. Under the background of "double high", with the emergence of a large number of new loads, the transmission capacity of existing lines is limited, and the large-scale erection of multiple lines lacks sufficient space or economy, new power grid power flow control devices have emerged as the times require. The current power flow control devices are mostly power electronic devices, such as the unified power flow controller (UPFC) of the latest generation of FACTS devices, whose special topology makes the internal fault current easy to spread. In addition, the incorporation of a large number of power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/50H02J3/16H02J3/06
CPCH02J3/50H02J3/16H02J3/06H02J2203/10Y02E40/10Y02E40/30
Inventor 华渊杰许其品杨玲
Owner STATE GRID ELECTRIC POWER RES INST
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