Method and system for coordinate control of voltage and reactive power of phase regulator and UHVDC convert station

An ultra-high voltage DC, voltage reactive power technology, applied in reactive power adjustment/elimination/compensation, reactive power compensation, AC network circuits, etc.

Active Publication Date: 2019-01-04
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are not many reactive power coordinated control methods involving condensers and DC transmission. For example, the Chinese patent document with application number 201710307415.7 discloses a reactive power coordinated control method for AC filters and condensers in DC converter stations. The time-swit...

Method used

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  • Method and system for coordinate control of voltage and reactive power of phase regulator and UHVDC convert station

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Embodiment Construction

[0054] Such as figure 1 As shown, the implementation steps of the voltage and reactive power coordination control method between the regulator and the UHV DC converter station in this embodiment include:

[0055] 1) When the DC power transmission is started and the condenser is put into operation and the operation is stable, skip to step 2);

[0056] 2) Determine whether there is a switching filter command for DC transmission control, if there is a switching filter command, skip to step 3);

[0057] 3) Determine whether the switching filter command is a switching filter command, if it is a switching filter command, then skip to step 4); if it is a switching filter command, then jump to step 5);

[0058] 4) Calculate the first deviation ΔUc between the estimated target voltage and the initial voltage target after a small group of filter inputs and corresponding reactor switching 1 , to obtain the first deviation ΔUc between the estimated target voltage and the initial voltage...

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Abstract

A method and system for coordinate control of voltage and reactive power of a camera and an UHVDC convert station. The method comprises steps of keeping the AC filter bank switching strategy of DC control and protection system unchanged, Obtain the filter of DC control and protection, the switch instruction of reactor group, the operation mode and related control parameters and the operation stateof the adjuster, adjust the control target of the adjuster according to the switch instruction of DC control and protection, and intervene the switch instruction of AC capacitor and reactor output byDC control and protection. As that invention is base on the reactive power control of the UHVDC transmission and the exist control mode of the camera, The utility model can reduce the bus voltage fluctuation when the AC filter bank is switched on and off, reduce the switching times of the capacitor and the reactor bank, prolong the service life of the AC capacitor and the reactor, and at the sametime, do not need to change the DC control protection and the internal control logic of the adjuster, so that the utility model is convenient to implement.

Description

technical field [0001] The present invention relates to power system operation and control technology, in particular to a method and system for coordinating control of voltage and reactive power between a regulator and an UHV DC converter station, which is used to realize the regulator and the DC converter in an UHV converter station considering the current control status. Coordinated control of voltage / var between AC filter banks controlled by the control protection system. Background technique [0002] As a long-distance and large-capacity power transmission method, HVDC transmission has great advantages over traditional AC transmission in terms of construction economy and operation loss, but its operation needs to consume a lot of reactive power and generate a lot of harmonics, so it is especially A large number of reactive power devices need to be configured in the high-voltage converter station. Generally, AC filters, capacitors and reactor groups are configured, and re...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCH02J3/1864H02J3/1885Y02E40/30
Inventor 洪权宋军英吴晋波郭思源朱维钧刘海峰李辉李理徐浩敖非梁文武李刚臧欣余斌刘宇潘伟
Owner STATE GRID HUNAN ELECTRIC POWER
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