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Phase modifier and static var compensator coordination control method and system

A technology of static reactive power compensation and coordinated control system, applied in reactive power compensation, reducing/preventing power oscillation, adjusting AC network voltage, etc., it can solve the problem that the system voltage cannot be quickly restored to a stable state, etc.

Active Publication Date: 2019-04-30
CHINA ELECTRIC POWER RES INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem in the prior art that the system voltage cannot quickly return to a stable state after a fault occurs, the present invention provides a method and system for coordinated control of a regulator and a static var compensator

Method used

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  • Phase modifier and static var compensator coordination control method and system
  • Phase modifier and static var compensator coordination control method and system
  • Phase modifier and static var compensator coordination control method and system

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Embodiment 1

[0054] figure 1 It is a flow chart of the coordinated control method of the condenser and the static var compensator of the present invention, such as figure 1 As shown, the present invention provides a coordinated control method for a regulator and a static var compensator, including:

[0055] When the AC-DC system is in a steady state, compare the reactive power collected in advance with the reactive power reference value, determine the power state of the AC-DC system, and formulate a coordinated control strategy for the regulator and the static var compensator according to the power state;

[0056] When the AC-DC system is in a transient state, compare the pre-collected system voltage with the system voltage reference value to determine the power state of the AC-DC system, and formulate a coordinated control strategy for the condenser and the static var compensator according to the power state.

[0057] When the AC and DC system is in a steady state, compare the pre-collec...

Embodiment 2

[0079] Based on the same inventive concept, the present invention also provides a coordinated control system for the regulator and the static var compensator, including:

[0080] A coordinated control system for a condenser and a static var compensator, comprising:

[0081] Steady-state adjustment module: used to compare the pre-collected reactive power and reactive power reference value when the AC-DC system is in a steady state, determine the power state of the AC-DC system, and formulate the power conditioner and static reactive power according to the power state The first coordinated control strategy of the compensator;

[0082] Transient adjustment module: used to compare the pre-collected system voltage and the system voltage reference value when the AC and DC system is in a transient state, determine the power state of the AC and DC system, and formulate the regulator and static var compensator according to the power state The second coordinated control strategy.

[0...

Embodiment 3

[0102] Using the detected electric quantity of electric operation, the feedback signal such as voltage and reactive power is obtained by comparing and analyzing with the reference value, and it is judged whether the regulator and the static var compensator are suitable for the coordinated operation control scheme put into the system, such as Figure 9 shown.

[0103] First, output a signal for the detected AC and DC system voltage and system reactive power. After comparing with the reference value, it is judged whether the system lacks reactive power or has too much reactive power at this time, so as to determine whether the static var compensator and the regulator Whether the camera needs to be put into the system, if so, whether to absorb reactive power into the system or output reactive power, and whether to put in the static var compensator or the camera first.

[0104] When the system is in a steady state process, the input of the static var compensator is firstly control...

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Abstract

Disclosed are a phase modifier and static var compensator coordination control method and system. The method includes the following steps: when an alternating current-direct current system is in a steady state, comparing system reactive power with a reactive power reference value, determining a power state of the alternating current-direct current system, and making a first cooperation control strategy of a phase modifier and a static var compensator according to the power state; and when the alternating current-direct current system is in a transient state, comparing system voltage and a voltage reference value, determining a power state of the alternating current-direct current system, and making a second cooperation control strategy of the phase modifier and the static var compensator according to the power state. The phase modifier and static var compensator coordination control method and system can fully utilize the ability of the cooperation control of the phase modifier and thestatic var compensator to provide reactive power and voltage support for the alternating current-direct current system for different working conditions. The strategy method provided by the inventioncan be used for dynamic reactive power compensation of the system by reactive power compensation device to effectively switch the phase modifier and the static var compensator, and so the phase modifier and the static var compensator can support the system voltage to a greater extent.

Description

technical field [0001] The invention belongs to the application field of static var compensation of a synchronous condenser and a static var compensator in an ultra-high voltage direct current transmission system, and in particular relates to a coordinated control method and system for a condenser and a static var compensator. Background technique [0002] With the improvement of the DC transmission capacity and voltage level in the AC-DC system, the demand for reactive power of the converter station is gradually increasing, especially in the dynamic process of the power grid, the problems of reactive power support capability and voltage stability are becoming more and more serious. Both the condenser and the static var compensator can provide reactive power support for the converter station, but the different principles of reactive power generation between the two lead to different dynamic responses, which makes their operating characteristics and the ability to provide reac...

Claims

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Application Information

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IPC IPC(8): H02J3/16H02J3/24H02J3/50
CPCH02J3/16H02J3/24H02J3/50Y02E40/30
Inventor 范士雄韩巍姚伟锋刘幸蔚卫泽晨王伟李立新行舟王玮张鹏秦杰许国瑞赵海森
Owner CHINA ELECTRIC POWER RES INST
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