A Coordinated Control Method for Low-Voltage Current-Limiting Links in Multi-circuit DC Systems

A DC system, coordinated control technology, applied in the direction of AC network voltage adjustment, power transmission AC network, reactive power compensation, etc., can solve commutation failure, reactive power voltage stability, adverse effects of transient stability, and affect the recovery of other DC systems and other issues to achieve the effect of promoting coordinated recovery and reducing the risk of commutation failure

Active Publication Date: 2022-07-19
STATE GRID JIANGSU ECONOMIC RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multiple DCs are intensively connected to the same AC grid, forming a much more complex multi-infeed system, which poses new challenges to the safe and stable operation of the power system
Commutation failure is one of the most common faults in DC transmission systems. Single commutation failure and continuous commutation failure will have adverse effects on DC line power transmission, reactive voltage stability, transient stability, etc.
In the multi-infeed DC system, due to the complex reactive power interaction among the various DC systems, the transient characteristics during the DC restoration process of this circuit will affect the recovery of other DC systems and even cause additional commutation failures.

Method used

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  • A Coordinated Control Method for Low-Voltage Current-Limiting Links in Multi-circuit DC Systems
  • A Coordinated Control Method for Low-Voltage Current-Limiting Links in Multi-circuit DC Systems
  • A Coordinated Control Method for Low-Voltage Current-Limiting Links in Multi-circuit DC Systems

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Embodiment Construction

[0074] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0075] A coordinated control method for a low-voltage current-limiting link of a multi-circuit DC system, comprising the following steps:

[0076] Calculate the degree of influence of each return-to-DC system on the AC-DC hybrid grid;

[0077] Calculate the reactive power and voltage sensitivity between the converter stations of each return-to-DC system;

[0078] Determine the control strategy and related parameters of the coordinate...

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Abstract

The invention discloses a coordinated control method for low-voltage current-limiting links of a multi-circuit direct current system, and relates to the technical field of power system control. The method first comprehensively considers two factors of active power and reactive power, and evaluates the effect of each circuit direct current system on an alternating current and direct current hybrid power grid. secondly, calculate the reactive power and voltage sensitivity between the converter stations of each DC system; finally, determine the control strategy and related parameters of the coordinated control method of the low-voltage current-limiting link based on the above calculation results. The impact of reactive power interaction can effectively reduce the risk of commutation failure due to reactive power interaction, thereby promoting coordinated recovery of the multi-circuit DC system.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to a coordinated control method for a low-voltage current-limiting link of a multi-circuit direct current system. Background technique [0002] my country's energy centers and load centers of gravity have the characteristics of reverse distribution in geography. In order to effectively solve the problem of cross-regional energy transmission, the HVDC transmission system based on the grid commutation converter type is obtained because of its advantages in large-capacity and long-distance transmission. a wide range of applications. Multiple DCs are intensively connected to the same AC power grid, forming a much more complex multi-feed system, which poses new challenges to the safe and stable operation of the power system. Commutation failure is one of the most common faults in HVDC transmission systems. Single commutation failure and continuous commutation fai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/36H02J3/16Y02E60/60
Inventor 朱寰张文嘉黄成辰赵菲菲李辰汤奕王玉荣郑晨一
Owner STATE GRID JIANGSU ECONOMIC RES INST
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