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Comprehensive control method and system for ensuring voltage safety in power recovery stage of multi-infeed direct-current system

A multi-infeed DC and power recovery technology, applied in the direction of AC network voltage adjustment, AC-DC network circuit layout, AC network circuit, etc., can solve problems such as AC voltage drop, achieve AC voltage drop, improve recovery efficiency, and minimize The effect of the voltage offset

Active Publication Date: 2020-04-24
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of AC voltage reduction caused by the power recovery of the multi-infeed DC system, the present invention proposes a comprehensive control method and system for ensuring voltage safety during the power recovery stage of the multi-infeed DC system, which can ensure the safety of the power recovery stage of the multi-infeed DC system. Voltage security and improved recovery efficiency

Method used

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  • Comprehensive control method and system for ensuring voltage safety in power recovery stage of multi-infeed direct-current system
  • Comprehensive control method and system for ensuring voltage safety in power recovery stage of multi-infeed direct-current system
  • Comprehensive control method and system for ensuring voltage safety in power recovery stage of multi-infeed direct-current system

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Embodiment 1

[0032] The reactive power level of the system is the main factor affecting the node voltage during the power recovery process of the multi-infeed DC system. Therefore, the variables that determine the node voltage are: the reactive power absorbed by the DC inverter and the reactive power generated by the reactive power compensation device. The reactive power absorbed by the DC system is directly related to the active power recovered by the DC system, so the reasonable regulation of the power recovery amount of each DC system at each time step can ensure the voltage safety of the nodes and improve the recovery speed; the DC power recovery at each time step After the completion, it will inevitably cause a certain voltage deviation. The reactive power compensation equipment in the reasonable increase input system can minimize the voltage deviation caused by the DC power recovery and keep the voltage constant. In addition, there are interactions between DC systems in multi-infeed ...

Embodiment 2

[0097] In one or more embodiments, a comprehensive control system for ensuring voltage safety in the power recovery stage of a multi-infeed DC system is disclosed, including:

[0098] means for establishing the power flow equation of the AC-DC system according to the initial state at each time step;

[0099] means for obtaining the sensitivity matrix of the node voltage with respect to the active power delivered by the DC system, and the means for obtaining the sensitivity matrix of the node voltage with respect to the reactive power emitted by the reactive compensation device;

[0100] A device for establishing a DC active power restoration optimization model constrained by the voltage deviation of all nodes within a safe range according to the sensitivity matrix of the node voltage with respect to the DC active power; used to solve the model to obtain voltage safety at each time step The device of the optimal recovery amount of active power of each DC system under ;

[0101...

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Abstract

The invention discloses a comprehensive control method and system for ensuring voltage safety in a power recovery stage of a multi-infeed direct-current system. The method comprises the steps of linearizing a power flow equation of an alternating-current and direct-current system to obtain a sensitivity matrix of node voltage about direct-current transmission active power and reactive power emitted by a reactive power compensation device; establishing a direct-current power recovery optimization model taking the node voltage deviation value as a constraint in a safety range, and solving to obtain the optimal power recovery amount of each direct-current system in each time step on the premise of voltage safety; and establishing a reactive power compensation device increment optimization model taking the minimum node voltage deviation value as a target, and solving to obtain the optimal increment of each reactive power compensation device after the direct-current power recovery of each time step is completed, so that the node voltage deviation caused by the direct-current power recovery is reduced to the minimum. According to the invention, the power recovery control of the multi-infeed direct-current system can be guided on line so as to fully ensure the voltage safety and recovery efficiency of the recovery process.

Description

technical field [0001] The invention relates to the technical field of DC system power recovery, and in particular to a comprehensive control method and system for ensuring voltage safety during the power recovery stage of a multi-feed DC system. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Due to the dense DC drop points in the multi-infeed DC system, the electrical coupling is enhanced, and its operating mechanism is more complicated. At present, domestic and foreign power grids have very little experience in recovery operations after a large outage of multi-infeed DC systems. Generally, the AC system is restored first, and the DC system is restored last. However, the DC system has the advantages of large transmission capacity and fast power regulation. If the recovery ability of the DC system can be fully utilized during the system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/16H02J3/24H02J4/00
CPCH02J3/00H02J3/16H02J3/24H02J4/00Y02E40/30Y04S10/52
Inventor 王洪涛杨善栋刘玉田杨冬马欢赵康
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY