Method and device for suppressing oscillation of multi-feeder alternating-current/direct-current flexible interconnection system

An interconnected system, AC and DC technology, applied in the parallel operation of DC power supply, reducing/preventing power oscillation, etc., can solve the problems of poor suppression ability and inability to suppress interval oscillation, achieve suppression of interval oscillation, improve overall suppression ability, and facilitate access Effect

Pending Publication Date: 2021-03-19
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned deficiencies in the prior art that cannot suppress inter-area oscillations and have poor suppression capabilities, the present invention provides a method for suppressing oscillations of a multi-feeder AC / DC flexible interconnection system, including:

Method used

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  • Method and device for suppressing oscillation of multi-feeder alternating-current/direct-current flexible interconnection system
  • Method and device for suppressing oscillation of multi-feeder alternating-current/direct-current flexible interconnection system
  • Method and device for suppressing oscillation of multi-feeder alternating-current/direct-current flexible interconnection system

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Embodiment 1

[0061] Embodiment 1 of the present invention provides a method for suppressing oscillation of a multi-feeder AC-DC flexible interconnection system, the specific flow chart is as follows figure 1 As shown, the specific process is as follows:

[0062] S101: Determine a preset additional oscillation damping control instruction of the additional damping controller based on the acquired active power deviation and reactive power deviation of line transmission;

[0063] S102: Determine the current reference value of the multi-feeder AC-DC flexible interconnection system based on the additional oscillation damping control command, the measured active power value and the measured reactive power value of the multi-feeder AC-DC flexible interconnection system;

[0064] S103: Determine the voltage reference value of the multi-feeder AC-DC flexible interconnection system based on the current reference value of the multi-feeder AC-DC flexible interconnection system;

[0065] S104: Suppress...

Embodiment 2

[0086] Based on the same inventive concept, embodiment 2 of the present invention also provides a multi-feeder AC-DC flexible interconnection system oscillation suppression device, including:

[0087] The first determination module is used to determine the preset additional oscillation damping control instruction of the additional damping controller based on the acquired active power deviation and reactive power deviation of line transmission;

[0088] The second determination module is configured to determine the current reference value of the multi-feeder AC-DC flexible interconnection system based on the additional oscillation damping control command, the measured active power value and the measured reactive power value of the multi-feeder AC-DC flexible interconnection system;

[0089] The third determination module is configured to determine the voltage reference value of the multi-feeder AC-DC flexible interconnection system based on the current reference value of the mul...

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Abstract

The invention provides a method and a device for suppressing oscillation of a multi-feeder alternating-current / direct-current flexible interconnection system. The method comprises the following stepsof: determining a preset additional oscillation damping control instruction of an additional oscillation damping controller; determining a current reference value of the multi-feeder AC / DC flexible interconnection system; and determining a voltage reference value of the multi-feeder AC / DC flexible interconnection system. The oscillation of the multi-feeder AC-DC flexible interconnection system issuppressed, local oscillation can be suppressed and interval oscillation can also be suppressed by adding the oscillation damping control instruction, the dynamic performance of the multi-feeder AC-DCflexible interconnection system is improved, the operation stability of the multi-feeder AC-DC flexible interconnection system is improved, and the power transmission capability of the multi-feeder alternating-current and direct-current flexible interconnection system and the safety of the generator are ensured. The active power deviation and the reactive power deviation which are convenient to obtain and transmitted by the line are used as the input of the additional oscillation damping controller, and meanwhile, the additional oscillation damping control instruction is superposed on the power outer loop control link, so that the response speed is high, and the universality is higher.

Description

technical field [0001] The invention relates to the technical field of AC and DC oscillation suppression, in particular to a method and device for suppressing oscillation of an AC / DC flexible interconnection system with multiple feeders. Background technique [0002] As an important form and key component of the future power grid, the multi-feeder AC-DC flexible interconnection system can realize efficient energy exchange and coordinated dispatch between AC and DC grids, as well as wide-area interconnection, transmission and consumption of large-scale renewable energy. However, the large-scale connection of wind power, photovoltaic and other new energy units has significantly increased the complexity and uncertainty of the operation oscillation of the multi-feeder AC-DC flexible interconnection system. The oscillation of multi-feeder AC-DC flexible interconnection system and its chain reaction have caused great harm to the safe and stable operation of the system. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J1/10
CPCH02J1/10H02J3/24
Inventor 沙广林段青盛万兴段祥骏赵彩虹马春艳傅鲁敏郑义
Owner CHINA ELECTRIC POWER RES INST
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