An alternating current system controllable energy dissipation device and application method thereof

By designing a controllable energy dissipation device for AC systems, and utilizing a combination of energy dissipation modules and control modules, energy dissipation units are gradually connected to suppress overvoltage or undervoltage. This solves the problem that AC system overvoltage suppression methods are prone to oscillation and control complexity, and improves the stability and safety of the system.

CN114597904BActive Publication Date: 2026-05-29GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
Filing Date
2022-03-01
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In the prior art, AC system overvoltage suppression methods are prone to system oscillation and have high control requirements, making it difficult to effectively suppress overvoltage, especially in weak AC systems.

Method used

A controllable energy dissipation device for AC systems is provided. It combines multiple energy dissipation modules and control modules, and uses bypass switches and energy dissipation units connected in series and parallel. The energy dissipation sub-units are gradually connected according to the voltage state to suppress overvoltage or undervoltage. A two-stage or multi-stage control method is adopted to realize the flexible adjustment of the energy dissipation device.

Benefits of technology

It effectively suppresses overvoltage and undervoltage in AC systems, avoids system oscillation, reduces control complexity, and improves system stability and safety. It is suitable for weak AC systems.

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Abstract

The application discloses an alternating current system energy dissipation device and an application method. The device comprises: a first energy dissipation unit and a second energy dissipation unit connected in series, and the second energy dissipation unit is connected with bypass switches. When overvoltage of the alternating current system occurs, a control module is connected in a two-stage control connection mode or a multi-stage control connection mode, the on-off states of the bypass switches are controlled, the energy dissipation subunits are gradually connected to an alternating current bus, and overvoltage of the alternating current system is suppressed. When fault under-voltage of the alternating current system occurs, the control module is connected in the multi-stage control connection mode, the on-off states of the bypass switches are controlled, the energy dissipation subunits are gradually connected to the alternating current bus, and overvoltage of the alternating current system is suppressed. Therefore, only the bypass switches are used to gradually connect the energy dissipation module to the alternating current bus, and overvoltage of the alternating current system is suppressed.
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