A multifunctional electric section switch for a substation and a control method thereof

By adopting a voltage tracking method using back-to-back three-phase full-bridge AC/AC converters and parallel switches, as well as a high-frequency small-signal impedance method, the problem of prolonged power loss of substation equipment due to transient faults was solved. This enabled automatic phase verification and fault detection with automatic transfer switching, ensuring normal power supply to the equipment.

CN118487372BActive Publication Date: 2025-11-18STATE GRID FUJIAN ELECTRIC POWER CO LTD +1
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Patent Information

Application Number
CN202410517773.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-04-28
Publication Date
2025-11-18
Estimated Expiration
2044-04-28

AI Technical Summary

Technical Problem

The existing substation power sectionalizing switches have limited functionality and cannot achieve automatic phase matching and fault detection with automatic transfer switching, resulting in prolonged power outages for AC equipment within the substation due to momentary faults.

Method used

A back-to-back three-phase full-bridge AC/AC converter and parallel switch are used to achieve asynchronous paralleling of the AC bus through voltage tracking. The impedance method with injected high-frequency small signal is used to determine the fault type. When the controller determines that it is a transient fault, it will activate the automatic transfer function.

Benefits of technology

It enables asynchronous paralleling of AC busbars and accurate identification of fault types, avoiding prolonged power outages of substation equipment due to transient faults and ensuring normal power supply to the equipment.

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Abstract

The application provides a multifunctional electric section switch for a transformer substation and a control method thereof, comprising a back-to-back three-phase full-bridge AC / AC converter and a parallel switch; voltage output ends of the three-phase full-bridge AC / AC converter are respectively connected with filter inductors and the parallel switch; the parallel switch comprises a plurality of anti-parallel controllable high-frequency switches; the three-phase full-bridge AC / AC converter comprises a plurality of anti-parallel diode controllable high-frequency switches; and the technical scheme can effectively solve the problem of long-time power failure of the electric equipment of the transformer substation caused by instantaneous faults.
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