Non-contact point ring method and system

By using a non-tethering point loop-closing method controlled by series transformers and inverters, the problems of equipment overload and power outage risks in distribution network loop-closing operations are solved, achieving low-cost, high-efficiency load transfer and improved power supply reliability.

CN115940140BActive Publication Date: 2026-07-17NARI TECH CO LTD
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Patent Information

Application Number
CN202211506441.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-29
Publication Date
2026-07-17
Estimated Expiration
2042-11-29

AI Technical Summary

Technical Problem

Existing power distribution networks suffer from problems such as equipment overload, inrush current, and power flow circulation during loop closing operations, leading to equipment safety threats and power outage risks, especially insufficient power supply reliability during load transfer.

Method used

By adopting a non-connection point loop closing method, the current and voltage of the series transformer are controlled through the series transformer and inverter to achieve uninterrupted power supply. The series transformer is used to withstand the voltage difference to control the large power flow. Combined with the series circuit breaker and bypass switch, the safe operation of the equipment is ensured.

Benefits of technology

It enables the control of high-power flow with low-capacity equipment, reduces equipment costs and floor space, improves power supply reliability, avoids equipment overload and power outage risks, and ensures equipment operation reliability.

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Abstract

The application discloses a non-contact point loop closing method and system, which is applied to a power distribution network loop closing control device, receives a non-contact point loop closing instruction, closes a series circuit breaker, measures a power distribution network contact switch current, controls a series transformer secondary side current to be equal to the contact switch current through an inverter, disconnects the power distribution network contact switch, measures a first substation access point voltage U1 and a second substation power supply voltage U2s, controls the series transformer secondary side voltage to be equal to U2s-U1 through the inverter, so that the voltage across the second substation power supply circuit breaker is equal, closes the second substation power supply circuit breaker, the inverter stops outputting, and the non-contact point loop closing is completed. Advantages: the application has the advantages of high regulation ratio, low equipment cost and small occupied area, provides the non-contact point loop closing method, avoids loop closing impact and loop current, and can realize non-power-off power supply when the power supply of a power-off substation needs to be restored to supply power to the substation load, thereby improving power supply reliability.
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Citation Information

Patent Citations

  • Flexible control system for closed-loop operation of power distribution network

    CN113270864A

  • Suture-ring-free electricity conversion device and method for improving waveform quality of device

    CN113904323A