Intelligent closed-loop switch of power distribution network

Abstract

The invention relates to an intelligent closed-loop switch of a power distribution network. The intelligent closed-loop switch comprises a closed-loop switch and an intelligent regulator, wherein theclosed-loop switch is used for disconnecting or closing a power distribution ring network, the intelligent regulator is used for controlling the closed-loop switch to be switched off or switched on, the intelligent regulator comprises a communication module, a power adjustment module and a controller, the communication module is in communication connection with a ring main unit of each node of thepower distribution ring network, the power adjustment module is used for adjusting voltage difference of two ends of the closed-loop switch, and the controller is connected with the communication module, the power adjustment module and the closed-loop switch. The intelligent closed-loop switch has the beneficial effects that the intelligent regulator of the intelligent closed-loop switched of thepower distribution network comprises two AC power supplies comprising a series power supply and a parallel power supply, the series power supply is directly connected in series with a power distribution network line and is directly superposed onto a line power supply by adjusting amplitude and phase of an output voltage, the amplitude and the phase of the voltage difference of the two ends of theloop-closed point reach design requirement of loop-closed running, the closed-loop switch is switched on, and closed-loop running of the line is achieved.

Description

technical field [0001] The invention relates to the technical field of distribution network, in particular to an intelligent loop closing switch of distribution network. Background technique [0002] In recent years, with the development of economy and society, people have higher and higher requirements for power supply reliability. The distribution network is directly facing the users, and its impact on the reliability of power supply cannot be ignored. After long-term development of my country's distribution network, the power supply mode of "closed-loop design, open-loop operation" has been generally formed, and on this basis, measures such as distribution automation, equipment management, load transfer, power outage management, and transformer load management have been implemented to ensure Reliable power supply. Although these measures have greatly improved the reliability of distribution network power supply, the power supply mode of open-loop operation still cannot a...

AI Technical Summary

Problems solved by technology

[0004] However, if there is a voltage difference on both sides of the loop closing point or the short-circuit impedance on both sides is different, a circulating current will be generated after the loop is closed, and a large inrush current will appear at the moment of the loop closing, which may cause protection actions and affect the safe and stable operation of the power grid.

If the operator judges whether the ring can be closed only based on the operating experience, and lacks test or simulation verification, it is possible that the protection will malfunction due to excessive ring closing current, which will cause a wider range of power outages

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