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

Abstract

The invention discloses a flexible control system for the closed-loop operation of a power distribution network. The flexible control system is connected in series beside an intermediate point interconnection switch of a power distribution network power supply line of two different power supplies, and comprises a three-phase AC-DC-AC converter, the three-phase AC-DC-AC converter is connected between a parallel transformer and a series transformer, and the parallel transformer is connected with a primary power supply line and is used for reducing the voltage of the primary power supply line and then connecting the voltage to the three-phase AC-DC-AC converter to provide an AC power supply for the three-phase AC-DC-AC converter. The series transformer couples the output voltage of the three-phase AC-DC-AC converter to a closed-loop point of a closed-loop line of the power distribution network. According to the invention, the controllable voltage is connected in series in the power supply line to compensate the voltage difference of the closed-loop line, the accurate vector compensation can be realized for the voltage phase and amplitude of different secondary power supply lines, and the overcurrent in the closed-loop operation process is effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of power system distribution automation, and in particular relates to a flexible control system for closed-loop operation of a 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 are of great help to improve the reliability of distribution network power supply, the o...

AI Technical Summary

Problems solved by technology

Although this loop closing operation mode can reduce the risk of overcurrent tripping caused by circulating current during long-term loop closing operation, there is a short-term load interruption after a power supply side loses power, which has a great impact on power supply reliability.

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