Four-terminal flexible direct-current interconnection double-loop network power distribution system

Abstract

The invention discloses a four-end flexible direct-current interconnection double-loop network power distribution system, which is characterized in that flexible direct-current interconnection devices are connected among alternating-current lines to form interconnection channels among four-end alternating-current lines, so that an urban medium-voltage alternating-current power distribution network operates in a closed-loop manner, and on the premise that short-circuit current is not increased, the power distribution efficiency is improved. Energy mutual supply and on-line hot standby of multiple power supplies are realized, the power supply efficiency and the power supply reliability of the system are improved, and the power supply pressure of the power distribution network is effectively relieved. When the system operates normally, the device can adjust the power distribution in the system according to a scheduling instruction, thereby reducing the loss and improving the operation efficiency of a power grid. When the system operates abnormally or fails, the device can quickly emit dynamic active power or reactive power to support a power grid to provide dynamic active power or reactive power support, so that the stability of the system is improved; after the fault is removed, the flexible looped network control device can help the system to recover quickly, and fault deterioration is avoided.

Description

Technical field [0001] The present invention belongs to the field of power system control technology, and specifically, a four-terminal flexible DC interconnected double-ring network distribution system. Background technique [0002] The current power system is composed of complex power networks between the power network as the main body and the different voltage levels, and realizes the development, loss, and equality tasks of electricity in the system. Among them, the distribution network is an important part of the connection-transmission system or power system and the user is an important infrastructure that implements and guarantees power supply quality and power supply. In order to limit the short circuit capacity of the power system, avoid the appearance of the electromagnetic ring network, high voltage distribution network in the same region, usually use the method of partition operation, and the contact switch between different regions is in normal operation. Disconnect....

AI Technical Summary

Problems solved by technology

[0005] Aiming at a series of challenges brought about by the current demand for closed-loop operation of the AC distribution network and the problem that the application structure of the back-to-back flexible ring network device in the distribution network is still unclear, the present invention provides a four-terminal flexible DC interconnected double-ring network power distribution system

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