Collaborative architecture and collaborative method of power distribution protection with flexible interconnection devices

Abstract

A distribution protection collaborative architecture including a flexible interconnection device, a device, and a collaboration method. Under a frame of collaborative control, the rapid state sensing of a power electronic device of the alternating current (AC) and direct current (DC) flexible interconnection device and the AC side feeder protection control device are used to achieve rapid fault locating and fault removal, enabling rapid self-recovery of a region fault of a full AC and DC system. The present invention is proposed to achieve, by means of a GOOSE communication network based on region high-speed information interaction, global information high-speed communication of smart devices, including the flexible DC interconnection device, in the same AC and DC system, and automatically realize rapid fault locating and isolation of a protection device according to a pre-set condition. With respect to a protection configuration manner of a traditional power distribution system, the present invention has a higher fault handling speed and a better collaborative fault handling capability.

Description

technical field [0001] The invention relates to a collaborative framework and a collaborative method for power distribution protection including flexible interconnection devices, and belongs to the technical field of electric power systems and automation thereof. Background technique [0002] Research results in recent years have shown that the AC-DC hybrid distribution network based on flexible DC technology is more suitable for the development of modern urban distribution networks. The AC-DC hybrid distribution network can better accommodate distributed power sources and DC loads, and can alleviate the contradiction between limited corridors of urban power grid sites and high load density. loss. Therefore, the AC-DC hybrid distribution network is an important development trend of the distribution network, which can effectively improve the power quality, reliability and operating efficiency of the urban power distribution system. At present, for the fault characteristics ...

AI Technical Summary

Problems solved by technology

If the traditional distributed protection and control device is used, the system information that each protection and control device can obtain is limited, and it cannot cooperate with the flexible interconnection device to make a quick judgment, and it is impossible to make an accurate and fast judgment on the failure of the entire AC and DC system

Some scientific research institutes proposed to use the centralized decision-making mode to add a main protection controller in the AC-DC hybrid system, and collect the protection action information of the full AC-DC system through the protection main controller, including the action information of the flexible interconnection device, so as to realize the full protection. The wide-area protection of the system realizes fault location and isolation; however, the protection form has high requirements on communication, and the main protection controller requires the status information of the protection measurement and control devices of the whole station. It is also necessary to issue an export command to the relevant protection measurement and control devices, the speed is slow, and the safety cannot be well satisfied.

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