5G-based power distribution network distributed differential protection method and system

Abstract

The invention discloses a 5G-based power distribution network differential protection method and system, and belongs to the technical field of xx. The method comprises the steps: taking two adjacent lines as a protection unit, and locking preceding-stage three-section directional current protection through backward-stage line directional current protection. In the invention, the line protection can also be used as a remote backup of a subordinate line, and the subordinate line has a remote locking function for the protection, so that the three-section current protection part in the new protection scheme can be set when the distributed power supply is not accessed, and frequent change of a protection constant value caused by switching of the distributed power supply is avoided. The scheme is suitable for distributed power supply permeability, virtual impedance is controlled and finely adjusted through the load balance level, the influence of mismatched line impedance on the current load distribution precision is eliminated, the current load output by the energy storage unit is reasonably distributed according to the droop coefficient, the influence of the mismatched line impedance and the energy storage capacity on SOC balance is effectively eliminated, and the expansibility and the universality of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of xx, and in particular relates to a 5G-based distribution network distributed differential protection method and system. Background technique [0002] Due to its simple and reliable principle, current differential protection is widely used as the main protection of centralized parameter components such as generators, transformers, busbars and large motors in power systems. [0003] In the current development process of my country's electric power industry, in order to ensure the normal operation of the electric power system, people apply some new microcomputer protection systems to it, so that the power system will not have related quality problems during the operation process, bringing people With the access of distributed power to the distribution network, the traditional single-power radial distribution network has become a multi-power system, which has completely changed the structure of the power distr...

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Problems solved by technology

[0004] The purpose of the present invention is: in order to solve the problem that with the access of distributed power sources to the distribution network, the traditional single-power radial distribution network becomes a multi-power system, which completely changes the structure of the power distribution system and the original fault characteristics , so that the change of electrical quantity after the fault becomes more complicated, and the traditional protection principle and fault detection method are greatly affected, so that the location of the fault cannot be accurately judged and the traditional relay protection method cannot meet the requirements. The impact of distribution network protection With the access of distributed power sources, the original distribution network has become a multi-power supply system, which will have some adverse effects on the original relay protection in the distribution network. For the downstream protection device, the current flowing through the corresponding protection point increases when a fault occurs downstream, and a 5G-based distributed differential protection method and system for distribution network is proposed

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