Fault inversion-based extra-high voltage direct-current protection device and system

Abstract

The invention discloses a fault inversion-based extra-high voltage direct-current protection device and system. The method includes the following steps that: S1, the historical fault information of adirect-current transmission system is acquired and synchronized; S2, corresponding fault inversion configuration information is determined: a protection measurement point table, a control and protection information point table and a protection constant value table are established; S3, a protection function type to be tested is selected; S4, test quantity data under a corresponding fault operationstate and direct-current control system control information data are generated based on the fault inversion configuration information according to the protection function type to be tested, and the test quantity data and direct-current control system control information data are transmitted to an extra-high voltage direct-current protection device to be tested; S5, protection logic operation and pre-judgment are performed to obtain the theoretical action behavior data of the direct-current protection device to be tested; S6, the actual action behavior data of the protection device to be testedare obtained; and S7, the actual action behavior data are compared with the theoretical action behavior data, so that the whether the corresponding protection function of the direct-current protection device to be test meets requirements can be judged. With the fault inversion-based extra-high voltage direct-current protection device and system of the invention adopted, the extra-high voltage direct-current protection device can be independently and effectively tested, and a guarantee can be provided for the long-term safe and stable operation of the direct-current protection system.

Description

technical field [0001] The invention relates to the technical field of testing UHV DC protection devices, in particular to a method and system for testing UHV DC protection devices based on fault inversion. Background technique [0002] The UHV DC transmission project is being vigorously developed and constructed in my country and overseas. The voltage level is continuously increased from 500kV to 800kV, and then to 1100kV, and the transmission power is also increasing. [0003] The DC protection system is the safety guard of the UHV DC transmission system. It monitors the operating status parameters of the converter, DC pole line and neutral line, DC filter and other equipment and areas in real time, and quickly protects the electrical equipment and DC lines in the converter station from damage. Damaged by electrical faults plays an important role in the safe and stable operation of the entire DC transmission system. [0004] At present, the test of the DC protection syste...

AI Technical Summary

Problems solved by technology

[0004] At present, the test of the DC protection system is mainly to carry out the centralized joint debugging test in the factory before leaving the factory. Since the DC control system and the DC protection system need to cooperate with each other and have a high degree of coupling, the real-time digital simulation system is used for the centralized joint debugging of the DC control system. and the overall function test of the DC protection system, the test system and equipment are huge and complex

The commissioning and operation and maintenance stages of the project site lack effective test techniques and means. Generally, the manufacturer's technicians can only force the number to be set in the commissioning software of the DC control and protection device, or modify the software logic to simulate the protection action and test The correctness of the outlet circuit, but it is impossible to carry out the whole set of test experiments of independent devices and subsystems like AC power grid protection equipment

This test method mainly has the following problems: (1) There is a great security risk in the forced setting of numbers in the software, and the equipment operation software is modified, and the control is difficult; (2) The debugging is complicated and does not meet the on-site debugging process of the protection professional , and rely too much on equipment manufacturers, debugging and operation and maintenance units cannot intervene; (3) After the DC protection is standardized in the later period, it will not be allowed to set data in the debugging software; (4) The protection program of the DC project in operation is often upgraded on site, and the software After the upgrade, it is difficult to verify whether the software modification is correct on site, and there are potential safety hazards

[0005] Therefore, it is necessary to study a set of test methods specifically for UHV DC protection devices, to solve the problem that the current DC protection subsystem cannot be independently and effectively tested, and to improve the safety and reliability of the DC transmission system

Images