Method for detecting small disturbance analysis line selection apparatus based on RTDS

Abstract

The invention belongs to the technical field of line selection function testing for power systems, specifically to a method for detecting a small disturbance analysis line selection apparatus based on RTDS. A simulation model is built according to on-site real parameters of a transformer substation, and different faults are built in the simulation model to allow the simulation model to output corresponding current signals and voltage signals according to different grounding faults. A RTDS signaling channel outputs fault voltage and current in accordance with on-site reality to a power amplifier for amplification, the small disturbance analysis line selection apparatus upon reception of amplification signals feeds back to the simulation model for adjusting compensating ratio through the RTDS signaling channel, and the small disturbance analysis line selection apparatus realizes fault line selection according to signal variance. The method detects small disturbance analysis line selection apparatus in a power distribution network, and accurately determines the line selection capability of the line selection apparatus.

Description

technical field [0001] The invention belongs to the technical field of line selection function testing of electric power systems, and mainly relates to a test scheme for a single-phase ground fault line selection device of a small current grounding system, in particular to a detection method for a line selection device based on an RTDS small disturbance method. Background technique [0002] Indirect grounding system is commonly used in medium and low voltage distribution networks in my country. Its main advantage is that only a small zero-sequence current will be generated in the system when a single-phase ground fault occurs, and the three-phase line voltage can still maintain symmetry. Affect the normal operation of the system, and can continue to run for 1-2h under single-phase ground fault. However, when the distribution network system continues to operate under a single-phase ground fault, the single-phase ground phase voltage drops to zero, while the non-fault phase vol...

AI Technical Summary

Problems solved by technology

However, when the distribution network system continues to operate under a single-phase ground fault, the single-phase ground phase voltage drops to zero, while the non-fault phase voltage rises to three times the square root of normal operation, and long-term operation under fault conditions leads to The rising voltage will break down the weak part of the non-faulty phase insulation, resulting in a two-phase grounding short circuit fault or a three-phase short circuit. The reliability of the power grid operation; however, the current small current grounding line selection device cannot accurately select the fault line due to reasons such as the fault current is not obvious, and there has been no reasonable detection method to detect the line selection device due to technical reasons , and determine its line selection ability, it is more difficult to detect its line selection ability for small disturbance method fault line selection devices that require closed-loop feedback. The grounding line selection device is used for testing, and the test scheme is designed on a recognized platform, which makes it have a certain degree of recognition in the industry

Images