Undercurrent line selection test system and method based on PSCAD closed loop technology

Abstract

The invention discloses an undercurrent line selection test system based on PSCAD closed loop technology, which comprises a typical transformer station model built by taking a PSCAD simulation software as the platform, a simulation control module for a lot of fault models and an active undercurrent grounding line selection apparatus effect model, a data processing module, a signal transmission module, a signal amplification module, a test feedback module and a result analysis module, wherein the test system has the advantages of high simulation result fitting degree, wide popularization and simple operation, and according to the test system, a lot of automatic simulation tests can be done; and the test result can be analyzed and evaluated based on real need.

Description

technical field [0001] The invention relates to a system and method for closed-loop testing of a small-current grounding line selection device, in particular to a small-current line selection testing system and method based on PSCAD (electromagnetic transient simulation software) closed-loop technology. Background technique [0002] my country's medium and low voltage distribution network generally adopts the neutral point indirect grounding method. 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. It will not affect the normal operation of the system, and it can continue to run for 1 to 2 hours under single-phase ground fault. However, when the distribution system continues to operate under a single-phase-to-ground fault, the single-phase-to-ground phase voltage drops to zero, while the non-faulted phase voltage rises to the norma...

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Problems solved by technology

At present, there is no special national standard or industry standard for small current grounding line selection devices. Power supply companies often have no evidence to rely on when selecting line selection devices. It often occurs that the products cannot fully function or even be idle after purchase.

[0004] At present, in the case of a small number of faults, the test of the small current grounding line selection device is manually carried out by the tester on the RTDS (real-time digital simulator), but the program has the following defects: 1. RTDS is expensive, and only A small number of electric power research institutes have the ability to purchase, and the device to be tested must be carried to the RTDS laboratory for testing. Therefore, it is difficult to popularize the small current grounding line selection device test system based on the RTDS platform; 2. At present, the research level of RTDS in China is limited. Realize manual testing of a small number of fault conditions, and the operation process of testers is complicated; 3. RTDS has the inherent defect of real-time simulation device, that is, the simulation capacity is limited, which leads to the inconsistency between its simulation waveform and the waveform generated by the actual fault of the power system distribution network. high

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