Power unit testing circuit for IGCT (integrated gate commutated thyristor) three-level medium voltage frequency converter

Abstract

The invention relates to a power unit testing circuit for an IGCT (integrated gate commutated thyristor) three-level medium voltage frequency converter. The frequency converter is technically characterized in that an input switch Q1 is connected with a voltage regulator T1 and then is respectively connected with a transformer T11 and a transformer T12 by virtue of a branch switch Q11 and a branch switch Q12, the transformer T11 and the transformer T12 are respectively connected with a rectifier A and a rectifier B, the rectifier A and the rectifier B are respectively connected with a filter capacitor CA and a filter capacitor CB in parallel, a discharge circuit is respectively connected with the two ends of the filter capacitor CA and the filter capacitor CB in parallel, the discharge circuits are connected with a grounded circuit, the two filter capacitors are connected with a tested power unit by virtue of a di / dt buffer circuit, the tested power unit is connected with a test load, and a controller for test is connected with the discharge circuits and the tested power unit. By adopting the power unit testing circuit provided by the invention, a temperature rise test of the tested power unit and an on-off test of a single-IGCT device and a bridge arm are realized, and the power unit testing circuit provided by the invention has the characteristics of simple test circuit, low total capacity, low energy consumption, no pollution to a power grid, convenience in operation and the like.

Description

technical field [0001] The invention belongs to the field of medium-voltage frequency converters, in particular to a power unit test circuit for IGCT three-level medium-voltage frequency converters. Background technique [0002] IGCT (Integrated Gate Commutated Thyristor) is a high-power semiconductor switching device used in power conversion. It has the characteristics of large on-state current, low on-state on-state voltage, and fast turn-off. The main power switching device of the flat medium voltage frequency converter. In order to deeply understand the characteristics of IGCT devices, use IGCTs safely and efficiently, improve their application design capabilities, develop high-performance inverters, and conduct factory equipment testing, etc., it is necessary to test the power unit for IGCT three-level medium-voltage inverters. less work. [0003] In the design of high-power medium-voltage inverters, for the convenience of equipment manufacturing, use and maintenance,...

AI Technical Summary

Problems solved by technology

At present, because the rated output test of high-power inverter equipment is limited by the capacity of the test equipment, site, power supply capacity, etc., it is difficult to perform a stable rated power test

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