Parallel variable frequency power supply for high power and high voltage test

Abstract

The invention discloses a parallel variable frequency power supply for a high power and high voltage test, and belongs to the technical field of electric systems. The parallel variable frequency power supply comprises two or more parallel variable frequency power supply parts with current limiting reactors. The parallel variable frequency power supply solves the problem that a main variable frequency power supply controller decodes falsely due to the fact that the signal transmission quantity of optical fiber communication is large when two or more power supplies run in parallel; the parallel variable frequency power supply ensures that asynchronism of output voltage of the parallel variable frequency power supplies is controlled within 1 microsecond; the output synchronism of the variable frequency power supplies is improved; and circular current of output among the power supply parts is realized. In addition, as guard signals are arranged among a main variable frequency power supply and slave variable frequency power supplies, the deficiency in the prior art that when remedial operation cannot be conducted when the variable frequency power supplies fail is overcome.

Description

technical field [0001] The present invention relates to a device in the field of power system technology, specifically a dual-machine parallel connection, which can be used for on-site AC withstand voltage test of GIS below 1000kV voltage level, non-partial discharge test of main transformer below 500kV voltage level, and long-distance No partial discharge variable frequency power supply for AC withstand voltage test of cables. Background technique [0002] With the rapid development of the national economy, the voltage level of power transmission is getting higher and higher, and its capacity is getting bigger and bigger. Therefore, higher requirements are put forward for the reliability of power transmission and distribution equipment and transmission cables, and they are also communicated. The capacity and power of the variable frequency power supply used in the withstand voltage test put forward higher requirements. [0003] At present, the capacity of a single variable...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a parallel high-power variable-frequency power supply for high-voltage testing, which adopts the technology of controlling the main variable-frequency power supply and optical fiber transmission of IGBT drive signals between the master-slave variable-frequency power supply, avoiding the problems caused by two or When multiple power supplies are running in parallel, the amount of optical fiber communication transmission signal is large, which causes the problem of misdecoding of the main variable frequency power supply controller, so that the asynchrony of the output voltage of multiple parallel variable frequency power supplies is controlled within 1 μs, which improves the quality of multiple variable frequency power supplies. The synchronization of the output solves the problem of circulation between multiple power outputs. At the same time, by setting a protection signal between the master and slave variable frequency power supplies, it solves the problem that the remedial operation cannot be realized when multiple variable frequency power supplies fail in the prior art. Defects

Images