Current transformer current-limiting protection system control device and current-limiting control method thereof

Abstract

The invention discloses a control device of a current-limiting protection system for a current transformer, and the current-limiting control method thereof. The control device provided by the invention comprises a PWM (pulse-width modulation) inverter, a correction reactor, an inversion output transformer, an output filter, an AC signal sampling circuit, a DC signal sampling circuit and a processor. Compared with other operation protecting products for a current transformer, the device provided by the invention has the advantages that effective current-limiting protection can be achieved during the running process of the current transformer, the respond is fast, and high-current impact during the running process in case of instant and long-time short circuits and the like can be resisted; the method provided by the invention has high reliability, that the current transformer can maintain limited current output during failure period can be effectively ensured, the current transformer can be effectively protected, and meanwhile, better voltage current waveform output can be obtained, and the power supply sustainability can be maintained.

Description

technical field [0001] The invention relates to a short-circuit or high-current impact protection system applied to high-power converters in operation, in particular to a converter current-limiting protection system control device and a current-limiting control method thereof. Background technique [0002] The demand for converter capacity of shore power station is constantly increasing, and the requirements for its performance and reliability are getting higher and higher. The converter is the core component of the electronic shore power station, and the shore power device has converter protection and anti-interference designs against various accidents or harsh environments. Ship electrical loads include both high-power nonlinear loads of motors and sensitive loads of high-precision electronics, communication and control. Therefore, electronic shore power stations have higher requirements for converter protection performance. In practical applications, the converter is req...

AI Technical Summary

Problems solved by technology

These technologies should mainly be used in the protection modules of single converters or low-power converters, which have poor impact resistance and are prone to slow response and large circulating currents between converters due to differences in recovery time.

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