Protection circuit of converter power component

Abstract

The invention discloses a protection circuit of a converter power component; and each converter comprises at least one power device. According to the protection circuit of the converter power component, both ends of each power device are parallelly connected with a fault bypass circuit, a thyristor and an over-current protection circuit respectively. When the power component fails to work, the fault bypass circuit triggers the thyristor, so that the thyristor is communicated and bypasses the power component. When the power component generates an over-current phenomenon, the over-current protection circuit triggers the thyristor, so that the thyristor is communicated and protects the power component. According to the protection circuit of the converter power component, the two-way control thyristor with good flow capacity and short-circuit failure characteristic, and the short-circuit over-current protection function of the power component and the short-circuit failure function of a fault power component are integrated. The over-current protection circuit and the fault bypass circuit based on the two-way control thyristor do not need any extra power supply, so that the burden of the high-level energy taking power supply of the power component is reduced, and the protection circuit of the converter power component is more suitable for forming cascaded multi-level high-voltage converters.

Description

Technical field:

[0001] The invention relates to the field of high-voltage electric power, in particular to a protection circuit of a converter power assembly. Background technique:

[0002] Advanced power electronics technology represented by high-voltage direct current transmission (HVDC) technology, flexible alternating current transmission (FACTS) technology and custom power (Custom Power) technology has been used in new energy generation, power transmission and distribution, power quality management, locomotive traction, frequency conversion Drive and other fields have been more and more applied, making high-power power electronics technology an important foundation and means for building a strong smart grid, and will increasingly play a more powerful role. For most of the high-voltage or extra-high-voltage occasions in the power system, in order to adapt to the level of the connected AC voltage and reduce the transmission loss, it is necessary to break through the limi...

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