Thyristor dv/dt protection method

Abstract

The invention relates to the field of devices of power systems, in particular to a novel thyristor dv / dt protection method. The invention provides a dv / dt protection strategy by designing a direct current converter valve thyristor level dv / dt protection circuit. The novel thyristor dv / dt protection method can detect thyristor level dv / dt, adjust the protection level of a thyristor by detecting dv / dt and further achieve the purpose of protecting the thyristor. The protection circuit has simple structure and ingenious design method, and can better protect the thyristor from being damaged by over-high dv / dt.

Description

technical field [0001] The invention relates to the field of power system devices, in particular to a novel thyristor dv / dt protection method. Background technique [0002] The converter valve is the most important primary equipment of the DC transmission project. During the operation of the converter valve, it may be affected by steep waves, lightning waves, and operating waves. In order to quickly trigger the conduction of the thyristor and prevent the thyristor from being damaged, the design During the process, the voltage applied to the valve is judged by measuring the dv / dt value. When it is judged that the dv / dt reaches the protection level value, the thyristor is triggered to achieve the purpose of protecting the thyristor. [0003] The converter valve may be affected by steep waves, lightning waves, and operating waves during operation. Due to the rapid rate of voltage rise, a large voltage change rate (dv / dt) is generated on the converter valve. dv / dt may be fatal ...

AI Technical Summary

Problems solved by technology

[0003] The converter valve may be affected by steep waves, lightning waves, and operating waves during operation. Due to the rapid rise in voltage, a large voltage change rate (dv / dt) is generated on the converter valve. dv / dt may be fatal to the thyristor, and it can cause damage to the thyristor, so the dv / dt protection circuit must be considered when designing the thyristor electronic equipment, so as to achieve the purpose of protecting the thyristor

[0004] Because the traditional DC transmission project is to purchase foreign DC transmission converter valves, this technology is still monopolized by foreign companies, because the realization method and protection strategy of the dv / dt protection of the thyristor of the converter valve are relatively difficult, and with the junction temperature of the thyristor As the voltage increases, the voltage tolerance of the thyristor will decrease, and the dv / dt protection level of the thyristor will also decrease accordingly. Therefore, the dv / dt protection strategy of the thyristor is relatively complicated. / dt protection circuit and protection strategy have relatively professional theoretical analysis

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