Novel direct-current converter valve thyristor damping loop

Abstract

The invention discloses a design of a novel direct-current converter valve thyristor damping loop, which can meet all requirements on electrical designs. The damping loop consists of a direct-current voltage-equalizing resistor, a damping resistor and a damping capacitor, wherein the direct-current voltage-equalizing resistor plays a role in equalizing the voltage of a converter valve and provides a loop for voltage detection of a circuit board. The damping capacitor consists of three capacitors, wherein one damping capacitor plays a role in dividing a voltage; one damping capacitor and the damping resistor are connected in series to form a damping loop; and another damping capacitor is connected in series with a quick energy-taking loop resistor to form a quick energy-taking loop of a thyristor testing and monitoring (TTM) unit. By the novel design method, the design of the direct-current converter valve thyristor damping loop is simplified as possible in the situation of meeting requirements.

Description

technical field [0001] The invention relates to the field of power electronic devices, in particular to a novel thyristor damping circuit of a DC converter valve. Background technique [0002] The thyristor damping circuit is an important part of the thyristor-level circuit. Most of the modern design ideas are composed of RC circuits to form the damping circuit. The damping circuit designed by this invention is shown in the appendix figure 1 shown. During the normal operation of the converter valve, since the converter valve is composed of multiple thyristors in series, the thyristors of each stage should bear a similar voltage, and the damping circuit plays the role of internal dynamic pressure equalization. In addition, The damping circuit provides an energy harvesting circuit for the thyristor trigger and monitoring unit TTM. TTM is a thyristor-level triggering, monitoring and protection device. The voltage and current reach the required value, so it can ensure its norm...

AI Technical Summary

Problems solved by technology

The damping loop is composed of two loops. This design method can ensure that the two damping loops are used to obtain energy, so that the electric energy of the gate plate can be maintained for a long time, but this design method makes the damping loop slightly complicated. The design of this circuit increases the probability of problems in actual engineering, and such a damping circuit design does not have a fast energy harvesting circuit, which cannot satisfy the gate plate to establish a working voltage in a short period of time

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