Thyristor fast switching and protection control circuit and control method thereof

Abstract

The invention provides a thyristor fast switching and protection control circuit and a control method thereof. The circuit comprises an SF6 circuit breaker and a primary side coupling coil L1. A dotted end side of the coupling coil L1 is connected to the SF6 circuit breaker, and an undotted end of the coupling coil L1 is connected to a thyristor switching module. An undotted end of a coupling coilL2 is connected to a dotted end of a coupling coil L3, a common end of the coupling coils L2 and L3 is connected to a positive electrode of a diode D1, and an undotted end of the coupling coil L3 isconnected to a positive electrode of a diode D2. One end of a charging and discharging capacitor C2 is connected to a dotted end of the coupling coil L2, one end of a charging and discharging capacitor C2 is connected to negative electrode of the diode D2, and a common end of the charging and discharging capacitors C1 and C2 is connected to a negative electrode of the diode D1 and one end of a load reactor XL. The SF6 circuit breaker, a sensor unit and the thyristor switching module are all connected to a control unit. According to the thyristor fast switching and protection control circuit and the control method, the rapid switching of a thyristor can be promoted, the synergistic protection between switches can be achieved by a coordinated control method of a main circuit composite switch, and the damage caused by a switch failure is reduced.

Description

technical field [0001] The invention relates to a thyristor fast switch and protection control circuit and a control method thereof, and relates to the technical field of switch circuit control. Background technique [0002] With the rapid development of the national economy, the demand for energy is increasing day by day, and the problem of energy shortage is becoming more and more prominent. The development and utilization of renewable resources, such as wind energy and solar energy, is an inevitable choice to alleviate energy problems. Distributed power supply is the same reliable utilization method of new energy. Due to the characteristics of distributed power supply, such as green and pollution-free, flexible installation, high energy utilization rate, and ability to effectively reduce transmission loss, a large number of distributed power supplies are connected to the power grid. However, distributed power also has problems such as difficult control and instability. At...

AI Technical Summary

Problems solved by technology

Distributed power supply and instantaneous reactive power compensation require fast and off-grid requirements, but the commonly used static switch (STS), low-voltage DC system fast switch, thyristor switching switch, etc. cannot meet the fast switching requirements, and the action switch cannot be used in case of failure. Effective protection will cause greater damage to the switch

[0004] Traditional fast switches mostly use mechanical contact structures, which are difficult to meet the requirements of distributed power generation and off-grid switching and fast switching of power compensation units

In addition, the thyristor switching circuit with fast switching speed has a long switching time for switching on and off, which cannot meet the needs of fast switching, and the frequent and fast switching of thyristors will increase the failure rate, and the cost of semiconductor switches is high. If the switch fails , will result in large economic losses

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