Three-bypass high-power rectifier power supply and control method for same

Abstract

The invention discloses a three-bypass high-power rectifier power supply and a control method for the same. The power supply comprises a rectifier circuit, a thyristor rapid bypass branch circuit, a mechanical switch bypass branch circuit and a control system, wherein the thyristor rapid bypass branch circuit and the mechanical switch bypass branch circuit are connected in parallel with the direct current side of the rectifier circuit, and are positioned at the front end of a load; and the control system is connected with the rectifier circuit, the thyristor rapid bypass branch circuit and the mechanical switch bypass branch circuit respectively. When the power supply fails or the energy of the load is required to be normally relieved, the control system cuts off the power of the power supply, and forms an energy relief loop through any rectifying arm of the rectifier circuit, the thyristor rapid bypass branch circuit and the mechanical switch bypass branch circuit. Ultra-heavy current can be provided for the rapid bypass transfer of a high-inductance load when the rectifier circuit is normally turned off or fails, so that the load is protected, simultaneously the power supply is also protected, the impact of the energy of the load on the power supply is prevented, and the power supply and the method are high in application safety and reliability.

Description

technical field [0001] The invention relates to a power supply device and a control method thereof, in particular to a rectifier circuit with three bypass functions and a control method thereof, which are applied in the field of industrial application of high-power conversion. Background technique [0002] The rectifier power supply is a device that converts alternating current into direct current by using the inherent characteristics of semiconductor devices to provide large direct current and direct voltage. In high-power conversion industrial applications and scientific research experiments, there are often inductive loads or energy storage loads with large inductance; in order to ensure the stable operation of the rectifier system and the safety of the system load, it must be corrected when the system is normally shut down or the system fails. The large amount of energy stored in the load is safely transferred and discharged. A common method is to use an energy release ...

AI Technical Summary

Problems solved by technology

Its main disadvantages are: (1) When the large inductive load is in operation, the load current is very large during normal shutdown or fault shutdown. The Crowbar bypass method circuit of the thyristor-based PSM module is one-time. When the fast fuse blows, the system Can only be operated again by replacing the device, high application cost and poor maintainability

(2) When the load current of a large inductance such as a magnet is very large, the thyristor device has a limited ability to withstand current and the working time is not long. It requires a lot of components to be connected in parallel to meet the requirements of large current release. The structure is very complicated and difficult to manufacture. Control Low reliability and high cost

This method is to bypass the large current generated during the power grid fault to the IGBT and the bypass resistor branch. In a high-power system with a particularly large current (up to tens or hundreds of kiloamperes) and a voltage of thousands of volts, Based on the current level of semiconductor devices, a single IGBT cannot meet the current and voltage level requirements of the bypass branch at the same time. If multiple IGBTs are used in series and parallel, the bypass stability of the system will be reduced, and the cost will be greatly increased.

It is also difficult to design bypass resistors in terms of power, volume, and heat dissipation

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