A five-level high-voltage frequency converter

Abstract

The invention relates to the technical filed of the multi-power-level high-voltage transducer, in particular to a five power-level transducer and the control method thereof. The five power-level of the invention is formed by connecting a high-voltage rectifier circuit, a high-voltage capacitor filter circuit, a voltage balancing circuit, and an inverting circuit in turn. The invention is characterized in that the inverting circuit adopts one or two apparatus / apparatuses in the IGBT and the IGCT to form an inverter, adopts a diode clamping five-power-level structure and three inverters with uniform bridge arms. The invention can provide higher resolution and can obtain better harmonic characteristic for the low-voltage area of a signal, better output characteristic and high-voltage high-power output for the high-voltage area of the signal; in addition, the invention has the advantages of easy control, and being safe and reliable.

Description

(1) Technical field [0001] The invention relates to the technical field of multi-level high-voltage frequency converters, in particular to a five-level high-voltage frequency converter based on hybrid components, and a control method thereof. (2) Background technology [0002] With the development of modern power electronic devices, their voltage levels continue to increase, but there are still many defects in using high-voltage power devices directly as high-voltage inverters: 1. The higher the withstand voltage level of the device, the higher the du / dt Large, which is not good for the insulation of the motor; 2. The device is limited by the voltage-resistant material, and it is impossible to increase it without limit. At present, high-voltage inverters generally use the method of adding a phase-shifting transformer at the input end to solve the problem of insufficient withstand voltage of the device. However, due to the phase-shifting transformer at the input end, the loss...

AI Technical Summary

Problems solved by technology

[0002] With the development of modern power electronic devices, their voltage levels continue to increase, but there are still many defects in using high-voltage power devices directly as high-voltage inverters: 1. The higher the withstand voltage level of the device, the higher the du / dt Large, which is not good for the insulation of the motor; 2. The device is limited by the voltage-resistant material, and it is impossible to increase without limit

At present, high-voltage inverters generally use the method of adding a phase-shifting transformer at the input end to solve the problem of insufficient withstand voltage of the device. However, due to the phase-shifting transformer at the input end, the loss of the whole machine is high and the volume is large, which is not conducive to the miniaturization and low-cost of the product. Development in the direction of cost and high efficiency

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