Modular multi-level structure impulse voltage generating device and method thereof

Abstract

The invention belongs to the power and electronics technical field and relates to a modular multi-level structure impulse voltage generating device and a method thereof. The device comprises a direct-current power source, a modular multi-level converter and a tested object; the modular multi-level converter is connected with the direct-current power source; and the tested object is connected onto the modular multi-level converter. The impulse voltage generating method includes the following steps of: step 1, charging: before impulse voltage is generated, sub-module capacitors are charged when the tested object is electrically connected with the modular multi-level converter; and step 2, impulse voltage generation: the modulation signals of upper half bridge arms and lower half bridge arms are compared with step waves, so that the control signals of each sub-module can be obtained, and so that required impact voltages can be generated under control. According to the device, full-controlled switching devices are adopted, a modular structure is adopted, and therefore, the device has excellent control performance in an impact voltage generating process and can generate impact voltages of arbitrary waveforms.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a modular multilevel structure impulse voltage generating device and a method thereof. Background technique [0002] Experimental techniques are extremely important to the natural sciences. Phenomena such as lightning and operating overvoltage have a great impact on the operation of the power grid. In order to maintain the safe operation of the power grid, each equipment in the power grid should be able to withstand the corresponding disturbance under the impulse voltage. However, some mechanisms of dielectric breakdown are not very clear at present. In order to study the physical phenomena of various media and devices under impulse voltage, it is often necessary to rely on experiments to solve them. At this time, the impulse voltage generator becomes particularly important. . [0003] The impulse voltage generator is a high-voltage generating device that...

AI Technical Summary

Problems solved by technology

The structure of the traditional impulse voltage generator is to boost the voltage through the AC transformer, charge the capacitor in parallel, and the ball gap triggers the capacitor to discharge in series, and obtain the values ​​of the wave front resistance and wave tail resistance through calculation, and then control the waveform and controllability poor

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