High-voltage inverter with UPS (uninterrupted power supply)

Abstract

The invention discloses a high-voltage inverter with a UPS (uninterrupted power supply). The high-voltage inverter with the UPS comprises a three-phase transformer, 3*(2N+1) power units, a first DSP (digital signal processor), a second DSP (digital signal processor), an optical fiber communication module, a communication interface and a control panel, wherein the 3*(2N+1) power units are equally divided into three groups; 2N+1 power units in each group are serially connected to form each phase of the high-voltage inverter; and each power unit comprises a first rectifying circuit, a second rectifying circuit, a first charging circuit, a second charging circuit, a first supercapacitor bank, a second supercapacitor bank, a first DC / DC (direct current / direct current) converting circuit, a second DC / DC converting circuit and an SPWM (sinusoidal pulse width modulation) three-level inverter circuit. The supercapacitor banks are added as energy storage mechanisms of the power units, so that the problems that the continuous operation of the conventional high-voltage inverter cannot be ensured and the conventional high-voltage inverter is shut down due to inconvenient production caused by sharp fall or short interruption of supply voltage are avoided.

Description

technical field [0001] The invention relates to a high-voltage frequency converter with UPS. Background technique [0002] High-voltage inverters are power control devices used in huge power-consuming fields such as petrochemicals, shipbuilding, heavy machinery, and electric energy. With the promotion of frequency conversion energy-saving technology and the development of high-power power electronic devices such as IGBTs, the application prospects of high-voltage inverters It is also becoming more and more widespread. The existing high-voltage inverters have the following problems: the high-voltage power supply system will cause a large drop in power supply voltage or even a short-term interruption for several seconds due to lightning strikes, short circuits, and heavy load startups. The existing high-voltage inverters are used as high-voltage power supplies. When the above-mentioned swaying power occurs in the system, continuous operation cannot be guaranteed and shutdown w...

AI Technical Summary

Problems solved by technology

[0002] High-voltage inverters are power control devices used in huge power-consuming fields such as petrochemicals, shipbuilding, heavy machinery, and electric energy. With the promotion of frequency conversion energy-saving technology and the development of high-power power electronic devices such as IGBTs, the application prospects of high-voltage inverters It is also becoming more and more widespread. The existing high-voltage inverters have the following problems: the high-voltage power supply system will cause a large drop in power supply voltage or even a short-term interruption for several seconds due to lightning strikes, short circuits, and heavy load startups. The existing high-voltage inverters are used as high-voltage power supplies. When the above-mentioned swaying power occurs in the system, continuous operation cannot be guaranteed and shutdown will occur, which will affect normal production and bring certain economic losses; since the rectification and inverter circuits of the high-voltage inverter both use the switching characteristics of power electronic devices, Waveform distortion will be generated at its input and output terminals, which will cause harmful effects of input harmonics on the grid and output harmonics on the load, so the harmonic content of the high-voltage inverter is an important parameter that determines its performance and application effect; adopt The single-chip microcomputer controls the high-voltage inverter, and the processing capacity is limited, which cannot meet the requirements of a large amount of data to be processed, real-time performance and high precision.

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