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,

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