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Protecting method for sudden drop of electric and electronic equipment with medium or high electric power

A technology of power electronics and power failure protection, which is applied in the direction of emergency protection circuit devices, electrical components, output power conversion devices, etc., can solve problems such as power grid power failure, and achieve the effects of reliable operation, low cost and small size

Inactive Publication Date: 2008-10-22
SUZHOU IND PARK HESHUN ELECTRIC CO LTD +3
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AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the shortcomings of the power-off protection measures for the power grid of the medium and high-voltage power electronic equipment of the existing voltage-type inverters, and proposes a protection method for sudden power-off. Problems Existing in Power Loss Protection of Power Network

Method used

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  • Protecting method for sudden drop of electric and electronic equipment with medium or high electric power
  • Protecting method for sudden drop of electric and electronic equipment with medium or high electric power
  • Protecting method for sudden drop of electric and electronic equipment with medium or high electric power

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Embodiment

[0024] Embodiment: A sudden power failure protection method for medium and high voltage power electronic equipment

[0025] As shown in Figure 3, for medium and high voltage power electronic equipment such as voltage-type inverters, the DC power supply between the DC side of the inverter (that is, the output Udc of the main circuit in Figure 3) and the control circuit and drive circuit in the inverter A single-ended flyback voltage feedback circuit is added between the terminals (that is, the power supply circuit in Figure 3), and the single-ended flyback voltage feedback circuit is a DC / DC conversion circuit, so as to use the first capacitor ( refer to figure 1 In the capacitor), when the power grid suddenly loses power, the power on the DC side is fed back to the DC power supply end of the control circuit and the drive circuit. At the same time, a power-down protection judging circuit is added between the AC side of the inverter and the drive circuit of the inverter, and a ...

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Abstract

The invention provides a method for protecting a medium and high voltage electronic equipment from a sudden power failure, which belongs to the power and electronics equipment power failure protection technology field and is characterized in that energy on a DC side is converted onto a control circuit and a driving circuit by adopting energy feedback concept, which not only realizes the full utilization of energy, but also realizes the function of protecting power grid from failure. Compared with the protective measures by UPS or batteries, the method has the advantage of reliable work, small device volume, long service life and low cost, etc. The protecting method is used in a shunt active power filter, and the effectiveness is verified.

Description

technical field [0001] The invention relates to the technical field of power-down protection of power electronic equipment, in particular to a method for sudden power-down protection of medium and high voltage power electronic equipment. Background technique [0002] Power electronic equipment mainly includes rectifiers and inverters. The inverter can be divided into voltage type and current type according to its power source type, and its topology is as follows: figure 1 with figure 2 As shown, the intermediate DC link of the current source inverter generally uses a large inductor as the energy storage link, and the energy storage element of the intermediate DC link of the voltage source inverter generally uses a large capacitor. Since the working principle of the inverter is to realize the purpose of converting direct current to alternating current by controlling the turn-on time of the switching device, the control circuit and the driving circuit are essential. For th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02H7/12H02H7/122
Inventor 杨耕张光新汤玉明
Owner SUZHOU IND PARK HESHUN ELECTRIC CO LTD
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