Low-voltage ride-through power supply of frequency converter

A technology of low-voltage ride-through and frequency converter, which is applied in the direction of electrical components, conversion equipment for intermediate conversion to DC, output power conversion devices, etc., and can solve accidents, insufficient output power of frequency converters, and under-voltage shutdown protection problems, to achieve fast response, ensure long-term reliable work, and avoid out-of-control states

Inactive Publication Date: 2017-10-13
SHANGHAI DIANJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The invention provides a low-voltage ride-through power supply for a frequency converter, which solves the serious shortage of the output power of the frequency converter when

Method used

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  • Low-voltage ride-through power supply of frequency converter
  • Low-voltage ride-through power supply of frequency converter
  • Low-voltage ride-through power supply of frequency converter

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Embodiment Construction

[0055] Circuit topology design of the present invention, as attached figure 1 shown. According to specific functions, the system can be divided into power part and control part. The power part is composed of a main switch circuit, a rectifier circuit, a pre-charging circuit, a boost chopper circuit, a switching circuit, and a bypass circuit; the control part is mainly composed of a sampling circuit, a controller, a drive circuit and a power supply for the control part. When QF is powered on, the DC capacitor should be charged through the pre-charging resistor YR1, and the pre-charging resistor should be bypassed after the power-on is completed. Full bridge uncontrolled rectification is adopted, and the DC power is sent to the boost circuit through the filter capacitor. The boost circuit is composed of three groups of BOOST circuits with the same parameters connected in parallel. The switching tubes of the three groups of circuits adopt an interleaved parallel modulation meth...

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PUM

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Abstract

The invention discloses a low-voltage ride-through power supply of a frequency converter. The low-voltage rid-through power supply comprises a power circuit and a control circuit, wherein the power circuit consists of a main switch circuit, a rectifying circuit, a pre-charging circuit, a boosting chopper circuit, a switching circuit and a bypass circuit; the control circuit consists of a sampling circuit, a controller, a drive circuit and a control circuit power supply; a direct current capacitor is charged through a pre-charging resistor YR1 when a breaker QF is switched on for electrification, and the pre-charging resistor YR1 is bypassed after the electrification is finished; through full bridge uncontrolled rectification, the filter capacitor is used for feeding direct current into a boosting circuit, the boosting circuit is formed by connecting three BOOST circuits with same parameters in parallel; switching tubes of the three circuits are in standby states in the low-voltage ride-through power supply in an interleaving modulation mode, the isolation of the low-voltage ride-through power supply is realized through a thyristor switch, and switching control is realized according to a designed control strategy.

Description

technical field [0001] The invention belongs to the technical field of power grid control, and in particular relates to a low-voltage ride-through power supply for a frequency converter. Background technique [0002] The frequency converter adjusts the output voltage by changing the frequency of the power supply, and has good speed regulation and energy-saving performance. Cooperating with overvoltage, overcurrent, overload and other protections, it can be applied in many fields of industrial production. Technologies used by existing frequency converters include: [0003] (1) Use the fuzzy adaptive algorithm to calculate the IGBT trigger pulse width so that the output voltage maintains the preset value, [0004] (2) Collect the three-phase AC input voltage of the low-voltage ride-through power supply, and compare the positive sequence component obtained after coordinate transformation with the starting criterion, [0005] (3) Design and collect DC voltage as a criterion, ...

Claims

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Application Information

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IPC IPC(8): H02M5/40
CPCH02M5/40H02M1/0067
Inventor 冯统庆焦斌王子豪朱思文
Owner SHANGHAI DIANJI UNIV
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