Unlock instant, AI-driven research and patent intelligence for your innovation.

Independent-feeding cascaded high-voltage frequency converter and feeding method thereof

A technology of high-voltage frequency converters and frequency converters, applied in the field of high-voltage feed units, high-voltage frequency converters and their power feeds, can solve problems such as high cost and complex control circuits, and achieve low-cost effects

Active Publication Date: 2015-01-21
TAIYUAN UNIV OF TECH +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the existing cascaded high-voltage frequency converter to realize power feeding, it is necessary to change all the rectification units into reversible active rectification units, which has the problems of high cost and complicated control circuit; the present invention provides a , a cascaded high-voltage inverter with convenient independent power feeding and its feeding method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Independent-feeding cascaded high-voltage frequency converter and feeding method thereof
  • Independent-feeding cascaded high-voltage frequency converter and feeding method thereof
  • Independent-feeding cascaded high-voltage frequency converter and feeding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] as attached figure 1 As shown, a cascaded high-voltage frequency converter for independent feeding according to the present invention includes a phase-shifting transformer 1, a cascaded high-voltage frequency converter 2, and a high-voltage motor 3, and its structural feature is that a step-down transformer is further added 4. Low-voltage inverter 5, step-up transformer 6 and DC voltage sensor 7; the primary side of the phase-shifting transformer 1 is connected to the high-voltage AC power grid, and the secondary side of the phase-shifting transformer 1 is divided into three groups A, B and C, and each group It is composed of multiple identical low-voltage rectification and H-bridge inverter units 9 connected in series. The number of rectification and inverter units is related to the grid voltage and the withstand voltage of the power devices of the rectification and inverter units. The cascaded high-voltage inverter 2 The output terminal is connected to the input termi...

Embodiment 2

[0024] The composition and working principle of Embodiment 2 are basically the same as those of Embodiment 1, except that the secondary side of the step-up transformer 6 used is the primary side of the phase-shifting transformer 2 instead of an independent composition.

Embodiment 3

[0026] The composition and working principle of Embodiment 3 are basically the same as Embodiment 1, the difference is that the low-voltage frequency converter 5 used is not a general-purpose independent frequency converter, but consists of an independent rectifier unit 10 and a cascaded high-voltage frequency converter 2 It is composed of low-voltage rectification and H-bridge inverter unit 9 with zero phase shift, and the rectification part of these three units adopts a bidirectional active control mode, and the independent boost converter 6 is omitted at the same time.

[0027] The working principle is that when the high-voltage motor 3 is in the power generation condition, since the H-bridge inverter unit of the low-voltage rectifier with phase shift adopts passive single-phase rectification, it will be in the off state, and only the phase shift is zero. The H-bridge inverter units of the three low-voltage rectifiers use active rectification. The voltage value detected by t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an independent-feeding cascaded high-voltage frequency converter and a feeding method thereof. The frequency converter comprises a phase-shifting transformer, a cascaded high-voltage frequency converter and a high-voltage motor. The frequency converter is characterized by being additionally provided with a step-down transformer, a low-voltage frequency converter, a step-up transformer and a direct-current voltage sensor. The feeding method comprises the following steps that: when the motor is in a power generating state, the direct-current voltage sensor detects a voltage value on a direct-current bus in the low-voltage frequency converter, a computer controls the low-voltage frequency converter to be in a work state, and the feeding to a high-voltage power grid is implemented through the step-up transformer; and circuits of the low-voltage frequency converter and the step-up transformer are cut off as the voltage on the direct-current bus is low and a low-voltage inverter in the low-voltage frequency converter is in a closed state when the motor is in a power-driven work condition. The independent-feeding cascaded high-voltage frequency converter flexibly adjusts the power size and structure parameters of a feeding unit, achieves low cost and modularization, and directly feeds to the power grid.

Description

technical field [0001] The invention relates to a cascaded high-voltage frequency converter and its feeding method, specifically, a high-voltage power feeding unit independent of the cascaded main high-voltage frequency converter, and its feeding power range is less than 30% of the rated power of the main motor Feed high-voltage frequency converter and its feed method. Background technique [0002] The cascading method is currently widely used in high-voltage frequency converters, and it is also the most practical control method with little harmonic interference to the power grid. It first steps down the high-voltage AC power into multiple sets of parallel low-voltage AC power through a phase-shifting transformer, generally With a voltage of 690 volts, each set of low-voltage taps is equipped with rectification and inverter units, and the units after inversion are connected in series to form three sets of high-voltage alternating current to control the speed of the high-volt...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/44H02J3/38
CPCY02E40/10
Inventor 权仲翊权龙冯克温张红娟李斌
Owner TAIYUAN UNIV OF TECH