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Pulse width modulation (PWM) rectifier using transformer leakage inductance as LCL filtering

A filter rectifier and transformer technology, applied in the field of PWM rectifier system, can solve the problems of high-order harmonic current entry and interference, and achieve the effects of reducing high-frequency content, reducing power consumption, and saving costs

Inactive Publication Date: 2016-01-13
GUANGDONG ANHEWEI ELECTRIC POWER CONSTR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, grid-connected inverters generally use high-frequency PWM modulation, resulting in a large amount of high-order harmonic current entering the grid, which will interfere with other EMI (Electron-Magnetic Interference) sensitive equipment in the grid

Method used

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  • Pulse width modulation (PWM) rectifier using transformer leakage inductance as LCL filtering
  • Pulse width modulation (PWM) rectifier using transformer leakage inductance as LCL filtering
  • Pulse width modulation (PWM) rectifier using transformer leakage inductance as LCL filtering

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Embodiment Construction

[0021] see figure 1 , figure 2 with image 3 As shown, the size of the volume of the present invention is mainly determined by the magnetic core of the filter inductor. When selecting inductance parameters and magnetic cores, it is necessary to weigh many aspects. Using the resonant frequency as the intermediate parameter, calculate the attenuation ratio of the current harmonic as the quadratic equation of the variable. By solving the equation, other parameters of the filter can be easily obtained.

[0022] The structure principle of LCL filter rectifier is as follows: figure 1 , figure 2 It shows the phase-voltage vector relationship of the three-phase voltage-type rectifier. Among them, U, E, and I are the effective values ​​of the phase voltage fundamental wave, the phase grid voltage fundamental wave, and the phase current fundamental wave of the AC side of the LCL filter rectifier, respectively. u L is the voltage across the inductor. Assuming that the system po...

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Abstract

The invention relates to a pulse width modulation (PWM) rectifier using transformer leakage inductance as LCL filtering. The PWM rectifier comprises a transformer and an LCL filtering rectifier, wherein the LCL filtering rectifier comprises an LCL filter and a PWM rectifier, the transformer is accessed from a 10kV power grid and outputs AC 400V after transformation, higher harmonic is filtered out by using the LCL filter, the AC 400V is supplied to a DC charger after passing through the PWM rectifier for a battery to charge, the LCL filtering rectifier comprises an energy storage inductor L2 and a filtering capacitor C, the leakage inductance of the transformer is used as a filter inductor L1 by the LCL filtering rectifier, and the conventional PWM rectifier adopts LCLs to form a filtering and energy storage circuit. Since the total inductance value required by the LCL filtering rectifier is smaller than that of the LCL filter, the PWM rectifier is more applicable for a current control type grid-connected device with high power and low switching frequency.

Description

technical field [0001] The invention belongs to the field of new energy vehicles, and in particular relates to a PWM rectifier system using transformer leakage inductance as an LCL filter. Background technique [0002] The electric vehicle battery replacement mode is also called the ground charging system, that is, the battery pack quick replacement system, also called mechanical charging. The purpose of charging the electric vehicle is achieved by directly replacing the battery pack of the electric vehicle. Due to the heavy weight of the battery pack, the professional requirements for battery replacement are strong, and professionals are required to use professional machinery to quickly complete battery replacement, charging and maintenance. Using the battery replacement charging mode, electric vehicle users can rent fully charged batteries and replace exhausted batteries, which is conducive to improving the efficiency of the vehicle, and also improves the convenience and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02J7/02
Inventor 张文武窦明武
Owner GUANGDONG ANHEWEI ELECTRIC POWER CONSTR CO LTD
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