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Method for reducing common mode current in power electronic equipment

A technology of power electronics and common mode current, which is applied in the direction of irreversible AC power input conversion to DC power output, electrical components, output power conversion devices, etc., which can solve the problem of reduced converter efficiency, high converter loss, and low switching time And other issues

Active Publication Date: 2020-01-03
伟肯有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, any error in the DC voltage feedback will result in much larger common mode currents compared to a design solution with low switching times and high filter inductance
Higher common-mode currents will result in higher losses in the converter and therefore the efficiency of the active front-end converter will decrease

Method used

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  • Method for reducing common mode current in power electronic equipment
  • Method for reducing common mode current in power electronic equipment
  • Method for reducing common mode current in power electronic equipment

Examples

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Embodiment Construction

[0089] Specific examples provided in the following description should not be construed to limit the scope and / or applicability of the appended claims. The lists and sets of examples provided in the description below are not exhaustive unless expressly stated otherwise.

[0090] figure 1is a diagram showing a plurality of active front end components 1 , where four active front end components are shown, coupled in parallel between an AC grid 2 and a DC link 3 . The active front end part 1 is in the form of a converter. Each active front end component is coupled to the AC grid 2 via a filter 4 comprising a first inductance 5 and a capacitor 6 , as well as a second inductance 7 . Furthermore, each active front end component 1 can be connected to and disconnected from the AC grid 2 via a switch 8 . This will be described in further detail below.

[0091] Due to the rapid changes in voltage and current within the switching converter, the active front end component 1 is a source ...

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Abstract

The present invention relates to a method for reducing common mode current in power electronic equipment comprising two or more active front end (AFE) components (1) coupled in parallel between an ACsupply grid (2) and a DC-link (3). A duty cycle of pulse width modulation (PWM) for the AFE components (1) is determined, and an error signal is derived based on the determined duty cycle of PWM and on a common mode current of the AFE components (1). A correction voltage is derived, based on the error signal, and a DC voltage control signal is derived based on the derived correction voltage and ameasured DC voltage of the DC-link (3) and / or a DC voltage reference. The power electronic equipment is controlled in accordance with the derived DC voltage control signal. The present invention alsorelates to a method for starting active front end (AFE) components (1) of power electronic equipment comprising two or more AFE components (1) coupled in parallel between an AC supply grid (2) and a DC-link (3).

Description

technical field [0001] The present invention relates to common mode current reduction, and in particular to reduction of common mode current in power electronic devices comprising two or more active front end (AFE) components. Background technique [0002] Active front-end converters are power electronic components used in power electronic systems. [0003] Such active front-end converters utilize power semiconductors controlled by signal electronics and subsequently by filter circuits. In addition, active front-end converters allow bi-directional power exchange between the AC voltage source and the DC link. Active front-end converters can also be connected in parallel, but in order to do so, a parallel control method is required. [0004] Previously, parallel control methods for parallel active front-end converters connected to the same AC voltage source and the same DC link have been applied. The method adjusts the pulse width modulation (PWM) cycle length to minimize c...

Claims

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Application Information

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IPC IPC(8): H02M1/12H02M1/36
CPCH02M1/12H02M1/36H02M1/123H02M7/493H02M7/23H02M1/0003H02M1/0043
Inventor 安德烈亚斯·多克塔尔
Owner 伟肯有限公司
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