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Modulation method for reducing common-mode voltage of three-phase pulse-width modulation (PWM) converter

A technology of common-mode voltage and modulation method, which is applied in the field of modulation to reduce the common-mode voltage of three-phase PWM converters, and can solve problems such as poor performance of common-mode voltage, impact on normal system operation, and personal safety hazards

Inactive Publication Date: 2013-07-10
BEIJING JIAOTONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the common-mode voltage performance of the above-mentioned modulation method is poor. Therefore, a common-mode current can be generated when an appropriate current path is provided for the common-mode voltage. influences

Method used

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  • Modulation method for reducing common-mode voltage of three-phase pulse-width modulation (PWM) converter
  • Modulation method for reducing common-mode voltage of three-phase pulse-width modulation (PWM) converter
  • Modulation method for reducing common-mode voltage of three-phase pulse-width modulation (PWM) converter

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Embodiment Construction

[0065] The present invention will be further described in conjunction with accompanying drawing

[0066] Schematic diagram of a three-phase PWM converter, such as figure 1 As shown, when the circuit is working, the upper and lower controllable switch tubes are complementarily turned on, and the three-phase voltage u on the AC side of the three-phase PWM converter AN , u BN , u CN space voltage vector

[0067] V ref = 2 3 ( u AN + α u BN + α 2 u CN )

[0068] express. Among them, α=e j2π / 3 , α 2 =e j4π / 3 , j is the imaginary unit.

[0069] At this time, use figure 2 The basic space vectors shown can be synthesized into the space vector V ref ...

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Abstract

The invention belongs to the field of power electronics, and particularly relates to a modulation method for reducing common-mode voltage of a three-phase pulse-width modulation (PWM) converter. The modulation method is characterized in that three nonadjacent nonzero basic space vectors are used for synthesizing a target vector, and is further characterized in that two comparison value counting modules are adopted to generate control pulse, and the counting modules are different in counting mode. Counting modes of the comparison value counting modules used for generation of out-phase bridge arm control pulse in the same sector of voltage commands are different, and in the different sectors, the counting modes of the comparison value counting modules used by the same-phrase bridge arm are also different. The modulation method has a good common-mode voltage restraining effect, the common-mode voltage maximum peak is one-sixth of direct current bus voltage, and therefore common-mode currents can be effectively reduced when the modulation method is applied to fields of photovoltaic power stations, motor drive and charging stations.

Description

technical field [0001] The invention belongs to the field of power electronics, in particular to a modulation method for reducing the common-mode voltage of a three-phase PWM converter. Background technique [0002] The three-phase voltage source PWM converter is widely used in the fields of three-phase motor drive, photovoltaic power station and electric vehicle charging station because of its high voltage utilization rate, low harmonic current and bidirectional current conversion capability. Wide range of applications. The traditional continuous PWM (CPWM) method and discrete PWM (DPWM) method both have good voltage linearity, AC and DC side current ripple performance, so these control methods are widely used. However, the common-mode voltage performance of the above-mentioned modulation method is poor. Therefore, a common-mode current can be generated when an appropriate current path is provided for the common-mode voltage. influences. Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797
CPCY02E10/56
Inventor 姜久春周新宇张维戈
Owner BEIJING JIAOTONG UNIV
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