A pulse width modulation method and device based on an equivalent zero vector

A pulse width modulation, zero vector technology, applied in the output power conversion device, electrical components, AC power input into DC power output and other directions, can solve the problem of large amount of calculation, to improve efficiency, reduce common mode voltage, The effect of saving computation

Inactive Publication Date: 2018-12-18
ZHANGJIAKOU WIND & SOLAR POWER ENERGY DEMONSTRATION STATION CO LTD +2
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Problems solved by technology

[0012] The purpose of the present invention is to provide a pulse width modulation method and device based on an equivalent zer

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  • A pulse width modulation method and device based on an equivalent zero vector
  • A pulse width modulation method and device based on an equivalent zero vector
  • A pulse width modulation method and device based on an equivalent zero vector

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Embodiment Construction

[0043] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0044] Based on the original space vector pulse width modulation (SVPWM) modulation algorithm, the present invention retains the space vector action time calculation part of the modulated wave, modifies the carrier comparison pulse generation part, and uses a certain rule to replace the original zero vector (000 and 111), on the basis of ensuring the voltage output of the three-phase converter, the effect of reducing the common-mode voltage of the converter port is achieved. The implementation steps are as follows Figure 7 shown.

[0045] The pulse width modulation method of the three-phase voltage type two-level inverter bridge is used as an example to illustrate, as follows: figure 1 As shown, the three-phase voltage type inverter bridge targeted by the present invention is composed of six power switch tubes, and the six switch tubes are re...

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Abstract

The invention relates to a pulse width modulation method and device based on an equivalent zero vector, belonging to the technical field of power electronic converters. The invention determines the action time of the modulated wave space vector according to a space vector algorithm, adopts the adjacent symmetrical vector with equal time to replace the zero vector in the modulated wave space vector, and ensures the voltage output of the three-phase converter to achieve the effect of reducing the common-mode voltage of the converter port on the basis of the voltage output of the three-phase converter. The invention completely retains the existing space vector calculation part, obtains the carrier signal by calculating the voltage instruction through the space vector algorithm, and greatly saves the calculation amount and improves the efficiency compared with an existing vector modulation method for reducing the common-mode voltage.

Description

technical field [0001] The invention relates to a pulse width modulation method and device based on an equivalent zero vector, and belongs to the technical field of power electronic converters. Background technique [0002] With the rapid development of industry and new energy power generation technology, two-level three-phase converters based on voltage sources are widely used, such as photovoltaic inverters, energy storage converters, wind power converters, and active filters. , drive frequency converter and so on. In any voltage source converter, due to the action of its switching tubes, common-mode voltages exist. It should be noted that although there is no common-mode component in the differential-mode voltage output by the converter, the common-mode current generated by the common-mode voltage will still flow through the load. The magnitude of this current depends on the common mode impedance of the system, circuit structure and grounding device, and consumes input ...

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Application Information

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IPC IPC(8): H02M7/5387
CPCH02M7/53875H02M7/53876
Inventor 刘汉民才鸿飞郑宇清苏长江王铮许恩泽李继凯刘海舰李长喜翟耀辉
Owner ZHANGJIAKOU WIND & SOLAR POWER ENERGY DEMONSTRATION STATION CO LTD
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