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A high-performance synchronous overmodulation algorithm for a diode-clamped three-level inverter

A three-level inverter, diode clamping technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of complex algorithm, unfavorable engineering application, poor harmonic performance of the inverter, etc., to achieve simplification Calculation process, effect of improving current harmonic performance, reducing switching frequency and switching losses

Active Publication Date: 2021-09-17
希望森兰科技股份有限公司
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Problems solved by technology

Among them, the single-mode algorithm engineering implementation is relatively simple, but the harmonic performance of the inverter output is poor
The dual-mode algorithm can improve the inverter output harmonics, but the algorithm is very complicated, which is not conducive to engineering applications

Method used

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  • A high-performance synchronous overmodulation algorithm for a diode-clamped three-level inverter
  • A high-performance synchronous overmodulation algorithm for a diode-clamped three-level inverter
  • A high-performance synchronous overmodulation algorithm for a diode-clamped three-level inverter

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Embodiment Construction

[0046] The present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment, so that those skilled in the art understand the present invention, but should be clear, the present invention is not limited to the scope of specific embodiment, to those of ordinary skill in the art In other words, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0047] The specific implementation steps are as follows.

[0048] A high-performance synchronous overmodulation algorithm for a diode-clamped three-level inverter, comprising the following steps:

[0049] Step 1: Establish a mathematical model of a diode-clamped three-level inverter. Diode-clamped three-level inverter topology such as figure 1 shown. In the d...

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Abstract

The invention discloses a high-performance synchronous overmodulation algorithm for a diode-clamped three-level inverter. The algorithm adopts a 4-segment vector synthesis method, and reduces the switching frequency of the inverter to half of the traditional 7-segment vector synthesis method. . In the overmodulation area, innovatively use the area equivalent principle to achieve volt-second balance, and calculate the basic voltage vector action time to minimize the 5th and 7th harmonic content of the output voltage according to Fourier analysis, so as to suppress low switching frequency The resulting low frequency current harmonics and torque ripple. The application solves the problems of high switching frequency and large current and torque harmonics in the traditional algorithm, and has the advantages of simple algorithm and strong applicability.

Description

technical field [0001] The invention relates to the modulation field of a diode-clamped three-level inverter in the field of power electronics and electric transmission, in particular to a high-performance diode-clamped three-level inverter with low switching frequency, torque ripple and current harmonics Synchronous overmodulation algorithm. Background technique [0002] Compared with traditional two-level inverters, diode-clamped three-level inverters have lower tube voltage drop and lower output harmonics at the same switching frequency. Therefore, diode-clamped three-level inverters have been widely used in medium-voltage and high-power motor drive applications. Currently, there are two common modulation algorithms for diode-clamped three-level inverters: space voltage vector modulation and carrier pulse width modulation. These two algorithms have been widely used and popularized in the industry because of their good harmonic performance and relatively simple algorithm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387H02M1/12H02P27/12G06F17/11
CPCG06F17/11H02M1/12H02M7/483H02M7/53875H02P27/12
Inventor 张树林宋玉明任光法张正松
Owner 希望森兰科技股份有限公司
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