Novel PWM inverter topology structure

A topology and inverter technology, applied in the field of new PWM inverter topology, can solve the problems of increasing the difficulty of system design, increasing the quality of inverters, etc., and achieve the effect of eliminating harmonic components and suppressing common mode voltage

Inactive Publication Date: 2018-03-09
申茂军
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Problems solved by technology

This kind of method is to reduce the common mode voltage by adding hardware, but this increase

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  • Novel PWM inverter topology structure

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Embodiment Construction

[0013] As shown in the figure, the novel PWM inverter topology of the present invention includes a pulse width modulation strategy, an LC filter, a power switching device, and a motor (M).

[0014] The main idea of ​​the pulse width modulation strategy is to use the ideal flux circle of the stator of the three-phase symmetrical motor as a reference standard when the three-phase symmetrical sine wave voltage is supplied, and to perform appropriate switching with different switching modes of the three-phase inverter, thereby forming a PWM wave , use the formed actual flux vector to track its exact flux circle. The pulse width modulation strategy of the present invention is a new pulse width modulation strategy, which does not use zero vector synthesis but selects three adjacent space vectors for synthesis. First, according to the volt-second balance theorem, the PWM waveform in a single sampling period, and then compare the obtained turn-on or turn-off time with the triangle wav...

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Abstract

The invention discloses a novel PWM inverter topology structure which is a novel PWM inverter topology structure with the introduction of an LC filter. The LC filter is introduced at an output end ofan inverter, and a new sinusoidal pulse width modulation (NSPWM) strategy is used to carry out modulation. According to the pulse width modulation strategy, zero vector synthesis is not used, but adjacent 3 space vectors are selected for synthesis. According to the principle of volt-second balance, a PWM waveform in a period is sampled individually, and then an obtained turn-on or turn-off time and a triangular wave are compared to obtain a turn-on signal of each phase IGBT. According to the novel PWM inverter topology structure of the invention, the NSPWM strategy is used to effectively inhibit common mode voltage, the higher harmonics of phase voltage can be filtered out by introducing the LC filter, thus the harmonic components of differential mode voltage are eliminated, phase voltageand line voltage of a purer sine wave are obtained, and the common mode voltage is greatly suppressed.

Description

technical field [0001] The invention belongs to the field of suppressing common-mode voltage and differential-mode voltage, and in particular relates to a novel PWM inverter topology structure which introduces an LC filter. Background technique [0002] With the development of power electronics technology, three-phase inverters are widely used in AC drive, active filter, new energy power generation and other fields. [0003] The PWM modulation strategy plays an important role in the three-phase inverter. However, the output voltage of the inverter after using the PWM modulation strategy is a pulse width voltage, which is very unfavorable for the motor system. For the motor system, the lower the common mode component of the three-phase power supply, the better, and a relatively pure sinusoidal differential mode component is also required. At present, there are mainly hardware methods and software methods to solve the problem of inverter output common mode voltage at home an...

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Application Information

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IPC IPC(8): H02M7/5395H02M1/12
CPCH02M1/12H02M7/5395H02M1/123
Inventor 申茂军
Owner 申茂军
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