Specific harmonic wave eliminating system and method

A specific harmonic elimination and specific harmonic elimination technology, applied in the field of specific harmonic elimination system, can solve the problems of slow calculation speed and low solution accuracy of PWM inverter

Inactive Publication Date: 2013-04-03
SHENZHEN JINGFUYUAN TECH
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  • Abstract
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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to solve the technical problems of slow calculation speed and low solution accuracy in the ma

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  • Specific harmonic wave eliminating system and method
  • Specific harmonic wave eliminating system and method

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Embodiment Construction

[0068] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0069] Such as figure 1 As shown, the PWM pulse width modulation of the PWM inverter is a method of modulating the triangular carrier signal with the sine wave signal to obtain the output sine pulse width. Usually the circuit is mainly composed of AC power supply, filter circuit, rectifier circuit, intermediate link, inverter circuit and AC. The AC power supply first filters out clutter through the filter circuit, and then rectifies the AC power into DC power after the rectifier circuit, and then passes through the intermediate link. The inverter circuit is then used to invert the alternating curr...

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Abstract

The invention provides a specific harmonic wave eliminating system comprising a PWM (Pulse Width Modulation) inverter and a main control unit which controls the PWM inverter to convert direct current into alternating current and supply power to an alternating load; the main control unit comprises a obtaining sub-unit, an establishing sub-unit, a computing sub-unit and a control sub-unit; the obtaining sub-unit is used for obtaining a voltage output waveform of the PWM inverter; the establishing sub-unit is used for establishing a bipolar specific harmonic elimination mathematical model according to the voltage output waveform of the obtaining sub-unit; the computing sub-unit is used for computing out an exact solution of a switching angle by using a homotopy differential method and a Newton iteration method according to the bipolar specific harmonic elimination mathematical model in the establishing sub-unit; and the control sub-unit is used for controlling the on-off time of a switching tube in the PWM inverter according to the exact solution of the switching angle in the computing sub-unit. The system can effectively eliminate the influence of a harmonic wave.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a specific harmonic elimination system and method thereof. Background technique [0002] With the development of microelectronics, computer technology and other related disciplines, as one of the most basic devices in modern power electronics technology, the inverter using PWM-Pulse Width Modulation technology, that is, PWM inverter, is Developed with the development of power electronic devices. PWM technology has been used as the main control technology of PWM inverter, and its excellent performance makes the inverter using PWM control technology widely used. With the wide application of PWM inverters, power electronic devices have become the biggest source of interference. Due to the limitation of control technology and switching frequency, the harmonic content in the output waveform is relatively high, which is mainly caused by various power electronic devices, tr...

Claims

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Application Information

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IPC IPC(8): H02M1/12
Inventor 刘晓红陈恒留
Owner SHENZHEN JINGFUYUAN TECH
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