Hybrid driven low harmonic inversion control method and modulation mode switching circuit thereof

A technology of inverter control and modulation mode, applied in the field of power electronics, can solve problems such as affecting the quality of inverter output AC power, inverter distortion, and increase in output voltage or current harmonics, achieving easy implementation and simple hardware circuit structure , the effect of low cost

Inactive Publication Date: 2012-10-03
SOUTHEAST UNIV
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Problems solved by technology

[0004] During the actual application of unipolar SPWM and bipolar SPWM, the output waveform of the inverter will be distorted to varying degrees due to the limitation of its inherent characteristics, and the unipolar modulation will make the inverter output Distortion occurs near the zero-crossing point of the sine wave, and bipolar modulation will cause the inverter output to be distorted near the sine peak value. Both of these distortions will increase the harmonics of the output voltage or current and affect the quality of the inverter output AC power.

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  • Hybrid driven low harmonic inversion control method and modulation mode switching circuit thereof
  • Hybrid driven low harmonic inversion control method and modulation mode switching circuit thereof
  • Hybrid driven low harmonic inversion control method and modulation mode switching circuit thereof

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Embodiment Construction

[0039] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0040] The modulation mode switching circuit in the low harmonic inverter control of the hybrid drive of the present invention, the schematic diagram of the circuit structure is shown in Figure 7 (a), the modulation mode switching circuit includes a first AND gate 1, a second AND gate 2, and an OR gate 3 and isolation 5, the output terminals of the first AND gate 1 and the second AND gate 2 are respectively connected to the input terminal of the OR gate 3, the output terminal of the OR gate 3 is connected to the input terminal of the isolation 5, and the output terminal of the isolation 5 is connected to the inverse The input end of the switch tube 4 of the transformation system is connected, and the output of the first AND gate 1 and the second AND gate 2 is used as the input of the OR gate 3 . In the hybrid drive lo...

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Abstract

The invention discloses a hybrid driven low harmonic inversion control method and a modulation mode switching circuit thereof. An inversion control technology of monopolar modulation and ambipolar modulation is used in one sinusoidal period in a mixed way, the ambipolar modulation is used in intervals before and after the zero crossing point of the sinusoidal period, and the monopolar modulation is used in other intervals of the sinusoidal period, the time ratio of the monopolar modulation to the ambipolar modulation in one sinusoidal period is controlled by setting different control parameters, under the condition of the same control parameter and circuit parameter, and the voltage or current harmonics output by the inverter can be effectively reduced. The invention is especially suitable for the grid-connected inverter control in renewable energy sources.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a modulation mode switching circuit in low-harmonic inverter control of a hybrid drive. Background technique [0002] The technology of converting DC to AC is called inverter. In order to obtain pure sine wave output and reduce harmonics in output voltage or current, SPWM (Sinusoidal Pulse Width Modulation) modulation technology is widely used in inverter in control. With the increasing demand for energy in modern society, the available primary energy such as coal and oil is less and less, and the waste gas and waste generated in the process of coal and oil utilization are seriously polluting the natural environment, which is harmful to human health and Life does a lot of harm. In order to avoid energy crisis and protect the environment, people began to use renewable energy. Therefore, distributed power generation systems using renewable energy are developing rapidly. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
Inventor 王念春吴晓玉吴梅月
Owner SOUTHEAST UNIV
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