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A grid-connected inverter hybrid modulation device and modulation method thereof

A hybrid modulation and inverter technology, applied in the parallel feeding arrangement of single grid, reactive power adjustment/elimination/compensation, reactive power compensation, etc., can solve the problem of affecting inverter efficiency, increasing switching loss, grid-connected current Distortion and other problems, to achieve the effect of suppressing distortion, improving conversion efficiency, and occupying less memory

Active Publication Date: 2016-07-06
扬州智创企业运营管理服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that although the above method can solve the distortion problem of the grid-connected current when the grid voltage crosses zero, it increases the switching loss and affects the efficiency of the inverter.

Method used

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  • A grid-connected inverter hybrid modulation device and modulation method thereof
  • A grid-connected inverter hybrid modulation device and modulation method thereof
  • A grid-connected inverter hybrid modulation device and modulation method thereof

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Embodiment Construction

[0029]The present invention will be further described below in conjunction with specific embodiments.

[0030] Such as Figure 1-2 A grid-connected inverter hybrid modulation device is shown, the modulation device includes a main circuit and a control circuit, the main circuit includes a full-bridge inverter connected to a DC power supply and the grid, and the control circuit includes an input conditioning circuit , an output conditioning circuit, a digital signal processor, and a switch tube drive circuit, the digital signal processor has a built-in input AD sampling interface AD1, an output AD sampling interface AD0AD2, a voltage controller, a current controller, a phase-locked loop, and a hybrid modulation generator device, the signal output end of the input conditioning circuit is connected to the signal input end of the voltage controller through the input AD sampling interface AD1, the signal output end of the voltage controller is connected to the current controller, an...

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Abstract

The invention discloses a grid-connected inverter hybrid modulation device and a modulation method thereof in the field of grid-connected power generation. The modulation device includes a main circuit and a control circuit. The main circuit includes a full-bridge inverter connected to a DC power supply and a grid converter, the control circuit includes an input conditioning circuit, an output conditioning circuit, a digital signal processor and a switch tube drive circuit, and the modulation method is a unipolar modulation method in the positive power area; Polarity modulation mode, the invention effectively suppresses the distortion of the grid-connected current at the zero-crossing point of the grid voltage, ensures the power quality of the grid side, and improves the conversion efficiency of the inverter. The invention can be used in a grid-connected power generation device.

Description

technical field [0001] The invention relates to a grid-connected inverter, in particular to a modulation device for a grid-connected inverter. Background technique [0002] In the existing full-bridge inverter grid-connected power generation device, in order to improve the efficiency of the inverter, a unipolar modulation strategy is usually used to control the switching of the switching tube. In the case of reactive power, since the current on the inductor cannot modulate a sinusoidal current waveform when the grid voltage crosses zero, distortion of the current waveform will occur at this time. In order to solve the grid-connected current distortion problem when the grid voltage crosses zero, the commonly used solutions are as follows: [0003] The first is to change unipolar modulation into bipolar modulation. When bipolar modulation is used, for a single-phase full-bridge grid-connected inverter, the two diagonal switching tubes receive the same drive signal, and the sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/18
CPCY02E40/30
Inventor 方宇赵齐齐尧永王明龙朱忠虎
Owner 扬州智创企业运营管理服务有限公司
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