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Device and method for eliminating grid-connected current zero-crossing distortion of unipolar control single-phase grid-connected inverter

A zero-crossing distortion and inverter technology, applied in output power conversion devices, single-grid parallel feeding arrangements, conversion of AC power input to DC power output, etc. The effect of eliminating waveform distortion, simple algorithm and easy digital realization

Inactive Publication Date: 2011-05-25
HARBIN INST OF TECH
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of grid-connected current zero-crossing distortion in existing unipolar control single-phase grid-connected inverters, and to provide a method for eliminating the grid-connected current zero-crossing point of unipolar control single-phase grid-connected inverters Distortion apparatus and method

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  • Device and method for eliminating grid-connected current zero-crossing distortion of unipolar control single-phase grid-connected inverter
  • Device and method for eliminating grid-connected current zero-crossing distortion of unipolar control single-phase grid-connected inverter
  • Device and method for eliminating grid-connected current zero-crossing distortion of unipolar control single-phase grid-connected inverter

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specific Embodiment approach 1

[0031] Specific embodiment one: the following combination Figure 1 to Figure 10 To illustrate this embodiment, first analyze the causes of zero-crossing distortion through the unipolar current hysteresis control method of the grid-connected inverter:

[0032] (1) Principle of unipolar current hysteresis control method of grid-connected inverter

[0033] The schematic diagram of the single-phase voltage grid-connected inverter is shown in the figure. figure 1 As shown, a full-bridge structure is used. The schematic diagram of unipolar current hysteresis control is as follows figure 2 shown, the basic idea is that V 1 , V 2 As the direction arm, the driving signals of the two are logically opposite, and are obtained according to the polarity of the grid voltage, which is the same as the grid voltage frequency; V 1 , V 2 As the modulation arm, the driving signals of the two are logically opposite. The formation principle of the driving signal is to set a small loop width ...

specific Embodiment approach 2

[0087] Embodiment 2: This embodiment is a method for implementing the device for eliminating the zero-crossing point distortion of the grid-connected current of a unipolar control single-phase grid-connected inverter described in Embodiment 1. The method includes the following steps:

[0088] Step 1. The grid-connected current sampling module 4 collects the instantaneous value i of the grid-connected current g , the grid voltage sampling module 5 collects the instantaneous value e of the grid voltage, and sets the amplitude I of the grid-connected current given by the input signal m * ;

[0089] Step 2, obtain the angular frequency ω of the grid voltage, the current phase angle of the grid voltage and the sine value of the phase angle from the instantaneous value e of the grid voltage, according to the amplitude I of the given grid-connected current m * and the sine value of the current phase angle of the grid voltage to obtain the instantaneous value i of the given grid-co...

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Abstract

The invention discloses a device and a method for eliminating the grid-connected current zero-crossing distortion of a unipolar control single-phase grid-connected inverter, which belong to the field of transformation of electrical energy and aim to solve the problem of the grid-connected current zero-crossing distortion of the conventional unipolar control single-phase grid-connected inverter. The method provided by the invention comprises the following steps of: 1, obtaining an instantaneous value ig of a grid-connected current and the instantaneous value e of a power grid voltage, and setting the amplitude Im<*> of a given grid-connected current of an input signal; 2, obtaining the instantaneous value ig<*> of the given grid-connected current, comparing the ig<*> with the ig, and generating two paths of switching signals as control signals of a second bridge arm; 3, obtaining a phase difference; and 4, commonly inputting a sine value of a current phase angle of the power grid voltage and the phase difference obtained by the step 3 into a switching signal generation module, and generating the two paths of switching signals as the control signals of a first bridge arm to realize closed loop control over the grid-connected current and eliminate the grid-connected current zero-crossing distortion of the conventional unipolar control single-phase grid-connected inverter.

Description

technical field [0001] The invention relates to a device and a method for eliminating the zero-cross point distortion of a grid-connected current of a unipolar control single-phase grid-connected inverter, belonging to the field of electric energy conversion. Background technique [0002] In today's society, the energy problem is becoming more and more prominent, and the form of distributed grid-connected power generation represented by renewable energy power generation has become an effective means to solve this problem. In order to avoid the harmonic and reactive power pollution to the public power grid caused by the distributed power generation source being merged into the public power grid, the grid-connected inverter in the power generation system is required to have excellent control performance. Therefore, the improvement of the control performance of grid-connected inverters has received extensive attention. For clean and efficient grid connection performance, preci...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/5387
Inventor 骆素华吴凤江彭浩荣
Owner HARBIN INST OF TECH
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