DCM single-bridge-arm integrated split source inverter control method for photovoltaic grid-connected occasion

A technology of source inverter and control method, applied in the field of control of DCM single bridge arm integrated split source inverter

Active Publication Date: 2020-12-22
NANTONG UNIVERSITY
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Problems solved by technology

[0004] In view of this, the present invention proposes a DCM single-arm integrated split source inverter control method for photovoltaic grid-connected occasions, which solves the applicatio...

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  • DCM single-bridge-arm integrated split source inverter control method for photovoltaic grid-connected occasion
  • DCM single-bridge-arm integrated split source inverter control method for photovoltaic grid-connected occasion
  • DCM single-bridge-arm integrated split source inverter control method for photovoltaic grid-connected occasion

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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] Such as figure 1 As shown, the embodiment of the present application discloses a control method for a DCM single-arm integrated split-source inverter used in photovoltaic grid-connected applications, such as figure 1 As shown in the figure (a), the photovoltaic grid-connected application uses a DCM single-leg integrated split-source inverter including photovoltaic cells and input filter capacitor C in , Input filter inductance L in , a...

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Abstract

The invention belongs to the technical field of electricity, and particularly relates to a DCM single-bridge-arm integrated split source inverter control method for a photovoltaic grid-connected occasion. The method comprises the steps: obtaining the output voltage and current of a photovoltaic cell, obtaining an input voltage reference through an MPPT algorithm, and achieving the MPPT through PIcontrol; obtaining a DC bus voltage, comparing the DC bus voltage with a reference, and outputting an amplitude instruction through PI control; obtaining power grid voltage, and calculating to obtainunit sinusoidal signals with the same frequency and phase as the power grid voltage; multiplying the unit sinusoidal signal by the amplitude instruction to obtain a sinusoidal reference; obtaining a grid current, comparing the grid current with a sine reference, and realizing sine and pure active output of the grid-connected current through PI control. By means of the method, the DCM single-bridge-arm integrated split source inverter can be applied to photovoltaic grid-connected occasions, output waveform overmodulation during light-load operation can be effectively avoided, and the output waveform quality is high. In addition, the invention provides an input filter inductor design method, which can ensure smooth implementation of the control method in the whole working range.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a control method for a DCM single-bridge integrated split-source inverter, and in particular to a control method for a DCM single-bridge integrated split-source inverter applied to photovoltaic grid-connected applications. Background technique [0002] In order to meet the voltage level requirements of electrical equipment or power grids, distributed photovoltaic power generation systems generally adopt a two-stage structure of Boost converter cascaded Voltage Source Inverter (Voltage Source Inverter, VSI). This solution can better adapt to the wide variation range of the input voltage, and the control is relatively simple, but the number of power devices is large, and the overall efficiency is difficult to further improve. In recent years, some scholars have proposed a single-leg integrated split-source inverter, which inputs the filter inductor L in The midpoint of a bridg...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M7/5395H02J3/38
CPCH02J3/381H02M7/53871H02M7/5395H02J2300/26Y02E10/56
Inventor 秦岭沈家鹏段冰莹许兴周磊高娟田民钱天泓马宇昂
Owner NANTONG UNIVERSITY
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