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A method for controlling the output voltage of a photovoltaic microgrid inverter

A technology of output voltage control and micro-grid, applied in photovoltaic power generation, conversion of irreversible DC power input to AC power output, output power conversion device, etc., can solve the problem of inconvenient use, high harmonic content, poor stability, etc. problem, achieve good stability, overcome high harmonic content, and good sine degree

Active Publication Date: 2017-09-08
XINJIANG HOPE ELECTRONICS
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Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that there are at least defects such as high harmonic content, poor stability and inconvenient use in the prior art

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  • A method for controlling the output voltage of a photovoltaic microgrid inverter
  • A method for controlling the output voltage of a photovoltaic microgrid inverter
  • A method for controlling the output voltage of a photovoltaic microgrid inverter

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Embodiment Construction

[0026] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0027] The local load is divided into a linear load composed of a resistor R, an inductor L, and a capacitor C, and a nonlinear load composed of a rectifier diode. Photovoltaic inverters under micro-grid conditions mostly use LC filters for output filtering. In the off-grid mode, the outer loop of the controller adopts the output voltage feedback loop, and the inner loop of the controller can adopt two kinds of current feedback control according to the difference of the feedback current: the current of the filter inductor L is collected in real time as the object of the inner loop of the system control, this current Feedback control has a good effect on the voltage ...

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Abstract

The invention discloses a method for controlling the output voltage of a photovoltaic micro-grid inverter, which mainly includes: during the operation of the photovoltaic micro-grid inverter, real-time acquisition of the a-phase voltage, performing fast Fourier FFT analysis on it, and calculating the total voltage harmonics Content THD, adjust the three-phase current factors of a, b, and c at the same time according to the total voltage harmonic content THD; multiply the filter inductor current of each phase of a, b, and c by the current factor, and multiply the filter capacitor current by 1 to subtract the current Factor, the sum of the mixed currents of the two is used as the feedback current of each phase, so that the harmonics of the output voltage of the photovoltaic microgrid inverter are gradually reduced to the preset threshold. The photovoltaic microgrid inverter output voltage control method of the present invention can overcome the defects of high harmonic content, poor stability and inconvenient use in the prior art, so as to realize the advantages of low harmonic content, good stability and convenient use .

Description

technical field [0001] The present invention relates to the application field of photovoltaic microgrid systems, in particular to a method for controlling the output voltage of a photovoltaic microgrid inverter. Background technique [0002] The solar photovoltaic power generation industry has been paid more and more attention by people, which has led to rapid development of photovoltaic power generation systems in both grid-connected and off-grid fields, driving the rapid advancement of photovoltaic micro-grid systems. Photovoltaic microgrid systems require photovoltaic inverters to work in both grid-connected and off-grid modes. In the grid-connected mode, the large power grid provides voltage support, and the photovoltaic inverter generally adopts the PQ power control method to realize the grid-connected current control; in the off-grid mode, the photovoltaic inverter itself provides voltage for the local load. [0003] In the process of realizing the present invention, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H02M7/48
CPCY02E10/56
Inventor 戴伟陈芳孙向东张琦王建渊王月盈
Owner XINJIANG HOPE ELECTRONICS
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