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Photovoltaic grid-connected inverter low-voltage ride through method based on reactive current injection

A low-voltage ride-through and current injection technology, applied in AC network voltage adjustment, photovoltaic power generation, reactive power compensation, etc. Balance and other issues to achieve the effect of improving power generation efficiency

Active Publication Date: 2015-06-24
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the grid voltage drops deeply, if the low voltage ride through control is not adopted, the power generated by the photovoltaic array and the grid-connected power will be unbalanced, which will lead to overcurrent of the photovoltaic grid-connected inverter, rise of DC side voltage and overcurrent of the photovoltaic converter off-grid

Method used

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  • Photovoltaic grid-connected inverter low-voltage ride through method based on reactive current injection
  • Photovoltaic grid-connected inverter low-voltage ride through method based on reactive current injection
  • Photovoltaic grid-connected inverter low-voltage ride through method based on reactive current injection

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Embodiment Construction

[0028] The present invention will be described in further detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0029] figure 1It is a low-voltage ride-through control topology diagram of photovoltaic grid-connected inverters, and the entire analysis and simulation verification are based on this diagram. PV in the figure refers to the photovoltaic power generation system, i pv , u pv is the output current and output voltage of the photovoltaic power generation system, C 1 is the smoothing capacitor, L boost is the inductance of the DC side of the photovoltaic grid-connected inverter, and the current flowing through the inductance is i L , S pv is the switching function of the boost circuit thyristor, and its specific value is S 1 or S 2 , C dc It is the voltage stabilizing capacitor on the output side of the boost circuit, and the voltage on it is u dc , S a and S b and...

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Abstract

The invention discloses a photovoltaic grid-connected inverter low-voltage ride through method based on reactive current injection. The method is based on a low-voltage ride through strategy supported by reactive current voltage, is aimed at an photovoltaic grid-connected inverter, switches voltage and current double-loop control of an inverter circuit into current single-loop control, switches an maximum power point tracking (MPPT) of a boost circuit into voltage stability control, and finally achieves low-voltage ride through of the photovoltaic grid-connected inverter. The method is simple and practical. When a power grid breaks down and the voltage of the power grid is reduced, the photovoltaic grid-connected inverter can be made to achieve low-voltage ride through by switching the control strategy of the photovoltaic grid-connected inverter, and the voltage of the power grid is supported to recover.

Description

technical field [0001] The invention belongs to the technical field of low-voltage ride-through, and in particular relates to a low-voltage ride-through method of a photovoltaic grid-connected inverter based on reactive current injection. Background technique [0002] With the development of the world economy, people's demand for energy is also increasing. As a green renewable energy, solar energy has been widely concerned and developed in recent years, especially in some developed countries in Europe and the United States. Photovoltaic power generation accounts for the proportion of grid power supply. keep improving. my country has abundant solar energy resources. According to estimates, more than 2 / 3 of the country's annual sunshine time is greater than 2000h, and the annual average solar radiation is about 5900MJ / m 2 , especially Tibet, Xinjiang, Inner Mongolia, Ningxia and other western provinces are particularly rich, very suitable for the development of photovoltaic p...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/16
CPCH02J3/16H02J3/385Y02E10/56Y02E40/30
Inventor 杨苹许志荣周述前郑群儒陈柱杨春梦
Owner SOUTH CHINA UNIV OF TECH
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