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Multi-mode control method and multi-mode control system for photovoltaic grid-connected inverter with duplex parallel structure

A control system and inverter technology, applied in photovoltaic power generation, AC network circuit, single-network parallel feeding arrangement, etc., to achieve the effect of small self-loss, small output harmonics, and reduced daily loss

Active Publication Date: 2015-03-18
CSIC HAIWEI ZHENGZHOU HIGH TECH CO LTD
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  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem of improving the service life of existing dual-type photovoltaic inverters, and provides a multi-mode control method for photovoltaic grid-connected inverters with double-parallel structures and long service life

Method used

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  • Multi-mode control method and multi-mode control system for photovoltaic grid-connected inverter with duplex parallel structure
  • Multi-mode control method and multi-mode control system for photovoltaic grid-connected inverter with duplex parallel structure

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Embodiment Construction

[0018] like figure 1 As shown, the multi-modal control method of the photovoltaic grid-connected inverter with dual parallel structure in the present invention is actually a solution for a grid-connected photovoltaic power generation system. The grid-connected photovoltaic power generation system mentioned above includes: photovoltaic modules, three-phase photovoltaic grid-connected inverters and power grids. Three-phase grid-connected photovoltaic power generation system is the main form of large-scale photovoltaic power generation system, with complex structure, high power, high technical requirements and high efficiency. It generally uses a three-phase full-bridge inverter; photovoltaic modules are usually composed of solar cells connected in series.

[0019] The invention first detects the output power of the photovoltaic grid-connected inverter in real time. The sensors of the inverter can only detect the grid voltage and output current, and they are all three-phase AC q...

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Abstract

The invention discloses a multi-mode control method for a photovoltaic grid-connected inverter with a duplex parallel structure. Real-time detection is performed on the output power of the photovoltaic grid-connected inverter; when the output power of the inverter is less than 2 percent of rated power, the inverter enters a stand-by state, and two sets of inversion unit modules respectively stop working; when the output power of the inverter is greater than 2 percent of the rated power and less than 45 percent of the rated power, the inverter enters a low-power state, and only one set of inversion unit modules is started to work; when the output power of the inverter is greater than 45 percent of the rated power, the inverter enters a high-power state, and the two inversion unit modules are both in a working state. According to the multi-mode control method for the photovoltaic grid-connected inverter with the duplex parallel structure, disclosed by the invention, under the stand-by mode, the two sets of inversion unit modules stop working; under the low-power mode, only one set of inversion unit modules works; under the high-power mode, the two sets of inversion unit modules work simultaneously, and thus, the daily loss of the inverter is reduced; the multi-mode control method for the photovoltaic grid-connected inverter with the duplex parallel structure, disclosed by the invention, has the advantages of being low in switching frequency, small in self-loss, small in output harmonic, and the like, and a greener energy resource can be provided for power grids.

Description

technical field [0001] This intellectual achievement belongs to the technical field of solar photovoltaic power generation, and specifically relates to a control method for a low-power dual solar photovoltaic grid-connected inverter. Background technique [0002] With the gradual depletion of conventional energy sources and various safety issues caused by them, renewable energy sources have received extensive attention from many countries in the world. Among the new renewable energy sources, photovoltaic power generation is the fastest growing, and all countries in the world regard the commercial development and utilization of solar photovoltaic power generation as an important development direction. [0003] As a key component in a photovoltaic grid-connected power station—a photovoltaic inverter, it must have the characteristics of high efficiency, low cost, and low power consumption. The efficiency and loss of high-power photovoltaic grid-connected inverters have attract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/383Y02E10/56
Inventor 王大鹏向阳谢战洪赵惠平高瑛李满马新科王笑非王旺球
Owner CSIC HAIWEI ZHENGZHOU HIGH TECH CO LTD
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