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Grid connection current soft start and soft stop method and system for photovoltaic grid-connected inverter

A technology of inverter and soft shutdown, applied in photovoltaic power generation, electrical components, single-network parallel feeding arrangement, etc., can solve the problems of increased hardware cost, large power loss, high hardware cost, etc., and achieve low hardware cost and low power loss Small, to overcome the effect of large power loss

Active Publication Date: 2014-05-14
XINJIANG HOPE ELECTRONICS
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Problems solved by technology

This method needs to increase the cost of hardware, and also has the problem of power loss due to resistance
[0004] In the process of realizing the present invention, the inventor found that there are at least defects such as high hardware cost and large power loss in the prior art

Method used

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  • Grid connection current soft start and soft stop method and system for photovoltaic grid-connected inverter
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  • Grid connection current soft start and soft stop method and system for photovoltaic grid-connected inverter

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Embodiment Construction

[0039] 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.

[0040] For the solution using software, specifically, the combination of feedforward technology and ramp reference can make the output current of the inverter rise slowly, which can alleviate the current impact during the starting process to a certain extent. The technical solution of the present invention focuses on the accurate tracking of the maximum power point while the output current of the inverter rises slowly; in addition, when the inverter receives a shutdown command, the output current of the inverter drops slowly to perform soft off-grid, It is beneficial to increase the stability of the power grid.

[0041] According to an embodiment of the present inve...

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Abstract

The invention discloses a grid connection current soft start and soft stop method and system for a photovoltaic grid-connected inverter. The method mainly includes the steps of increasing an output current of the photovoltaic grid-connected inverter from zero step by step in the soft start process through a voltage outer loop control method where a slope reference voltage link unit and a variable-proportion integral coefficient are combined, and judging whether the soft start process is terminated or not by detecting whether output of a photovoltaic cell array reaches the largest power point or not in real time, and / or includes the steps of decreasing the output current of the photovoltaic grid-connected inverter from the largest value step by step in the soft stop process, and judging whether the soft stop process is terminated or not by detecting whether output of the photovoltaic cell array reaches the set smallest power value or not in real time. By means of the grid connection current soft start and soft stop method and system for the photovoltaic grid-connected inverter, the defects that in the prior art, hardware cost is high and power consumption is large can be overcome, and the advantages of being low in hardware cost and small in power consumption are achieved.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic grid-connected power generation, in particular to methods and systems for soft start and soft shutdown of grid-connected current for photovoltaic grid-connected inverters. Background technique [0002] Photovoltaic grid-connected power generation technology is increasingly valued by governments of various countries. The photovoltaic industry is in its infancy in my country, and many key technologies are expected to be resolved. How to reduce the grid-connected impact current is one of the key technologies of photovoltaic grid-connected inverters. [0003] The solution to using software and hardware is to connect the power resistor in series with the power grid on the output side of the photovoltaic grid-connected inverter, and then short-circuit the power resistor after the starting current reaches a certain value. This method needs to increase the cost of hardware, and also has the pr...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M1/36
CPCY02E10/56
Inventor 戴伟孙向东陈芳王建渊张琦刘越李科
Owner XINJIANG HOPE ELECTRONICS
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