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Start-up control method and device for photovoltaic inverter

A photovoltaic inverter and start-up control technology, which is applied in the field of solar power generation, can solve the problems of poor effect and high cost, and achieve the effect of avoiding repeated start-up and increasing the total power generation

Active Publication Date: 2016-04-20
SUZHOU INOVANCE TECH CO LTD
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a start-up control method for photovoltaic inverters that can effectively avoid repeated start-ups in view of the defects of poor effect or high cost of repeated start-ups in the existing start-up control methods for photovoltaic inverters. Control method and device

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] The present invention conceives a start-up control method and device of a photovoltaic inverter, and a solar power generation system using the device, which is used to automatically search and record the optimal start-up voltage threshold of the photovoltaic inverter, which can avoid repeated start-up, It also allows the system to start up and run as quickly as possible in the early morning, thereby increasing the total power generation of the system.

[0030] Such as figure 1 and figure 2 As shown, the output voltage and output current of photovoltaic cells are affected by the external environment, such as light intensity and temperature. Therefore, different light intensities correspond to inconsistent open-circuit voltages of photovolt...

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Abstract

The invention relates to a startup control method and a device for a photovoltaic inverter. The startup control method comprises the following steps of voltage detection: executing a startup judgment step if detecting that open-circuit voltage of a photovoltaic cell is greater than a startup voltage threshold; startup judgment: transmitting a startup signal to the photovoltaic inverter, judging whether startup is successful, executing a voltage increasing step if not, and executing a voltage saving step if so; voltage increasing: adding a preset voltage step value based on the current startup voltage threshold and transmitting to the voltage detection step for re-detection; and voltage saving: saving the current startup voltage threshold for next startup of the photovoltaic inverter. According to the method and the device, the optimal startup voltage threshold of the photovoltaic inverter is searched automatically, the repeated startup can be avoided, and a system can operate as soon as possible during the next startup, so that the gross generation of the system is increased.

Description

technical field [0001] The present invention relates to the technical field of solar power generation, and more specifically, to a method and device for starting up a photovoltaic inverter. Background technique [0002] At present, as countries around the world attach importance to energy conservation and emission reduction, the government has increased support for new energy, and the solar power industry has also developed rapidly. However, since the power generation of photovoltaic cells is closely related to the external environment such as light and temperature, the uncertainty of the external environment leads to the instability of photovoltaic power generation. At night or in cloudy conditions, when the solar cells cannot provide energy, the photovoltaic power generation equipment is required to be turned off. When the conditions are right, the photovoltaic inverter is required to automatically start to provide energy for the grid. How to accurately judge whether the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36
CPCY02E10/56
Inventor 李龙文王建俊
Owner SUZHOU INOVANCE TECH CO LTD
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