A photovoltaic inverter startup control method, system and photovoltaic power generation system
A photovoltaic inverter and photovoltaic panel technology, which is applied in photovoltaic power generation systems and photovoltaic inverter startup control fields, can solve problems such as affecting the service life, repeated startup and shutdown, etc., and achieve the effect of reducing costs.
Active Publication Date: 2017-03-01
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
[0005] In view of this, the present invention provides a photovoltaic inverter start-up control method, system and photovoltaic power generation system to solve the problem of repeated start-up and shutdown in the prior art when judging whether to start the relay for grid-connected work based on the magnitude of the input voltage , the problem that affects the service life, the specific plan is as follows:
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[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0051] The invention discloses a photovoltaic inverter start-up control method, the flow chart of which is as follows figure 1 shown, including:
[0052] Step S11, obtaining the input voltage value of the photovoltaic inverter;
[0053] Step S12, when the input voltage of the photovoltaic inverter is greater than the startup threshold, control the operation of the fan of the photovoltaic inverter, and the fan is powered by the input side of the photovoltaic inv...
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The invention discloses a photovoltaic inverter start-up control method, system and photovoltaic power generation system. When the input voltage of the photovoltaic inverter is greater than the start-up threshold, the operation of the fan of the photovoltaic inverter is controlled, and the operation of the fan is used as a load to obtain The input voltage drop before and after the fan is running. When the input voltage drop is less than or equal to the voltage judgment threshold, the photovoltaic inverter is controlled to start grid-connected work. In this solution, the fan of the photovoltaic inverter is used as the load, and no external DC or AC dummy load is required, which reduces the cost of additional hardware; in addition, the voltage judgment threshold is based on the input of the photovoltaic inverter when it is connected to the grid for the first time on the day and reaches the maximum power point The size of the power is corrected so that the voltage judgment threshold is a dynamic threshold, which is changed according to the actual situation, avoiding the problem of reducing the service life of the relay due to frequent startup of the photovoltaic inverter when the voltage is appropriate and the power is small.
Description
technical field [0001] The present invention relates to the field of photovoltaic power generation, in particular to a photovoltaic inverter startup control method, system and photovoltaic power generation system. Background technique [0002] As a major renewable technology, photovoltaic power generation technology has been widely used in many countries and regions. Photovoltaic power generation technology uses photovoltaic panels to absorb solar energy and convert it into direct current. After the maximum power tracking control of photovoltaic inverters, the maximum direct current output by photovoltaic panels is converted into alternating current for load use. [0003] Photovoltaic power generation technology has a direct relationship with sunlight. When the solar radiation intensity gradually increases in the morning, the output voltage of the photovoltaic array increases and reaches the start-up voltage required for the inverter to work, and the photovoltaic inverter s...
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IPC IPC(8): H02J3/38H02S40/32
CPCH02S40/32H02S40/425H02M1/36H02M7/44H02J2300/24H02J3/381Y02E10/56H02J2300/26
Inventor 李晓迅韩志强李浩源梅晓东吴透明何超宋炀
Owner SUNGROW POWER SUPPLY CO LTD