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Current equalizing control method of double BOOST circuits of two-stage photovoltaic power generation system

A photovoltaic power generation system and flow control technology, applied in photovoltaic power generation, photovoltaic modules, electrical components, etc., can solve the problems of uneven current flow and shortened life of dual boost circuits

Inactive Publication Date: 2015-01-14
XJ ELECTRIC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a dual BOOST circuit current sharing control method for a two-stage photovoltaic power generation system to solve the problems of shortened life and overcurrent shutdown caused by uneven current of dual BOOST circuits

Method used

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  • Current equalizing control method of double BOOST circuits of two-stage photovoltaic power generation system
  • Current equalizing control method of double BOOST circuits of two-stage photovoltaic power generation system
  • Current equalizing control method of double BOOST circuits of two-stage photovoltaic power generation system

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Embodiment Construction

[0019] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0020] The structure of the double BOOST circuit of the two-stage photovoltaic power generation system of the present invention is as follows figure 1 As shown in the upper part of , the front stage BOOST circuit completes the boost function, and the rear stage inverter circuit completes the inverter function. In order to make the currents flowing through BOOST1 and BOOST2 equal, a current sharing control method needs to be added. figure 1 The lower part of gives the control structure, as can be seen from the figure, the method includes the following steps:

[0021] (1) Sample the input currents of the two BOOST circuits in real time, set the current of the BOOST1 circuit as the reference current I_ref, and the current of the BOOST2 circuit as I_fdb, and calculate the error of the difference between the two currents;

[0022] Error=I ref -I ...

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Abstract

The invention discloses a current equalizing control method of double BOOST circuits of a two-stage photovoltaic power generation system. The currents of the two BOOST circuits are sampled in real time through a system. The input current of one BOOST circuit serves as the reference, a duty ratio increment is worked out through the two BOOST input currents by means of a PI regulator, the on-off time (namely the duty ratio) of a switching device of the other BOOST circuit is corrected with the increment, and thus the currents of the two BOOST circuits are made equal. The problem that the currents of the two BOOST circuits running in parallel connection are unequal is solved, and thus the problems that the service life of a device with an overcurrent circuit becomes shorter, and an inverter is shut down due to overcurrent are avoided.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a dual BOOST circuit current sharing control method for a two-stage photovoltaic power generation system. Background technique [0002] In recent years, string photovoltaic inverters have developed rapidly. String inverters have multi-channel MPPT (maximum power point tracking) tracking capabilities. Each group of MPPTs can be independently controlled to track the maximum power point, which can Effectively reduce the impact of photovoltaic arrays not being able to output maximum power due to partial shading or inconsistent module characteristics. Compared with centralized inverters, string photovoltaic inverters have high power generation efficiency and a wide MPPT voltage range. In distributed photovoltaic It will be applied on a large scale in the power generation system, and it will also be applied to a certain extent in some large photovoltai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/32H02M7/5387
CPCY02E10/56H02S40/00H02M3/156
Inventor 赵建荣黄辉张海龙孟向军王林曹建博肖飞
Owner XJ ELECTRIC
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