A multi-input photovoltaic inverter control method and system

A photovoltaic inverter and control method technology, applied in the field of control, can solve problems such as complex control of photovoltaic inverters, and achieve the effect of simple and reliable implementation and overcoming complex control

Active Publication Date: 2016-01-20
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0006] In view of this, the present invention provides a multi-input photovoltaic inverter control method and system to solve the problem of complex control of photovoltaic inverters in the prior art. The specific scheme is as follows:

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  • A multi-input photovoltaic inverter control method and system
  • A multi-input photovoltaic inverter control method and system
  • A multi-input photovoltaic inverter control method and system

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Embodiment Construction

[0070] 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.

[0071] The invention discloses a multi-input photovoltaic inverter control method, wherein, when there are multiple PV photovoltaic strings, an independent access mode or a parallel access mode can be adopted.

[0072] Specifically, when the PV strings adopt the independent access mode, the flow chart of the multi-input photovoltaic inverter control method is as follows: figure 2 shown, including:

[0073] Step S21, tracking the maximum power point of each D...

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Abstract

The invention discloses a multi-input photovoltaic inverter control method and system. In an independent connection mode, by obtaining difference between maximum power point directive voltage of each loop of photovoltaic module string and the actual PV voltage of the loop and obtaining the duty ratio of the loop through regulation, the control of a switching tube of each DC / DC circuit is realized and thus the control of the photovoltaic inverter is realized; in parallel connection mode, by obtaining difference between maximum power point directive voltage of a DC / DC circuit of a master loop and the actual PV voltage of the loop and obtaining the duty ratio of the master loop through regulation, the control of switching tubes of the master loop and the DC / DC circuits of each slave loop is realized and thus the control of the photovoltaic inverter is realized. By obtaining the duty ratio of multiple loops or one loop in the independent connection mode and the parallel connection mode, the scheme realizes the control of the photovoltaic inverter, the realization method is simple and reliable and the complex control of multiple loops of DC / DC circuits in the prior art is avoided.

Description

technical field [0001] The invention relates to the control field, in particular to a multi-input photovoltaic inverter control method and system. Background technique [0002] The system architecture of small and medium power photovoltaic inverters is as follows: figure 1 As shown, usually multiple PV strings are converted by multiple DC / DC circuits and then connected to a common DC bus, and one DC / AC inverter is used for inverter output control. If the input of any number of DC / DC circuits is the same group of photovoltaic strings, define the connection mode as parallel connection mode; if the input of any number of DC / DC circuits are independent photovoltaic strings, define the connection The mode is independent access mode. [0003] The current control method for photovoltaic inverters with DC / DC circuits is mainly to consider the independent access mode and the parallel access mode separately. For different access modes, a set of different maximum power point tracking...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67H02M3/00H02S40/30
CPCY02E10/56
Inventor 郑群李浩源梅晓东孙维张芳坡汪昌友
Owner SUNGROW POWER SUPPLY CO LTD
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