A global scan method for maximum power point, inverter and photovoltaic system

A technology of maximum power point and scanning method, which is applied in photovoltaic power generation, control/regulation systems, instruments, etc., to achieve the effect of reducing system control logic and increasing power generation

Active Publication Date: 2017-02-22
SUNGROW POWER SUPPLY CO LTD
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  • Description
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Problems solved by technology

[0004] In view of this, the present invention provides a method for global scanning of the maximum power point, an inverter and a photovoltaic system to solve the problem of lack of global scanning for inverters with multiple PV inputs in the prior art

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  • A global scan method for maximum power point, inverter and photovoltaic system
  • A global scan method for maximum power point, inverter and photovoltaic system
  • A global scan method for maximum power point, inverter and photovoltaic system

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Embodiment Construction

[0033] 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.

[0034] The present invention provides a method for global scanning of the maximum power point to solve the problem of lack of global scanning for the multiple PV inputs in the prior art.

[0035] Specifically, such as figure 2 As shown, the maximum power point global scanning method is applied to an inverter 101 with multiple PV inputs (PV1 to PVN) in a photovoltaic system, and the inverter 101 includes multiple DCs connected to the multiple PV inputs respect...

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Abstract

The invention provides a maximum-power-point global scanning method, an inverter and a photovoltaic system. The maximum-power-point global scanning method includes: firstly, judging whether global scanning is needed or not; secondly, when global scanning is needed, subjecting busbar voltage of the inverter in the photovoltaic system to judgment, maximum-power-point scanning and processing; thirdly, processing operating states of DC (direct current) / DC converters; fourthly, subjecting multi-channel PV input to maximum-power-point global scanning so as to find a maximum power point of each PV array; finally, after maximum-power-point global scanning is terminated, subjecting the multi-channel PV input of the inverter to normal MPPT (maximum power point tracking) scanning. By the maximum-power-point global scanning method, the problem that global scanning of multi-channel PV input of an inverter lacks in the prior art is solved, generating capacity is increased and system control logic is reduced.

Description

technical field [0001] The invention relates to the technical field of photovoltaic inverters, in particular to a method for global scanning of maximum power points, an inverter and a photovoltaic system. Background technique [0002] In a photovoltaic power generation system, in order to solve the power mismatch problem of each photovoltaic module due to dust, shading, aging and other reasons, MPPT (max power point tracking, maximum power point) scanning is usually added for each photovoltaic string to Ensure that each photovoltaic string works at the maximum power point, ensure the maximum output power of the battery panel, and improve the overall efficiency of the system. [0003] At the same time, in order to ensure that the system can generate electricity in the case of insufficient light, the existing technology usually adopts figure 1 The inverter 101 shown in the inverter 101 includes multiple PV array inputs (PV1 to PVN), multiple DC / DC converters 111, DC / AC conver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 耿后来徐清清曹金虎邢军李浩源梅晓东
Owner SUNGROW POWER SUPPLY CO LTD
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