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Photovoltaic module output characteristic curve obtaining circuit and method and photovoltaic power generation system

An output characteristic curve, photovoltaic module technology, applied in photovoltaic power generation, photovoltaic system monitoring, photovoltaic modules and other directions, can solve problems such as mismatch loss, affecting power generation, etc., to achieve the effect of comprehensive diagnosis

Active Publication Date: 2018-11-16
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to factors such as local shading, aging, and potential-induced attenuation, the output characteristics of individual photovoltaic modules may be quite different from the overall ones, so serious mismatch losses will occur after series-parallel connection, affecting the overall power generation

Method used

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  • Photovoltaic module output characteristic curve obtaining circuit and method and photovoltaic power generation system

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Embodiment Construction

[0040] 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.

[0041] see figure 1 , the embodiment of the present invention discloses a photovoltaic module output characteristic curve acquisition circuit, which will be described in detail below for its external wiring, internal circuit and control circuit.

[0042] On the external wiring of the photovoltaic module output characteristic curve acquisition circuit, its input terminal is connected to at least one photovoltaic module ( figure 1 Only one photovoltaic module i...

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Abstract

The invention discloses a photovoltaic module output characteristic curve obtaining circuit and method and a photovoltaic power generation system so as to diagnose the operating state of a photovoltaic module more comprehensively. On the external wiring of the circuit, the input end is connected with at least one photovoltaic module, and the output end is connected with the output end of another photovoltaic module output characteristic curve obtaining circuit in series. An internal circuit of the circuit comprises a first switch, a second switch, a first diode and a buffer circuit, wherein the buffer circuit is connected with the first switch in series and is then connected at the input end in parallel; the first diode is connected at the output end in an inverse-parallel mode; and the buffer circuit, the first switch and the second switch are connected in series and are then connected with the first diode in parallel. A control circuit of the circuit firstly controls the second switch to be switched off and then controls the first switch to be switched on in a control period, collects state parameters of at least one photovoltaic module in the control period so as to fit out an output characteristic curve of the at least one photovoltaic module, and then controls the first switch to be switched off and controls the second switch to be switched on.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, and more specifically, to a photovoltaic module output characteristic curve acquisition circuit, method and photovoltaic power generation system. Background technique [0002] In a photovoltaic power generation system, the output of a single photovoltaic module is often insufficient to provide the actual voltage and power requirements. Therefore, multiple photovoltaic modules need to be connected in series and parallel to form a whole to meet the design requirements. However, due to local shading, aging, potential-induced attenuation and other factors, the output characteristics of individual photovoltaic modules may be quite different from those of the whole. Then, serious mismatch losses will occur after series-parallel connection, which will affect the overall power generation. [0003] Therefore, it is necessary to obtain a relatively complete output characteristic curve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/10
CPCH02S50/10Y02E10/50
Inventor 俞雁飞倪华杨宗军
Owner SUNGROW POWER SUPPLY CO LTD
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