Maximum power point tracking controller of photovoltaic assembly and photovoltaic assembly system

A technology of maximum power point and tracking controller, which is applied in the direction of using feedback control, photovoltaic power generation, photovoltaic modules, etc., can solve the problems of tracking method failure and inability to complete maximum power point tracking, etc., and achieve the effect of improving power generation efficiency

Inactive Publication Date: 2012-07-04
CSI SOLAR POWER GROUP CO LTD +1
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  • Abstract
  • Description
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Problems solved by technology

[0018]2. There is only one extreme point in the I-U curve, which is the maximum power point;
The shape of the curve may change greatly, and the curve may produce two or more extreme points. In this case, the above tracking method cannot complete the tracking of the maximum power point, but can only track the power point close to the system. The extreme point of the maximum power point before the state change, and this extreme point is not necessarily the maximum power point on the I-U curve with multiple extreme points, so the above tracking method may fail

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  • Maximum power point tracking controller of photovoltaic assembly and photovoltaic assembly system
  • Maximum power point tracking controller of photovoltaic assembly and photovoltaic assembly system
  • Maximum power point tracking controller of photovoltaic assembly and photovoltaic assembly system

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Embodiment Construction

[0037] like figure 1 , which shows the characteristic curve of the PV module, from figure 1 It can be seen from the figure that the volt-ampere I / U characteristic curve of photovoltaic modules has strong nonlinearity. It is neither a constant voltage source nor a constant current source, and it is impossible to provide arbitrarily large power P for the load. It is a nonlinear For DC power supplies, the output current is approximately constant in most operating voltage ranges, and the current drop rate is very large when it is close to the open circuit voltage. A photovoltaic module has an open circuit voltage value Uoc and a short circuit current value Isc. The photovoltaic module theoretically has a maximum power point power value Pm, which corresponds to a maximum power point voltage value Um and a maximum power point current value Im.

[0038] like figure 2 , which shows the I-U characteristic curves of photovoltaic modules under different light intensities at a tempera...

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Abstract

The invention discloses a maximum power point tracking controller of a photovoltaic assembly and a photovoltaic assembly system with the maximum power point tracking controller. The maximum power point tracking controller comprises a signal collection part used for collecting voltage signals and current signals, an analog-to-digital converter (ADC) used for converting analog signals to digital signals, a micro controller unit (MCU) (23), a switching tube and a direct current to direct current (DC-DC) network. The maximum power point tracking controller can lead the photovoltaic assembly system with the controller to accurately, timely and effectively track a maximum power point, and improves power generation efficiency of the photovoltaic assembly.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a maximum power point tracking controller of a photovoltaic module and a photovoltaic module system using the controller. Background technique [0002] In photovoltaic modules, due to changes in environmental conditions (radiation intensity, module temperature, ambient temperature, shadow shading, hot spots, etc.), the working status of photovoltaic modules is also changing at any time. To obtain the maximum power output of the array or module to the load , the maximum power point tracking (Maximum Power Point Tracking, referred to as MPPT) must be carried out on the photovoltaic module under real-time state conditions. [0003] The essence of MPPT control is a dynamic optimization process. By detecting the current output voltage and current of the photovoltaic module, the current output power of the photovoltaic module is obtained, compared with the power a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N6/00G05D3/12H02S40/30
CPCY02E10/50
Inventor 闫广川
Owner CSI SOLAR POWER GROUP CO LTD
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