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

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...

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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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