What is MPPT technology in photovoltaic power generation?



In the photovoltaic power generation, the photovoltaic inverter is the core components of the entire photovoltaic power generation, and in the photovoltaic inverter MPPT PV inverter is a very core technology, then what is the MPPT in the end? We come together to know!

MPPT controller full name “maximum power point tracking” (Maximum Power Point Tracking) solar controller, is the traditional solar charge and discharge controller upgrade products. The MPPT controller can detect the generation voltage of the solar panel in real time and track the maximum voltage and current value (VI) to allow the system to charge the battery with maximum power output. Used in solar photovoltaic systems, coordination of solar panels, batteries, load work, is the photovoltaic system of the brain.
The maximum power point tracking system is an electrical system capable of outputting more power by adjusting the working state of the electrical module so that the direct current generated by the solar panel can be effectively stored in the battery, which can effectively solve the problem that the conventional power grid can not cover Of remote areas and tourism areas of living and industrial electricity, does not produce environmental pollution.
What is the role of MPPT?
As the solar cell received light intensity and environmental factors such as the impact of external factors, the output power is changing, the intensity of the power emitted by more, with MPPT maximum power tracking inverter is to make full use of solar cells, so that the operation At maximum power point. That is, in the case of the same solar radiation, MPPT after the output power will be higher than before MPPT, which is the role of MPPT.
The principle of maximum power point tracking
With the development of electronic technology, the current solar cell array MPPT control is generally through the DC / DC converter circuit to complete. The block diagram is shown in the following figure.
The photovoltaic cell array is connected to the load via a DC / DC circuit. The maximum power tracking device continuously detects the current and voltage variations of the PV array and adjusts the duty cycle of the PWM drive signal of the DC / DC converter according to its variation.
MPPT system block diagram
For a linear circuit, when the load resistance is equal to the internal resistance of the power supply, the power supply has the maximum power output. Although the photovoltaic cells and DC / DC converter circuits are strongly non-linear, but in a very short period of time, can be considered a linear circuit. Therefore, as long as the DC-DC conversion circuit to adjust the equivalent resistance so that it is always equal to the internal resistance of photovoltaic cells, you can achieve the maximum output of photovoltaic cells, also realized the photovoltaic cell MPPT.
This article is provided by Shenzhen Gurui Watt New Energy Co., Ltd. Shenzhen Gurui Watt New Energy Co., Ltd. was established in May 2010, is a professional to provide photovoltaic inverter, photovoltaic energy storage systems and user side intelligent energy management system solutions for the national high-tech enterprises.

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Post time: Jan-06-2018
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