In photovoltaic power generation, photovoltaic inverter is the core component of the whole photovoltaic power generation. In the photovoltaic inverter, MPPT is a very core technology of photovoltaic inverter. So what is MPPT? Let's get to know each other!
In photovoltaic power generation, photovoltaic inverter is the core component of the whole photovoltaic power generation. In the photovoltaic inverter, MPPT is a very core technology of photovoltaic inverter. So what is MPPT? Let's get to know each other!
The MPPT controller's full name "Maximum Power Point Tracking" solar controller is an upgraded product of the traditional solar charge and discharge controller. The MPPT controller detects the solar panel's generated voltage in real time and tracks the highest voltage and current value (VI), allowing the system to charge the battery with maximum power output. It is the brain of photovoltaic system used in solar photovoltaic systems to coordinate the work of solar panels, batteries and loads.
The maximum power point tracking system is an electric system capable of outputting more electric energy by adjusting the working state of the electric module, so that the direct current generated by the solar panel can be effectively stored in the storage battery, which can effectively solve the problem that the conventional power grid cannot cover. Living and industrial electricity in remote areas and tourist areas do not cause environmental pollution.
What is the role of MPPT?
Due to the influence of external factors such as light intensity and environment, the output power of solar cells is changed, and the power generated by light intensity is more. The inverter with MPPT maximum power tracking is to make full use of solar cells to make them run. At the maximum power point. That is to say, in the case of constant solar radiation, the output power after MPPT will be higher than that before MPPT, which is the role of MPPT.
Principle of maximum power point tracking
With the development of electronic technology, the MPPT control of current solar cell arrays is generally completed by a DC/DC conversion circuit. The schematic block diagram is shown below.
The photovoltaic cell array and the load are connected through a DC/DC circuit, and the maximum power tracking device continuously detects the current-voltage variation of the photovoltaic array, and adjusts the duty ratio of the PWM driving signal of the DC/DC converter according to the change thereof.
MPPT system block diagram
For linear circuits, when the load resistance is equal to the internal resistance of the power supply, the power supply has the maximum power output. Although photovoltaic cells and DC/DC converter circuits are strongly non-linear, they can be considered as linear circuits in a very short time. Therefore, as long as the equivalent resistance of the DC-DC conversion circuit is adjusted so that it is always equal to the internal resistance of the photovoltaic cell, the maximum output of the photovoltaic cell can be realized, and the MPPT of the photovoltaic cell is realized.
This article is provided by Shenzhen Guruiwatt New Energy Co., Ltd. Founded in May 2010, Shenzhen Guruiwatt New Energy Co., Ltd. is a national high-tech enterprise specializing in providing photovoltaic inverters, photovoltaic energy storage systems and user-side intelligent energy management system solutions.
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