Shulou(Shulou.com)11/24 Report--

CTOnews.com, December 22 (Xinhua) Photovoltaic power generation is a technology that uses the photovoltaic effect of the semiconductor interface to directly convert light energy into electricity. It is mainly composed of solar panel (module), controller and inverter. Due to the continuous change of solar light intensity, the actual utilization rate is limited. In order to achieve the maximum power output of the photovoltaic inverter and meet the demand of the maximum output power, in order to improve the charging efficiency, it is necessary for the controller to accurately control the power.

At present, the traditional PWM controller is widely used in the market, its structure is relatively simple, and can not achieve real-time tracking, the improvement of charging efficiency is small, while the MPPT controller can real-time track the maximum power point of solar panels, and give full play to its maximum effect, which can directly improve the power generation of photovoltaic system, so it will become the development direction of solar controller.

Guangdong Yuefang Technology integrates RISC-V open source processor architecture, ABC data security architecture and AIoT computing technology to develop a new generation of BF2-MPPT solar controller. Based on the advantages of the incremental conductance method, this scheme improves the hardware design, optimizes the algorithm efficiency, and relies on the arithmetic power of the BF2 chip to change the hardware requirements of the traditional incremental conductance method, especially the high precision of the sensor and the high cost of the whole system. A more accurate incremental conductance algorithm is realized on the basis of low cost.

MPPT, short for Maximum Power Point Tracking, is translated into Chinese as "maximum power point tracking". Photovoltaic module is a kind of nonlinear DC power supply, and its output maximum power point varies with the change of light and temperature. Under certain sunshine intensity and temperature environment, photovoltaic can work at different output voltages, and the photovoltaic output power can only reach the maximum value at a certain voltage. Then the photovoltaic operating point reaches the highest point of the output power-voltage curve, which is called maximum power point (MPP). In the photovoltaic system, in order to improve the overall efficiency, it is necessary to adjust the photovoltaic operating point in real time so that it can always work at the maximum power point attachment, which is called maximum power point tracking (MPPT).

For example, suppose MPPT hasn't started tracking, then the component output voltage is 500V, and then after MPPT starts tracking, it starts to adjust the resistance on the circuit through the internal circuit structure to change the component output voltage, and at the same time change the output current until the output power is maximum (assuming 550V maximum), and then keep tracking, that is to say, when the solar radiation is constant. When the output voltage of the module is 550V, the output power will be higher than that of 500V, which is the function of MPPT.

1 Application direction > >

BF2-MPPT solar controller can be used in photovoltaic power generation scenes such as solar power generation systems, solar street lamps, solar charging piles, solar billboards, solar smart homes, solar traffic warning lights and so on.

BF2, the core device of Yuefang technology solution, is a 32-bit RISC-V architecture SoC (system-on-chip), integrated dual-mode Wi-Fi / BLE, with its own security encryption function, which can be applied to smart energy, smart logistics, smart city, smart factory and other fields.

2 Product characteristics > >

● MCU control + WiFi integrated chip

● can be controlled remotely via App or Mini Program

● IoT real-time monitoring, historical data monitoring, according to cloud intelligent algorithm to guide users to operate reasonably according to real-time situation.

● high chip computing power, can support complex incremental conductance algorithm, more accurate and stable

● chip can support block chain technology, through end-to-side data winding to ensure the reliability of photovoltaic data.

3 functional Overview > >

The MPPT charging control scheme based on BF2 can achieve higher peak power tracking and maintain photovoltaic stability near the maximum power point for a long time. CTOnews.com learned that through a more accurate and efficient incremental conductance control algorithm, when the light and temperature change, the output voltage of the solar array can smoothly follow the change of the environment, so that the solar photovoltaic array finally stabilizes at a certain point near the maximum power point, rather than jumping back and forth, the voltage fluctuation is smaller than the disturbance observation method, the control is accurate, and the response speed is faster.

Yuefang Technology said that this scheme can simultaneously achieve the IoT function, can connect to the cloud through Wi-Fi, and carry out remote inspection and control through App. At the same time, it can guide users to operate reasonably according to the real-time situation according to the cloud intelligent algorithm. Block chain technology is used to ensure the reliability and security of photovoltaic working data, which provides data guarantee for photovoltaic power supply scenarios.

4 Product advantages > >

● low cost

At present, the disadvantages of the products in the market are as follows: the cost is high, the control operation of the display screen and App is repeated, and the MCU only increases the cost, which requires external BLE / Wi-Fi, which increases the cost.

BF2-MPPT low-cost advantage: directly through App or Mini Program online remote control, you can save LCD screens and keys and other costs. BF2 can carry MCU function and comes with Wi-Fi / BLE, which can reduce the cost by about 30% and 40%.

● IoT function

Realize IoT function through WiFi / BLE

The running status of the equipment can be monitored remotely through App or Mini Program and controlled remotely.

It can accurately record and collect the power of photovoltaic cells, store historical data, and make it easy to trace the source of the problem.

It can guide users to operate reasonably according to the real-time situation according to the cloud intelligent algorithm.

Ensuring the reliability and security of photovoltaic data through block chain technology

Support other Internet of things access, open API interface.

Green energy measurement of ● block chain

In the process of photovoltaic power generation, the energy storage data of photovoltaic power generation are collected and counted to assist EMS to measure green energy.

In the working process, the collected photovoltaic equipment data can be encrypted in many ways by relying on the high computing power of the BF2 chip, and the end-to-side block chain of the data can be realized at the same time.

To ensure that the data can be traced back to the source and ensure the authenticity of the data, so as to find the cause of problems in the process of measurement in time and ensure stable power generation.

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