Solar power generation real-time monitoring system
Renewable energy solar power can be divided into solar power (also called photovoltaic) and solar thermal power generation two categories, the latter more complex as technology can only be used for larger capacity, has limited application, so the practical application of the present less. Solar power is inexhaustible, pollution-free and many other advantages, has become a hot human quest for new energy. But there is also applied intermittently, power generation and climate-related shortcomings. Therefore, to improve the efficiency of solar cells, power generation real-time monitoring is necessary, you can work in the early detection of solar cells appear abnormal. Here presents a real-time monitoring of solar cell power generation system design. System using AT89S52 MCU, using current sensor on the solar cell’s output current measurement, the advantage is almost no energy in case, to measure current into voltage.
1 System hardware design
Hardware circuit shown in Figure 1, mainly by the solar cell group, consisting of Hall current sensors, I / U conversion circuit, liquid crystal display device composed 1602, AT89S52 chip microprocessor control system, and the composition of lead-acid battery energy storage System 5 parts. Course of their work: when the solar cell receiving light to produce current, the battery charging, MCU through the regulator device provided by the battery voltage, the electricity generated from solar cells on the real-time signal acquisition. As the MCU can only receive the voltage signal, so before receiving the signal from the I / U, U / U conversion module will signal transferred to the appropriate voltage. The internal operation, resulting in delivery device 1602 LCD display the battery capacity.
2 System Software
System Software primarily completed by the microcontroller, data acquisition and control of the main display, the software system design is modular thinking, its measurement and display the program flow shown in Figure 2.
3 System Test and Analysis
To 200 W of the small off-grid photovoltaic systems, for example, the rated voltage of 24 V, maximum current of 6.18 A, battery 200 Ah. Design of the normal discharge time for the 2 ~ 3 d, 0 ~ 6.18 A proportion of current is converted to 0 ~ 5 V voltage, resistance posed by the two attenuator, the output voltage amplification ratio of the resistors R1 and R2, the ratio of the decision , set U / U conversion ratio of 5 / 24, then R7 = 10 kΩ, R6 + Rp2 = 48 kΩ. Depending on the charge formula Q = UIT, test time is 12 noon to 2 pm, starting from the display power consumption, recorded once every 3 min and monitoring the actual power of the data shown by the system, the second error of less than 3%, table l 10 are given the initial measurement error situation, with the power increases, the error range is gradually shrinking.
Renewable energy solar power solar power generation can be divided into two (or PV) and solar thermal power generation two categories, the latter technique Bijiaofuza You Yu, Zhi Neng relatively large for the capacities, applications subject to certain Xian Zhi, Suo Yi Muqianshiji application less. Solar power is inexhaustible, pollution-free and many other advantages, has become a hot human quest for new energy. But there is also applied intermittently, power generation and climate-related shortcomings. Therefore, to improve the efficiency of solar cells, power generation real-time monitoring is necessary, you can work in the early detection of solar cells appear abnormal. Here presents a real-time monitoring of solar cell power generation system design. System using AT89S52 MCU, using current sensor on the solar cell’s output current measurement, the advantage is almost no energy in case, to measure current into voltage.
4 Conclusion
The AT89S52 microcontroller, Hall current sensors and liquid crystal composition 1602 solar power generation, real-time monitoring system is simple, low cost, maintenance-free, small power consumption and effective real-time monitoring of solar cell power generation, early detection of solar cells anomalies arising in the work. The system is designed as a photovoltaic system accessories for small off-grid photovoltaic systems, and components of the system, longer life, durable and reliable, so in the off-grid PV system has wide application.
