Solar Street Light Energy Balance Method Based on Wireless Monitoring Cloud Platform
Abstract: Using ZIGBEE wireless communication automatic networking technology and GPRS remote wireless communication technology, using wireless monitoring platform to collect data of remote street lighting system, The data analysis process is finally applied to the working mode, and the working mode is sent to the solar street lamp system in an instruction manner, so that the street lamp works according to the predetermined mode.
The solar street light is a self-contained system that manages the charging and automatic switching of the street lights through its own control device. From the actual engineering experience analysis in recent years, although the solar power street lamp realizes automatic control and management of the whole power generation and power supply process, it reaches a certain level of intelligence. However, after the initial installation of the street lamp, it is not convenient to adjust the control mode during the operation. The control mode is maintained until the end of the street lamp operating life. Since the amount of electricity required to keep the solar street lamp running is derived from solar radiant energy, which is fluctuating every day throughout the year and difficult to predict, this results in the design of a solar street light system with a better sunshine in the traditional constant power supply control mode. The power generation is greater than the electricity consumption, resulting in waste of electrical energy; the actual power generation in the month of poor sunshine is less than the electricity consumption, causing the battery to be in a deficient state for a long time, and it is in a long-term, frequent deep discharge, resulting in serious damage and greatly shortened. The service life. Currently used solar street lamps, the largest investment cost, the highest maintenance and management costs, and the shortest life is the battery. In order to improve the service life of the battery, it is only guaranteed to be in a shallow cycle discharge state as much as possible, and the number of deep discharges is minimized. In order to achieve the above objectives, it is usually necessary to configure a larger capacity battery and photovoltaic modules, which increases the investment amount of the project and reduces the economic efficiency of the solar street lamp. Based on the above factors, in order to reduce system investment, extend the service life of the battery, and realize the humanized lighting function of the solar street lamp, it is necessary to find a balance between the system's power generation and power consumption, and ensure a scientific control method. Regardless of the daily sunshine situation, the power generation and power consumption of the street lamp system are basically in balance.
1 Wireless Remote Monitoring Platform Architecture
The wireless remote monitoring platform consists of a street light controller, a GPRS module, and monitoring software. Among them, the photovoltaic controller is the core component of the monitoring platform, and each street lamp is equipped with a street lamp controller. In addition to the conventional control function of the street lamp
system, the device also has a street lamp system. The basic acquisition data storage, storage and data transfer functions. At the same time, the street lamp controller also has the function of data mutual transmission and routing networking based on ZIGBEE communication mode, and finally realizes mutual visit with the remote PC monitoring software through the GPRS communication channel. Figure 1 shows the topology of the wireless remote monitoring platform. Figure 2 shows the monitoring software on the PC. Through the monitoring software, it can realize mutual visit and human-computer interaction with all the remote solar street lights.
2 Energy balance implementation method
The system implementation method is: forming a wireless data transmission channel based on the existing ZIGBEE wireless communication automatic routing network and GPRS remote wireless communication technology. Ensure that the various key parameters of each street lamp can be collected on the development of the monitoring cloud platform based on WINDOWS operating system, analyze and process, and judge the suitable working mode of the street lamp, and finally send the control command to all street lamps, let it Illuminate according to the agreed procedure.
The specific implementation steps are as follows.
(1) Through the wireless communication network built by ZIGBEE and GPRS, collect the day-to-day power generation, the first night power consumption, and the highest battery of the day in all the road lamps in a project based on the monitoring platform of WINDOWS operating system. The voltage, the maximum voltage occurrence time of the battery on the same day, the time when the charging starts on the same day, the time when the battery is charged and recharged, the time of turning on the day, and the time of turning off the day.
(2) After the monitoring cloud platform completes the work of step 1, the acquired data is analyzed and processed. If the total number of street lights for obtaining data is N, the average data of the N street lamps are averaged, and finally: the average value of the day-to-day power generation of all street lamps, the average QL of the first night power consumption, and the current day. The average value of the battery's highest voltage BV, the average value of the battery's highest voltage occurrence time TB, the average value of the day when the charge starts to occur, the average value of the day when the battery is charged and floated, and the average of the daylighting time. T3, the average value of the day off time T4. And, QV minus QL to get the rich power QF on the day; T2 minus T1 to get the strong charge and equal charge duration TQ on the day, T3 minus T1 to get the total charge time TC on the day, T4 minus T3 to get the total night illumination Time TY.
(3) According to the analysis result, the illumination time TT of the night is output.
1 If QF<0, then="" tt="TY-1," tt="" must="" be="" at="" least="" 4h="" (provided="" that="" the="" battery="" is="" not="" below="" the="" undervoltage="" protection="" cut-off="" point).="">
2 If QF ≥ 0, and TQ < tc/2,="" then="" tt="TY" +="" 1,="" tt="" maximum="" does="" not="" exceed="" the="" total="" length="" of="" the="" first="" night.="">
3 If QF ≥ 0, and TQ ≥ TC/2, then TT = TY.
(4) The illumination time TT obtained in step 3 of the night, if TT ≤ 4h or TT ≥ the total length of the night time of the first day, then the illumination of each lamp is fully illuminated in the evening; if TT>4h and TT< the="" total="" length="" of="" the="" first="" night="" is="" the="" same.="" when="" all="" the="" street="" lights="" are="" turned="" on="" from="" the="" day="" to="" the="" 4th="" hour,="" the="" interval="" is="" half="" an="" hour.="" the="" number="" is="" an="" odd="" number="" of="" street="" lights="" to="" start="" the="" first="" half="" hour="" of="" illumination="" and="" the="" second="" half="" is="" off.="" for="" the="" even-numbered="" street="" lights,="" the="" second="" half="" hour="" of="" illumination="" is="" activated="" every="" hour,="" and="" the="" first="" half="" hour="" is="" extinguished.="" in="" this="" way,="" the="" whole="" street="" lamp="" is="" alternately="" arranged="" at="" intervals="" of="" half="" an="" hour="" in="" the="" middle="" of="" the="" night,="" and="" the="" lighting="" is="" alternately="" arranged="" at="" intervals,="" that="" is,="" the="" road="" lighting="" requirement="" is="" ensured,="" and="" the="" electric="" energy="" is="" saved.="">
3 Conclusion
Create a monitoring cloud platform, collect and analyze the day's power generation and head-night power consumption of a street lamp in a street lamp unit. The highest voltage of the battery on the same day, the highest voltage occurrence time of the battery on the same day, the charging start time on the same day, the time when the battery is charged and recharged, the time of turning on the day, the time of turning off the light on the day, based on the above data, analyze and judge the operation of the street lamp system. Condition, according to the predetermined control strategy, to achieve appropriate adjustment of the lighting power and time of the street lighting source.
