Henan Expressway Monitoring System solar serve multiple purposes

Henan Expressway Monitoring System solar serve multiple purposes




Henan Expressway Development Co., Ltd. using solar photovoltaic technology, successfully implemented at the company Huo highway full of solar-powered video surveillance system demonstration project, in order to monitor the power grid to solve highway construction costs are high, line loss of large, energy low utilization rate of the issue to explore a new way. After nearly five years of actual operation to prove that the model engineering and technical programs mature, reliable, when compared with the power supply, power supply and distribution projects can save construction investment 58.3%, with an average savings of 31.3 thousand yuan per kilometer; five years to save electricity 220,000 Yuan, gasoline cost, 960,000 yuan to reduce the 402 tons of carbon dioxide emissions, the effect significant.



It is understood that, with the Henan highway road network gradually formed, in order to develop and implement contingency plans to reduce traffic congestion, prevent accidents, improve service levels, Henan Expressway Development Co., the company decided at the company (Yun Hong Kong) Fok (Er fruit Sri Lanka) highways under the jurisdiction of Zhengzhou and Luoyang, 220 kilometers of road within the framework of the implementation of process monitoring.



In order to expand the scope to monitor the effective implementation of process monitoring, field camera set interval of about 2 km, in a non-centralized linear layout, the use of a grid power supply, there are line losses large, high cost of construction investment, construction and complex high maintenance costs and operating problems. Meanwhile, the road section to be implemented without interrupting operation on both sides of the road widening works (4 changed 8), field cameras to be installed in the central isolation belt. As in the central isolation belt laying power cable, then the impact of communications and other weak signal. Therefore, the camera power supply issue has become the project implementation unit facing difficult problems.



Solar energy is an inexhaustible clean environmentally friendly energy sources, the use of solar photovoltaic technology to convert solar energy into electrical energy, has been widely used in aerospace, weather stations, telemetry, remote sensing, channel lighthouse, railway signals, communication and remote areas, island residents in the power supply and other fields. Solar photovoltaic technology to provide a solution to these problems. And in the Henan Province, Zheng Luo Road, Central, located at latitude 34.7 degrees year round sunshine 2000-2600 hours, an average annual sunshine rate of 45% to 55%, the total annual solar radiation, 110-125 kcal / square cm, along the daily average irradiation time is about 4.1 hours, belongs to three regions in the solar energy resources, solar energy resource rich region. Therefore, Cheng Luo Lu full realization of solar energy has good natural conditions for monitoring. Thus, according to Zheng Luo Lu entire monitor actual needs, from an economic, energy saving, environmental protection, and shorten the duration of the point of view, even Huo Zhengzhou to Luoyang expressway section of the road monitoring system of using solar energy power supply for the full range of 100 sets of video surveillance cameras for the electricity.



Optimization of key equipment to improve power generation efficiency



Solar-powered highway monitoring system is composed of full solar array, battery, solar energy charge and discharge controller, inverter, transformer, devices such as cameras and Optical component. Solar photovoltaic power generation systems are components of the sunlight through the solar radiation produces photovoltaic current electricity load for the supply of electrical energy. Solar cells generate an electrical current through the charge and discharge controller, the load on one hand, the direct power supply, the other hand, the excess energy stored in batteries to prepare for light is insufficient power to the load. AC load through power inverter transformer to convert AC power applied. In response to adverse weather conditions caused by insufficient battery power, the system can be configured or self-generating electricity emergency charging interface. In order to improve the reliability of power supply system, through the Optical PV systems will be uploaded to the operational status of real-time monitoring center in order to take timely manual maintenance measures.



Solar photovoltaic technology in road transport sector is the main obstacle to the application of the applicability of the load power supply problems, how to combine the highway full load characteristics of electricity monitoring system, optimizing the power supply system design, reduce electricity load power consumption, improve the efficiency of solar power generation system is the key technology aspects of the project. Therefore, the project components are as follows for the system is mainly optimized.



Camera: solar power system to reduce the initial investment cost, traffic monitoring image quality to meet the requirements of the premise, after testing and research on electric power of the camera to make specific requests and technical improvements will bring the work of one all-weather cameras Rated power limited to 30 watts or less, and using 24-volt DC power supply.



Power conversion system: In order to meet the load of the DC power supply model, video surveillance system, power loads series of technological innovation, will replace the majority of AC load DC load. Through technical transformation, saving inverter and transformer equipment investment, reducing the risk of failure of the power system, reducing its own inverter and transformer power loss and improve power system solar power system reliability and the use of rate, but also reduces the power supply system to the solar cell array and battery capacity requirements, thus further reducing construction costs, and increase economic efficiency.



Solar panels: Solar panels are solar-powered system, the key equipment, the installation angle of a greater impact on power generation efficiency and minimize the level of the installation or vertical placement. The pilot, the project is the best solar panels installed with an inclination of 41.7 degrees, towards the due south. In the solar power system, the silicon-based photoelectric conversion efficiency of the battery is superior to polysilicon and amorphous silicon, although the non-monocrystalline silicon solar panel under special conditions can be used as supplementary power supply applications, but considering the low capacity of its power supply the aging characteristics of speed, the project selected monocrystalline solar panels.



Battery: Using the electrochemical reaction to achieve the mutual power and chemical energy conversion, solar power supply system in the energy storage device. Its main technical indicators such as capacity, cycle life and float life, etc.; the main control parameters include the discharge depth, float voltage, maximum charge and discharge current. Comprehensive consideration of the characteristics of various types of batteries, combined with cost analysis, the project is selected maintenance-free gel-type lead-acid batteries. Temperature on the obvious impact on the performance of lead-acid batteries, lead-acid batteries should be in the outdoor temperature processing, engineering usually batteries placed on the ground wells or ground-based buildings. Through this project a variety of experimental methods to fully verify the impact of temperature on battery performance will be placed in thermal protection, battery boxes and buried in the permafrost below, ensure the battery best working condition. Run five years, after sampling, battery good working order.



Solar charge and discharge control: In order to achieve solar cells, batteries, and a reasonable match between the load to protect the power supply quality, increase solar power system efficiency and extend battery life. The project selected 12,24,48 VDC adaptive 20A solar charge and discharge controller, set-off discharge voltage 21.6VDC, to ensure that extreme weather conditions, reliable power supply. And configure the data acquisition module, the battery voltage, charge current, discharge current parameters such as real-time uploaded to the monitor center power management system.



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