1 Introduction to wind energy and solar energy and broad prospects With the worldwide outbreak of one-off energy crisis such as oil, coal and natural gas, the development and application of clean, environmentally friendly and free renewable energy such as solar energy and wind energy have received increasing attention. Solar energy and wind energy are inexhaustible resources that nature can give to human beings. Solar energy is the source of all energy on Earth. Wind energy is another manifestation of solar energy on the surface of the earth. Because the different forms of the earth's surface (such as sand surface, vegetation ground and water surface) have different heat absorption coefficients to the sun's light, a temperature difference is formed on the surface of the earth, and the temperature of the surface air is different. Air convection produces wind energy. When the sun is strongest during the day, the wind is very small. After the sun sets in the evening, the light is very weak, but the wind energy is strengthened due to the large temperature difference of the surface. In summer, the intensity of the sun is large and the wind is small. In winter, the intensity of the sun is weak and the wind is strong. Therefore, solar energy and wind energy are highly complementary in time and geography. The complementary time of solar energy and wind energy makes the wind-solar hybrid power generation system have the best matching in resources. The wind-solar hybrid power generation system is the independent independent power supply system with the best resource conditions. Street lighting is an important part of urban public facilities, and it not only brings light to people's lives. You can also decorate the night of a city with a lot of colors. But at the same time, it is also a big power consumer. With the progress of society and the development of the city, the quality of road lighting has also been greatly improved, which makes it the most energy-consuming urban public facility. How to further improve the quality of street lighting under the premise of saving energy and protecting the environment is an important issue in the development of China's cities. The emergence and development of wind-solar complementary street lamps highlights the development direction of energy-saving and environmentally-friendly industrial society in the 21st century. The construction of scenery and complementary street lamps is not only in line with the government's concept of protecting the environment, conserving resources, and recycling economy, but also providing students with an intuitive education on new energy utilization and ecological environmental protection knowledge. Scenery and complementary street lamps have a very positive significance for beautifying and protecting the environment and building a harmonious society. Conventional street lamps require the construction of substations and are powered by buried cables, and require frequent maintenance and management, so construction costs are high. The wind-solar complementary street lamp does not need transmission lines, does not consume grid power, and can provide stable and reliable energy by using inexhaustible wind energy and solar energy once and for all after a one-time investment in construction costs equivalent to conventional street lamps. It can be seen that the complementary street lamps have obvious social and economic benefits that traditional street lamps cannot match. 2 Principles and characteristics of scenery complementary street lamps The photovoltaic system is a system that uses photovoltaic panels to convert solar energy into electrical energy, then charges the battery through the controller, and finally supplies power to the electrical load through the inverter. Its advantages are high system reliability, low operating and maintenance costs, and the disadvantage is that the system is costly. A wind power system is a system that uses small wind turbines to convert wind energy into electrical energy, then charges the battery through a controller, and finally powers the electrical load through the inverter. Its advantage is that the system generates a large amount of electricity per day, the system cost is low, and the operation and maintenance cost is low. The disadvantage is that the reliability design of the small wind turbine has not been solved. Due to the strong complementarity between solar energy and wind energy, the wind-solar hybrid power generation system compensates for the shortcomings in the resources of wind power and photovoltaic independent systems. At the same time, wind power and photovoltaic systems can be used in battery packs and inverters. Therefore, the cost of wind-solar hybrid power generation system is lower than that of separate photovoltaic systems and wind power systems, and the construction and maintenance costs of the system tend to be reasonable. The wind-solar hybrid power generation system can reasonably configure the system capacity according to the user's power load condition and resource conditions, which can ensure the reliability of the system power supply and reduce the cost of the power generation system. No matter what kind of environment and what kind of electricity requirements, wind and solar hybrid power generation systems can make optimal system design solutions to meet user requirements. It should be said that the wind-solar hybrid power generation system is the most reasonable independent power system. Compared with traditional street lamps, wind-solar complementary street lamps do not need to consume grid power, which saves the construction and maintenance costs of substations and power distribution lines. Compared with street lamps powered solely by solar energy, wind-solar complementary street lights also have significant advantages: (1) The full utilization of wind energy not only greatly increases the energy conversion rate, but also significantly reduces the cost of solar system equipment. (2) The improvement of energy efficiency makes the wind-solar complementary street lamp more flexible in light source configuration. Basically, the light source used in the traditional street lamps can be applied to the wind and solar complementary street lamp system. 3 Feasibility of wind-solar complementary street lamps in practical applications Located in the northern part of the Pearl River Delta, Guangzhou is bordered by the South China Sea and is located in the subtropical zone. It is a marine monsoon climate. More northerly winds in winter; more southeast winds in spring, summer and autumn. The annual average wind speed is 1.9m/s. 1 Analysis and comparison of performance, maintenance and cost of wind-solar complementary street lamps, solar street lamps and traditional street lamps Guangzhou International Biological Island is located in the southeastern part of downtown Guangzhou. It is an elliptical island with a northeast-southwest direction. The long axis is about 2.8Km and the width is 0.9Km. The surrounding coastline is 6.8Km long and the area is 1.83Km2. The planning of Guangzhou International Bio Island specifically proposes to follow the principles of sustainable development. Adopting the concept of green planning with high harmony between natural environment and artificial environment, urban construction and ecological protection; emphasis on development while emphasizing sustainability. The future Guangzhou International Biological Island will become a demonstration zone for implementing the city's sustainable development strategy. According to the "Guangzhou International Biological Island Controlled Detailed Planning", the island is 7Km long and the 26m wide roundabout is a two-way four-lane landscape urban secondary road. Combine the climate characteristics of Guangzhou and the actual conditions of the project. The section selected is the experimental application section of the wind and solar complementary streetlight scheme. Huandao Road is a landscape road that surrounds the biological island, and the riverside green park forms a living leisure belt around the island. Therefore, the section has the favorable conditions for implementing the wind-solar complementary streetlight system: First, the road around the island is at the periphery of the biological island. At the same time, because of the landscape, the surrounding terrain is relatively wide, no matter whether the sun or the wind is affected by the tall buildings. The second is also because of the design and orientation of the scenic urban secondary roads around the island, which highlights its landscape function and weakens the traffic function. This relatively weakens the problem of low power supply in the "Wind and Light Complementary Street Light System". In the same way, according to the road landscape requirements, the design can consider the use of LED lights, energy-saving lamps and other low-power light sources to replace the traditional high and low-pressure sodium sources. To completely overcome the shortcomings of the complementary street lighting system. At present, some cities in China have experimentally used the scenery street lighting system as the urban road landscape lighting, and achieved certain results. As the largest city in the south of China, Guangzhou should be at the forefront of high-tech and energy-saving and environmental protection. 4 Conclusion As a brand new municipal facility, the street lighting system is constantly recognized and recognized by people. Its application represents a certain achievement in the development and use of environmentally friendly energy. As technology matures, it will not only create huge benefits for the society, but also bring broader prospects for the large-scale application and development of environmentally friendly energy.
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