In view of the environmental problems of highway construction, people have been exploring how to combine road construction with environmental protection under the guidance of the theory of sustainable development, and then put forward the concept of ecological highway. Ecological highway is a combination of ecology and highway construction. Its development should follow the natural ecological laws and the development requirements of regional highways. Ecological highway lighting should of course also meet the requirements of ecological environment protection and energy saving and low carbon construction [1]. 1 Project background 1.1 Project Overview The project is located in the southern part of a resource-based city in northern China. The area was originally a coal mining subsidence area. It is a secondary sinking wetland with a total area of ​​2,000 hectares. It used to be in ruins and has a bad environment. After years of comprehensive management, it has now The city's central ecological park with unique northern garden landscape features will be built. The project name is the ecological park surrounding the lake ecological landscape highway. The project runs through the surrounding water bodies of the lake area and becomes an important basic project for the development of wetland ecotourism in the city. The project includes the main line around the lake and the various branch lines and connecting lines, with a total length of 33.7km and a total investment of 230 million yuan. In order to protect the integrity of the wetland ecosystem, the builders have shown extraordinary environmental concerns for the project. The project has adopted the goal of environmental protection and energy conservation by adopting advanced design and construction and ecological environmental protection technologies, realizing road construction and ecological environment protection and gardening. The effective coordination of the landscape not only achieves the construction orientation of “the road has a road, the road is the scenery, the integrationâ€, but also meets the strict requirements of engineering cost, construction period, quality and safety. The successful construction of the project is greatly supplemented. It enriches the design concept of ecological highways and becomes a model of environmental friendliness, resource conservation, and coordination of people, roads and environment. The project proposal was awarded the “2009 Third Prize of Excellent Engineering Consulting Achievements of Hebei Provinceâ€, and the construction drawing design won the “2009 Hebei Province Excellent Engineering Survey and Design First Prizeâ€. 1.2 Ecological Highway Lighting Requirements As we all know, the eco-road is based on the coordination of traffic development and environment, taking the natural virtuous cycle of the ecosystem as the basic principle, taking into account the whole process of decision-making, design, construction, operation and management, and integrating the environment within a certain area. A road system established with economic and social development. In order to create a good visual environment for visitors and ensure traffic safety, the project has set up functional lighting throughout the project. First of all, ecological highway lighting must meet functional requirements. All kinds of lighting equipment and energy-saving measures must meet the requirements of safe, reliable, scientific and reasonable, economical use and convenient maintenance. In actual work, according to the project scale and economic strength, it should be designed according to the standard and constructed according to the plan. It is necessary to ensure that the lighting system functions to achieve various technical indicators and energy-saving effects, and to prevent the pursuit of energy-saving at the expense of lighting effects [2]. Secondly, ecological highway lighting should pursue ecological energy conservation goals. At present, building a conservation-oriented society and a low-carbon economy has become an important national policy of China. The “Eleventh Five-Year Plan for Urban Green Lighting Project†issued by the Ministry of Construction requires annual energy saving targets of 5% for road lighting. In 2010, the total power saving should reach 25%, so power saving has become an important indicator of road lighting. Thirdly, road lighting energy conservation is not simply a matter of saving electricity. At the same time, it is necessary to use value engineering methods to consider investment cost, operation and maintenance, equipment management, and road lighting technical indicators, etc., when formulating power saving schemes and lighting design. solve. 2 Solar photovoltaic technology In today's increasingly scarce resources, solar energy is the most ideal clean energy and green energy in the new century. The use of photovoltaic power generation technology to convert solar energy into electrical energy can alleviate environmental pressure and achieve sustainable development, which is in line with the environmental protection and energy conservation requirements of ecological highways. Therefore, the project's functional lighting power source selects solar photovoltaic power generation. 2.1 Principle of power generation Solar photovoltaic power generation relies on solar cell components, utilizing the electronic properties of semiconductor materials. When sunlight is applied to the semiconductor PN junction, a strong built-in electrostatic field is generated due to the P-N junction barrier region, thus creating a barrier. Non-equilibrium electrons and holes in the region, or non-equilibrium electrons and holes that are generated outside the barrier region but diffused into the barrier region. Under the action of the built-in electrostatic field, each moves in the opposite direction and leaves the barrier region. As a result, the potential of the P region rises and the potential of the N region decreases, thereby generating voltage and current in the external circuit, and converting the light energy into electrical energy. 2.2 Solar independent power generation system Solar photovoltaic power generation systems can be broadly divided into two categories. One is a grid-connected power generation system, that is, connected to a utility grid through a standard interface, like a small power plant; the other is a stand-alone power generation system, that is, in its own The circuit is formed inside the closed circuit system and does not have a relationship with the external power grid [3]. The independent power generation system photovoltaic array first converts the received solar radiation energy into a power supply load, and the excess energy is stored in the battery in the form of chemical energy after passing through the charge controller. When the sunshine is insufficient, the energy stored in the battery passes through the full-bridge inverter and becomes SPWM wave, and then filtered and the power frequency transformer is boosted to become an AC 220V, 50Hz sinusoidal voltage for AC load.