Energy is the basis of economic and social development. With the sustained and rapid development of new energy development and utilization, the energy structure presents a diversified trend. Electric energy is a clean secondary energy, and the power grid is a green platform for power transmission, resource allocation and customer service. In view of the reverse distribution of energy and demand, in order to solve the energy shortage of the load center in the East and middle and reduce the pressure of environmental pollution, it is necessary to implement the transformation of development strategy and optimize the high-voltage power grid, so as to optimize the energy allocation in a wider range and ensure the reliable supply of electricity. Focus on electricity, gather positive energy of green energy, meet customers' diversified power demand, and provide solid energy supply guarantee for economic and social development.

In order to realize the harmonious development of power grid construction and ecological environment and integrate the silver line of iron tower with green mountains and green water, it is necessary to change the traditional design concept, innovate environmental protection design, explore environmental protection construction scheme and reduce the impact on the ecological environment in the planning, design and construction of power grid. The development of UHV power grid can realize the transformation of energy development and transportation mode, which can scientifically arrange the points of thermal power plants and change coal transportation into power transmission. Electricity comes from afar, realizes the substitution of electricity, and improves the proportion of electricity in terminal consumption, which not only meets the energy demand of load center, but also reduces the pollution pressure in economically developed areas, so as to improve a new path for controlling smog.

1、 Role of power grid in energy supply guarantee system

Energy is the basis of economic and social development. The sustainable development of energy is related to the overall strategic situation of national economic development. However, the contradiction between the distribution and supply of energy resources, consumption and environmental protection is becoming increasingly prominent. Energy development is facing the severe situation of tighter resource constraints, serious environmental pollution and ecosystem degradation. In order to meet the needs of rapid economic and social development, we must accelerate the transformation of energy development strategy and ensure the reliable supply of energy. We need to coordinate the coordinated development of energy and ecological environment, promote the transformation of energy structure from high carbon to low carbon, the transformation of energy utilization from extensive to intensive, and the transformation of energy services from one-way supply to intelligent interaction. Build a reliable and clean modern energy supply guarantee system, and the power grid plays an important role in the supply guarantee system.

With the sustained and rapid development of new energy development and utilization, the energy structure presents a diversified trend, while electricity is a clean secondary energy, and the power grid is a green platform for power transmission, resource allocation and customer service. Only relying on a strong and large power grid can we build a safe supply system with optimized energy allocation and adapt to the rapid economic development. At the same time, only by developing a strong smart grid can we promote the large-scale development of energy bases and effectively solve the randomness and intermittent power grid connection problems of wind and solar power generation, so as to improve the grid connection and consumption capacity of clean energy power, effectively prevent and control air pollution and protect the environment.

Under the situation of rapid and sustainable economic and social development, energy demand still maintains a rapid growth trend. Only by accelerating the strategic transformation of energy development mode and realizing the cleanness of energy development, can it be conducive to the construction of comprehensive energy transportation system, build an energy supply guarantee system with coordinated AC and DC development and reasonable structural layout, and focus on electricity to aggregate green energy and positive energy, Ensure the reliable supply of power resources. Therefore, only by developing a strong smart grid with UHV power grid as the backbone and intelligence as the core, can we promote the implementation of large-scale "west to East power transmission" and "north to South Power Transmission" projects. So that it can realize the optimal allocation of power resources in a wider range and change the development mode of local consumption balance of power, so as to achieve the interconnected and interactive supply of large power grids and transmit rich clean energy to the load center in the East and middle, which can not only meet the diversified power demand of customers, but also reduce the pressure of environmental pollution in economically developed areas. In the environment of optimizing the energy structure, only by giving full play to the guarantee role of the power grid in the energy supply system can we promote the diversified and sustainable development of new energy and provide power support for economic and social development.

2、 Optimize the construction scheme of power grid construction and protect the ecological environment

With the "west to East power transmission" project and the rapid growth of power load, the power grid is also expanding. The power grid is placed in nature, and the power grid construction must face the ecological environment. If the ecological environment is damaged, the recovery is extremely slow or even irreversible. Then, in the construction of power grid construction projects, how to protect the ecological environment and make the power grid and ecology coexist harmoniously is the topic that power grid builders explore.

In order to reduce the impact of power grid construction on the ecological environment to a low degree, firstly, in the planning and design stage of power grid project feasibility study, it is necessary to establish the design concept of protecting the ecological environment, innovate the environmental protection design, and reduce the ecological damage caused by power grid construction to a low degree. Following the traditional design concept, the power grid line generally takes a straight line, and the line must take a straight line. It may pass through the forest area, and trees must be cut down in the stringing, which is not only difficult to solve the contradiction with the interests of forest farmers, but also has an impact on the ecological environment. In order to protect the ecological environment and not destroy every plant and tree, the route path can be taken around along the road direction in the design, which can avoid the damage of the line to the trees and protect the ecological environment. Therefore, only by innovating environmental protection design and construction can we leave almost no construction traces on the construction site and see only brand-new iron towers standing one by one.

The route of the power grid line is to pass through high and steep mountains. The road leading to the construction site is a mountain path. The materials of the tower foundation and tower cannot be transported by machinery. If the mechanical channel is to be excavated, it will have an impact on the ecological environment. In order to protect the ecological environment, power grid construction employees love every plant and tree like their own eyes. Through the investigation of the construction site, combined with the construction period, progress, carrying capacity and other factors, the environmental construction scheme is determined. For the transportation of construction materials, the transportation scheme combining horses and Cableways is adopted. The materials and tower materials required for the tower foundation are carried by mules and horses and carried manually to carry the required construction materials up the mountain. In case of high mountains and steep slopes, high mountains and dangerous roads, and some can't even get on mules and horses, Cableways can be set up to transport infrastructure materials and tower materials to the land. The use of flexible horse transportation can effectively solve the transportation problem of steep mountains, and the setting of cableway has large carrying capacity, which is also a good way for large-scale material transportation. The construction practice shows that these transportation methods can not only avoid the impact on the ecological environment, but also hardly leave traces on the construction site and reduce the impact on the ecological environment to a low degree.

If the power grid line passes through the plain grassland, the construction conditions will be greatly improved, but the awareness of environmental protection construction cannot be less. Grassland is the lifeblood of herdsmen's life for generations. During construction, it is also necessary to protect grassland vegetation like taking care of your own eyes. The foundation excavation and watering of the tower foundation will also damage the grassland. The power grid builders still try their best to brainstorm and explore the environmental protection construction scheme. The construction site shall be isolated from the grassland and quarry, and the construction site shall be free from damage to the vegetation. When large machinery enters the site, in order to reduce the rolling of grassland, try to walk along the original road. Although it is necessary to walk more, it can reduce the damage caused by rolling of grassland. If there is no road to go, grass mat can be used to lay the access road to reduce the impact of machinery on the grassland.

In addition, during the tower foundation construction in the grassland, the turf at the pit mouth of the tower foundation shall be cut into blocks of appropriate size before the tower foundation excavation, and moved to the adjacent open space for careful watering and maintenance. After the tower foundation is poured and the tower is erected, the turf shall be moved back to its original ecological appearance. In the power grid construction, only the concept of environmental protection construction can be run through the whole process of the project. Whether it is flat or high mountains and steep slopes, what we see is only the cement tower pier and grounding wire supporting the iron tower, while almost no more excavation and rolling traces are left on the construction site, so as to integrate the iron tower with the environment and realize the harmonious coexistence of power grid and ecology.

3、 Building UHV power grid to provide support for controlling smog

With the rapid economic development, air pollution is becoming more and more serious, especially the rare haze with wide range, high intensity and long time in the eastern and central regions, which has caused serious harm to people's production, life and physical and mental health. Haze is not a "patent" in China. Air pollution has long been recorded in foreign history. Air pollution is mixed with a large amount of sulfur dioxide, nitrogen oxides and particulate matter to form haze. Air pollution is caused by combustion, coal combustion, chemical industry, automobile, construction, etc. in large cities, it is obviously the main factor of air pollution caused by automobile exhaust and coal combustion. When the air above the earth is controlled by the high pressure zone, the atmospheric humidity increases, coupled with a large number of harmful gases discharged from factory production and pollutants discharged from residential heating coal, haze will appear. China's coal consumption ranks first in the world, and coal is one of the reasons for haze. One of the measures to control smog is to change the traditional energy consumption habits, implement the power substitution strategy, and improve the proportion of power in the consumption terminal, which can reduce the pressure of environmental pollution and provide a new path for the quality of smog.

The characteristics of energy distribution in China are: most of the coal resources are in the north and northwest, the areas rich in hydraulic resources are in the southwest, and the land wind energy is mainly concentrated in the northwest, northeast and northern North China. However, 70% of energy demand is concentrated in economically developed areas in the East and central regions and large coastal cities. With the transfer of energy development strategy, vigorously promoting the construction of large energy base can quickly change the mode of energy consumption dominated by fossil energy. At the same time, vigorously develop clean energy, wind energy and solar power generation, so as to deliver a large amount of electric energy for the economically developed areas in the East and central regions and improve the support for the implementation of the electric energy substitution strategy.

Electricity comes from afar. UHV power grid has the advantages of large transmission capacity, long transmission distance and low power loss. Only installing UHV power grid as the backbone, large capacity and long-distance transmission can meet the needs of cross regional flexible allocation and consumption of electric energy. This can not only realize the optimal allocation of energy in a wider range, but also change the development mode of local power consumption balance, realize the friendly and interactive power supply mode of large power grid, and adapt to the power demand of remote economically developed areas.

The development of UHV power grid can not only change the mode of energy development and transportation, but also accelerate the development and utilization of energy bases. At the same time, it can also reasonably arrange thermal power plants, change coal transportation into transmission, and transmit a large amount of clean electric energy to the economically developed areas in the East and central regions, so as to meet the power demand of load centers, improve the proportion of electric energy in consumption terminals, and provide support for the implementation of electric energy substitution strategy. Only through the UHV power grid can the remote clean energy be sent to the load center, which can not only meet the diversified power demand of economically developed areas, but also reduce the pressure of environmental pollution and open up a new path for controlling smog.

4、 Concluding remarks

Let the power grid construction develop harmoniously with the ecological environment, and let the silver line of the iron tower integrate with the green mountains and green waters. This is the way for the power grid builders to explore the harmonious coexistence of power grid and ecology. Only by firmly establishing the concept of environmental protection construction, brainstorming and innovating the ideal environmental protection construction scheme in the power grid construction can the impact of power grid construction on the ecological environment be reduced to a low degree.

Only by developing UHV power grid can electricity come from afar. This can not only meet the diversified power demand of economically developed areas in the East and central regions, but also effectively reduce the pressure of pollution and open up a new path for controlling smog. Strive to promote the implementation of the "new energy, new town and new life" project, provide power supply guarantee for improving the quality of life of the people, and realize the harmonious coexistence of power grid and ecology.