Why "grow the sun" in Gansu Hexi Corridor, energy gold card?

Wen | Half Mu Fang Tang

For thousands of years, mankind is full of infinite yearning and desire for the universe. Jiang Jie of the Song Dynasty wrote in "Hexinlang - Wujiang", "The stars and the moon, the clouds and the ravines on a single day, where is the vastness of the universe to be seen?" Plato's ultimate philosophical questions of "Who am I, where did I come from, and where am I going?" all reflect mankind's self-exploration and longing for the unknown. Based on the growth of the Earth, human vision and action has never left the profound and mysterious universe, from satellite launch to manned spaceflight, from the launch of planetary probes to land on the outer planets, from the search for unknown life to the search for habitable planets, the human exploration of the footsteps have never stopped.

So what is it that keeps humanity motivated to overcome each and every one of these "difficult" hurdles, and achieve eye-opening results one after another?

In his new book, A Brief History of the Solar System, Chinese science writer Wang Jie tells the story of mankind's perseverance in the face of the universe, and describes the three great spirits of mankind: rising to the challenge, advancing in the face of difficulties, and overcoming them.

In ancient times, there was a severe drought in the land. The heat scorched the forests, dried up the earth, and dried up the seedlings and grasses. Originally, Emperor Jun and Xihe gave birth to 10 children are the sun, they live in the East overseas, sea water, there is a large tree called Fusang. 10 sun sleep in the bottom of the branch, take turns to run out in the sky duty, shine on the earth. But sometimes, they come out together to bring disaster to mankind.

In order to save mankind, Hou Yi opened his bow and arrow and shot at the 9 suns. The sky exploded with fireballs and a three-legged crow fell down. In the end, there was only one sun left in the sky.

In 1988, a song called "Planting the Sun" was widely sung by children, which goes like this:

The sun radiates a lot of energy into the cosmic space all the time. The amount of energy absorbed by the Earth from the sun in one year is equivalent to tens of thousands of times the total energy currently consumed by the world in one year. The use of solar energy by human beings began in ancient times. The earliest utilization of solar energy is also counted in our country. As early as 3,000 years ago in the Western Zhou Dynasty has begun. Ancient books recorded: "When it is clear, take fire from the sun with gold flint." That is, with a concave mirror made of copper to focus the sunlight and take fire.

In modern times, the direct use of solar energy, has long been an important scientific and technological work. China held in 1975, the first national exchange of experience in the use of solar energy. Since then, the research and promotion of solar energy utilization across the country has been developing steadily. Solar cookers, solar stills, solar air-conditioning units, solar cells and other large and small devices and appliances are constantly being manufactured and used.

The utilization of solar energy is also highly valued internationally. France in 1978, the government set up a "solar energy department" to lead the national solar energy research work. Pyrenees mountains 1000 kilowatts of solar power plant has been operating. The United States plans to build in 1985 5 ~ 100,000 kilowatts of solar power stations, but also ready to launch solar satellites, with orbital solar collectors into microwave beams or laser beams of solar energy, sent back to the ground station.

With many other sources of energy than, solar energy has particularly outstanding advantages:

First, inexhaustible, inexhaustible;

Second, very stable;

Third, inexpensive;

Fourth, completely pollution-free.

Therefore, the utilization of solar energy has a bright future. For a long time, many scholars have been committed to the exploration of solar energy utilization. Mendeleev, the Russian chemist and producer of the first periodic table of elements, once wrote: " It is conceivable that there are such factories where free solar energy turns free air and water into food. "

Solar energy has a bright future as a permanent, clean source of energy that has gained a lot of traction. In the effective utilization of solar energy, solar power systems are one of the fastest growing and most dynamic areas of research in recent years, and is one of the most talked about projects.

Since the photoelectric effect under the same action of two great gods, Hertz and Einstein***, the acquisition of electricity and its technical applications have been the proposition explored by the scientific community, and electrical power has become a symbol of the progress of civilization.

In 1821, Faraday invented the electric motor, which is the originator of all electric motors used in the world today.

In 1831, Faraday discovered electromagnetic induction, creating the world's first generator capable of producing continuous current.

In 1879, Thomas Edison invented the incandescent light bulb.

In 1882, the Pearl Street Power Plant in Manhattan, New York, went into operation with six 120kW steam engine generator sets.

China's earliest power plant was also a foreign investment of more than 100,000 taels of silver, built in 1882, and completed in 1895 in Shanghai Feilun Road and began to supply electricity. This is the British in the Shanghai Concession established the Shanghai Electric Light Company.

It can be said that the integration of light and electricity has gone through one spring and one fall.

At present, solar energy is mainly utilized in several conversion methods, such as light-heat, light-electricity, light-chemistry, light-biomass, and so on, and the two most important methods are: one is the light-heat and electricity conversion method, and the other is the light-electricity direct conversion method. What is the difference between these two ways of generating electricity?

Solar thermal power generation refers to the use of large-scale arrays of parabolic or disc-shaped mirrors to collect solar thermal energy, and provide steam through a heat exchanger device, combined with the process of traditional turbine generators, so as to achieve the purpose of power generation.

Solar photovoltaics is a technology that utilizes the photovoltaic effect at the interface of semiconductors to directly convert light energy into electricity.

The big difference is that solar photovoltaic is a technology that converts light energy into heat energy, and then generates AC power through the traditional thermal cycle. And photovoltaic power generation is sunlight irradiation of high-purity silicon, so that the electrons jump, the formation of potential difference, light energy directly into electricity, which produces direct current .

However, photovoltaic power generation is unstable and intermittent, with lower power quality and high grid integration requirements. There will be an impact on the grid operation. Photovoltaic power generation output power is stable, the power is adjustable, and easy to connect to the grid.

In addition, photovoltaic power generation time is shorter, photothermal power generation time is longer. In photovoltaic power generation, the water burned hot by solar energy can be stored in huge containers that can still drive turbines to generate electricity hours after the sun goes down.

Now, photovoltaic has a unified national benchmark tariff, while solar thermal is still using concessionary bidding or a negotiated tariff. The cost of photovoltaic electricity is lower than the cost of solar thermal electricity, good economy. At present, the cost of photovoltaic electricity is about 0.85 yuan per kWh, and the cost of photovoltaic electricity is about 1.8 yuan per kWh.

From the development pattern, the photovoltaic power generation industry chain is more mature, the development is more rapid, the installed capacity of the power station is growing faster. The photovoltaic power generation industry has just started, the industrial chain is not perfect, industrial development is faced with many problems such as the choice of technology routes, the localization of related key equipment, and system integration.

The cost of photovoltaic power generation is declining rapidly, and photovoltaic projects are more likely to be financed, while for photothermal power generation, the cost is still high, and banks and financial institutions have a low acceptance of it.

Another difference is that photovoltaic power generation is mainly used for distributed power generation, while solar thermal power generation is mostly used for centralized power generation.

In the long run, photovoltaic power generation and solar thermal power generation have their own advantages, the future of the two complement each other, *** with the development.

It is worth mentioning that in photovoltaic power generation, the PV inverter is a key technology, and Huawei's smart PV power generation equipment is already far ahead.

Why choose Huawei PV inverters?

As you know, DC power cannot be used directly, and the inverter is the core power conversion equipment that converts the DC power generated by PV solar panels into AC power. Huawei intelligent PV, is based on the string inverter as the core of the overall solution, the ICT technology and PV integration, compared with the traditional solution, power generation to enhance more than 2%, operation and maintenance efficiency to enhance more than 50%, the overall LCOE (kWh cost) can be reduced by 6%, can help PV comprehensively into the era of affordable. In the distributed scenario, it is with the innovative technology to create the ultimate safety, higher power generation, and open a new era of green and low-carbon.

The reason why Huawei can do the smart PV to the world's first, rooted in foresight, the strategy of the pre-buried. It can be said that without the power of Huawei, there is no "inverter Silk Road" singing PV Huawei.

In the Silk Road golden section of the Hexi Corridor, in addition to Gansu Dunhuang's photovoltaic power generation, Jiuquan Yumen Shouhang Hi-Tech Energy Technology Co., Ltd. 100 megawatts of tower-type molten salt photovoltaic power generation project, is located in Yumen Flowering Sea megawatt-scale photovoltaic power generation base, covering an area of about 9.1 square kilometers, with a total investment of 3.1 billion yuan, 10 hours of heat storage, the annual effective use of hours of 3880 hours. The hours of heat storage is 3880 hours. in November 2020, the project generator, reducer has been ordered, the foundation of the heat-absorbing tower is being constructed in a tight schedule, and the foundation of the heat-absorbing tower has been completed out of zero meters.

After the completion of this project, the average annual power generation capacity of up to 350 million kilowatt-hours, annual sales revenue of 400 million yuan, annual savings of 120,000 tons of standard coal, emission reduction of 350,000 tons of carbon dioxide, economic benefits and energy-saving emission reduction benefits are very significant.

As early as 2014, Gansu Province, the first desert ecological photovoltaic power station by Jiangsu Zhenfa Holding Group invested 5.2 billion yuan, in the Gulang Bubu sand east of the northern desert area of the Ma Lu Tan forest, built 500MW desert photovoltaic power station; planning to control the sand 24,000 acres. At present, a 50MW photovoltaic power station has been completed, a completed investment of 560 million yuan, has been officially connected to the grid, the annual power output of 0.8 billion degrees.

Hexi Corridor, the use of new technology planted "sun" has turned the night into daytime use.

Looking back at history, in this corridor, in 200 BC, 56-year-old Liu Bang, founder and CEO of the listed company of the Han Dynasty, did a big job - personally led an army of 320,000 to meet the Xiong Nu, the results of the enemy's adventurous, was besieged in the Baideng Mountain 7 days and 7 nights, and later, the use of Chen Ping's plan to get out of danger.

More than 2,000 years later, the Hexi Corridor is still 2,550,3500 hours of sunshine a year, we can still recall the year Liu Bang composed the "Song of the Great Wind" here, where the wind and light by the use of new technologies, become a "treasure bowl" and "the world's wind reservoir". The wind and light here have been utilized by new technologies to become a "Treasure Tank" and a "World Wind Reservoir".

Imagine, if it is not the Han people took the Hexi Corridor, thousands of years after the power generation has become empty talk, but also a laughing stock.

The smoke of history has been echoing, corridor, gallery, lounge is synonymous with this passage. Today, the "electric corridor" has become a national business card. In the future, the car has become a new organ of man, the popularity of electric cars under the car micro-vehicle, AI, 5G background, so that this "electric corridor" in people's lives accompanied by a thousand years of scenes, unique.