The hottest hydrogen energy storage may become the

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Hydrogen energy storage may become a key technology to save wind and light

at the beginning of this year, the National Energy Administration officially announced the list of the first batch of multi energy complementary integration and optimization demonstration projects, with a total of two projects arranged to expand the measurement range. The demonstration project is just the beginning. According to industry estimates, the market space for multi energy complementary integration and optimization will reach more than trillion. As a new business form of the energy industry, the multi energy complementary integration optimization project has no mature construction and operation experience in China. Let's see how foreign countries explore the path of multi energy complementary

Germany's innovative multi energy complementary mode of wind power hydrogen production has brought dawn to solve the volatility of new energy

China has now become the world's largest renewable energy country with the installed capacity of wind power, but the utilization rate of these clean energy has been low, the phenomenon of wind and light abandonment in the country is very serious, and the maximum power limit of new energy enterprises is as high as 79%. According to the report of China's energy storage, in 2016, the amount of wind and photovoltaic waste in China alone reached 46.5 billion kwh, with a direct economic loss of more than 10billion yuan. From the perspective of distribution, the development of new energy is mainly concentrated in the "Three North" areas, with the installed capacity of wind power and Optoelectronics accounting for 77% and 41% of the country respectively. The scale is large, but the local market space is limited, which is difficult to be consumed locally. In terms of transmission capacity, the trans provincial transmission capacity of the "Three North" region is only 22% of the total installed capacity of new energy, and the construction of the power market is still in its infancy, which is difficult to meet the needs of large-scale trading and delivery of new energy

in contrast, Germany, another major new energy development country, accounted for more than 32% of renewable energy power generation in 2016. In some days, renewable energy can even cover about 90% of power consumption. With such a high proportion of renewable energy, the flexibility of the entire power system also needs to be improved. According to the analysis of the German Federal Ministry of environment, in order to absorb the increasing volatility of electricity, it is necessary to improve the flexibility in the following four areas:

key flexibility technologies under different renewable energy ratios

among them, energy storage is undoubtedly the key to solve this problem. In order to achieve the goal of 100% utilization of renewable energy, Germany has also found key energy storage technologies under different renewable energy shares through research. As we all know, the higher the proportion of renewable energy, the more difficult it will be to improve. Among them, the most difficult to achieve is the technology of converting electricity to gas. This cutting-edge technology is still facing many technical bottlenecks, application difficulties and profitability problems in many countries. However, in Germany, the first commercial multi energy complementary project for hydrogen production from wind power, H2 herten, has been completed in 2013

multi energy complementary project for hydrogen production from wind power in helten, Germany

the above is a picture of one of the hydrogen energy application points of this project. The development status of this kind of disordered industry. This is a multi energy complementary system with hydrogen as the main medium, with the top three industries accounting for 14%, 11% and 11% respectively. The wind farm 1.2 kilometers away nearby can supply the energy demand of 3000 square meters of offices and scientific research places every day, And the operation of local hydrogen fueled vehicles and buses

in the background of the photo, you can clearly see the former site of a coal mine. This coal mine named Ewald was once the largest coal mine in Europe in history, surrounded by 60000 residents. This area once rose because of its rich coal resources and lost its glory because of the decline of coal power. This project has revitalized the region. It can not only enjoy cheap and clean energy, but also get the attention of the world because of this pilot project

in order to make wind power that depends on the weather meet the reliability requirements of regional power supply, the core of the project is to use excess wind power for electrolytic production of hydrogen, which can be well stored and converted into electricity again through fuel cells in case of power shortage. This process is defined as: hydrogen based energy replenishment system (HECs), and its basic framework is as follows:

the HECs equipment of this project can provide 250 MWh of electricity and nearly 6500 kg of hydrogen per year. A part of hydrogen provides enough power for a nearby office building through fuel cells. The peak load of this building at noon can reach 50KW, and the annual power consumption is about 250 mW. In order to formulate the optimal wind power charging and discharging strategy, the system is equipped with a set of wind power generation prediction system and load prediction system. A 6-day wind power generation power and load calculated by the system are as follows:

if no energy storage system is added, the excess wind power will be abandoned, and it will even become a lack of power when there is no wind or little wind, and the wind power will be lower at noon at the peak of power consumption, The situation without HECs system in the above six days is shown in the following figure:

after integrating HECs system, wind power can ensure real-time power supply through an optimized system. The reaction speed of fuel cells can meet the needs of the system and ensure the reliability of power supply. The following figure shows the real operation situation:

it can be seen that when the wind power is insufficient, the HECs system can respond in time to meet the load demand. The project started operation on May 29th, 2013 and has been running well so far. Although this system is connected with large electricity to ensure the power supply of this office building in extreme cases, there is almost no large electricity used so far

this project has fully proved the possibility of self-sufficiency in micro electricity through the integration of hydrogen energy conversion equipment. The core of multi energy complementarity is to make up for the lack of large-scale storage of electricity through other forms of energy. Through the gb/2423.22 temperature shock experiment, the flexibility and easy transmission characteristics of electricity complement other energy sources. In the future energy system, we will see more different energy networks intertwined. This strong and flexible energy is the key to solve the high proportion of renewable energy applications

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