As one of the most concerned topics in the field of renewable energy utilization and smart grids today, a major breakthrough has been made in the development of smart microgrid technology. Recently, China's first island-based MW-class “wind, light, diesel, and storage†smart microgrid system was successfully developed by China Industrial Solar Technology Holdings Co., Ltd. and successfully operated on the island. New energy use and the new situation of smart microgrid construction.
The so-called “wind, light, diesel, and storage†is the abbreviation for wind power generation, photovoltaic (solar) power generation, diesel power generation, and battery energy storage; “smart microgrid†is a system consisting of a load and a miniature power supply. It can not only operate independently, but also can be integrated into the power grid. Its role is to maximize the use of renewable energy to form a distributed power supply, and improve the reliability of power supply, reduce costs and achieve intelligence.
According to Ping Fan, deputy director of the Management Committee of Zhuhai Wanshan Ocean Development Pilot Zone, Dongao Island is located in the central part of the Wanshan Islands and is one of the 140 islands with the most tourism development value in Zhuhai, with a permanent population of more than 600 people.
The power supply in Dongao Island has always been a bottleneck that hinders the economic development and ecological protection of the island. Since the island is currently building (expanding) five tourist resort hotels and clubs, the number of people visiting the island each year is about 30%, and the island’s demand for electricity is increasing day by day. In the past, the installed capacity of diesel power generation on the island was 1,220 kW. In 2009, diesel power generation was approximately 1 million kWh. Diesel power generation is not only costly, but also has low power generation efficiency. It also emits about 1,000 tons of carbon dioxide, 30 tons of sulfur dioxide and 270 tons of dust. Therefore, the governments of Zhuhai and Wanshan District have always emphasized that finding a solution for the supply of island energy based on the use of renewable energy is the key to solving the problem of deep island development, sustainable development and the construction of an ecological island.
According to the natural conditions and land resources of the island, Xingye Solar Energy Co., Ltd. builds 1,000 KWp of photovoltaic (solar) power generation, 50 KW of wind power, and 2000 KWH of battery energy storage systems to form a new distributed power supply system for the island and the island's existing diesel power generation. The system and grid transmission system are integrated into a smart microgrid system. The most important feature of this system is to make the best use of the abundant sunlight and wind resources on the island, to make the least use of traditional diesel power generation, and to provide green power for the island.
Grid technology is crucial to the development of clean energy. The rapid development of clean energy has also brought new challenges to the power grid. At present, clean energy mainly uses distributed generation technologies. In contrast to our previous centralized power generation through hydropower and thermal power, and through different UHV and high-voltage power transmission methods, distributed generation is a new type that is compatible with the development of clean energy. trend. Its characteristic is that it is very close to the user's end, and the capacity is usually relatively small, generally megawatts. At present, large wind power is centralized, but small wind power is distributed, and another characteristic of distributed generation is the power generation unit. The energy storage units are together, and the energy storage unit can play a role in peak shaving and cutting, while improving energy efficiency.
Judging from the current technological development trend, the core of the concept of smart microgrids in the world is the same, which is to meet the requirements of multiple power quality, improve the reliability of power supply, reduce costs and achieve intelligence. The microgrid itself is a complete distribution network, has its own energy management system, effectively manages its own energy and load, can operate independently, and can also be integrated into the power grid. Therefore, the microgrid can be viewed as an integrated energy source and load. Micro distribution network module can be easily incorporated or cut out.
China Singyes Solar Technology Holdings Co., Ltd. developed and constructed a megawatt smart microgrid project in Dongao Island, Zhuhai, including solar photovoltaic power generation systems and wind power generation systems, and a variety of energy-generating power generation units consisting of diesel power generation systems. The energy storage unit, as well as a control unit composed of bidirectional inverters and controllers, and a monitoring unit composed of GPRS wireless communication. The power generation unit is composed of Dong-A Power Plant and the Cultural Center's two-level power generation system. In the future, there will be multiple levels of multi-energy access. The power generation systems at all levels can exchange information and are controlled by the control system. From a structural point of view, the Donglu Island project in Zhuhai includes power generation units, energy storage units, and intelligent controls. The multi-level power grids are quickly and securely cut in or out. From a functional point of view, micro-energy and load integration are realized, and clean energy is connected. Into and operate, it also has an independent energy control system. Therefore, the megawatt smart microgrid project developed and constructed by Xingye Solar in Zhuhai Dong'ao Island is a successful demonstration of smart microgrid technology application in China.
“The Dongao Island MW-level smart microgrid technology is our success in 3 years of development and the use of more than 100 professional and technical personnel.†Liu Hongwei, chairman of China Industrial Solar Technology Holdings Co., Ltd., has a lot of emotion. “Two years ago Dongao Power Plant is a pure diesel power generation system. Replacing such a high-energy and unstable power generation system with a smart micro-grid system with complementary scenery has many technical difficulties and obstacles. Some people even assert that it is impossible. â€
With the entire system put into operation, the proportion of renewable energy power generation in Dong'ao Island will increase from 30% to 70%, especially in the off-season tourism of islands, the island does not need to start diesel power generation. At the same time, nearly 1,500 tons of carbon dioxide, 45 tons of sulfur dioxide, 408 tons of dust and 6,000 tons of clean water will be reduced each year. This model has successfully opened up a brand new situation for the island's new energy use and smart microgrid construction.
It is worth mentioning that this advanced system solution is also very worthy of commercial promotion. It can be used not only on the island but also in areas where there is no electricity, pastoral areas, or even every city. This is the use of renewable resources in China. The important path for energy use.
Venous cannula is also a deep venous puncture catheter. The method is to select the appropriate puncture site and insert the needle under the skin, and insert the needle with negative pressure until the dark red blood is absorbed, indicating that the needle has entered the vein, and the guide wire is inserted. Withdraw the puncture needle to leave the guide wire in the blood vessel, and then insert the venous catheter that needs to be indwelled along the guide wire, then exit the guide wire, inject diluted heparin saline and fix the catheter, the deep venous catheterization is completed. The veins for puncture and catheterization are usually selected clinically, including the subclavian vein, internal jugular vein, and femoral vein. After the puncture catheter is indwelled, attention must be paid to the care of the puncture site to avoid infection with thrombus or catheter falling off.
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