Haisha Sansha Yongxing Island, a coral island formed by white coral shell sand piled up on a reef platform, the sea is blue, the beach is white, the sea birds are in groups, the trees are shaded, and the beautiful scenery is desirable. However, because it is far away from Hainan Island, it can only be powered by small generators. There are often trips and power outages. The fishermen who store seafood freezers are often burnt out and bring pollution to the island's environment. On May 27th, the Sansha Yongxing Island smart microgrid, which is complemented by diesel power generation, photovoltaics, energy storage and other energy sources, was built into the first remote island intelligent microgrid in China. Since then, the island has been able to supply power with the city. Sex. For the offshore islands, power supply often has technical problems such as high energy transportation costs, extremely vulnerable to corrosion damage to power generation equipment, and the inability to build large power plants due to area constraints, which greatly affects the normal production and life of island residents and restricts the island economy. development of. “Before the smart microgrid was completed, the power supply of Yongxing Island had energy waste and environmental pollution, low reliability of power supply and poor power quality. With the successful commissioning of the smart microgrid, the power supply capacity of Yongxing Island has been improved 8 At the same time, the microgrid can also achieve 100% priority utilization of clean energy such as photovoltaics. In the future, it can also realize flexible access of various energy sources such as wave energy and mobile power.†Ye Shifeng, deputy director of China Southern Power Grid Sansha Power Supply Bureau introduced . At present, in some remote mountainous areas and islands in China, there are still some “power blank areas†that are not energized or have unstable power supply. If the traditional grid power supply is costly, the smart microgrid that uses local renewable energy to generate electricity and configures the energy storage system is a suitable solution to solve the power supply problem in these areas. Yongxing Island smart microgrid, where is “smart� Ye Shifeng said that this is mainly reflected in three aspects: First, multi-level micro-network joint optimization control. Through the linkage adjustment of energy storage and distributed power supply, the full consumption of clean energy is realized. The second is multi-energy complementary coordinated operation control. Through micro-grid optimization operation and energy management technology, under different operating conditions, the optimal management and coordinated operation of multiple energy generation, energy storage and load can be realized, and the operation of petrochemical energy power generation equipment and pollution exhaust emissions can be minimized. The third is the intelligent operation of the intelligent load and the grid. Through the intelligent interaction technology of microgrid and multi-level controllable user load, the system issues controllable load removal instructions according to power balance and load priority, ensuring safe and stable operation of the power grid and important load power supply. As an application demonstration project in the field of national power technology, Sansha intelligent microgrid energy management system has undergone three years of research and practice. The system main station is set up in Yongxing Island, which can collect and monitor various load data such as diesel generators, photovoltaic systems, energy storage systems, main sub-microgrids, seawater desalination and charging piles. In order to ensure reliability, the Yongxing Island microgrid is connected to the Hainan Electric Power Dispatching Control Center over 400 kilometers by submarine fiber. When needed, the island's microgrid can be regulated in Haikou, thus making the island's power supply reliable. improve. What are the characteristics of a smart microgrid compared to a normal grid? Ye Shifeng said that the smart micro-grid "small but small, complete." Different from the big power grid, the power used by the smart microgrid is generally distributed renewable energy, such as diesel power generation, wave power generation, wind power generation, photovoltaic power generation, etc.; localized digestion of distributed energy sources, local balance At the same time, it can also exchange energy with multi-level microgrid to ensure energy-saving, environmental protection and economic operation. “In addition, the control and related protection technologies inside the smart microgrid have some corresponding differences compared with the large grid. The large grid is mainly a one-way flow, simple interaction, from the power plant through the transmission line to the user, while the microgrid is internal The cycle, so it is a two-way operation. The energy exchange between the user and the grid is a two-way flow, which is an active interaction. This is the difference between the micro-grid and the traditional power grid, which improves the energy efficiency." Ye Shifeng explained. Since the trial operation of Sansha Intelligent Microgrid Energy Management System in 2017, the power supply reliability rate, voltage qualification rate and clean energy consumption rate have reached 100%, and the annual fuel consumption has exceeded 400 tons, which is about RMB 2 million. In the future, China Southern Power Grid plans to replicate the power supply modes of distributed power modes including wave energy, photovoltaics and energy storage to the same type of island reefs to improve the production and living electricity consumption on the island. "This is just the beginning. In the next step, we will copy this model to other islands, and at the same time speed up the construction of wave power, and use the waste heat from power generation to better meet the energy demand of the island." General Manager Fu Yongfeng said. The intelligent micro-grid realizes the full consumption of clean energy such as photovoltaics through the linkage adjustment of energy storage and distributed power. The picture shows the photovoltaic power generation unit of Sanxing Yongxing Island in Hainan. Han Haiguang photo Litecoin is an online currency based on peer-to-peer technology and is an open source software project under the MIT/X11 license. It can help users make instant payments to anyone in the world [2]. Litecoin was designed and programmed by a programmer (Li Qiwei) who used to work at Google, and launched on January 9, 2011. Litecoin is an improved digital currency inspired by Bitcoin. The technical principle of Litecoin is the same as that of Bitcoin. 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