In order to support the clean transformation of energy structure and the revolution of energy consumption, the national key R&D plan launched the key project of “Smart Grid Technology and Equipment”. In order to improve the full consumption and utilization efficiency of distributed energy, a multi-energy complementary distributed supply was set up. Can be oriented with microgrid technology. As an important practice of this technology, in early 2016, State Grid Jiangsu Power and Lianyungang Frontier Detachment teamed up to work together to build an “AC-DC hybrid” island smart microgrid in Lianyungang’s Che Niushan Island, which was put into trial operation in December 2017. And on April 25, 2018, the acceptance was officially put into operation. The project is equipped with the first AC-DC hybrid, three-port converter in China, providing an effective solution for high-quality electricity use in offshore islands.

Up to now, the Che Niushan Island microgrid has generated a total of 57,600 kWh of electricity and purified fresh water of 61 tons. The power supply and water supply have become self-sufficient, changing the history of regular supply of diesel power by the supply ships. The project is a successful exploration of “AC/DC hybrid distributed renewable energy technology research based on power electronic transformers”, and is also a substantial advancement of the implementation of national key R&D plans, for all “high seas” in the country (high altitude, islands, The continuous and reliable use of electricity in the border defense and no-man's land areas is of great significance.

At present, there are 6,536 islands with an area of ​​more than 500 square meters in China, of which more than 400 are inhabited, mostly small and medium-sized islands far from the land. For these islands, continuous and stable power supply has always been a luxury.

"The island we are stationed is far from the mainland. The usual support for the whole depends on land transportation. It is very inconvenient to use water. In order to solve this problem, our detachment installed wind and photovoltaic generator sets on the island. Now there is a smart microgrid. Power supply and water supply are no longer a problem. When the weather is good, more than 400 kWh of electricity can be sent every day. High-powered electric appliances such as air conditioners and electric water heaters have no problem in use, and can enjoy the same life as land. On the improvement of life, Sun Quan, director of the police station on the Niushan Island of Lianyungang, who is stationed on the island, said with emotion. The car Niushan Island, where Sun Quan is stationed, is located in the northeast of Lianyungang, 47.5 kilometers from the land, with a total area of ​​0.06 square kilometers. The island's mobile communication base stations, maritime signal stations and border defense units have long relied on diesel engines, photovoltaics and other energy supply. Like other islands far from the mainland, there are problems such as insufficient power supply stability, low automation level and shortage of drinking water.

“Che Niushan Island microgrid project fully utilizes AC/DC hybrid distributed renewable energy technology based on power electronic transformers. The 'three-port converter' is the biggest highlight of this project, and it has the microgrid on the island. The brain that can be thought of can intelligently dispatch electric energy such as wind power, photovoltaics, and storage batteries on the island, making the island electricity and land as stable and reliable,” said Yuan Xiaodong of the State Grid Jiangsu Electric Power Research Institute.

“In the past, the power supply was unstable. In winter, the average electricity consumption was only about 3 hours per day. The water was mainly supplied by regular recharge and rainwater collection, and barely met the basic domestic water demand. Now the power supply is stable and sufficient, and the desalination system is also installed. I can take a hot bath every day." The recruit Chen Hu was not very comfortable with the life of the island, but he was able to find a home after a hot bath every day. "And in photovoltaic and wind power generation. In the big weather, it is really convenient to use excess electricity to dilute the seawater for storage!"

After the construction of the intelligent microgrid of Niushan Island, the interconnection between the power points and the electrical equipment on the island is realized. Under different weather conditions, the electric energy between different users can complement each other and realize the 50 kW wind turbine on the island. Comprehensive utilization of island energy by 30 kW photovoltaic, 100 kW diesel engine and 450 kWh energy storage.

It is understood that the AC-DC hybrid intelligent microgrid of Che Niushan Island is based on a variety of green energy sources such as photovoltaics and wind power. With the "three-port converter" as the core, the AC and DC hybrids consisting of border defense, mobile and marine services are constructed. The microgrid uses the energy management system to precisely control the power generation, energy storage and power consumption, flexibly deploy the connection mode of each user, and realize the coordinated control and economic operation of “source-network-load-storage”.

As the core of the AC/DC hybrid intelligent microgrid, the “three-port converter” also enables the island power grid to have a “remote control unit” for remote operation and maintenance. The professional operation and maintenance personnel of the power grid far away from dozens of kilometers away from home. Real-time monitoring and remote diagnosis of the grid and electrical equipment on the island can be carried out, effectively solving the problem that the island is far away from the mainland lacking professional power grid operation and maintenance personnel, and the island power grid cannot be timely monitored and operated.

It is understood that State Grid Jiangsu Power is developing the first four-port micro-network router in China. The technology is currently in the world's leading level and will be piloted in the new energy town of Tongli, Suzhou, to build a “clean-oriented, electricity-centric” With the power grid as the platform and the replacement of electric energy as the key point, the modern energy system with multiple energy synergies complements the direction of modern urban energy development.

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