At present, under the background of energy reform, single energy services are gradually transforming into integrated energy services, which leads to the upgrading of energy supply methods, the release of power grids to social entities, and the complementary application of energy and energy Internet research applications. Expand. During the period, the micro-grid is also being given new functions and accelerating integration into the modern energy system while meeting the demand for electricity from electricity-free populations and improving the reliability of power supply in remote areas such as islands.
Microgrid demonstration application upgrade
On May 27th, China's first remote island intelligent microgrid was built in Sansha Yongxing Island, which increased the power supply capacity of Yongxing Island by 8 times.
According to reports, Yongxing Island can only rely on small generators to supply power, often there will be a situation of tripping and power failure, causing fishermen to store seafood freezer often burned out. The smart microgrid can be operated in isolation or in multiple ways. It can not only achieve 100% utilization of clean energy such as photovoltaics, but also flexible access to a variety of new energy sources such as wave energy and mobile power. At the same time, through the submarine fiber optic connection, Yongxing Island smart microgrid can also be regulated by Hainan Island Power Command Center more than 400 kilometers away, and the power supply reliability reaches the level of urban power grid. It is understood that this is another example of the micro-grid speeding up application in the island, which will provide a replicable construction mode for island power supply.
The so-called micro-grid, which is mainly composed of distributed power supply, energy storage device, energy conversion device, monitoring and protection device, can realize flexible and efficient application of distributed power supply, and solve a large number of distributed and diverse forms. Power grid connection problem. Due to the vast territory of China, some remote areas are difficult to connect with the large power grid and have been plagued by power supply difficulties. In this case, the microgrid has gradually developed.
From the “Distributed Power Generation/Energy Storage and Microgrid Access Control Pilot Project†project of Huerhunde, Chenbaerhuqi, Inner Mongolia, Hulunbeier, distributed power generation/storage and microgrid project in Weibei paddock, to the Changdao microgrid project in Shandong And then to the newly-invested Yongxing Island smart micro-grid project, China's research and application of micro-grid is deepening, and the upgrade from local multi-energy collaborative optimization, DC distribution and two-way interaction is realized.
Facts have proved that the development of China's large power grids and microgrids is parallel, and the development and transportation of centralized large-scale energy bases and the construction and development of distributed energy are all needed. Moreover, as an important supplement to the large power grid, the microgrid plays an increasingly important role in improving the reliability and safety of power supply and solving the problem of power supply in remote areas and islands. At the same time, the micro-grid is in line with the direction of electric power reform, which can expand the huge development space for new energy.
Microgrid is the foundation of energy interconnection
In recent years, the National Energy Administration has successively released pilots for incremental power distribution, multi-energy complementary pilots, energy Internet pilots, and new energy microgrids. Zeng Ming, director of the Energy Internet Research Center of North China Electric Power University, said: “Compared with the previous three types of pilots, the new energy microgrid pilot may be easier to operate and will promote the above three types of pilot projects. It should be said that the new energy microgrid The pilot is the basis for the aforementioned three types of pilots, and the four pilots complement each other."
At the same time, State Grid Corporation and China Southern Power Grid Corporation are actively deploying and expanding the comprehensive energy service market. To this end, some experts suggest that they should actively adapt to energy production and consumption changes, explore multi-energy complementarity, distributed energy integration, optimize integrated energy supply, etc. Key technologies to promote the deepening of microgrid applications.
Taking Zhejiang Jiaxing Urban Energy Internet Comprehensive Pilot Demonstration Project as an example, Zhou Jianqi, deputy chief engineer of State Grid Zhejiang Jiaxing Power Supply Co., Ltd. introduced: “The distributed photovoltaic grid connection of Jiaxing mainly adopts the intelligent microgrid operation mode to ensure the safety and stability of power supply and electricity in the microgrid. And complete the exchange of electricity with the external grid, to the maximum extent of the integration of distributed renewable energy." It can be seen that the micro-grid is an important market body of the energy Internet, and as a solution provider can provide multi-energy comprehensive utilization services, And can participate in energy Internet electricity trading, as well as provide a variety of ancillary services such as peaking. In addition, the microgrid can also participate in global energy optimization and integration with the energy Internet.
In May 2017, the National Development and Reform Commission and the National Energy Administration issued the Notice on the List of New Energy Microgrid Demonstration Projects, which identified 28 new energy microgrid demonstration projects, focusing on technology integration applications and operation management models and markets. Innovative trading mechanisms, these projects are currently in full swing. It is foreseeable that with the completion and demonstration of these projects, not only will new energy development such as distributed photovoltaics and energy storage be promoted, but also useful explorations will be made for multi-energy complementarity, energy Internet, and electricity reform, and the micro-grid will be promoted. It plays an important role in future integrated energy services.
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