I. Concept definition Microgrid (microgrid or microgrid), also translated as microgrid, refers to a small-scale power distribution system that is a collection of distributed power supplies, energy storage devices, energy conversion devices, associated loads, and monitoring and protection devices. Autonomous systems that are capable of self-control, protection, and management can operate either in parallel with the external grid or in isolation. Second, the development of micro grid Microgrid Power Quality Control Electricity Security Grid Power Engineering Natural Gas Power Generation Electricity Environmental Protection Cogeneration Small Hydropower Coal Electricity Contradiction Electricity Nuclear Power Transmission and Distribution Equipment and Control Equipment in China More >> Forward 2013-2017 China Microgrid Technology Released by Industrial Research Institute According to the "Progress and Prospect Forecast Analysis Report", China's micro-grid is in its infancy, mainly pilot projects. Mainly in the domestic large-scale energy and power grid companies to participate in micro-grid demonstration project construction and related technology research. For example, the State Grid has successively done the Sino-Singapore Tianjin Eco-Business Smart Business Micro-Network Demonstration Project, Beijing Zuo An Men Smart Apartment, Henan Financial Specialized Distributed Photovoltaic Power Generation and Micro-grid Operation Control Pilot Project, Yushu “Golden Sun†Water Photovoltaic complementary microgrid power generation project and Zhangbei Fengguang Storage Technology Demonstration Project and other microgrid projects; New Austrian Group also constructed Hebei Langfang Future Energy Eco-city Microgrid Comprehensive Demonstration Project. Due to the current high investment costs and the lack of a suitable business model, Forward-looking Industry Research Institute believes that the microgrid will remain in the pilot phase in the next 2-3 years. Third, the advantages of micro-grid analysis Improve power supply security and reliability With the continuous increase in the size of China's power system, the continuous increase in the interconnectivity of the national power grid system, and the diversification of power consumption and other factors, China's power system is facing increasing pressure on safety and reliability. Forward-looking Industry Research Institute believes that microgrid is an effective measure to alleviate the current grid pressure, mainly due to the role of microgrids in cutting peaks and filling valleys of large power grids and improving the safety and stability of large power grids. Improve electricity utilization efficiency The microgrid can effectively identify the power consumption needs of the end user and the power supply in the network. Through the intelligent analysis of the power information, the power resource can be optimally configured and the waste can be reduced. At the same time, the distributed power in the network is very close to the end user and does not need to pass through. Long-distance high-pressure transmission lines have low line losses. Thus, the purpose of improving the power utilization efficiency is achieved. IV. Analysis of the Development Bottleneck of Microgrid Policy, technical bottlenecks Microgrid Power Quality Control Electricity Security Grid Power Engineering Natural Gas Power Generation Electricity Environmental Protection Cogeneration Small Hydropower Coal Electricity Contradiction Electricity Nuclear Power Transmission and Distribution Equipment in China More>> China's microgrid technology is in its infancy and is not mature enough. Advanced power electronics, computer control technologies, and communications technologies are not widely used in microgrids, and there is no unified and standardized microgrid system technology standard and specification in China, especially for microgrid access, planning, design and construction. There are no corresponding national-level technical standards and management practices in such areas as operations and equipment manufacturing. Cost factor constraints The high investment cost of micro-grid construction has become the main factor restricting the development of micro-grid. Micro-grid control system is expensive, its investment cost of energy storage system is high, and the energy storage system only accounts for the cost of the entire micro-grid control system. /3, together with the substation and control system, as well as the later operation and maintenance, have led to the high cost of microgrid. It can be seen that in the next 2-3 years, the microgrid will still be in the pilot phase and it cannot be industrialized. V. Prospects for Microgrid Development During the “Twelfth Five-Year Plan†period, the key task of the smart grid is to develop large-scale intermittent new energy grid-connected technologies, to break through the large-scale intermittent new energy power grid connection and energy storage, intelligent power distribution, intelligent power grid dispatch and control, Smart equipment and other key technologies of the smart grid. Microgrid is an organic component of the smart grid. As the country increases its investment in smart grids, microgrids also face good opportunities for development. In the future, as the micro-grid technology continues to mature, the cost of renewable energy decreases, the development of energy storage industries and the continued rise of fossil fuel prices in the future, micro-grid will have an explosive growth.
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