At the China Electric Equipment Innovation and Development Forum, Du Hong, general manager of Beijing North Microgrid Technology Co., Ltd., introduced the positioning, boundary, capacity, and typical model cost analysis of the microgrid. Polaris Power Grid organizes the content as follows: Microgrid positioning: Microgrid is a distribution subsystem that accesses distributed generation: its essence is an intelligent distribution network; microgrid should be a bridge between distributed generation and large grids; microgrids can promote distributed generation. A high proportion of access to higher-level power grids reduces the impact of unstable renewable energy distributed generation on the grid, thereby facilitating distributed power generation, especially the rapid development of distributed photovoltaic power generation. In short, the large-scale power grid, the power source, and the micro-grid are the bridges. The distributed power generation that can't be accessed can be accessed at a high rate, and the unfavorable waste electricity can be used in good quality. Let power users get benefits. Comprehensively, the boundaries of the domestic microgrids are now set out as follows: The voltage level is 35kV and below, including 35kV, 10kV, and 400V: The boundary between the large power grid and the microgrid substation or the opening and closing station is exported; the internal variable power distribution system is included; Including micro-grid monitoring, protection, metering, communications, energy management systems; energy storage systems with regulation; access to (but not include) high-proportional access (but not included) of various distributed power generation systems (but not including) energy storage power stations; It can ensure the safe, stable and reliable power supply in the microgrid, and can ensure the power supply of important loads when it is isolated; it can access and manage the adjustable load. Microgrid capacity: The capacity of the microgrid refers to the rated capacity of the microgrid that can guarantee a stable supply of power; the capacity ranges from 30kW to 50MW; the capacity range covers most of the distributed generation; the microgrid has internal configuration for the regulation of energy storage The system is matched with its capacity; the capacity of the distributed power generation that the microgrid can access is related to its capacity and energy storage configuration. The target is a high proportion of access to distributed photovoltaic power generation, which should be >25%. For example, 30% and 50%. , 80%, 100%; Microgrid through energy management systems, comprehensive control of energy storage, distributed generation, adjustable load, to achieve a safe, stable, reliable, efficient operation of the microgrid. Due to the diversity and uncertainty of microgrids, economic analysis of microgrids is still a problem. In the past, some analysts often put microgrids and distributed generation together, and felt that microgrids added a piece of construction cost to conventional distributed generation. This caused people to misunderstand the high investment costs of microgrids. This plan proposes that the comparative reference of the microgrid cost should be the large power grid, especially the distribution grid in the large power grid, rather than the power supply itself of distributed generation. Power or power supply. The grid needs to go to the grid. As China's electricity market is underdeveloped, the cost of power grids is not very clear. According to statistics, the cost of power grids is approximately 1 to 1.5 times the cost of power supplies. The power grid here refers to a complete large-scale power grid that includes transmission, transformation, and distribution. The power supply refers to traditional thermal power, hydropower, and so on. Therefore, as a micro-grid, which is mainly built with the access of distributed new energy, its cost is compared with the cost of new energy sources, and the determination of a proper ratio should be a meaningful idea.
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