A microgrid is a small electric system that combines local energy resources and control technologies to provide power to a defined area. 微电网通常与主电网保持连接，但它们可以独立运行.
The controller serves as the lynchpin of the microgrid; it can activate demand response components, as well as control generation and storage resources to balance the system’s load with the resources available.
A microgrid can improve system reliability by generating their own power to avoid prolonged and rotating blackouts during and after storm events. 此外,微型电网:
- Provide a learning opportunity that will help discover future uses for microgrids and their components
- Help reduce power supply costs by providing an alternative source of power generation and storage
North Carolina’s electric cooperatives have four active microgrids, with one more in development:
奥克拉科克岛微电网, 位于北卡罗来纳州外班克斯, 于2017年2月开始运营. North Carolina’s Electric Cooperatives developed and installed the microgrid in partnership with local cooperative 潮间地EMC.
Ocracoke岛’s remote location leaves it vulnerable during weather events and isolated from central power generation sources. 微电网将为该岛提供更好的电力可靠性, serve as a resource that can be called on during times of peak demand and allow for the testing of system components to discover future uses.
微电网组件包括一个控制器, 太阳能电池板, 电池存储, 联网智能恒温器, 热水器控制器和柴油发电机.
巴特勒农场的微电网, 位于Lillington, NC, is a microgrid project that integrates components owned by North Carolina’s Electric Cooperatives with resources owned by the farm and seeks to incorporate alternative energy sources, 包括沼气, 太阳能和电池存储. The farm has existing generation used to support its power needs during times when service has been interrupted, 它还出售可再生能源产生的电力, 包括猪粪和太阳能, 到它的电动合作社, 南河EMC. 微电网于2018年2月投入运营.
The goal of this project is to learn more about how a microgrid located on a member’s property can be incorporated into the electric cooperatives’ distribution system, and it also serves as a case study for the ways agribusiness and utilities can work together to develop solutions that are mutually beneficial and support both industries, 以及北卡罗来纳州社区的生活质量.
该微电网的组件包括控制器, 太阳能电池板, 三星的电池, 沼气发电和柴油发电机. 微电网还被用作当地学生和教师的教育资源.
一旦全面运作, 该网站的30多个家庭将配备太阳能电池板, 需求响应式热水器, 需求响应ecobee可编程恒温器和电动汽车充电的选择. 节能和可持续发展的特点被融入到建筑材料中. A portion of the neighborhood is dedicated to a larger community solar array with 电池存储.
The community is made up of interconnected loads and resources connected to the main electric grid. 在典型的一天里, 居民将从主电网获得电力, 他们的太阳能电池板和社区太阳能阵列提供电力. 然而, 在风暴过后，主电网的连接是否会变得不可用, for example–the residents will benefit from continued solar power as well as the battery backup system. 除了, the demand response thermostats and water heaters can be controlled by the local electric cooperative to make more power available to the system during that time, 以及在需求高的时期.
鹰追逐 is another residential microgrid being developed by North Carolina’s Electric Cooperatives in Youngsville, NC与建筑商合作 温斯洛的家园 和当地电力合作社 后电, 其目标是提高电力服务的可靠性和弹性, 以及降低峰值电力成本. 在停电期间，微电网将能够支持社区长达36小时, and will also remain connected to the main grid during normal operations to provide power diversity and increased reliability.
The 鹰追逐 microgrid will include a single 300-kilowatt propane powered electric generator and a 1 megawatt-hour/500 kW Tesla PowerPack battery system. North Carolina’s Electric Cooperatives will own the battery and the microgrid controller that brings the various components together. The microgrid will also integrate smart water heater controls for each home that will help reduce peak demand for power. 后电 is offering a rebate for the installation of electric water heaters in each house, 每个家庭的车库也将预先有线为电动汽车充电.
该项目将集成太阳能电池板, energy storage and other components owned by North Carolina’s Electric Cooperatives with resources owned by the farm to create a microgrid that is capable of generating its own electricity during times of power loss. 它还将与主电网连接，以帮助提高可靠性和弹性.
该项目的第一阶段将包括安装一个2兆瓦的太阳能电池组, 2兆瓦电池储能系统, 这使得太阳能板产生的能量能够在需要的时候被储存和分配. 太阳能生产预计将抵消农场消耗的约三分之一的能源. The second phase of the project will add a microgrid controller that manages existing emergency backup diesel generators and all the other components to evolve the project into a full microgrid.