Microgrid Modes of Operation
Microgrid Demonstration Project

The Alectra Utilities (formerly PowerStream) Microgrid is designed to seamlessly connect or disconnect from the distribution system. When connected to the grid, the phase, voltage, frequency, and phase angles of the renewable energy generation sources, batteries and system loads are synchronized to the grid.

 

Supply to grid icon1. Supply to Grid: The Alectra Utilities Microgrid is connected to the distribution system and is supplying energy to the grid using renewable solar or wind power. Stored electricity from the Sodium Nickel Chloride, Lithium Ion Battery and Lead Acid Battery Systems can also be used to supply energy to the grid. During the Supply to Grid operating mode, the natural gas generator will not be operated.
Microgrid supply from grid icon2. Supply from Grid: The Alectra Utilities Microgrid is connected to the distribution system and is taking energy from the grid to power its load. Electricity can also be stored in the Sodium Nickel Chloride, Lithium Ion Battery and Lead Acid Battery Systems for future consumption. During the Supply from Grid operating mode, the solar photovoltaic system and wind turbine system may also be powering the load and charging the batteries, but the natural gas generator will not be operated.
Microgrid island generator icon3. Island (Generator): The Alectra Utilities Microgrid is designed to operate in isolation from the distribution grid with the Island (Generator) operating mode. During this mode, the natural gas generator will be the primary source of electricity with the renewable solar and wind generators providing supplementary power. Electricity stored in the Lead Acid, Sodium Nickel Chloride and Lithium Ion Battery Systems can also be used at this time.
Microgrid island no generator icon4. Island (No Generator): The Alectra Utilities Microgrid is designed to operate in isolation from the distribution grid with the Island (No Generator) operating mode. During this mode renewable solar and wind generators will be primary source of power. Electricity stored in the Lead Acid, Sodium Nickel Chloride and Lithium Ion Battery Systems can also be used at this time. Since all generation sources are intermittent with this operating mode, low priority Microgrid loads may be disconnected depending on the amount of generation available.
Microgrid black start icon5. Black Start: The Alectra Utilities Microgrid is designed to have black start capability that involves using backup systems to help launch the Microgrid’s generation sources. During this mode, the Microgrid is not connected to the distribution system and does not have electricity serving its load. The Microgrid will use the backup systems to initiate the renewable generation sources and connect the battery systems to help restore power to system loads.
Microgrid unintential outage generator icon6. Unintentional Grid Outage (Generator): The Alectra Utilities Microgrid is designed to operate in the event of an outage on the distribution system and provide seamless service to its loads. In this scenario, the Microgrid will automatically disconnect from the grid and start drawing electricity from the natural gas generator, renewable energy sources and battery systems.
Microgrid unintentional outage no generator icon7. Unintentional Grid Outage (No Generator): The Alectra Utilities Microgrid is designed to operate in the event of an outage on the distribution system and provide seamless service to its loads. In this scenario, the Microgrid will automatically disconnect from the grid and start drawing electricity from renewable energy sources and battery systems. Since only intermittent generation sources are available, low priority Microgrid loads may be disconnected depending on the amount of generation available.
Microgrid unintentional outage generator icon8. Intentional Grid Outage (Generator): The Alectra Utilities Microgrid is designed to operate in the event of an outage of the distribution system and provide seamless service to its loads. Utilities from time-to-time have planned outages to allow for maintenance and servicing. In this scenario, the Microgrid will automatically disconnect from the grid and start drawing electricity from the natural gas generator, renewable energy sources and battery systems. Since this operating mode involves a planned outage, the battery systems can be fully charged ahead of time to maximize the amount of power for loads during the outage.
Microgrid intentional outage no generator icon9. Intentional Grid Outage (No Generator): The Alectra Utilities Microgrid is designed to operate in the event of an outage on the distribution system and provide seamless service to its loads. Utilities from time-to-time have planned outages to allow for maintenance and servicing. In this scenario, the Microgrid will automatically disconnect from the grid and start drawing electricity from renewable energy sources and battery systems. This operating mode involves a planned outage and hence the battery systems can be fully charged ahead of time to maximize the amount of power for loads during the outage. However, since only intermittent generation sources are available, low priority Microgrid loads may be disconnected depending on the amount of generation available.