CLIENT PROFILE
The client is a publicly owned electricity generation and distribution company located in the Midwest.
SCOPE OF PROJECT
A study was conducted to see if a 50MW Microgrid addition should be created in a downtown area of a major Midwest city. The Microgrid addition had the potential to spur economic development of facilities requiring an increased electrical grid resiliency, consisting of N+1 system redundancy and 9/5 (99.999%) reliability.
Our team of electrical engineers reviewed the proposed layouts, configurations, intertie points of connection and the client’s ability to support the proposed 50MW load via leveraging of substation transmission and distribution feeder infrastructure.
Scope of Services Provided
Planning and design consisted of the following:
- Reviewed existing substation and primary feeder capacities at 11.5kV and 138kV substations to determine if the projected 50MW and MVA capacities currently existed at those substations
- Recommended substation and feeder additions as required to support the proposed primary and secondary Microgrid substation interties
Results
Scope of work definition to advance a Microgrid-client interconnection included the following:
- A primary 50MW intertie to the existing 138KV system via a Ring Bus/50MVA 11.5kV Substation addition at a pole storage location, tapping the Q106 138kV transmission line
- The 50MVA 11.5kV rated underground microgrid distribution feeders from a substation location to a new microgrid 11.5kV distribution substation located near a planned facility addition
- Secondary 20MVA 11.5kV rated underground microgrid distribution feeders originating from an existing substation to another existing substation, to allow a microgrid substation to intertie to an existing substation and prevent overloading of existing feeders
- 20MVA 11.5kV feeders/tie routed underground from the a primary microgrid 11.5kV distribution substation located near/at the planned facility addition, to the secondary microgrid 11.5kV distribution substation located near/at another existing substation, to provide microgrid substation resiliency associated with two points of interconnection to the grid.
- 5kV substation with a load capacity of 30MW connected to the primary microgrid 11.5kV distribution substation via 11.5kV feeders routed underground with a 30MVA capacity
- Microgrid 11.5kV underground distribution feeder system with N+1 feeder capacity
- Additional microgrid infrastructure improvements and additions consisting of Sub Mods, Sub Upgrades, Microgrid 11.5kV Battery Systems, and Microgrid Protection and Control Systems