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Micro Grid Technologies
December 6, 2017
What are Micro Grids? A discrete energy system consisting of distributed energy sources (including demand management, storage, and generation) and loads capable of operating in parallel with, or independently from, the main power grid.
Agenda
1 The Traditional Grid
2 The Evolving Grid
3 Micro Grids
4 Energy Storage
Safety Moment Frost, Windshields, and Safe Driving
The Traditional Grid
The Traditional Grid • Central generation facilities
• Nuclear, thermal and Hydro Generation
• Transmission system • <69 kV
• Large-users directly connected to transmission system
• Local delivery of lower voltages (27.6 kV and 34.5 kV) by electric power utilities
• Further step-down by utility for connection to industrial, commercial and residential customers
• Stable supply • Not very flexible or adjustable
The Evolving Grid
The Evolving Grid
• Central generation is for base load • Distributed Generation (DG) located throughout both transmission and distribution system
comprising: Rooftop solar (typically <500 kW) Ground-mount solar farms ( typically >500 kW) Wind farms Bio-mass and bio-gas generation facilities Combined Heat and Power (CHP) facilities
• Hard to rely on renewable DG for base load due to variability • Variable load and location of DG’s can cause grid instability
Micro Grids
Micro Grids • A discrete energy system containing Distributed
Generation (DG) and storage which can run in parallel with the central grid or can run stand-alone (or islanded) from the central grid
• Generation resources are typically located closer to the load
• A backup diesel generator is an example of a basic micro grid developed for and under similar circumstances
• Focus today is on micro grids fueled by lower emitting technologies such as solar, wind, bio-mass and geothermal
Micro Grids - Components • Point of common coupling
• This is where the Micro Grid connects to the central grid. Think of it as a faucet that can be turned off and on, allowing electrons to pour in from a centralized power utility.
• Micro Grid controls • This is the brain of the Micro Grid. It manages the flow of electricity
throughout the system. The better the software, the more efficiently the Micro Grid will operate.
• Combined heat and power
• A combined heat and power plant that generate electricity and, as a byproduct, heat that can be used to warm water.
• Renewable energy • Rooftop solar panels and small-scale wind turbines provide power
• Energy storage • Home batteries store surplus power generated onsite.
Micro Grids - Uses • Ensures local, reliable power for communities, campuses
and buildings • Provides resiliency in the event of a storm or grid loss • Provides the ability to relieve grid congestion or to
compensate for weaker parts of the grid • Allows deferral of asset replacement / upgrade by
providing more balanced power flow • Provides a unique energy delivery model for owners and
utilities (offering off-grid services for an additional fee)
Micro Grids - Benefits • Provides power quality, reliability, and security for end
users and operators of the grid • Enhances the integration (and penetration %) of
distributed and renewable energy sources • Reduces dependency on “dirty fuels” such as diesel in
remote communities • Enables smart grid technology integration for fast-healing • Provides locally-controlled power quality • Minimize carbon footprint and GHG emissions by
maximizing clean local energy generation • Increased customer (end-use) participation
Micro Grids - Applications • University and hospital campuses • Military bases • Large commercial and industrial • Remote communities and islands • Sustainable communities • Electricity utilities • Renewable energy developers and EPC’s
Universities • Universities need safe,
reliable and secure energy supply to keep the lights on
• Facility micro grid assets can also serve as a “sandbox” or “test bed” for micro grid-based research
• Federal and provincial funding often available to augment financing when end-goal is GHG reduction as this aligns with North American climate change policy
• UC San Diego Micro Grid • Generates 92% of required load • $8M annual energy savings • Includes sola PV, a fuel cell and
cogeneration
Military Bases
• Resiliency and security are primary drivers • Micro Grids up and running at numerous US bases
Commercial Developments • Commercial viability of micro
grid where facility load is >3MW using time-shifting
• Can offer integration of renewables (solar) and EV charging within a sustainable and resilient energy cluster that can be fault-tolerant
• Can offer some energy price certainty to property owners
• Barclay Tower in New York • 225 kW lead-acid battery • 2 MWh of energy storage
Utility Micro Grids • Electric utilities can use asset-
sited micro-grids to solve many system needs: • Provides voltage and frequency
support for problem feeders • Can provide grid relief during
peak demand periods thus deferring delivery costs
• Utilities can be host sites for developer-run micro-grid initiatives
• Utilities can offer resiliency and backup power to customers located in zones prone to storm outages
• Powerstream/KEPCO micro grid at Penetanguishine, Ont.
• 4MW BESS provides 11 hours of backup to 400 customers including a hospital
• Station located at end of long feeder which exhibits frequent outages from storms
Remote Communities
• Remote communities are located throughout Maine • Most sparsely populated state east of Mississippi • 14 year round offshore communities • High fuel cost, and therefore electricity cost, can deter
economic advancement in these communities
Image: Ken Jorgustin
Microgrids Deployed
Micro Grid Expansion – United States
• Matinicus and Monhegan are the only year-round islands powered by diesel generators in Maine*
• Residents here pay electric rates four times higher than the average Mainer, roughly 65 cents per kilowatt hour.*
• Combination of power delivery and generation methods could deeply discount their rates *Press Herald, Nov. 2015
• Micro Grid enabled critical mission readiness during Superstorm Sandy; only USCG facility to remain in full operation throughout the event in the Storm Affected Area.
• Peak shaving and Micro Grid energy savings fully funded the distributed generation Micro Grid at the facility
• Serves 200 buildings and 2,500 employees including two runways
Costal Demand Response Micro Grid USCG Elizabeth City, NC
• NIBC Fort Detrick Micro Grid was developed as a Public Private Partnership and contracted under a Micro Grid
• NIBC has experienced uninterrupted electric service since 2008 including during PJM wide outages following Superstorm Sandy and record snowfall events
National Interagency Biodefense Campus Micro Grid Fort Detrick, MD
• 40MW of energy produced for 60,000 residents • Supplies heating, cooling, and electricity • Ability to run in island mode as demonstrated during
Superstorm Sandy while the grid was down
Riverbay Cogeneration Micro Grid Bronx, NY
• NYU runs on a Micro Grid • Micro Grid was able to run independently of the standard grid • Thanks to the NYU Micro Grid lights stayed on in and around
Washington Square. • Originally developed in the 1960’s (disclaimer – not a Stantec project)
New York University Micro Grid Manhattan, NY
Micro Grid Expansion in US – New York • New York offered
funding for feasibility studies for municipal Micro Grids.
• Overwhelmed by proposals, the state awarded funds for 83 feasibility studies
Image: NYSERDA
Why Not Disconnect Entirely from the Grid?
Economics and Balance
• Economics is the driving force • Currently a balanced approach decreases the initial capital outlay while
complimenting the existing Grid’s continued operation and reliability
Image: Hitachi
Supplementing and Complimenting “The Grid”
Energy Storage
Energy Storage & Micro Grids– Integral Parts of Grid Reliability and Stability
• Micro Grids when developed in conjunction with renewable sources and energy storage can provide numerous benefits to consumers and utilities • Balancing load against generation (load leveling) • Providing frequency support / regulation • Providing voltage support • Provide “spinning reserve” • Provide grid support in weak areas to defer asset replacement /
investment
Jumpstarting Maine’s Development of Resiliency, Reliability, and Stability
Needs • Ability to generate “across the street”; Micro Grids to date are
predominately ideal scenarios concentrated to Universities, Hospitals, and Military installations.
• Means of generating and collecting income from participants in a defined Micro Grid
• Ability to utilize existing infrastructure to implement a Micro Grid in a defined area agreed to by CMP and MPUC
• Mechanism to compensate utilities for use of infrastructure in defined Micro Grid location; i.e. transmission fee as percentage of generation
• Standard for implementation of Micro Grids agreed to by MPUC for interconnection and operation; i.e. switching to and from Island mode automatically and / or at will
Contributors
Mike Voll Stantec Consulting Sector Leader, Power- Micro Grids & Energy Storage [email protected]
Jonathan N. Traynor Stantec Consulting Mid-Atlantic Lead - Power Division [email protected]
Mark Vilchuck Power Surety Inc. Director - Technology & Project Development [email protected]