Brown D SMUD Presentation
Solving Today’s Integration Challenges: Three mini-case studies
SEPA Solar Integration Workshop – David Brown P.E. April 30th 2015
Powering forward. Together.
Three mini-case Studies • Downtown Network Interconnection • Residential High Penetration
• Utility Scale Interconnection Challenges
Macy’s Downtown Network Service
Macy’s Downtown Network Solar - SUNPOWER
Macy’s Downtown Network Solar
Question #1 Situation SMUD has offered Solar Shares to downtown customers from a solar field located in the rural south county, 29 miles away.
Which is the most correct? 1.
There will definitely be significant T&D benefits
2.
There won’t necessarily be any T&D benefits and system losses may increase
3.
Meters will spin backwards for these downtown customers
4.
Their cost for Solar Shares power will be much higher than if these downtown customer installed their own rooftop solar
SMUD Interconnection – Opportunities Map 12/21kV
RENEWABLE PROJECTS ESTIMATED LOW COST INTERCONNECTION BY SUBSTATION CAPACITY (Based on 100% of daytime annual minimum load )
> 5MW ≤ 5MW ≤ 3MW ≤ 2MW ≤ 1MW
Question #2 Situation Additional residential solar installations will result in a local high voltage on the shared secondary and services. Which of the following is the most expensive remedy? 1. Install a dedicated transformer 2. Install a voltage regulating transformer 3. Require smart inverters (Watt/Volt, VAr/Volt) 4. Increase the size of the secondary conductors 5. Have the customers add battery storage
5/6/2015
12
Following Successful FIT with Solar RFO
Rancho Seco Solar Background • SMUD had made significant Solar Shares commitments anticipating a successful Solar RFO • All proposed Solar RFO locations were problematic • A Solar-Thermal project at the Rancho-Seco site had been recently cancelled • Unrestricted interconnection capacity exhausted by prior Feed-In-Tariff (FIT) projects • Bulk system 224MVA 230kV-69kV already running in reverse > 20% of rating
Rancho Seco Solar
Question #3 Situation An additional utility scale solar field is added in a PV saturated area. It has been determined that for about week in the spring and a week in the fall the system doesn’t have enough load to accommodate this new installation’s output. Which is likely to be the most cost-effective remedy? 1. Install battery storage
2. Build a pump storage plant 3. Curtail the plant 4. Have local customers add load 5. Build a flywheel storage plant
Thank You
SEPA Solar Integration Workshop – David Brown P.E. April 30th 2015
Powering forward. Together.
SEPA Solar Integration Workshop – David Brown P.E. April 30th 2015
Powering forward. Together.
Three mini-case Studies • Downtown Network Interconnection • Residential High Penetration
• Utility Scale Interconnection Challenges
Macy’s Downtown Network Service
Macy’s Downtown Network Solar - SUNPOWER
Macy’s Downtown Network Solar
Question #1 Situation SMUD has offered Solar Shares to downtown customers from a solar field located in the rural south county, 29 miles away.
Which is the most correct? 1.
There will definitely be significant T&D benefits
2.
There won’t necessarily be any T&D benefits and system losses may increase
3.
Meters will spin backwards for these downtown customers
4.
Their cost for Solar Shares power will be much higher than if these downtown customer installed their own rooftop solar
SMUD Interconnection – Opportunities Map 12/21kV
RENEWABLE PROJECTS ESTIMATED LOW COST INTERCONNECTION BY SUBSTATION CAPACITY (Based on 100% of daytime annual minimum load )
> 5MW ≤ 5MW ≤ 3MW ≤ 2MW ≤ 1MW
Question #2 Situation Additional residential solar installations will result in a local high voltage on the shared secondary and services. Which of the following is the most expensive remedy? 1. Install a dedicated transformer 2. Install a voltage regulating transformer 3. Require smart inverters (Watt/Volt, VAr/Volt) 4. Increase the size of the secondary conductors 5. Have the customers add battery storage
5/6/2015
12
Following Successful FIT with Solar RFO
Rancho Seco Solar Background • SMUD had made significant Solar Shares commitments anticipating a successful Solar RFO • All proposed Solar RFO locations were problematic • A Solar-Thermal project at the Rancho-Seco site had been recently cancelled • Unrestricted interconnection capacity exhausted by prior Feed-In-Tariff (FIT) projects • Bulk system 224MVA 230kV-69kV already running in reverse > 20% of rating
Rancho Seco Solar
Question #3 Situation An additional utility scale solar field is added in a PV saturated area. It has been determined that for about week in the spring and a week in the fall the system doesn’t have enough load to accommodate this new installation’s output. Which is likely to be the most cost-effective remedy? 1. Install battery storage
2. Build a pump storage plant 3. Curtail the plant 4. Have local customers add load 5. Build a flywheel storage plant
Thank You
SEPA Solar Integration Workshop – David Brown P.E. April 30th 2015
Powering forward. Together.
