ste peaking plants
TRANSCRIPT
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Innovative Technology Solutions for Sustainability
ABENGOA
SOLAR
Innovative Technology Solutions for Sustainability
STE Peaking Plants: I. Solar thermal energy II. Thermal storage system, flexibility
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Introduction: Power Management
Power Generation: Baseload Plants vs. Peaker Plants
STE Peaker Plants: Flexibility
Solana (EE. UU.): The World Largest Parabolic Trough Solar Power Plant
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Introduction: Power Management
Energy is generated from myriad sources and delivered to very
different consumers
The power sector is a complex system
The grid operator manages, in real-time, generation and demand
considering:
The characteristics of each power plant:
Efficiency
Fuel type
Operation and maintenance
Energy cost
Grid reliability
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Introduction: Power Management
4
The system operator stacks the power plants’ energy from least to most expensive until the load in met
How is the energy supplied to the grid?
To ensure the most cost-effective energy production
Which is the main goal?
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Introduction: Power Management
Power Generation: Baseload Plants vs. Peaker Plants
STE Peaker Plants: Flexibility
Solana (EE. UU.): The World Largest Parabolic Trough Solar Power Plant
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Power Generation: Baseload Plants vs. Peaker Plants
Baseload plants are always running and don’t need to be flexible, like a nuclear power plant
These plants are necessary because there is always some level of energy consumption, even at night
The demand profile changes throughout the day
Flexible peaking units are always available and allow operators maintain grid reliability, peaking plants
Baseload plants Peaking plants
Constant output Flexible capacity
STE plants can incorporate energy storage systems to operate as a
baseload or peaking plant
The grid demands at the same time constant output and flexible capacity. Therefore, we need different types of plants:
Copyright © Abengoa Solar, S.A. 2015. All rights reserved 7
Introduction: Power Management
Power Generation: Baseload Plants vs. Peaker Plants
STE Peaker Plants: Flexibility
Solana (EE. UU.): The World Largest Parabolic Trough Solar Power Plant
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
STE Peaker Plants: Flexibility
Power block Storage system
In order to operate as baseload or peaking plants, STE power plants incorporate:
Appropriate power blocks
Specific storage system
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
As the grid relies more and more on intermittent
renewable energy resources…
STE Peaking plants: flexibility
Peaking plants provides:
Stability
Flexible capacity
Negligible running cost
CO2 emission free
Long term supply of stable priced peaking electricity
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Introduction: Power Management
Power Generation: Baseload Plants vs. Peaker Plants
STE Peaker Plants: Flexibility
Solana (EE. UU.): The World Largest Parabolic Trough Solar Power Plant
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Solana (EE. UU.): The World Largest Parabolic Trough Solar Power Plant
Thanks to its molten salt thermal storage system, Solana can operate as a peaker plant
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Solana (EE. UU.): The World Largest Parabolic Trough Solar Power Plant
Gila Bend•
Solana Site
Solana:
Located in Gila Bend, in the Arizona desert
280 MW parabolic trough plant
Its molten salt storage system provides up to six hours of full-load capacity
70,000 households supplied with clean energy
430.000 tons of CO2 emissions eliminated each year
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Solana (EE. UU.): The World Largest Parabolic Trough Solar Power Plant
The thermal energy is stored in molten salt insulation system
The sun heats a thermal fluid (HTF) which transfer thermal energy to the molten salts
The storage system provides up to six hours of full-load capacity when there is no sun, in this case at the beginning and at the end of the day
Flexible capacity used to meet load changes before sunrise and
after the sunset
Storage system
Solar field Molten salt storage
system
Copyright © Abengoa Solar, S.A. 2015. All rights reserved
Solana (EE. UU.): The World Largest Parabolic Trough Solar Power Plant
The thermal storage system allows enough flexibility to face changes in the load demand • An example, June to September
Electricity demand (not scaled) Solar irradiation(not scaled) CSP plant generation
Ou
tpu
t M
W
Hour of day
There is no sun but we keep producing by means of the storage
system