methods for using online and spatial data for energy...
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Methods for using online and spatial data for energy systems
JRC Workshop: Methodologies for energy performance assessment based on location data,Ispra, September 2016
Henrik Madsen, www.henrikmadsen.org
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JRC Workshop – Location Data, JRC, September 2016
ContentsA single sensor (smart meter) (UA, ..)
Several sensors (dyn.)
Occupancy behavior modeling
Modeling and operation of DH systems
Price-based control in smart grids
In all cases location/MET datais used
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JRC Workshop – Location Data, JRC, September 2016
Part 1 Simple non-parametric methods
Typically only data from smart meter (and a nearby existing MET station)
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JRC Workshop – Location Data, JRC, September 2016
Case Study No. 1
Split of total readings into space heating and domestic hot water using data from smart meters
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JRC Workshop – Location Data, JRC, September 2016
Data● 10 min averages from a number of houses
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JRC Workshop – Location Data, JRC, September 2016
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JRC Workshop – Location Data, JRC, September 2016
Splitting of total meter readings
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JRC Workshop – Location Data, JRC, September 2016
Holiday period
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JRC Workshop – Location Data, JRC, September 2016
Robust Polynomial Kernel
To improve the kernel method
Rewrite the kernel smoother to a Least Square Problem
Make the method robust by replacing with
Make the method polynomial by replacing with
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JRC Workshop – Location Data, JRC, September 2016
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Case Study No. 2
Modelling of Thermal Performance using
Smart Meter Data
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JRC Workshop – Location Data, JRC, September 2016
Energy consumption in DK
Consequence of good or bad workmanship (theoretical value is U=0.16W/m2K)
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JRC Workshop – Location Data, JRC, September 2016
Example
U=0.21 W/m²KU=0.86 W/m²K
Consequence of good or bad workmanship (theoretical value is U=0.16W/m2K)
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JRC Workshop – Location Data, JRC, September 2016
Examples (2)
Measured versus predicted energy consumption for different dwellings
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Characterization using Data from Smart Meters
Energy labelling
Estimation of UA and gA values
Estimation of energy signature
Estimation of dynamic characteristics
Estimation of time constants
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JRC Workshop – Location Data, JRC, September 2016
Energy Labelling of Buildings
Today building experts make judgements of the energyperformance of buildings based on drawings and prior knowledge.
This leads to 'Energy labelling' of the building
However, it is noticed that two independent experts can predict very different consumptions for the same house.
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JRC Workshop – Location Data, JRC, September 2016
Simple estimation of UA-valuesConsider the following model (t=day No.) estimated by kernel-smoothing:
The estimated UA-value is
With more involved (but similar models) also gA and wA values can be stimated
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JRC Workshop – Location Data, JRC, September 2016
Estimated UA-values
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JRC Workshop – Location Data, JRC, September 2016
Results
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JRC Workshop – Location Data, JRC, September 2016
Skitse for WEB
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JRC Workshop – Location Data, JRC, September 2016
Perspectives for using data from Smart Meters
Reliable Energy Signature.
Energy Labelling
Time Constants (eg for night set-back)
Proposals for Energy Savings:
Replace the windows?
Put more insulation on the roof?
Is the house too untight?
......
Optimized Control
Integration of Solar and Wind Power using DSM
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JRC Workshop – Location Data, JRC, September 2016
Case study No. 3
Modelling the thermal characteristics of a small office building
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JRC Workshop – Location Data, JRC, September 2016
Parametric Models
A model for the thermal characteristics of a small office building
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Flexhouse at SYSLAB (DTU Risø)
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Data and the first principal component
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A first order model often used for simulation
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Model evaluation of the first order model
Model is not adequate since residuals are not white noise
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Model found using Grey-box modelling (..... using CTSM-R –
http://smart-cities-centre.org/software-solutions/)
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Model evaluation – Extended model
This model is OK, since residuals are uncorrelated (white noise)
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JRC Workshop – Location Data, JRC, September 2016
Case study No. 4
Models for DH Systems
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JRC Workshop – Location Data, JRC, September 2016
Heat Load forecasts – up to 96 h ahead
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JRC Workshop – Location Data, JRC, September 2016
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JRC Workshop – Location Data, JRC, September 2016
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JRC Workshop – Location Data, JRC, September 2016
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JRC Workshop – Location Data, JRC, September 2016
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JRC Workshop – Location Data, JRC, September 2016
Models and Controllers (Highly simplified! - In fact 680 km pipes ...)
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JRC Workshop – Location Data, JRC, September 2016
Prob. constraints Controller set-points
Temp at User
Ambient Air Temp.
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JRC Workshop – Location Data, JRC, September 2016
Observed User Temp.
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JRC Workshop – Location Data, JRC, September 2016
Supply temperature with/without predictive control
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JRC Workshop – Location Data, JRC, September 2016
Savings (Reduction of heat loss = 18.3 pct)
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JRC Workshop – Location Data, JRC, September 2016
Case study No. 5
Models for Occupance Behavior
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JRC Workshop – Location Data, JRC, September 2016
Occupant presence(office building in SF)
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JRC Workshop – Location Data, JRC, September 2016
Markov Chain Models
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JRC Workshop – Location Data, JRC, September 2016
Model simulations
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JRC Workshop – Location Data, JRC, September 2016
Electricity consumption(Collaboration with CIMNE and JRC)
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JRC Workshop – Location Data, JRC, September 2016
Electricity consumption(Data from CIMNE / Barcelona)
(Hidden Markov Model)
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JRC Workshop – Location Data, JRC, September 2016
Case study No. 6
Control of Power Consumption (DSM) using
the Thermal Mass of Buildings
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JRC Workshop – Location Data, JRC, September 2016
Control of Power Consumption
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JRC Workshop – Location Data, JRC, September 2016
The Danish Wind Power Case
In 2015 approx. 42 pct of electricity load was covered by wind power.
For several days the wind power production was more than 100 pct of the power load.
July 10th, 2015 more than 140 pct of the power load was covered by wind power
.... balancing of the power system
In 2008 wind power did cover the entire demand of electricity in 200 hours
(West DK)
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JRC Workshop – Location Data, JRC, September 2016
Energy Systems Integration ●in Smart Cities
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JRC Workshop – Location Data, JRC, September 2016
The Smart-Energy Operating-System (SE-OS) is used to develop, implement and test of solutions (layers: data, models, optimization, control, communication) for operating flexible electrical energy systems at all scales.
Temporal and Spatial Scales
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JRC Workshop – Location Data, JRC, September 2016
Control and Optimization
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JRC Workshop – Location Data, JRC, September 2016
Control and Optimization● Day Ahead:
Stoch. Programming based on eg. Scenarios
Cost: Related to the market (one or two levels)
● Direct Control:Actuator: Power
Two-way communication
Models for DERs are needed
Constraints for the DERs (calls for state est.)
Contracts are complicated
● Indirect Control:Actuator: Price
Cost: E-MPC at low (DER) level, One-way communication
Models for DERs are not needed
Simple 'contracts'
In New Wiley Book: Control of Electric Loads in Future Electric Energy Systems, 2015
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JRC Workshop – Location Data, JRC, September 2016
Direct vs Indirect Control
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JRC Workshop – Location Data, JRC, September 2016
Models
Grey-box modelling are used to establish models and methods for real-time operation of future electric energy systems
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JRC Workshop – Location Data, JRC, September 2016
SE-OS Characteristics
Bidding – clearing – activation at higher levels
Control principles at lower levels
Cloud based solution for forecasting and control
Facilitates energy systems integration (power, gas, thermal, ...)
Allow for new players (specialized aggregators)
Simple setup for the communication
Simple (or no) contracts
Rather simple to implement
Harvest flexibility at all levels in Smart Cities
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JRC Workshop – Location Data, JRC, September 2016
Virtual Storage solutionsin Smart Cities
Flexibility (or virtual storage) characteristics:
– Supermarket refrigeration can provide storage 0.5-2 hours ahead
– Buildings thermal capacity can provide storage up to, say, 5-10 hours ahead
– Buildings with local water storage can provide storage up to, say, 2-12 hours ahead
– District heating/cooling systems can provide storage up to 1-3 days ahead
– Gas systems can provide seasonal storage
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SE-OSControl loop design – logical drawing
58
Termostat actuator
Termostat actuatorDataData
SensorsSensors
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Lab testing ….
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SN-10 Smart House Prototype
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JRC Workshop – Location Data, JRC, September 2016
Forecasting is Essential
Power load
Heat load
Gas load
Prices (power, etc)
Wind power prod.
Solar power prod.
State variables (DER)
Tools for Forecasting:(Prob. forecasts)
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JRC Workshop – Location Data, JRC, September 2016
Case study
Control of Power Consumption (DSM) using
the Thermal Mass of Buildings
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JRC Workshop – Location Data, JRC, September 2016
Data from BPA
Olympic Pensinsula project
27 houses during one year
Flexible appliances: HVAC,cloth dryers and water boilers
5-min prices, 15-min consumption
Objective: limit max consumption
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JRC Workshop – Location Data, JRC, September 2016
Flexibility is activated by adjusting the temperature reference (setpoint)
Price responsivity
• Standardized price is the % of change from a price reference,computed as a mean of past prices with exponentially decaying weights.
• Occupancy mode contains a price sensitivity with its related comfortboundaries. 3 different modes of the household are identified (work, home, night).
Hour of day
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JRC Workshop – Location Data, JRC, September 2016
Aggregation (over 20 houses)
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JRC Workshop – Location Data, JRC, September 2016
Non-parametric Response on Price Step Change
Olympic Peninsula
Model inputs: price, minute of day, outside temperature/dewpoint, sun irrandiance
5 hours
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JRC Workshop – Location Data, JRC, September 2016
Control of Energy Consumption
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JRC Workshop – Location Data, JRC, September 2016
Control performanceWith a price penality avoiding its divergence
● Considerable reduction in peak consumption● Mean daily consumption shift
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JRC Workshop – Location Data, JRC, September 2016
Case study No. 5
Control of Heat Pumps (based on varying prices)
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JRC Workshop – Location Data, JRC, September 2016
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JRC Workshop – Location Data, JRC, September 2016
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JRC Workshop – Location Data, JRC, September 2016
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JRC Workshop – Location Data, JRC, September 2016
EMPC for heat pump with solar collector (savings 35 pct)
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JRC Workshop – Location Data, JRC, September 2016
CITIES software used
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JRC Workshop – Location Data, JRC, September 2016
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JRC Workshop – Location Data, JRC, September 2016
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JRC Workshop – Location Data, JRC, September 2016
Discussion
IT-Intelligent Energy Systems Integration in Smart Societies can provide virtual storage solutions (so maybe we should put less focus on electrical storage solutions)
District heating (or cooling) systems can provide flexibility on the essential time scale (up to a few days)
Gas systems can provide seasonal virtual storage solutions
Smart Cities are just smart elements of a Smart Society
We see a large potential in Demand Response. Automatic solutions, price based control, and end-user focus are important
We see large problems with the tax and tariff structures in many countries (eg. Denmark).
Markets and pricing principles need to be reconsidered; we see an advantage of having a physical link to the mechanism (eg. nodal pricing, capacity markets)
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JRC Workshop – Location Data, JRC, September 2016
Some of the otherDemo-Projects in CITIES
Control of WWTP (with ED, Kruger, ..)
Supermarket cooling (with Danfoss, ..)
Summerhouses (with DC, ..)
Green Houses
CHP
Industrial production
EVs (optimal charging)
.............
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JRC Workshop – Location Data, JRC, September 2016
For more information ...● See for instance
www.henrikmadsen.org
www.smart-cities-centre.org
● ...or contact
– Henrik Madsen (DTU Compute)
● Acknowledgement CITIES (DSF 1305-00027B)