demand response: and historical perspective and business … · demand response: an historical...
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Demand Response: An Historical Perspective and Business ModelsPerspective and Business Models
for Load Control Aggregation
Shmuel S OrenShmuel S. OrenDepartment of Industrial Engineering and
Operations ResearchpUC Berkeley, California
PSERC Webinar, February 1, 2010
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PSERCA Smart Grid VisionA Smart Grid Vision
C ( C)• Distribution Automation and Control (DAC) systems have potentially major effects on costs, social impacts, and even on the nature of the power system itself, especially as dispersed storage, generation, and customer interaction become more prevalent.
• Homeostatic Utility Control is an overall concept which y ptries to maintain an internal equilibrium between supply and demand. Equilibrating forces are obtained over longer time scales (5 minutes and up) by economic g ( p) yprinciples through an Energy Marketplace using time-varying spot prices.
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PSERCA Smart Grid VisionA Smart Grid Vision
• Faster supply-demand balancing is obtained by employing "governor-type" action on certain types of loads using a Frequency Adaptive Power Energy g q y p gyRescheduler (FAPER) to assist or even replace conventional turbine-governed systems and spinning reserve.
• Conventional metering is replaced by a Marketing Interface to Customer (MIC) which, in addition to measuring power usage multiplies that usage by postedmeasuring power usage, multiplies that usage by posted price and records total cost.
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PSERCA Smart Grid VisionA Smart Grid Vision
Above excerpted verbatim from the abstract of:“HOMEOSTATIC UTILITY CONTROL,” F.C. Schweppe et alIEEE Transactions on Power Apparatus and Systems, Vol. PAS-99, No. 3, , ,May/June 1980 –30 years ago!!!!
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Offered to commercial and industrial customers with load > 500KWOffered to commercial and industrial customers with load 500KW
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Demand Subscription Service
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Southern california Edison, Research Newsletter, 4th Quarter, 198829
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Future Electricity SystemFuture Electricity System
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All Rights Reserved to Shmuel Oren
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All Rights Reserved to Shmuel Oren 36
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Making the Grid Smart
All Rights Reserved to Shmuel Oren 37
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General Observations About Demand ResponseResponse
While today’s metering and control technology is y g gycheaper, technology was never a barrier to implementation of demand responseThe focus has been (as now) on demonstration ofThe focus has been (as now) on demonstration of capability, rather than on developing a business model that will facilitate implementation. h k l k d dThe key elements to making demand response a reality are:A regulatory frameworkg y Institutional structure A sustainable business model that will incentivize customer choice at the retail levelcustomer choice at the retail level
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Economic Paradigms for Demand ResponseResponse
Provide real time prices to retail customersPolitically objectionablePolitically objectionableCustomers do not like and are not used to price uncertaintyWhile RT price response can be automated it still puts the burden on the customerburden on the customer
Treating electricity as a commodity works well at wholesale level but retail customers would rather think of electricity as a service
Provide quality differentiated service based on contracted load control options.Quality differentiated service and optional price plans are
i h i i d i ( i i llcommon in other service industries (air transportation, cell phone, insurance)
Customers have experience with choosing between alternative service contractsalternative service contracts
Customers prefer uncertainty in service rather than uncertain prices
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The Challengeg
Need Business model and economic paradigm for a utility or third party aggregator to bridge the gaputility or third party aggregator to bridge the gap between wholesale commodity market and retail serviceAggregated retail load control can be bid into the wholesale markets for balance energy and ancillary services.Load control through direct device control (thrmostats, airconditioners, water heaters, EV battery charge)
o Intrusiveo Faster response enables higher valued products (e.g. regulation)
Or control of power through the meter with customer dynamic control of allocation to devices in the home.y
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1982‐1990
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Supply Shortage Profile Or Aggregator's Wholesale Offers Profile
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Stratification of Demand into Service Priorities
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Only the last two columns characterizing the shortage cost histogram in the population are needed for price menu design
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Determining the SupplyProbability r(v) Under Efficient Rationing
r(v) = Probability of supplyassigned to a MW with valuation v/hr. Demand Function Supply Reliability
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Deriving the Optimal Price Menu
( ) { ( )}r
r v Arg Max r v p r Find a price finction p(r) such that
rSelf –Selection conditions:
dp v
Efficient Rationing Condition:
( ) ( ( ))r v F D v
( ) 0
vdrv r p r
( ) ( ( ))
0
( ) ( )
( ) ( )v
dp v v dr v
p v p udr u
( )p r0 0
( ) ( )p v p udr u ( )p
F d i i h i i l i dFree parameter determining the minimum valuation served
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Graphical Illustration of Pricing Formulap g
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Discrete Approximation
ff l f d ( )2Efficiency losses of discritization ~ O( )21/N
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Relationship between Priority Service and RT price response
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Modeling Interruptible Service Contract as a Callable Forward Contract (strike price determines priority)Callable Forward Contract (strike price determines priority)
BuyerBuyer SellerForward PriceC ll P iBuyerBuyer
(Selects strikePrice k)
Seller(Can exercise Call)
$k– Call Price
Owns 1 ForwardShort 1 Call
)
Short 1 ForwardOwns 1 Call
OR
Short 1 Call Owns 1 Call1 unit energy
Spot price
Strike price kPayment to Buyer
TimeCurtail.
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Modeling Interruptible Service Contracts with earlyModeling Interruptible Service Contracts with early notification option as a Double‐Callable Forward Contract
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This is like deja vu all over again.j g
‐‐ Yogi Berra62