three-phase active and reactive power control in …€¦ · three-phase active and reactive power...

THREE-PHASE ACTIVE AND REACTIVE POWER CONTROL IN HOME ENERGY MANAGEMENT SYSTEM Bharath Varsh Rao

1. Motivation 2. Three-phase smart home model 3. Smart-home thermal model 4. Smart-home electric model 5. Three phase unbalanced home energy management system 6. Objective functions 7. Chronological control functions and events 8. Results 9. Conclusion and Outlook

AGENDA

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• Changing nature of loads (heat-pumps, electric storage and vehicles • Increase in distributed energy resources (DER’s) - PV systems, micro-wind … • Single or three phased

• Homes and buildings consuming large share of energy. • Increase grid resilience and economic benefit

MOTIVATION

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THREE PHASE SMART HOME MODEL

4 03/06/2019 Souces: Rao, B.V.; Kupzog, F.; Kozek, M. Phase Balancing Home Energy Management System Using Model Predictive Control. Energies 2018


AGENDA

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• Linear single zone models - single family homes • Based on nonlinear models - representing real buildings in Vienna and Salzburg • Part of the project iWPP-Flex

SMART HOME THERMAL MODEL (1/3)

6 03/06/2019 Souces: Esterl, T. iWPP-Flex Projekt Endbericht. Österreichisches Forschungsprojekt FFG-Nummer 848894

• Continuous state space models were discretized with a sampling time step of 15 min

• - Temperature of wall, floor and ceiling • - Temperature of the room • Limits on room and wall temperatures:


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• Input parameters:

• Limits on heat flows into the building:


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• Heat pump is used to provide the heat flow • Single phase heat pump

• - Active power • - Coefficient of performance

• Low-energy and existing house contains on-off heat pump: • Binary variable with 0 for off and 1 for on is used.

HEAT PUMP IN RESIDENTIAL HOMES (1/2)

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• The “pump” in heat pump consists of an induction motor. • Lossless and constant power factor ( )

• Only heating period is considered. and

• Constraints on heat pump active and reactive power limits:

HEAT PUMP IN RESIDENTIAL HOMES (2/2)

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AGENDA

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• Energy balance of electric storage system

• Constraints on soc limits: • Constraints on battery power limits:

ELECTRIC STORAGE CONSTRAINTS

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• Battery is connected to a three phase inverter. • Active and reactive power flows on each of the phases. • Power balance equation:

• The equation becomes nonlinear and non-convex.

THREE PHASE INVERTER CONSTRAINTS (1/2)

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Inverter is only controlled at unity power factor.

• Individual phase powers are represented as follows,

THREE PHASE INVERTER CONSTRAINTS (2/2)

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• Limits on active and reactive powers:

• Power factor is assumed constant with time. • Typical power factor for house hold loads is between 0.90 to 0.95.

CONSTRAINTS ON CONTROLLABLE LOADS

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• Limits of active and reactive power at the grid connection point.

CONSTRAINTS ON GRID CONNECTION POINT

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INPUT DISTURBANCES

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AGENDA

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THREE PHASE UNBALANCED HOME ENERGY MANAGEMENT SYSTEM

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• Improve self consumption:

• Improve user comfort:

• Improve grid support:

• Complete objective function:

OBJECTIVE FUNCTIONS

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OBJECTIVE WEIGHT SCENARIOS

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CHRONOLOGICAL CONTROL FUNCTIONS AND EVENTS

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AGENDA

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SIMULATION PARAMETERS

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IMPROVE SELF CONSUMPTION

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IMPROVE USER COMFORT

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IMPROVE GRID SUPPORT

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• A three phase balancing home energy management system using nonlinear non-convex models.

• Model predictive control scheme was applied to smart home for various extreme objective weight scenarios.

• Analysis was done based on three objective functions. • It was shown that the results reflect the chosen objective weights for each of the three

objective functions. • Grid support maximization objective was illustrated with active and reactive power.

Higher order nonlinear models to closely match the real behavior. Applying the concepts to real large buildings.

CONCLUSION AND OUTLOOK

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THANK YOU! BHARATH-VARSH RAO Scientist Electric Energy Systems - Center for Energy Giefinggasse 2 | 1210 Vienna | Austria T +43 50550-6321 | M +43 664 88256043 [email protected] | www.ait.ac.at

mailto:[email protected]:[email protected]:[email protected]://www.ait.ac.at/

Three-phase Active and Reactive Power Control in Home Energy Management SystemAgendaMOTIVATIONThree phase Smart Home modelAgendaSmart home thermal model (1/3)Smart home thermal model (2/3)Smart home thermal model (3/3)Heat Pump in Residential Homes (1/2)Heat Pump in Residential Homes (2/2)AgendaElectric storage constraintsThree phase inverter constraints (1/2)Three phase inverter constraints (2/2)Constraints on controllable loadsConstraints on grid connection pointInput disturbancesAgendaThree phase unbalanced home energy management systemObjective functionsObjective Weight scenarioschronological control functions and eventsAgendaSimulation ParametersImprove self consumptionImprove user comfortImprove Grid SupportConclusion and outlookThank you!

three-phase active and reactive power control in …€¦ · three-phase active and reactive power...

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