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Smart LED Lighting for Power Management in a BuildingAly A. Syed1, Sachin Bhardwaj2, Tanir Ozcelebi2 and Johan Lukkien2

1Distributed System Architectures, NXP Semiconductors / Central R&D / Research, High Tech Campus 32, 5656 AE Eindhoven, The Netherlands

  2Department of Mathematics and Computer Science, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands

Aly.Syed@NXP.com, {s.bhardwaj, t.ozcelebi, j.j.lukkien}@tue.nl,

Introduction

Energy is becoming expensive and electricity providers are coming with different schemes for billing. One model is that a building gets a quota of electric power that it is allowed to use. If the building uses more power than its quota, then a significantly higher price for electricity is charged. This way, electric energy providers can plan their power generation in a cost effective manner.

A building is assigned a power usage quota. This building has two types of rooms, rooms that have a high priority and rooms that have low priority.

The high priority rooms are allowed to use the power according to whatever demand there is at a time, while the low priority rooms are obliged to use the power that is leftover from the quota after the consumption of high priority rooms has been subtracted.

The system in this building takes power consumption in the high priority rooms and adjusts the lighting in the low priority rooms such that the quota assigned to the building is maintained.

Use Case Scenario

Semantic Interoperability

Gateway-KP (GWKP) is capable for updating light information to the SIB and is subscribed for the power consumption data from high priority room. After getting power consumed value from the high priority room it regulates the light output of LED luminaries in the low priority room using no more than the remaining power quota. The GWKP also keeps illumination in the room according to the user preference and activity as much as possible.In case, the power provided to the low priority room is not sufficient to give desired illumination then the lights adjust such that the quota for the building is maintained. GWKP also updates light information on the SIB.

Conclusions

Objective

The major goal of this system is to demonstrate interoperability between two sub systems namely OSAS (TU/e-SAN) and NXP lighting system which are based on different architectures using SOFIA Smart M3 approach.

System Architecture

We developed a power-managed smart LED lighting system composed of various types of embedded devices with different computing and communication platforms, forming a heterogeneous network. The power management information is exchanged between different networks and devices using an ontology-based semantic interoperability architecture, namely Smart-M3. The proposed priority mechanism ensures accurate maintenance of the overall power consumption levels, always keeping it under a given power quota for the building. This behavior is regardless of changing external lighting conditions as the smart lighting system introduced is capable of adjusting light output levels from individual luminaries as well as their power consumption in both LoPR and HiPR.

High Priority Room (HiPR) LED Luminary Features in LoPR and HiPR

Low Priority Room (LiPR) Experimental Results

M-KP SIB

AN

GWKP

Ontologyinterpreter and

governance

Information storage

OSAS framework

OSAS Interpreter for

Ontology support

Smart space

Ontology model

Data format (Resource Description Framework)

Information access (Smart Space Access Protocol)

communication by existing solutions (IEEE 802.15.4, ZigBee, Internet etc.)

P-KP

Power measurement

model

Switch

Automatic light control model

High priority rooms Low priority rooms

Information level

Communication level

KPI forontology support

KPI forontology support

ZigBee linkOSAS linkSmart M3 link

Service level

Illumination model for adaptive lighting

SN

S-KP

SIB

…

…GWKP

…

…

Smart-M3

Internet

Low Priority Room

High Priority Room

Internet

Internet

Internet

LED lamp Light or motion sensor

LoPR

HiPR

M-KP

Inte

rnet

(c)

64 LED Connectors

(d)

zigBee

LEDs

Ethernet connection

Power supply

(a) (b)

zigBee

Power supply Motion detector

(e)

Experimental Devices

Reference

Sachin Bhardwaj, Aly A. Syed, Tanir Ozcelebi, J.J. Lukkien, "Power-managed smart lighting using a semantic interoperability architecture", IEEE Transactions on Consumer Electronics, Vol.57, Issue 2, pp. 420-427, May, 2011.

SN

GWKP

AN

SIB

P-KP

sub_UpdateIlluminationsub_UpdateLOutput

sub_Status

update_Sensor

GWKP: Gateway KPSN : Sensing nodeAN : Actuator nodeSIB : SIB nodeSW : SwitchP-KP: Power KPS-KP: Sensor KPM-KP : Mobile KP

OSAS linkSmart-M3 linkZigBee link

S-KP

sub_AdjustLight

update_Power

M-KPsub_SIB_store sub_SIBdata

SWLight_Command

update_Sensor

HiPR

LoPR

Smart-M3

0

2000

4000

6000

8000

10000

12000

1 2 3 4

Ph

Ql

PlowReq

Test Ph Ql PlowReq

1 8437 3563 24362 2476 9524 129723 5632 6368 78434 9200 2800 2201

Test number

Pow

er (m

illiW

atts

)

Lighting system that adapts to user activity and changes light levelAll lamps individually send their power consumption value to the SIB and periodically update. In case, the change in light output is required then the lamps can be adjusted automatically according to the desired illumination. The sensors and switches are used to maintain the light level in a room according to the preference of a user.As it is a high priority room, the lighting system uses as much power as needed.

(a) System Architecture (b) Subscriptions and update links for the system architecture

(b) Comparison of required and regulated power in LoPR.

(a) Power consumption in HiPR and LoPR based over four tests..

HiPR hardware components are shown in (a) and (b), where (a) is a power measuring light source P-KP and (b) is an S-KP. LoPR hardware components are shown in (c), (d) and (e), where (c) is a sensor node SN (d) is an LED actuator board for AN and (e) is a 36-LED AN luminary.

Features LoPR Luminary HiPR Luminary

Luminary function turned on and off, and its brightness controlled turned on and off, and its brightness controlled

Output update rate 30 updates/second 1 update/secondNumber of LEDs in one luminary 36 3

Power source DC power source AC 220V Power conversion None LED lighting driver with power measurement

Connection USB port ZigBee and InternetMaximum light output from one LED luminary 360 lumens (maximum 10 lumens per LED) 525 (maximum 175 lumens per LED)

Maximum power used by one LED luminary 6486 milliwatts 4500 milliwatts

PlowReq: Power required in low priority room Ph: Power used in high priority roomQl: Remaining power quota for low priority room

0

2000

4000

6000

8000

10000

12000

14000

1 2 3 4

PlowReq

Power Regulated (used power in LoPR)P

ower

mill

iwat

ts

Test number