Water Production and Distribution Real-Time Energy ... · Water Production and Distribution...
Transcript of Water Production and Distribution Real-Time Energy ... · Water Production and Distribution...
Water
Production
and
Distribution
Real-Time
Energy
Management
AWWA DSS
September
2009
Presentation – Table of Contents
I. Project IntroductionA. Project OverviewB. Optimization Project DriversC. Initial Feasibility Study Analysis
II. Detailed Design of EM&OA. System Configuration and BenefitsB. HAZOP Meetings and Constraints C. Hydraulic AnalysisD. Feasibility Study and Savings Review E. EMS Software Design Specification F. SCADA / HMI Interface & IT Design
III. ImplementationA. Implementation Plan/ScheduleB. Savings Review and ROI
Gwinnett EM&O Project Overview
• Gwinnett County Department of Water Resources
◦ Energy Management and Operations Optimization
– CH2M HILL, Inc.
– Derceto, Inc. USA
• Feasibility Study: Nov 2006 – Feb 2007
• Detailed Design: Nov 2008 – Apr 2009
• SW Configuration /FAT: Apr 2009 – Jun 2009
• Field Installation/Test: Sep 2009 – Nov 2009
• System Savings Starts: Nov 2009
OPTIMIZATION PROJECT DRIVERS
1. Rising Energy Costs
- (Second largest cost behind labor, GCDWR ~32% increase in 1 year)
2. Must manage energy cost in real-time rate environment
- GCDWR on GP day ahead real-time hourly pricing
3. Need to reduce energy use (and GHG emissions)
- 85% Energy Use is Pumping - Manage pumping for best efficiency.
4. Must maintain and improve Water Quality
- Improve management of tank turnover
5. Need to operate more consistently to best utilize & protect assets
- Utilize holistic optimizer that will not breach system constraints
6. Need to minimize water waste
- Utilize optimization tool with demand prediction, and mass balance approach that adapts and to changing conditions in real-time allowing more efficient management production and distribution.
Typical Power Use in a Water System
Backwash, 5%
High Zone Pumps, 21%
Main Zone Pumps, 37%
Raw Water Pumps, 31%
Other (HVAC, Lighting), 6%
89 %+ of Water System Energy Use is in PumpingEnergy Costs Typically 2nd Behind Labor20 % of all energy used in California is Water Pumping50 % of all energy use in Dallas, TX is Water Pumping
Key Cost Reduction Techniques
• Moving Energy (kWh) in Time *
• Reducing Demand Charges
(kW) *
• Generating Efficiency Gains
◦ Using most efficient
combination of pumps and
running them
• Selection of lowest production
cost sources of water
• Selection of lowest cost
transport path for water
6
Pump
lifecycle costs
Solving the Energy Equations
• Numerically impossible to solve, but the following techniques have been attempted
◦ Localized optimization at each pump station using profiling or time triggers typically via PLC
◦ Expert Systems using cascading rules
◦ Advanced techniques using Genetic Algorithms (GA)
◦ Multi-Objective Polynomial Systems (MOPS)
◦ Dynamic Programming with Stochastic analysis
• All above make considerable assumptions and do not achieve optimality, operate as advisory, and require significant input.
• In 2001 AWWA report said “the market is waiting for an off-
the-shelf solution”
What will Gwinnett EM&O System do?
• Interfaces directly to existing SCADA with minimal equipment, instrumentation or hardware changes
• Operational tool to schedule pumps/valves to achieve lowest overall cost (without breaching constraints)
• Solves mass-balance first (i.e. must deliver water)
• Aims to minimize costs of energy (best use of off-peak rates)
• Aims to maximize energy efficiency of pumps (BEP)
• Has shown to improved water quality by managing turnover
• Runs in real time – Like an autopilot
• Recalculates schedule (next 24-48 hours) every 1/2-hour, adapting to changing conditions of the day
EM&O SystemWill Take Advantage of Real-Time Energy Pricing
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Scenic East Energy Usage ComparisonPeak Part Peak Off Peak
takes max advantage of off peak rates
EM& O Benefit – Energy Load Shifting
Derceto installed
EBMUD
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5 MW Reduction
WaterOne
EM& O Benefit – Peak kW Reduction
EM& O System – Targets Highest Efficiency
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Telemetry Points Paper Curve (1 pump)
Paper Curve (2 pumps) Scaled Curve (1 pump)
Scaled Curve (2 pumps) Scaled Efficiency Curve (1 pump)
Scaled Efficiency Curve (2 pumps) Series8
EM& O – Chooses Efficient Pump Combinations
led to a 8% energy reduction to move the same volume of water
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Efficiency Comparison Total Energy Usage v Volume of Water Moved
2002 - 2003
2003 - 2004
2004 - 2005
2005 - 2006
Before AQUADAPT
After AQUADAPT
EBMUD
EM&O – Pumping Efficiency Gains
GCDWR - Feasibility Phase Analysis
• Studied Historical Operations In Detail
◦ Historical Energy Bills
– Understand current and available tariffs and
◦ SCADA System Information
– Understand sources , storage and demands on system
– Study system pumps, efficiencies, and constraints
– Identify flows, pressures, and levels for study period
◦ Build calibrated model of exactly how system operates
• Selected strategies for improvements
• Scale savings for a year
• Estimate Costs of Installation
• Evaluate business case / projected ROI for Optimization
SC to Lanier Raw Water Historical Summer Operation
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Raw Pumping – AQUADAPT Summer Alt 1
SC to Lanier Raw Water Summer Operation
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Derceto Raw Water Storage Min/Max Raw Lanier Storage
Raw Pumping –AQUADAPT Summer Alt 2
SC to Lanier Raw Water Historical Summer Operation
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Derceto Lanier FP Flow Rate Historical Lanier FP Flow Rate Day Ahead Price
Derceto Lanier CW Storage Historical Lanier CW Storage Min/Max CW Storage
Lanier FP Flow & CW Storage – AQUADAPT Summer
II. EM&O DETAILED SYSTEM DESIGN
EM&O - System Interface
Distribution
Mains/Pipes
Reservoirs/Tanks
PumpPump
PumpPump
Pump
Pump
Central SCADA Control System
Acts like an autopilot - adapting for changing conditions every 30 minutes
Pressure
Zones
Elevated
Storage
Raw & Treated
Water Facilities
Pressure
Zones
Key Aquadapt Modules
Water Utility SCADA System
PC on LAN
Application Manager
218
PC on
LAN
Dashboard
210
OPC
Current day / real-time
Data Cleaner
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SCADA Interface
203
PC on
LAN
Operator Panel
201
Operations Simulator
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Hydraulic Model
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Primary Database (Live Server)
Backup Database
EM& O -HAZOP Meeting & Constraints
• Hazards and Operability (HAZOP) Workshops
• HAZOP Summary
• Constraints
◦ Reservoir operating levels
◦ Pressure constraints
◦ Pump station constraints
◦ Valve constraints
◦ WFP constraints
◦ Other constraints
◦ Other modes of operation
• Fill Valves Recommendations
Production Reservoirs Constraints
Reservoir Min Level (Ft) Max Level (Ft)
Lanier Raw Water 16 19
Shoal Creek Raw
Water
5 (2) 27
Lanier Clearwell 1 & 2 11 24
Lanier Clearwell 3 & 4 6 19
Lanier Clearwell 5 26 39
Shoal Creek Clearwells 15 (8) 28
• Clearwells historically operated above min level
Pump Min Runtime Constraints
Pump Station Min Runtime
(hrs)
Lanier Raw Water Pumps 4
Shoal Creek Raw Water to Shoal
Creek
4
Shoal Creek Raw Water to Lanier 4
Other pumps 0.5
•Soft constraint or hard constraint
WFP Flow Rate Change Example
EM& O - HYDRAULIC MODEL ANALYSIS
• Hydraulic Model
◦ AQUADAPT uses EPANet hydraulic model
◦ Extract physical data from model
◦ Extract calibrated pump curves
• Study SCADA pump performance data
• Analyze Quality of Pump Curve Data and
recommend pump testing as necessary
Example Calibrated Pump Curve
Pump Efficiency Improvements Example EBMUD
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EBMUD Pump Efficiency Improvements, 2003-2008
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Mean Post-Aquadapt
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Pump Efficiency Improvements Example EBMUD
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EBMUD Aquadapt Pump Efficiency Improvements by Original Efficiency, 2003-2008
GCDWR PumpsEfficiency Improvements Analysis
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Estimated Efficiency Improvements - GC DWR
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EM& O – SW DESIGN SPECIFICATIONS
• Optimization Scope
◦ Facilities included in EMS
◦ Facilities excluded from EMS
◦ External connections
• Operator Interface
◦ Configuration
◦ Example Screen shots
GCDWR Operator Panel – RWPS
GCDWR Operator Panel –Lanier North High Service Pumps
GCDWR Operator Panel –Lanier Central High Service Pumps
WQ & Storage Management
Dashboard – Water System Performance
Dashboard – Pump Performance
Reference Project – Eastern MWD
• 4 Operational Subsystems - Moreno Valley,
Perris, Sun City/Murrieta and East Valley
• 80 Tanks
• 70 Pumping Plants
• 5 Water Treatment Plants
• $2.5M energy spend
• 60 MGD peak summer
daily demand
• Annual Savings = 10% Stage 1 to 15% stage 2/3
• 2007 CA NV AWWA Energy Management Award
GCDWR Operator Panel – Energy Price Chart
GCDWR EM&O Savings Summary and ROI
EM&O FEASIBILITY STUDY – SAVINGS SUMMARY
• Initial study did not consider efficiency improvements or water treatment costs savings.
Total Energy Cost (12/05 – 11/06) $ 4.6 M
Energy Bill Amt Under RTP at WTP and RWPS $ 4.0 M
Energy Standard Bill $ 2.6 M
Projected Savings on Incremental Energy $ 215K (L) $ 225K (H)
Project Savings (%) on Incremental Energy 10.8% 11.3%
EM&O FEASIBILITY STUDY – SAVINGS REVIEW
• Energy pricing
◦ Higher prices as well as higher differential from peak
to off-peak
• Constraints
◦ Increased flexibility of changing WFP flow rates
◦ Lower usable volume at Lanier Raw Water
Reservoir
• Lower demand with water restrictions
• Efficiency Improvements estimated at 8% (use 4%)
• Overall Feasibility Savings still valid
EM&O DETAILED DESIGN - Savings Review
• Original Projected ROI of 32 months
◦ Projected energy Cost Increase 32% Since Study
◦ Revised Projected ROI of 25 months
AnnualEnergy Bill Savings Type $ Savings % Savings
$4.6 M Load Shifting $ 235K 5.1%
Efficiency Gains $ 160K 4.0%
TOTAL $ 395K 9.1%
Annual Energy Bill Savings Type $ Savings % Savings
$6.072 M Load Shifting $ 300K 3.5%
Efficiency Gains $ 160K 4.0%
TOTAL $ 460K 7.5%
EM&O Implement Plan/Schedule Milestones
• Software License purchase (04-AUG-09)
• Transdyn DYNAC SW Upgrade (31-AUG-09)
• SCADA Mods for EM&O Design (6-8wk,15-OCT-09 )
• Derceto Onsite Start-Up & Training (6wk,28-SEP-09)
• EM&O Online & Fully Operational (15-NOV-09)
• Other factors
EM&O Implementation Plan Key Dates
Task Anticipated Schedule
Software License and Support Proposals and
Contracts Negotiation
Feb 2009
Begin Phase 3 AQUADAPT Implementation Mar 2009
Begin SCADA System Interface Work Feb 2009
Final Design Report Mar 2009
Operator Interface Road-Show & Review Apr 2009
Completion of Aquadapt FAT Jun 2009
Develop and Factory Test Transdyn Interface Aug 2009
AQUADAPT Installation on DWR AQUADAPT
Servers
Sep 2009
Field Test/Verify Aquadapt/SCADA Interface Sep 2009
On-site installation and training Oct 2009
Complete Derceto Aquadapt System Delivery Nov 2009
Derceto AQUADAPT Utility Case Studies – USA
Energy Management InstallationsTotal Utility Population
Served
Annual Savings(US$)
Energy Cost Savings(%)
Annual CO2 Reduction
(Ton)
East Bay Municipal Utility District, Oakland CA (2004)
1.3 M $370k 13% 800
Eastern Municipal Water District, Perris CA, Stage 1 (2006)
0.6 M $125k 10% 300
Eastern Municipal Water District, Perris CA, Stage 2 (2007)
0.6 M $150k 15% TBA
Washington Suburban Sanitary Commission, Laurel MD (2006)
1.7 M $775k 11% 4,500
WaterOne, Kansas City KS (2006) 0.4 M $800k 20% 4,800
Region of Peel, ON (2009)*
1.1 M ~1M+* 16% TBA
Gwinnett County, GA (2009)* 0.4 M ~$460k* 10% TBA
* Factory Tests Complete – Projects being installed now
Questions?
• Brian Skeens, CH2M HILL
◦ 678-530-4327
• Wes Wood, Derceto, Inc.
◦ 770-995-7921
• Neal Spivey, Gwinnett County DWR