CLOSING THE LOOP ON CONSERVATION VOLTAGE REDUCTION TECHADVANTAGE 2014 JIM GREER, P.E., APPALACHIAN ELECTRIC COOPERATIVE

Transcription

1 CLOSING THE LOOP ON CONSERVATION VOLTAGE REDUCTION TECHADVANTAGE 2014 JIM GREER, P.E., APPALACHIAN ELECTRIC COOPERATIVE

2 ABOUT APPALACHIAN ELECTRIC COOPERATIVE New Market, Tennessee 45,000 member co-op 17 customers/mile 2,520 miles dist line 95 employees 14 Substations 333 MW Winter Peak (14) 207 MW Summer Peak (07) Challenging service area Rural/urban mix with farms & vacation properties

3 ABOUT APPALACHIAN ELECTRIC COOPERATIVE TOTAL = 44,732 Customers 86% Residential (38,612) 14% Commercial & Industrial Weather-driven Peak Demand

4 AEC SERVICE AREA Grainger Co. Bays Mountain Hamblen Co. Jefferson Co. Sevier Co.

5 AMI AT AEC Full AMI system via surgical deployment to target high cost accounts first Required robust network to cover rugged, rural terrain 220 MHz (WAN), 900 MHz (LAN) combination mesh RF system (TUNet); minimal infrastructure required 85% of service area covered with just 1 antenna Systemwide coverage with 2 WAN antennas, LAN devices to backfill at meter level Push based notifications vs. batch; event-driven notifications sent to headend Easily layer in applications like CLVR onto core AMI network to speed ROI 5

6 VOLTAGE MANAGEMENT FOR DR Why is AEC using DR: TVA modified rate structures in April 2011 Moved from an energy-only rate to a demand + energy rate AEC wanted to push voltage as low as possible to shave peak demand and reduce wholesale power cost, but not sacrifice service quality AEC can save $9.03 for every KW reduced 6

7 LEGACY VOLTAGE MANAGEMENT Legacy Voltage Reduction Program Started program in April 2011 Control voltage at substation level with voltage regulators using SCADA Set for flat 2-3% reduction in non-extreme weather Unable to make further reductions/cost savings because of limited visibility Limited confirmation of operation Uncertainty of the voltage level of members at end of line Reliant on customer call-in for low voltage issues 7

8 VOLTAGE CONTROL LIMITS 3% Voltage Reduction Scheme HI Normal LOW (3.0V Bandwidth) 123.0V (+1.5V) (-1.5V) 120.0V V 6.0V Max Pri Drop = 114.0V (Range B Limit) 114.0V 4.0V Trans/Sec Drop = 110.0V Min Serv Volts If down-line voltage readings < 114.0V MUST decrease voltage reduction

9 VOLTAGE CONTROL AREAS 80% of load available for Voltage Control Located on sourceside of line regulators 81% of all customers located on source-side of line regulators Line Regs

10 WHAT IS CLVR? AMI-Enabled CLOSED LOOP VOLTAGE REDUCTION (CLVR) Uses AMI data to create feedback loop for SCADA voltage regulator operation. Dynamically raise/lower voltage to thresholds in real time, maximizing peak shaving ability Automatically prioritizes delivery of sag/swell notifications Integrates with SCADA using DNP 3 protocol Why is AEC using CLVR for DR: Easily integrated with existing SCADA system Provides needed end of line voltage information used in voltage reduction decision process Goal is to implement voltage reduction levels at 4% 10

11 VOLTAGE MANAGEMENT FOR DR How AEC is using CLVR: SCADA control of substation LTC s/regulators Control 80% of load/81% of customers Voltage reduction at bus (Normal 125.5V 7,970V) 1% Option volts (124.3V) (7,890V) 2% Option volts (123.0V) (7,810V) 3% Option volts (121.7V) (7,730V) Continuously monitor down-line voltage readings Use Beckwith LTC/Reg Controls and Advanced Control Systems Regulator Controls to initiate voltage reduction Operating Supervisor responsible for initiating & monitoring voltage control Provides decision support to determine when to trigger DR events CLVR application is currently being applied primarily for demand response to avoid peak demand charge 11

12 CLVR VOLTAGE CONTROL STRATEGY 1. Initiate voltage control on 1 st day of month during predicted peak hour to establish monthly peak demand 2. If future day of month exceeds 95% of established peak demand, initiate voltage control during predicted on-peak times to establish NEW peak demand 3. Continue same strategy, ratcheting peak demand each time. Provides high confidence that actual peak was captured during the month. A learning process for our Operating Supervisors!

13 SYSTEM LOAD PROFILES

14 VR INTERFACE TOTAL SYSTEM LOAD

15 VR INTERFACE

16 VR INTERFACE VR METER MONITOR

17 IMPORTANCE OF A CLOSED LOOP CLVR provides an instantaneous Closed-Feedback Loop to the utility Proactive rather than reactive Continuous live feedback on voltage levels Allows AEC to make quicker, more precise decisions on when to dial voltage up or down for more cost savings 17

18 INTEGRATIONS FOR DR Integration with AMI/SCADA strengthens overall DR capabilities system wide AEC s integration between AMI and SCADA was simple AMI system behaves like a typical RTU Future Integration with OMS 18

19 CLVR RESULTS AT AEC Actual Dec 2013 savings with 3% voltage reduction

20 CLVR RESULTS AT AEC Potential Dec 2013 savings with 4% voltage reduction

21 SUMMARY BENEFITS OF CLVR FOR AEC 1. Reduced demand charges From Example: Additional $15,000 saving for the month of December 2. Very low impact on the consumer 3. Maximizes the benefit of existing SCADA and voltage reduction programs 4. TRUPUSH, event-based notifications increases operational efficiency; Closed-Feedback Loop 5. Provides information to identify deficiencies in the distribution system 21

22 OTHER RESOURCES Other CLVR customers; customer Case Studies Ex: Morristown Utility Systems (TN) White Paper Closed Loop Voltage Reduction, A TUNet Application 22

23 THANK YOU Jim Greer, P.E., Appalachian Electric Cooperative Tammy Zucco, CMO, Tantalus Frank Piscitelli, Area VP Sales, Itron