Technologies for Advanced Volt/Var Control Implementation. Integration of Advanced Metering Data

Transcription

1 Technologies for Advanced Volt/Var Control Implementation Integration of Advanced Metering Data

2 Voltage Optimization Objective: Safely move the customer into the lower 5% of the allowed voltage band to save energy Minimum allowed voltage at the meter is 114V Actual meter voltage is typically around 120+V Consumer devices are designed to operate with 108V input voltage Excess voltage results in energy waste! > < % of voltage optimization savings are in the customer s home 2

3 Why AMI Measurement? The only way to know the customer voltage is to measure it! Customer voltage variation is not always furthest from the substation, can move around seasonally, can move around due to new loads, and is affected by intermittent distributed generation. Roughly half of the voltage drop from the substation to the customer occurs between the service transformer and the meter. Use of AMI voltage data along with existing SCADA controls to optimize voltage levels on the network provides a comprehensive view from the customer to the control center and enables management of load variability due to deployment of distributed energy resources. 3

4 A Flexible approach to Optimization AMI based CVR is a flexible solution that adapts not only to your grid but also to your business case. Energy Efficiency - CVR Demand Voltage Reduction Volt/VAR Optimization When run 24/7 it can deliver significant energy savings to your customers through Conservation Voltage Reduction. Turned on just prior to peak, it can reduce peak demand charges while at the same time ensuring reliable service. It flattens the voltage profile and improves power factor while at the same time increasing the opportunity for additional demand and energy savings. 4

5 Edge of Network Applications Calculates circuit-by-circuit savings potential Checks for errors and voltage outliers Enables a continuous improvement process Generates initial bellwether meter set Provide real-time voltage optimization Uses customer voltage measurement Respond dynamically to grid changes Achieve sustainable savings Provide circuit by circuit management Measures actual energy and demand savings Integrates weather and economics into validation Leverages EPRI validated statistical methods Provides feedback into grid efficiency planning 5

6 Planner: Statistically Analyze AMI Data Customer Based Planning Model 1 to 6% 1 to 2% Primary Service Transformer 2 to 4% Secondary 1. Target worst outliers with best fix 2. Fixing the additional points below 116 V would give additional range for CVR. 6

7 Plan: Integrate AMI Data into Planning Software Voltage at Peak Load: Traditional Planning Model Results No visibility of isolated secondary voltage issues Customer Voltages Mapped in Planning Software Customer getting V Wrong meter to be replaced 1 to 6% 1 to 6% 1 to 2% > to 2% > to 4% to 4% > 114 SynerGEE Electric model > 114 SynerGEE Electric model 7

8 Distributed Energy Resource Compatibility I 1 to 6% 1 to 2% V 2 to 4% V=IR+B I Linear Prediction of Customer Voltage 8

9 Advanced Voltage Optimization: Adding DVR to CVR and Volt/Var Slow Voltage Storage Ckt 1 Ckt 2,3 Ckt 4,5,6. All Ckts Water Heater Energy Storage Affect Sequential Circuit Voltage Switching Return to VVO level with no secondary peaks No Customer impact Combined Energy & DSM VVO Existing CVR Demand Management All Ckts 9

10 LTC Regulator Cap Bank Secure Operation Optimized Setpoint Optimized Setpoint Optimized Voltage Range Optimizes setpoint for LTCs and Voltage Regulators Local Control for LTCS and VRs make Raise/Lower decisions Optimized High and Low Voltage settings for Capacitor Banks Local Control for Capacitors make Open/Close decisions Local Control (Raise/Lower) Local Control (Raise/Lower) Local Control (Close/Open) 10

11 Method 2 Method 1 Generating Savings and a CVR Factor Historical data used for off records OFF CVR turned on and left on ON CVR turned on and off to create data (Can be scheduled in EDGE Manager) OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON CVR/VAR OFF CVR/VAR ON 11

12 High Variation Load and Generation Stabilization Stabilizer Stabilizer will manage the integration of high-variable loads/generation into the Voltage Optimization process Stabilizer will optimize the circuit capacity for allowing high variation loads and generation to be compatible with existing circuit loads at the secondary level. Stabilizer will be built to work within existing CVR and various Volt/VAR schemes (override mode) Using real-time AMI voltage data, and substation data, manage the integration of high-variable loads into the voltage optimization process. 12

13 Case Study Midlothian Virginia Pilot at Dominion Virginia Power Precise voltage control on two circuits 6,697 AMI meters Suburban Setting Mix of Residential and Commercial Average of 2.8% savings 2008 Voltage Control Operational Status: OFF 2009 Voltage Control Operational Status: ON 2010 Voltage Control Operational Status: ON & IMPROVED Dominion Virginia Power Pilot Performance 5 Years of CVR Operation Initial Pilot area yielding $292,000 (5,144 MWh) in annualized energy savings for 6,697 customers. Pilot extended to 11 additional sites (80K meters under CVR control) Piloting in rural and dense urban settings. 13

14 Total Benefits Distribution Efficiency Program Benefits Total CVR benefits increase as the Program is implemented across each circuit. Plan Validate Plan Manage Carbon Reduction Fuel Reduction Plan Validate Manage Demand Reduction Plan Validate Manage Not just a one and done, ensures achieved benefits are sustained & new benefits are added as your grid grows. Energy Reduction Validate Manage Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Year 11 Year 12 Year 13 Year 14 Year 15 Sustained Benefit Growth 14