Transcript Slide 1

Group Meeting – Pepco Holdings, Inc.
July 17, 2014
Objectives
 Use common model and algorithms to:
– Make PV analysis a standard part of:
• Planning
• Operations Monitoring
– Evaluate impact of PV/DER at feeder and
transmission level
2
1. Activities
 Topic A1
 60 Study Circuits
 Build and major validation/correction review complete
 Measurement collection complete
 Device setting collection continuing
 Completed device setting for Voltage Headroom and DA circuits
 Study feeder description
 Short and stiff, long with high impedance, highly loaded, lightly loaded, mix of
different type customers – residential, industrial, commercial, overhead,
underground, feeders with high PV saturation, feeders that are part of a
Distribution Automation scheme that can’t currently operate because of a
large solar farm, and then a grouping of feeders and substations where high
penetration will have an impact on the transmission system.
 Remaining work
 Compare analysis for base case and Voltage Headroom case
3
1. Activities
 Topic A2
 Voltage headroom circuit selected
 Utilizing existing monitoring equipment and equipping a voltage
regulator bank with SCADA communications and control
 Remaining Year 1 Work
 Complete Voltage Headroom design and define test procedure
 Topic A3
 Significant analysis refinement completed
 Running testing analysis using study circuits
 Refining displays and time-series use of measurements and load
data
 Remaining Year 1 Work
 Update and test PV interconnect criteria
 Compare analysis results for new and old interconnect criteria
4
1. Activities
 Topic B4
 Have Forecast, Schedule, Monitor and Adjust (FSMA)
 Running Conservation Voltage Reduction (CVR) using capacitors,
LTC’s and Voltage Regulators
 Forecasting operation
 Comparing against actual results
 Have method for defining load profile/scenarios
 Have control parts of PV complete
 Adding PV to CVR control functionality
 Remaining Year 1 Work
 Compare base case and controller case performance results
5
2. Accomplishments
 Accomplishments
 Held on site training and analysis code feedback
with PHI PV Group and Planners
 Completed model builds and model build checks
for 60 study circuits
 Collected circuit and load measurements for
analysis
 Time-series load measurements set for automated
attachment to all circuits
 Time-series circuit measurements set for automated
attachment to Voltage Headroom and Autoreconfiguration scheme circuits
6
3. Roadblocks
 Model correction and validation
 Critical part of making PV analysis a standard part
planning and operation management
 Taking more time to complete than planned
 Breaking up into two parts:
 Initial model-build, automated corrections
 Main work for this is complete. Plan to continue to refine as
this is used over the next 6 months
 Manual corrections
 Need to simplify collection and automated use of corrections
made by engineers as a part of running analysis on circuits
 This will be the model build focus for the next 6 month
7
4. Lessons Learned & Questions
 Lessons Learned
 Questions for the DOE
8
PV Hosting Capacity Analysis
Existing Feeder
Classify circuits in terms of how much PV can
be added without violating operating criteria
Analysis: Phase balance, Cap Placement, Voltage
Regulator Placement & Settings, Check
protection/coordination
Quantify: Improvement cost, Feeder performance impact,
PV hosting impact
Optimized Feeder
Run optimized feeder setup to include:
Voltage Head Room Configuration
Autonomous Control
Central Control
Quantify: Improvement cost, Feeder performance impact,
PV hosting impact
Pilot Feeder Instrumentation
• Existing Monitoring
PV Systems. With
480 V monitors
Pole-Mount
Monitors
10
Pilot Feeder Instrumentation
• EPRI Pole Mount voltage and irradiance monitors
installed March 2012
11
Pilot Feeder Instrumentation
• To be installed
INSTALL
SCADA
Communications on
Regulator
PV Systems. With
480 V monitors
Pole-Mount
Monitors
12
Pilot Feeder
• Voltage Regulation zones
Zone 4
Zone 2
Zone 3
V. Reg.
V. Reg.
V. Reg.
PV
Systems.
Zone 1
13
PV Overvoltage at Low Load
• High voltage occurs
at PV systems in
Zone 2 during min
load
128.5
Voltage Plot to PV System #1
Voltage (120 V Base)
128
127.5
127
126.5
126
125.5
125
124.5
124
123.5
0
5
10
15
20
25
30
Distance from Substation (1,000 ft)
14
Min Load Feeder Profile
129
Voltage Plot by Voltage Regulation Zone
128
PV Site Overvoltage
Voltage (120 V Base)
127
126
125
Zone 1
Zone 2
124
Zone 3
123
Zone 4
122
121
120
0
10
20
30
40
50
60
70
Distance from Substation (1000 ft.)
• PV penetration limited by high voltage during
min load, when voltage profile is relatively flat
15
Min Load Feeder Profile
126
Voltage Plot by Voltage Regulation Zone
Voltage (120 V Base)
125
124
Zone 1
123
Zone 2
Zone 3
122
Zone 4
121
• Reducing
voltage in
zone 2 solves
overvoltage
problem
without
creating low
voltage based
on model
predictions
120
0
10
20
30
40
50
60
70
Distance from Substation (1000 ft.)
• SCADA control of regulator allows for manual
reduction of voltage for demonstration of
concept
16
PV Operations Management (FSMA)
• FSMA: Forecast, Schedule, Monitor and Adjust
– Use for:
• Operations Monitoring
• Planning and control simulation
– Currently running coordinated control
• LTC’s, voltage regulators and capacitors
• Just added PV as controllable devices
• Simulator
– Separate copy of Dew that uses same model used
for control, to play the role of the system
17
Model-Based Simulator
 Use simulator to:
– See system response to
control, device state and
load change
– Test & develop control
– Test & develop display
 User can set:
–
–
–
–
Load points/curve
Capacitor states
Voltage regulator states
PV inverter control
 FSMA Control
– Can be run against simulator
or real system
18
PV Operations Management (FSMA)
 FSMA
– Control can be run
against simulator or real
system through
connection to SCADA
19