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Copyright © Hawaiian Electric Company, HELCO, and SEL 2016
Integrating Synchrophasors and Oscillography for Wide-Area
Power System AnalysisDora Nakafuji
Hawaiian Electric Company
Laura Rogers Hawaii Electric Light Company
Jared Bestebreur, Michael Rourke, and Greg ZweigleSchweitzer Engineering Laboratories, Inc.
Hawaii Electric Light Company (HELCO)
Map data ©2016 Google
50% Renewable Power Regularly Integrated
Challenges With Islanded SystemsSignificant Voltage, Frequency, and Power Swings
PMU Frequency
59.647 Hz
60.014 Hz
60.564 Hz
12:40:00 AM 12:53:20 AM 1:10:00 AM
Renewables Introduce Faster Dynamics
SCADA Misses Information
91.90 kW
62.31 kW
32.72 kW
4:27:00 PM 4:27:20 PM 4:27:40 PM
PMU Real PowerSCADA Real Power
• Post-fault event report is saved to IED’s nonvolatile memory
• Voltage and current measurements are sent to SCADA from IED or remote terminal unit (RTU) every few seconds
Traditional Monitoring and Analysis
IED
What Is an Event Report?
Prefault Data Post-Fault Data
• Currents• Voltages• Digitals
Fault DataIED
Report Analysis Before Software Tools
What Is a Synchrophasor?
Architecture for Data Synchronization
Correlation of Time-Stamped Data Types
• Remote download via communications processor• Local download at substation
Traditional Event Report Collection Systems
Clock
IRIG-BSCADA
Engineering
Communications Processor
Protective Relays
Defense-in-Depth Security Approach
Substation Perimeter
Serial Encryption, User Access Proxy
Switch
WAN
Zone 0
Zone 1
Zone 2
Zone 3
Protective Relays
Communications Processor or PDC
Local Collection for Simplicity
Protective Relays
Managed Ethernet Switch
Protective Relays
Report Collection
Communications Processor
Wide-Area Collection for High-Speed Networks
Substation IED Network
Substation IED Network
Substation IED Network
WAN
Report Collection
Hybrid Collection for Performance and Security
Protective Relays
Protective Relays
Report Collection
WAN
Communications Processor Communications Processor
Substation Substation
Architecture for Streaming Synchrophasors
Substation PMU/PDC Network
Substation PMU/PDC Network
Substation PMU/PDC Network
Web Client
WAN
Central PDC Synchrophasor Archive
Collection Architecture Implemented at HELCO
Control Center
Substation
Event Report DataSynchrophasor Data
WAN
Central PDC Synchrophasor Archive
Event Report Collection and Archive
Protective Relays
Switch
PDC
Communications Processor
Web Client
HELCO Lightning StrikePMU Frequency
59.647 Hz
60.014 Hz
60.564 Hz
12:40:00 AM 12:53:20 AM 1:10:00 AM
IED 1
IED 2
IED 3
59.647 Hz
60.014 Hz
60.564 Hz
12:40:00 AM 12:53:20 AM 1:10:00 AM
IED 1
IED 2
IED 3
Synchrophasors
IED Event Reports
Data Correlation for Added Context
59.647 Hz
60.014 Hz
60.564 Hz
12:40:00 AM 12:53:20 AM 1:10:00 AM
IED 1
IED 2
IED 3
Event Summary Data for Operations
IED Event Report Summary
Event Reports for Detailed Analysis
• Faster analysis of system events• Better understanding of renewable impact on system
during disturbances• Situational awareness for operations
HELCO Benefits
Questions?
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