© 2000-2013 New York Independent System Operator, Inc. All Rights Reserved.
NYISO Phasor Measurement
Unit Capability Wes Yeomans
Vice President OperationsNew York State Public Service Commission
Power Quality Technical ConferenceDecember 12, 2013
© 2000-2013 New York Independent System Operator, Inc. All Rights Reserved.
Phasor Measurement Units• Monitoring devices called phasor
measurement units (PMUs) measure the instantaneous voltage and current phasors, and frequency at specific locations in the electricity transmission system Voltage and current phasors are parameters
characterizing the transfer of electric power from generation plants to end-user loads
Frequency is the key indicator of the balance between electric load and generation
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Smart Grid Project• Budget: $75,710,733• Timeline: July 1, 2010 – June 30, 2013• Partners: NYISO and New York
Transmission Owners• Equipment: Phasor Measurement
Units, Phasor Data Concentrators, Phasor Measurement Network, Capacitors
• Applications: Enhanced State Estimator, Voltage Stability Monitoring, Situational Awareness (Visualization), Post Analysis
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© 2000-2013 New York Independent System Operator, Inc. All Rights Reserved.
Synchrophasor Applications
• Phasor Enhanced State Estimator• Phasor Enhanced Voltage Stability
Monitor• Post-Event Analysis• Visualization / Situational Awareness
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© 2000-2013 New York Independent System Operator, Inc. All Rights Reserved.
Phasor Enhanced State Estimator
• NYISO State Estimator was augmented to accept SynchroPhasor measurements Voltage magnitudes & angles (220+) Current magnitudes & angles (280+) Frequencies (70+) Line flow Mw & Mvar (400+)
• Selected points are being used by SE• Monitor the actual values against SE
solutions• Phasor Enhanced State Estimator developed
by ABB
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Voltage Stability Monitor• For a given interface VSM provides
Proximity of voltage collapse under real time conditions Proximity of voltage collapse under contingencies
• VSM Program Execution Every 30 seconds after State Estimator run with SE data Every 2 seconds with updated PMU data
• Contingency Selection Process pre-defined set of contingency definitions
every 30 seconds• Initial focus is on NYCA Central-East Interface
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© 2000-2013 New York Independent System Operator, Inc. All Rights Reserved.
Post-Event Analysis• NYISO uses the Phasor Grid Dynamics
Analyzer (PGDA) for off-line analysis of system events (e.g. BPS line tripping, generation trip of 300 MW, etc.) Frequency response Transient voltage recovery Modal analysis (freq. oscillations) Ringdown analysis (dampening) System Stress analysis Validation of system component
response (SVCs, Statcom)
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Replay of System EventsOperators able to replay events and zoom in on any points of interest
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Visualization & Situational Awareness
• PMUs grouped by zones to reflect expected coherent generation response
• Visualization is part of new NYISO Control Center video wall
• Displays / dashboards organized by New York’s electrical load zones, as well as by external neighboring electrical regions
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© 2000-2013 New York Independent System Operator, Inc. All Rights Reserved.
Video Wall Dashboard• New Alarming Capability for New York State
Abnormal oscillation detection Abnormal voltage magnitude & angle Abnormal frequency
• New Alarming Capability for External Regions Abnormal angle differences across external regions Abnormal voltage magnitude Abnormal frequency
• Short Term View (minutes) and Long Term View (hours) for Wide Area Monitoring (WAM) of angle differences of External Regions
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Wide Area Monitoring
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© 2000-2013 New York Independent System Operator, Inc. All Rights Reserved.
Video Wall Dashboard
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© 2000-2013 New York Independent System Operator, Inc. All Rights Reserved.
Scheduled & Forced Outages
• The NYISO coordinates bulk power generator and transmission scheduled outages with Generator Owners and Transmission Owners to meet steady-state “pre” and “post” operating criteria.
• The NYISO directs operating actions to “re-secure” power flows post contingency
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© 2000-2013 New York Independent System Operator, Inc. All Rights Reserved.
The New York Independent System Operator (NYISO) is a not-for-profit corporation
responsible for operating the state’s bulk electricity grid, administering New York’s competitive wholesale electricity markets,
conducting comprehensive long-term planning for the state’s electric power system, and
advancing the technological infrastructure of the electric system serving the Empire State.
www.nyiso.com
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