Synchrophasor Solutions Deployment at PG&E Off-Line Analysis
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1 Synchrophasor Solutions Deployment at PG&E Off-Line Analysis Vahid Madani - PG&E Manu Parashar - ALSTOM Grid October 24, 2013
2 Outline Offline Engineering Applications at PG&E Post Event Analysis (May 30 th Event) Dynamic Performance Baselining Dynamic DTS and Historical Playback Linear State Estimator (LSE) 2
3 M & P Class WECC or other external entities (Redundancy not shown) Engineering Environment 60 phasors/s EMS Applications RAID DAS RAID RAID DAS Server (PP) Interface P120 and event outcome data RVII Ancillary PDC Rugged Environment EDC Platform Engineering Applications Rugged Environment EDC Platform P (120) & M (60) phasors/s Authentication PG&E Active Directory Other Subs EMS Environment 60 phasors/s EMS SuperPDC Historia RAID n Other Utilities Citrix (Access) M60, P60 (2 ASDU,1 plus 1 - ), Multicast, {P120 option available} Network M60 (2 ASDU,1 plus 1 - ) Multicast Other PG&E Internal users Engineering Environment Post Event Other Analysis Subs PMU Real-Time Voltage Instability Monitoring PMU Linear State Estimator (LSE) Fault Location -M class not to exceed 60 phasors/s. - P class 10 to 120 phasors/s not-filtered. Existing Gateway Cyber (Remote Cyber (CIP) (CIP) Access) PDC Function Substation / Aggregate Site PDC M60 and P120 phasors/s M and P Class M & P Class Multi-function PMUbased device M60 and P120 phasors/s Cyber (CIP) M & P Class PMU M & P class SSD 120 M & P class P120 Class LAN Historian RAI D DFR (as needed) Substation level applications and Visualization Substation State Estimator
4 Offline Engineering Analysis Use Cases Leveraging WAMS in Operations Planning Post Event Analysis Dynamic Model Validation Baselining Compliance Monitoring Quicker post-mortem analysis. Sequence of events & root cause analysis. Dynamic model verification. Generator model calibration. Load characterization. Assess dynamic performance of the grid. Steady-state angular Measurements System and asset performance analysis System disturbance impact measures Primary frequency (governing) response. Power System Stabilizer (PSS) tuning Synchrophasor benefits for Post-Event Analysis Phasor data are also valuable for investigation of grid disturbances, improving both the speed and quality of analysis. In the case of the 2007 Florida blackout, NERC investigators used phasor data to create the sequence of events and determine the cause of the blackout in only two days; in contrast, lacking high-speed, timesynchronized disturbance data it took many engineer years of labor to compile a correct sequence of events for the 2003 blackout in the Northeast U.S. and Ontario. NERC RAPIR Report, P4
5 Post Event Analysis May 30 th, 2013 Event PhasorPoint Controller Briefing - 27 May 2013
6 Overview of May 30, 2013 Event 2000MW Automatic Gen drop Celilo-Sylmar DC DC Intertie Intertie restarted Frequency recovered Series Capacitors bypassed Series and Shunt Capacitors inserted 6
7 Time of Event (22:55 22:59 UTC) 2000MW Gen drop Celilo-Sylmar DC Intertie DC restarted Intertie Series and Shunt Capacitors inserted 7
8 Time of Event (23:00 23:12 UTC) Series Capacitors bypassed Shunt Capacitors removed 8
9 Ringdown Analysis PDCI block/restart Oscillation mostly at 0.38Hz mode Using HTLS algorithm. 5 samples/second. Sorted by proprietary index (RI). First voltage swing not considered. 9
10 Ringdown Analysis PNW Generation Drop Damping of 0.38 Hz improves Using HTLS algorithm. 5 samples/second. Sorted by proprietary index (RI). First couple voltage swings not considered. 10
11 M and P Class Data Frequency M Class Data P Class Data Time
12 Spectral Estimation M-Class Phasor reported once every cycle 60 phasors/sec. More accurate phasors. Local and inter-area modes Unknown dynamics No information here! Frequency axis shown up to 24Hz. 12
13 Spectral Estimation P-Class Phasor reported once half cycle 120 phasors/sec. Double freq. resolution as M-class. Captures faster dynamics more high frequency content. Local and inter-area modes Unknown dynamics MORE unknown dynamics No information here! Not available in M-class data Frequency axis shown up to 48Hz. 13
14 Baselining Dynamic Performance PhasorPoint Controller Briefing - 27 May 2013
15 Dynamic Performance Baselining Questions we are looking to answer are: What oscillatory modes are we seeing in our system (governor, inter-area, local, forced, etc)? Where (i.e. location) are we seeing these oscillatory modes and their typical damping and amplitude (MW, mhz, etc). When are we seeing dangerous oscillations (i.e. outliers)? How are these correlated with control actions (i.e. MW flows)?
16 Dynamic Performance Baselining Example Histogram of observed modes (48 hour dataset)!
17 Dynamic Performance Baselining Example Focus on Sub-band ( Hz)
18 Dynamic Performance Baselining Example Locus of particular oscillatory mode (to identify outliers) Outlier Excursions (i.e. problematic events) AMPLITUDE (MHZ) DAMPING RATIO (%)
19 Dynamic Performance Baselining Example Mode amplitude trends! Large Amplitude Oscillations Legend by Locations
20 Dynamic Performance Baselining Example MODE FREQUENCY Spectrogram of mode trends over time. Filtering Parameters TIME
21 Dynamic DTS and Playback Training Environment PhasorPoint Controller Briefing - 27 May 2013
22 Dynamic DTS and Historical Playback 22
23 LSE Application Network model from EMS PMU data OpenPDC Breaker status(ems) Static database (Read once when LSE starts) Real time database Control Center Topology Processor Control Center LSE LSE output to EMS
24 LSE Test In EMS Environment
25 LSE Test In EMS Environment
26 Framework Parallel State Estimator State Estimator Network model (without PMUs) SCADA (with PMUs) Network model (with PMUs) Compare both Solutions Parallel State Estimator
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