PMU Emulator for Power System Electromechanical Dynamics Simulators

Transcription

1 PMU Emulator for Power System Electromechanical Dynamics Simulators Evangelos Farantatos, Mahendra Patel EPRI Param Banerjee, Anurag Srivastava Washington State University NASPI WG Meeting Albuquerque, NM April 25, Electric Power Research Institute, Inc. All rights reserved.

2 PMU Measurements vs Phasors from Dynamic Simulations Phasor values obtained from dynamic simulation tools may differ from synchrophasors measured by PMUs in the field How a PMU works: Analog signal sampling - A/D Conversion Digital filtering magnitude attenuation & phase offset Phasor estimation algorithm e.g. DFT window length - P & M class PMUs Electric Power Research Institute, Inc. All rights reserved.

3 PMU Emulator PMU Emulator: interfaced with power system dynamics simulators, and produces simulated synchrophasors taking into account PMUs internal signal processing Dynamics Simulation Software (PSS/E, PSLF, TSAT etc) Simulated Phasors PMU Emulator C Synchrophasor Application Proof-of-concept software Electric Power Research Institute, Inc. All rights reserved.

4 PMU Emulator - Algorithm Point On Wave based (POW) compensation POW signal reconstruction Application of phasor estimation algorithm and filters on reconstructed signal Reported synchrophasors time stamped at the center of the data window Electric Power Research Institute, Inc. All rights reserved.

5 Demonstrating Results Voltage Phasors M-Class - 15 cycles window P-Class - 6 cycles window Voltage Magnitude (p.u.) PMU (15 cy, M class) Voltage Magnitude (p.u.) PMU (6 cy, P class) PMU Emulator (6cy, P class) Voltage Magnitude Error (%) 1 5 Time (sec) Voltage Magnitude Error (%) 1 PMU Emulator (6cy, P class) 5 time (s) 5 5 Voltage Phase Angle (deg) -5 PMU (15 cy, M class) Voltage Phase Angle (deg) -5 PMU (6 cy, P class) PMU Emulator (6cy, P class) Voltage Phase Angle Error (deg) 4 2 PMU Emulator (6cy, P class) 2 1 Time (sec) time (s) 218 Electric Power Research Institute, Inc. All rights reserved. Voltage Phase Angle Error (deg)

6 Demonstrating Results Current Phasors M-Class - 15 cycles window 4 4 P-Class - 6 cycles window Current Magnitude (p.u.) PMU (15 cy, M class) Current Magnitude (p.u.) PMU (6 cy, P class) PMU Emulator (6 cy, P class) 15 Current Current Phase Magnitude Error (%) Angle (deg) Time (sec) PMU (15 cy, M class) -5 Current Magnitude Error (%) Current Phase Angle (deg) time (s) PMU Emulator (6 cy, P class) PMU (6 cy, P class) PMU Emulator (6 cy, P class) -5 6 Current Phase Angle Error (deg) 1 5 time (s) Time (sec) 218 Electric Power Research Institute, Inc. All rights reserved. Current Phase Angle Error (deg) 1 PMU Emulator (6 cy, P class) 5

7 PMU Emulator Use Cases- Model Validation Simulation Framework Typical Practice Proposed Practice Simulation Framework Model Parameter Estimation Use of PMU Emulator in Model Validation PMU Emulator Model Parameter Estimation Electric Power Research Institute, Inc. All rights reserved.

8 PMU Emulator Use Cases- Model Validation - Example Parameter estimation of generator exciter model IEEE T1 Parameter estimation with and without PMU Emulator for different PMU settings Electric Power Research Institute, Inc. All rights reserved.

9 PMU Emulator Software Also developed scripts for dynamic simulators (TSAT, PSS/E etc) to generate PMU Emulator input files (simulated voltage phasors and power) with the required format Electric Power Research Institute, Inc. All rights reserved.

10 Benchmarking PMU Emulator with Hardware PMU PMU Emulator Electric Power Research Institute, Inc. All rights reserved.

11 PMU Emulator Vendor PMU Library Objective: Include in the PMU Emulator a library of commercial PMU models PMU vendors approached Required information is proprietary and requires NDA Requested information sample Sampling frequency of the point of wave signal Transfer function of antialiasing filter Down sampling frequency, if any Length of the data window used for single phasor estimation FIR filters used Lengths of the FIR filters used (e.g. 8 cycles) Electric Power Research Institute, Inc. All rights reserved.

12 Next Steps Tech Transfer: Case Studies Vendor Engagement: Collaboration with vendors for implementation of PMU Emulator in commercial platforms Electric Power Research Institute, Inc. All rights reserved.

13 Together Shaping the Future of Electricity Electric Power Research Institute, Inc. All rights reserved.