FIDVR Workshop UpdateNERC Load Modeling Task Force (LMTF) Formation

Ryan D. Quint, Ph.D., P.E.Staff Coordinator – SMS, SAMS, LMTFPlanning Committee MeetingDecember 2015

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• Technical Workshop on Fault Induced Delayed Voltage Recovery & Dynamic Load Modeling September 30-October 1 in Alexandria, VA Co-sponsored by NERC and DOE ~100 participants Workshop Materials (LINK)

Workshop Overview

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Key Takeaways

Revisions to Phase (no stalling) 1 model will further improve model behavior

Recent testing and analysis work driving changes for Phase 2 (stalling)

• Current State of Load Modeling Explicit representation of end-use loads is now essential for reliability studies Composite Load Model (CMPLDW/CMLD) represents current state-of-the-art

in dynamic load modeling capability This is an evolving model, with planned improvements and advancementso Extensively used by GE PSLF users in West, used in thousands of simulationso Gaining ground in EI with PSS®E users, NERC supporting further adoption in EI

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• Fundamentals Physics of stalled residential AC units now well understood, can be modeled. Continued need for info on compressor load in stopped, low speed, and

restarting conditions. Current focus is on understanding the propensity of populations of motors to

stall (or not); understanding and ability to model is close at hand.

Key Takeaways

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• Manufacturing Perspective End-use load technology rapidly evolving loads with advanced controls Future loads will be connected through power electronic interface

Key Takeaways

Need unified communication between industries – share needs and requirements

Manufacturing community eager to hear from utility experts – what are the grid’s needs?

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• Load Model Data Composite Load Model explicitly models range of load behaviors, accounts

for distribution systems that connect loads to bulk grid.

Key Takeaways

Default data sets available in WECC, need similar data sets for EI (and ERCOT)

WECC has years experience developing and using CLM o Full adoption, growing

maturity, systematic modeling, open source tools.

Need similar support and engagement for PSS®E users (EI, ERCOT) o Robust implementation and

model initialization

*Load Model Data Tool (LMDT), Pavel Etingov, PNNL.

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• Field Measurements Field measurement data instrumental in understanding FIDVR in actual

power systems; helped direct model improvements for reproducing events Useful in understanding behavior of changing populations of end-use loads,

from the end-use level up to the aggregation point Entities encouraged to install more recording devices at the distribution level

Key Takeaways

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• Transmission Planning Experience Phased adoption of the CLM has allowed utilities to gain experience and

build confidence in model (no stalling vs. stalling). Utilities in WECC using Phase 1 CLM for TPL compliance and seasonal

operating studies to set SOLs since 2014. Disabling stalling effect in CLM still provides detailed model of induction

motor, power electronic, and static load; and provides capability to model protection settings and distribution equivalent.

Systematic sensitivity studies are necessary to identify key parameters deserving attention.

Need software vendors more engaged with utility needs. Need for software implementation benchmarking and robust initialization

process. Need a forum for industry practitioners to share experience and further

advance the state of dynamic load modeling.

Key Takeaways

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• Transmission Planning Experience (Cont.)

Key Takeaways

0.00

0.05

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0.15

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0.25

0.30

0 4 8 12 16 20 24

Load Model Fractions

Motor A

Motor B

Motor C

Motor D

Power Electronic

Static P Resistive

Static P Current

0 5 10 15 20 25 300.7

0.75

0.8

0.85

0.9

0.95

1

1.05

1.1

1.15

500-kV Bus Voltage

0 5 10 15 20 25 300.7

0.75

0.8

0.85

0.9

0.95

1

1.05

1.1

1.15

115-kV Bus Voltage

0 5 10 15 20 25 300.7

0.75

0.8

0.85

0.9

0.95

1

1.05

1.1

1.15

500-kV Bus Voltage

0 5 10 15 20 25 300.7

0.75

0.8

0.85

0.9

0.95

1

1.05

1.1

1.15

115-kV Bus Voltage

3φ, normal clearing 1φ, delayed clearing

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• Key Takeaway – Need a centralized forum for load modeling Support development and utilization of existing load models; Share industry modeling and analysis practices; Act as industry focal point for advancement of software tools; Ensure software platforms perform at same maturity and usability; Support next generation model development, provide industry-wide input.

• Led to formation of NERC Load Modeling Task Force (LMTF) Currently have about 35+ members on Roster At least 3 major software vendors involved Key modeling SMEs involved Collaborating with WECC LMTF and NPCC LMWG

• Seeking participation – large TPs/PCs, major ISO/RTOs If interested, contact Ryan Quint (ryan.quint@nerc.net)

NERC Load Modeling Task Force (LMTF)

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Preliminary LMTF Priorities

# Task Priority Due Date1 Fix Bad Data 1 Q1 20172 Common Initialization Procedures 2 Q1 20173 Benchmarking Software, Fixing Bugs 3 Q1 20174 Educational Materials and Workshops 4 Ongoing5 Robust (Default) Data Sets 5 Q1 20176 Improved Protection System Modeling 6 Q2 20177 Efficient Data Management & Model Structure 7 Q2 20178 Study Impacts & Practices 8 Ongoing

9 Technical Reference Document (from Workshop)* 0 Q2/3 2016

* Compilation of technical work presented at workshop into consolidated, concise reference document – 80% complete.

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