Lessons Learned in Model Validation for NERC …w3.usa.siemens.com/smartgrid/us/en/transmission-grid/products/grid...Lessons Learned in Model Validation for ... base case with current

Lessons Learned in Model Validation for NERC Compliance

usa.siemens.com/digitalgrid Unrestricted © Siemens Industry, Inc. 2017

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Unrestricted © Siemens Industry, Inc. 2017

July 2017 Digital Grid | PTI

NERC Modeling, Data, and Analysis

MOD‐025‐2: Generator Real and Reactive Power Capability Demonstration

MOD‐026‐1: Verification of Models for Generator Excitation Control Systems

MOD‐027‐1: Verification of Models for Turbine/Governor and Load Control Functions, including validation of turbine droop and determination of governor’s deadband

MOD-033-1: Steady-State and Dynamic Power System Model Validation

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Unit Size for NERC Model Validation Requirement (MVA)

ERCOT Eastern Interconnection WECC

Individual Unit Plant Individual

Unit Plant Individual Unit Plant

MOD-25-2 >20 >75 >20 >75 >20 >75

MOD-26-1 >50 >75 >100 >100 >75 >75

MOD-27-1 >50 >75 >100 >100 >75 >75

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Siemens PTI Services

• Onsite technical assistance for performing the tests • Field tests data processing • Model validation (PSS®E/PSLF) • Verification of generator OC excitation curve and generating unit inertia

constant • Adjustment of controllers parameters • AVR and PSS tuning • Over- and Under-excitation limiter adjustment • V/Hz limiter adjustment • Development of user-written models

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MOD-025-2 Generator Tests

Estimated and Operating capability curve (D-curve)

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MOD-025-2 Generator Tests

Measurements: • Active & reactive power, voltage at unit terminals (point A) • Active & reactive power, voltage at the high voltage side of the GSU (point F) • Active & reactive power through the high voltage side of the auxiliary transformer (point B) • Voltage at the low voltage side of the tertiary winding (point C) • Active and reactive power at the high voltage side of the

GSU of the other units (point D)

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MOD-026-1 Generator Excitation Control System Model Verification

• Open-circuit dynamic response calibration

• Interconnected dynamic performance calibration

• Validate model parameters by comparing field test records against current PSS®E or PSLF dynamic models

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MOD-026-1 Generator Excitation Control System Model Verification

• Open-circuit dynamic response calibration

• Interconnected dynamic performance calibration

• Validate model parameters by comparing field test records against current PSS®E or PSLF dynamic models

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MOD-027-1 Turbine/Governor and Load Control Functions Model Verification

• Validation of the speed governor response for an on-line perturbation test with synthetic speed signal of ±0.2Hz

Governor Modeling Improvements for Stability and Frequency Response Studies

MISO Experience


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Result of NERC MOD-033 System Model Validation performed by MISO

• MISO uses the Eastern Interconnect Wide Model for Transient Stability Analysis. These models predicts system frequency response settling at a higher value.

• This difference between the simulated and the PMU recording is due to lack of deadband in the governor model. This modeling issue has been a known for a long time.

59.8600

59.8800

59.9000

59.9200

59.9400

59.9600

59.9800

60.0000

60.0200

0.00

0.28

0.55

0.83

1.09

1.37

1.64

1.92

2.19

2.47

2.74

3.02

3.29

3.57

3.84

4.12

4.39

4.67

4.94

5.22

5.49

5.77

6.04

6.32

6.59

6.87

7.14

7.42

7.69

7.97

8.24

8.52

8.79

9.07

9.34

9.62

9.89

10.17

10.44

10.72

10.99

11.27

11.54

11.82

12.09

12.37

12.65

12.92

13.20

13.47

13.75

14.02

14.30

14.57

14.85

15.12

1540

Frequ

ency

in H

zTIme in sec

Frequency with Current Models

PMU

Frequency nadir differs

Settling frequency is optimistic.

Gen trip simulated at 0.5 sec

Synchrophasor data

Frequency comparison on 345 kV Bus near the generator

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Governor Dadband Modeling Improvement

• 14 governor models with deadband blocks were released in PSS®E versions 33.10 and 34.2

• MISO did extensive testing of these new models on the Eastern Interconnection with very encouraging results

IEEEG1*

IEEEG1SDU*

asymmetrical dead-band

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MISO Test Results of 2020 Summer Dynamic case with New Governor Models, compared to Real Time Data

59.920

59.930

59.940

59.950

59.960

59.970

59.980

59.990

60.000

60.010

0.0

0.4

0.7

1.1

1.4

1.8

2.2

2.5

2.9

3.2

3.6

4.0

4.3

4.7

5.0

5.4

5.8

6.1

6.5

6.9

7.2

7.6

7.9

8.3

8.7

9.0

9.4

9.8

10.1

10

.5

10.8

11

.2

11.6

11

.9

12.3

12

.7

13.0

13

.4

13.7

14

.1

14.5

14

.8

15.2

15

.6

15.9

16

.3

16.6

17

.0

17.4

17

.7

18.1

18

.5

18.8

19

.2

19.6

19

.9

Hz

seconds

PMU : Frequency at 345 kV Bus near Fermi Plant

Frequency, New Governor Type, 2020SUM

Frequency, Base Model, 2020SUM

Generating Unit

*MISO Dynamics model

Wind at 15.6% of Pmax in MISO

Settling frequency in simulation (red trace) closer to Real time data (purple trace), which is critical for any frequency related studies. Note :Some difference expected as case represents an out year scenario, not the actual system condition pre-event.

Green trace represents base case with current governor models.

Incorrect model prediction.

Power Plant Model Validation using PSS®E Playback Model


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PSS®E Playback Model PLBVFU1 Overview

• The PLBVFU1 model plays back a known set of voltage and frequency signals

• The PLBVFU1 model acts as a generator model

(with no excitation system or turbine-governor models)

• The played-in voltage and frequency signals must be included in a data input file

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PSS®E Playback Model Playback Model for Voltage Signal

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PSS®E Playback Model Playback Model for Frequency Signal

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PSS®E Playback Model Playback Model Example Test System

Playback generator

Unit to be tested

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PSS®E Playback Model Playback Model – PMU data vs. PSS®E simulation results

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Contact Us

Carlos Grande-Moran Principal Consultant Siemens Power Technologies International E-mail: [email protected]

Dinemayer Silva Staff Consultant Siemens Power Technologies International E-mail: [email protected]

usa.siemens.com/digitalgrid

mailto:[email protected]

mailto:[email protected]

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Lessons Learned in Model Validation for NERC …w3.usa.siemens.com/smartgrid/us/en/transmission-grid/products/grid...Lessons Learned in Model Validation for ... base case with current