Dynamic Model for the Intermountain Power Project (IPP … Line Model of... · 2 • Documentation – Existing text file contained the actual user-defined model implementation of

[email protected] http://www.powerworld.com

2001 South First Street Champaign, Illinois 61820 +1 (217) 384.6330

2001 South First Street Champaign, Illinois 61820 +1 (217) 384.6330

Dynamic Model for the

Intermountain Power Project (IPP DC Line)

PowerWorld Client Conference May 20, 2014 Jamie Weber

[email protected] 217 384 6330 ext 13

mailto:[email protected]

2 © 2014 PowerWorld Corporation

• Documentation – Existing text file contained the actual user-defined

model implementation of the IPP model (IPP_weccm_3_4wcv2.p)

• PowerWorld took the actual 2,300 lines of code in the IPP_weccm_3_4wcv2.p file and determined the block diagram being modeled for this important device

Intermountain Power Project DC Line Model


Obfuscated File: Remove text between /* and */


Figure out the variables if (@st1g=1) @Pgen1=gens[@kgen1].pgen else @Pgen1=0 endif if (@st2g=1) @Pgen2=gens[@kgen2].pgen else @Pgen2=0 endif @NumMonaLinesInservice=0 if (secdd[@mona1].st=1) @NumMonaLinesInservice=@NumMonaLinesInservice+1 endif if (secdd[@mona2].st=1) @NumMonaLinesInservice=@NumMonaLinesInservice+1 endif @NumMWCLinesInservice=0 if ((@kamwcf<>0) and (@kamwct<>0) and (secdd[@mwc345].st=1)) @NumMWCLinesInservice=1 endif

if (@XXYY20338ZZWW=1) @XXYY25349ZZWW=gens[@XXYY94421ZZWW].pgen else @XXYY25349ZZWW=0 endif if (@XXYY38879ZZWW=1) @XXYY36984ZZWW=gens[@XXYY81136ZZWW].pgen else @XXYY36984ZZWW=0 endif @XXYY77248ZZWW=0 if (secdd[@XXYY90842ZZWW].st=1) @XXYY77248ZZWW=@XXYY77248ZZWW+1 endif if (secdd[@XXYY29510ZZWW].st=1) @XXYY77248ZZWW=@XXYY77248ZZWW+1 endif @XXYY19674ZZWW=0 if ((@XXYY39848ZZWW<>0) and (@XXYY93250ZZWW<>0) and (secdd[@XXYY16998ZZWW].st=1)) @XXYY19674ZZWW=1 endif


• In Simulator 18, along with looking for the PDCI model, Simulator will also look for the IPP DC Line and automatically include its appropriate dynamic response – Simulator will look for the IPP DC line in the case and

automatically include the dynamic model if appropriate – All parameters of the model are hard-coded then

• Version 18 will allow the user to explicitly add the dynamic models and also see the internal states of these models if desired – All parameters of the model will remain hard-coded for

model – May change this eventually change the hard-coding of

parameters if desired by users

PowerWorld Implementation and User Experience


• Assign dynamic model MTDC_PDCI to the multi-terminal DC Line record

• Assign appropriate dynamic converter models to the various DC converters: CONV_CELILO_E, CONV_CELILO_N, CONV_SYLMAR

Implementation Overview in Simulator of PDCI


• Assign dynamic model MTDC_IPP to the multi-terminal DC Line record

• Assign appropriate dynamic converter models to the various DC converters: CONV_IntMtnPP and CONV_Adelanto

• Same structure as PDCI

Implementation Overview in Simulator IPP DC


• The model is assigned to one Multi-Terminal DC record. – For the IPP, two separate MTDC records are modeled, one

for each pole of the IPP • Inputs

– From DC Converters: States of the sensed DC Current, DC Voltage, and AC Voltage at each converter

– AC Network: Direct access to network boundary equation AC voltages is also used

– Other MTDC_IPP: There is some feedback between the two poles in the DC voltage measurement at Intermountain

• Outputs – Feeds a reference current to each DC Converter model:

id_ref

MTDC_IPP


• Models assigned to the converter at the Adelanto and Intermountain – Models have identical structure, but different parameters.

Parameters presently hard-coded. • Inputs

– Reference current id_ref from MTDC_PDCI – Network boundary equation converter values: Idc, Vdc, Vac

• Output – Cosine of the control angle (Alpha or Beta as appropriate)

• Not surprisingly, the converter model is extremely similar to the SYLMAR converter in the PDCI model

CONV_IntMtnPP and CONV_Adelanto


CONV_SYLMAR




CONV_SYLMAR

Integration of Current Error

Delay with Rate Limit

Determine Max Control Angle

Gain From Feedback



Integration of Current Error

Delay with Rate Limit

Determine Max Control Angle

Gain From Feedback


Special MinAngle for large voltage drop at Intermountains


Special Algebraic Lookup for Angle Feedback


Parameters: Mostly the same at Intermountain and Adelanto


• Converter models are very similar to SYLMAR • MTDC_IPP however is what’s more complex

– The control of id_ref attempts to maintain constant power generally, however it varies for situations

• Changes in Wind Plant power coming into Intermountain 345 kV bus

• Changes in 2 Intermountain generator outputs • Status changes • Frequency deviations at the Intermountain 345 kV AC bus • Status changes on the two parallel 345 kV transmission lines

from Intermountain to Mona

Complexity of this model


Network around Intermountain in existing WECC Models

code was hard-coded to look for the following AC bus names: INTERMT MWC345 INTERM1G INTERM2G MONA INTERMT

code was hard-coded to look for the following DC bus names: INTMTN1R INTMTN1X INTMTN2R INTMTN2X


Slow lookup Control

Ping these algebraic values and recalculate every 0.035 seconds Slow time-scale Integration


• Drops in Wind Power output will result in a drop in the IPP DC Line power schedule

• Change in status of the INTERM1G or INTERM2G generators will also change the DC Line power schedule

• Time Constants are all in the 10 seconds • Everything is simple boolean logic with timers which

triggers various simple step responses that last 40 seconds

• Basic Idea – DC Line is being used to track changes in the wind output

and IPP generator output so that the AC network doesn’t absorb the changes

AC Connection to Wind Plants and 2 IPP Generators


AC Connection to Wind Plants


AC Connection to Wind Plants


Monitoring Changes in Two Intermountain Generators Status


Monitoring Changes in Two Intermountain Generators Status


Calculating Desired Power Schedule


Conversion of Power Schedule to a Current Schedule


Current Schedule Change due to Frequency or Mona Line status


Enforce Current Limits and Send id_ref signals to Converters


• PowerWorld Simulator 18 now includes the IPP dynamic model directly

• This document can serve as a block diagram for what is implemented in the existing IPP_weccm_3_4wcv2.p file helping with future updates to the model

• This document makes it more transparent to users what the model actually does

Summary


• Any event that changes the Intermountain generators

• Any event that changes the wind turbine plant outputs substantially near Intermountain

• Any event that opens the Mona – Intermountain 345 kV lines

• Any big frequency deviations at the Intermountain bus

• These models really need to be open

When is the detail of this model important?

Documents

Dynamic Model for the Intermountain Power Project (IPP … Line Model of... · 2 • Documentation – Existing text file contained the actual user-defined model implementation of