example studies using hybrid simulation · 2017-07-26 · steps to create a hybrid simulation 1....

Example Studies Using Hybrid Simulation

2017 IEEE PES General Meeting/ Analytics Methods for Power Systems Committee Panel Session

Panel Session Title: “Challenges and solutions of interfacing techniques for EMT/TSA hybrid simulation ‐ Industry perspectives”

July 20, 2017

Garth IrwinChaminda AmarasingheElectranix Corporation

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Electranix Corporation

Background and ToolsSimulation Tools Used:• PSCAD (EMT)• PSS/E (TS)• E‐TRAN (Translation Tool)• “E‐TRAN Plus for PSS/E” (Hybrid Co‐Simulation)• “E‐TRAN Plus for PSCAD” EMT Parallel Processing

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Hybrid Simulation• Simultaneous runs using both TSA and EMT

tools (EMT models embedded in transient stability simulations)

• Interface models on both sides, exchange information.

• EMT models (to represent offshore VSC multi‐terminal grid and wind turbine models etc…)

• TS models (to represent the full AC system, including all modes of oscillation from nearby machines)

• Same communication library (between cpus of computers on a LAN)

• Plotting and control by a central GUI/operator

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Transient Stability Model

EMT ModelEMT Model

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CPU #1 CPU #2

TCP/IP Communication

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Transient Stability Model

G

CPU #3CPU #1

Large System Large System

Pure Transient Stability Model

Hybrid EMT/TS Model

Steps to Create a Hybrid Simulation1. Start with a working TS case (loadflow and

dynamic models)2. Identify the “kept network” (ie what is to be

modeled in EMT – right side of the example)• Perform harmonic impedance scans for successively

larger cases (adding shunt caps and long lines etc.. until frequency response is accurate)

• Can include machine busses (TS machine data is also translated into EMT)

• Add busses of complex models which are to be represented with detailed EMT models

• A general list of busses (that do not have to be interconnected).

3. Translation tool will generate:• EMT case (adds neteq of TS portion)• Python script for TS (adds neteq of EMT portion)

4. Run Python script in TS to generate hybrid case5. Run EMT Case (and auto‐start TS case) or

modify TS case to auto‐start EMT case)


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TS Hybrid Portion

Original TS Case

Multi-port equivalent

EMT Hybrid Portion


Hybrid EMT-TS Simulation

Kept Network

Simultaneous runs using both TS and EMT.• Interface models on both sides, exchange of

terminal information.• Every component is only modeled once (in

either EMT or TS).• Instantaneous response (faults etc.) in systems

separated through interfaces is correct due to multi‐port off‐diagonal LDU derived equivalents (unlike simple source equivalent interfaces)!

Also Includes:• Transfer of signals from EMT to/from TS• Plotting and control by a central GUI/operator

(and auto‐start of other cases)• Support for Snapshots• Support for any number of boundary busses,

any combination of multiple TS, multiple EMT, parallel TS or parallel EMT simulations.



EMT model

TS model


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Combined TS-EMT Hybrid Simulation

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EMT Parallel Processing• Traveling wave transmission line models have

natural time delays.• Simulations can be broken up at Bergeron

transmission line boundaries or at Scaling Transformers.

• Results on 1 CPU or multiple CPUs are identical.• Multiple cores on one computer, or multiple

computers across a LAN can be used.• Auto‐launch of one process from another used to

make parallel processing easy to use • Any number of processors, different time steps,

program versions or compilers.

TCP/IP Communication

CPU #1

Single CPUEMT Model

Complex System

Complex System

Complex System

Complex System

EMT Model

ParallelizedEMT Model

Complex System

Complex System

Complex System

Complex System

EMT Model

CPU #1

EMT Model

CPU #2

EMT Model

CPU #4

EMT Model

CPU #3

Atlantic Wind Studies7


CPU 11

CPU 12

CPU 10

CPU 9

CPU 8

CPU 4

CPU 5

CPU 6

CPU 7

CPU 1

CPU 3

CPU 2

TS case with 3 interfacing points

HMI

CPU 13

CPU 14

Electrical signals

To all CPUsTo all CPUs

Communication signals

4 Terminal VSC/HVDC Link ‐ Hybrid and Parallel Computing Using 9 Processors

Hybrid Interface from EMT to Transient Stability Parallel Processing EMT Detailed Model

HMI/Control


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HVDC/VSC StudiesCompare 2nd LCC Pole to VSC Pole

MainlandTransient

Stability V32

Island Transient

Stability V29

EMT Detailed HVDC Models

(Monopole and Bipole LCC)

EMT Detailed VSC Models

(Monopole)

MISO HVDC Concept (by Dale Osborn)


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Large System Study Example11


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Multi‐Vendor Simulation Setup

Wind #1

LAN/Switch

Wind #2 VSC #1 VSC #2 VSC #3

Private VPN interfaces (allows manufacturers to remotely participate and update models)

Simulation Manager(Public Area)

Central Control Computer- Start cases (on all computers)- Stop, pause, take snapshots…- Plot quantities from all cases- Apply faults anywhere in EMT or TS- Only user who has share access to run manufacturer’s cases on its computer- TS case be on this or on another dedicated computer

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Thank You!Contact:

Garth [email protected]

Chaminda [email protected]

example studies using hybrid simulation · 2017-07-26 · steps to create a hybrid simulation 1....

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