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INTRODUCTION TO PSCAD

INTRODUCTION TO PSCAD. ECE 692 Grid Measurement and Simulation Abdulelah Alharbi. Outlines:. Getting started and basic features of PSCAD , System Simulation of PSCAD, Demo, Converting a solved PSS/E Case to PSCAD. Contents:. Access to PSCAD, Software Introduction,

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INTRODUCTION TO PSCAD

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  1. INTRODUCTION TO PSCAD ECE 692 Grid Measurement and Simulation AbdulelahAlharbi

  2. Outlines: • Getting started and basic features of PSCAD, • System Simulation of PSCAD, • Demo, • Converting a solved PSS/E Case to PSCAD.

  3. Contents: • Access to PSCAD, • Software Introduction, • Environment overview, • Create a project, • Run simulation.

  4. Access to PSCAD: 1. Free version https://mycentre.hvdc.ca/ Network size: 15 nodes 2. Educational version Ask ithelp in EECS Department (25 licenses) Network size: 200 nodes 3. Professional version Ask ithelp in EECS Department (1 license) Network size: unlimited nodes Latest version: 4.5.4 (announced in 12/23/2014) 4. Remote access rd0.eecs.utk.edu or rd1.eecs.utk.edu

  5. Software Introduction: Power System Computer Aided Design • Algorithm: EMTDC( ElectroMagnetic Transient in DC System) developed by Dr. Dennis Woodford in Manitoba-HVDC Research Centre in last 70th. • A simulator of ac power systems, low voltage power electronics systems, high voltage DC transmission ( HVDC), flexible AC transmission systems ( FACTS), distribution systems, and complex controllers. • Applications • AC transients • Fault and protection • Transformer saturation • Wind power • Power quality • Design power electronic systems and controls including FACTS, active filters, series and shunt compensation devices.

  6. Environment overview:

  7. Load a case: • To load an existing Case Project: File Load  Examples

  8. Create a case: 1. Build a blank project • New  New Case; • Type name “tutorial1” and choose a path; • Click “OK”; • Click “Save” on the quick access toolbar.

  9. How to find components: • Right click in design window, add component

  10. How to find components: • Under tab “Components” • In master library

  11. Draw a circuit: • The circuit is drawn in Schematic window. • Change parameters of components • Double click; • Or right click and choose “edit parameters”

  12. Measurements: • Measured by the component itself.

  13. Measurements: 2. Measured by meters( Ammeter, Voltmeter, Multimeter)

  14. Output signals: • Data label The name of data label should be the same as the signals' name from meters. • Output channel The name of output channel could be assigned any name for display. • Connect data label to output channel

  15. Plot: • Add Graph Frame Right click  Add component  Graph Frame

  16. Plot: 2. Add Overlay Graph Right click on Graph Frame  Add Overlay Graph

  17. Plot: 3. Add output signals to graph Press ctrl and left click output channels, then drag it to graph.

  18. Simulation: Run Time settings could be set by Project  General Settings Runtime

  19. Outlines: • Getting started and basic features of PSCAD, • System Simulation of PSCAD, • Demo, • Converting a solved PSS/E Case to PSCAD.

  20. Contents: • Breakers, • Faults, • Distributed Transmission Line, • Generators, • Exciters, • Transformers, • Loads, • Group components with a module.

  21. Breakers and Faults: • Breakers Single phase, three phase breakers • Control Breakers (0: closed; 1:open) Timed breaker logic. Manual switch. Custom built relay model. Note: when control goes from 0 to 1, the breaker will open at the first current zero.

  22. Breakers and Faults • Faults 11 faults • Clear Faults( 0: closed; 1:faulted) Timed fault logic. Manual switch. Custom built control model.

  23. Create a distributed transmission line: • Right click in the design window • Component wizard  Transmission line and enter a name, then click Finish. • Double click the line in the design window • Select type of transmission line model Master Library  Bergeron Model • Add tower cross-section Master Library  Line/Cable Constants Manual Data Entry • Additional options It is optional, just for display function

  24. Generator: 1. Configuration  Type of setting for initial conditions a. None (Preferred option, which simply allows entry of terminal voltage magnitude and phase for initialization.) b. Powers c. Currents 2. Interface to Machine Controllers 2.1 Supply Terminal Conditions to Exciter: • None, • Terminal Voltage, • Terminal Current, • Both Voltage and Current 2.2 Smoothing Time Constant: used in smoothing the signal sent to the exciter [s] 2.3 Output Exciter Initialization Data (Ef0): required field voltage is used to initialize the exciter, so that the machine can be switched from source mode to machine mode smoothly. 2.4 Output Governor Initialization Data (Tm0): the required mechanical torque is used to initialize the turbine and/or governor, so that the machine can be switched from 'locked-rotor' to 'free running' mode smoothly. 3. Variable Initialization Data a. Source [0] to Machine [1] Transition 0:  While 0, the machine is modeled as a simple 3-phase voltage source. 1: When 1, the machine runs in 'constant speed' mode. b. Lock-rotor [0] <-> Normal Mode [1] Transition While 0, the machine will run in 'constant speed' mode.   When 1, the machine will run as a full-blown machine.

  25. Generator: 4. Basic Data Rated RMS Line-to-Neutral Voltage Rated RMS Line Current Base Angular Frequency Inertia Constant Number of Coherent Machines 5. Generator Data Format 6. Initial Conditions Terminal Voltage Magnitude at Time = 0- Terminal Voltage Phase at Time = 0- 7. Initial Conditions if Starting as a Source 8. Initial Conditions if Starting as a Machine 9. Output Variable Names 10. Output Variables for Controller Initialization Source (0) machine (1) Transition Give a variable name.  This will change its assigned value from 0 to 1 when the machine is switched from a 'source' to a 'machine'.  Use this variable in the exciter model to initialize it Constant speed (0) normal (1) Transition Give a variable name. This will change its assigned value from 0 to 1 when the machine is switched from a 'constant speed operation' to a 'normal machine'.  Use this variable in any governor/turbine models to initialize them

  26. Example: • Refer to example “sync_Sctest_exercise” .

  27. Exciter (AC exciter as example): • Ef: Computed field voltage applied directly to synchronous machine • If Measured field current from synchronous machine • Vref defines the voltage reference for the synchronous machine terminals. It can be derived from a number of different components, which might include a slider, a real constant component or some other signal. • VT_IT a 3-element array and receives its data from the attached synchronous machine • Ef0 defines the output field voltage to the machine during the initialization period. Defined by user or from the attached synchronous machine. • Vref0 The initialized value of the reference voltage Vref and can be applied at the users discretion

  28. Exciter Setting: • AC Exciter Type • Exciter Status (Come from attached machine) 0: Initialize 1: Normal • Output Internally Computed Initial

  29. Example: • Refer to example“sync_exciter_exercise” • 0-0.3s, work as source mode • 0.3-0.5s, work as machine with lock rotor mode • After 0.5s, work as a machine with normal mode

  30. Transformers: • Configuration Name: T1 3 Phase Transformer MVA: 100MVA Base operation frequency: 60 Winding #1 Type: Delta Winding #2 Type: Y Positive Sequence Leakage Reactance: 0.1 • Winding Voltages Winding 1 Line to Line voltage (RMS): 13.8 kV Winding 2 Line to Line voltage (RMS): 230 kV

  31. Load: • Constant power load

  32. Load: • Constant Impedance load: • RLC Branch Components • Variable RLC Components • 3 phase loads

  33. Group components with a module: Before create a module, the number of ports and the type of ports should be determined. Port is the connection between the component and the outside system port type: electrical, input, output Node/data type of electrical ports: fixed, removable, switched, ground Node/data type of input & output ports: integer, real, logical • Right click in the design window • Create  Component • Enter the name, title, check module • Add number of ports • Enter the name, dimensions, type of each ports • Click Finish A blank module will appear in the design window

  34. Group components with a module: • Double click the blank module • Build the circuit inside the module • Connect the module to the outside system • Simulation

  35. Outlines: • Getting started and basic features of PSCAD, • System Simulation of PSCAD, • Demo, • Converting a solved PSS/E Case to PSCAD.

  36. Contents: • Power flow setup, • Demo.

  37. General Method of Power Flow Setup: PSCAD can not solve power flow, so the power flow needs to be set manually. • 1. Determine the terminal voltage magnitude and phase Setting: • 2. Run all the generators as fixed AC source until the system is stable. Setting: To ensure that the steady state condition of the network is reached smoothly , time to ramp source to rated is set to a time interval entered by the user (0.1s for example) • 3. Switch the fixed AC source to Generators with lock rotor mode. Setting: “Source [0] to Machine [1] transition” under “Variable Initialization Data” • Enable exciters • Enable governors

  38. Demo:

  39. Outlines: • Getting started and basic features of PSCAD, • System Simulation of PSCAD, • Demo, • Converting a solved PSS/E Case to PSCAD.

  40. E-TRAN • E-TRAN, which is developed by ELECTRANIX Corporation, is a tool that allows for an automated conversion of a very large system into PSCAD (EMTDC) models from load flow programs . • It directly translates PSS/E data files (.raw, .dyr, and .seq) into PSCAD files (.psc and .pscx). • E-TRAN internally solves the steady state phasor equations and uses this information to initialize the system in PSCAD and make the system suitable for stability simulation analysis.

  41. E-TRAN • E-TRAN allows for the system to be partially or fully converted (all its nodes) into PSCAD. • Make sure the parameters of the generator models in PSS/E are reasonable, otherwise it will cause the numerical problems in the generator transition process from voltages sources to machines in PSCAD. • E-TRAN typically converts the load model in PSS/E to constant PQ models in PSCAD, which will probably lead to instability after releasing the load in PSCAD. If allowed, load can be changed to the constant impedance model to make the system stable after releasing load. • The .raw file needs to be solved before being converted to the PSCAD file. • Typically, both the .raw and .dyr files are needed in translation. If there is only a .raw file, the translation can be done. However, the PSCAD file translated based on the .raw file only can not simulate dynamic processes.

  42. E-TRAN • To request a trial version of E-TRAN, contact ELECTRANIX at: E-TRAN@electranix.com • The E-TRAN runtime library for PSCAD can be downloaded from: http://www.electranix.com/runtime/E-TRAN_Runtime_Lib_3_2.zip

  43. E-TRAN • To get the E-TRAN software : • First go to theElectranixwebsite at http://www.electranix.com/and scroll down to the E-Tran Client Login at the bottom of the page. Enter the user name and password that are given after contacting ELECTRANIX. • Download the E-TRAN License Manager and installit on a server, or someothercomputerthatwillalwaysbe on. Ifyouwillbeusing E-TRAN as a single user, thiscanbethecomputeryouwillinstall E-TRAN on. • When you install the License Manager, you will get the option to request a license. • Enteryourinformationintotheform. Thiswillsendtherequiredinformation to create a license. • Youwill get an e-mail aboutyourlicenseoncetheyhaveprocessedyourrequest. • Download E-TRAN and installit on anycomputersyouwant to run E-TRAN on.

  44. E-TRAN • Steps to run the PSCAD model: • Make sure that the file "ETRAN_G95.lib" exists in the directory "C:\Program Files (x86)\E-TRAN_V3\EMTDCLib\gnu\ETRAN_G95.lib". • If not, create the folder and copy the "E-TRAN_Runtime_Lib_3_2\EMTDCLib\gnu\ETRAN_G95.lib" into it. • Open the file "E-TRAN_Runtime_Lib_3_2\PSCADLib\PSCAD.pcsx" in PSCAD. • Make sure the “.raw” file and “.dyr” file is in the same folder as the “.pcsx” file you opened in PSCAD. • Open the file ".pcsx" in PSCAD.

  45. Some references: • PSCAD Forum http://bb.pscad.com/forumdisplay.php?112-Applications-of-PSCAD • User’s Guide of PSCAD https://hvdc.ca/uploads/ck/files/reference_material/PSCAD_User_Guide_v4_3_1.pdf • A comprehensive resource of EMTDC https://hvdc.ca/uploads/ck/files/reference_material/EMTDC_User_Guide_v4_3_1.pdf • Application of PSCAD http://www.scribd.com/doc/61646593/PSCAD-Application-Guide-2008

  46. Practice Exercise (1): • Based on example “simpleac” [in the tutorial folder in the examples] 1. Use synchronous machine instead of ac source Refer to example“sync_exciter_exercise” 2. Build your own 230V transmission line with Bergeron model. 3. Apply 10% load shedding in the following scenarios: • Synchronous machine without exciter (lock rotor mode) • Synchronous machine with exciter (free rotor mode) 4. 5. Repeat 3 and 4 by applying a fault.

  47. Practice Exercise (2): • 1. Build a three phase ac system (you can delete the BRK) • 2. Replace AC sources with Synchronous Machines (Use the Generator in example “sync_SCtest”). • 3. Measure and plot the voltage and current through the load. • 4. Please refer to “OOS_Protection”, Apply any 2 different kinds of fault close to the loads on the above system. Solve 3nd problem again.

  48. Practice Exercise (3): • Build a two machine one line system. • Rated power of one machine group: 12GW (120MW*100) • Transmission line: 500kV Begeron model • Constant power load 10% load shedding at bus 1 to trigger an electromechanical propagation. Monitor the frequency and angle at bus 1 and bus 2. Study the effect of the following parameters on propagation time between bus 1 and 2. Transmission length: 300km, 600km; Tie-line power: 300MW, 600MW; Inertia of machine 1, 3. Notes: when study on variable, fix the other two variables.

  49. Thank You

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