Getting PSCAD/EMTDC. Education Edition available in the Senior Design. Also a free student edition (15 node limit)

Transcription

1 Getting PSCAD/EMTDC Education Edition available in the Senior Design and PC lab, hopefully on VLAB too.» Version 4.2 and Also a free student edition (15 node limit)» Version 4.5.1» Only available for Windows Vista or later (not XP) Go to: Create account through MyCentre» Follow installation instructions including Fortran compiler 1 PSCAD 4.2 versus Examples will be created using version 4.2» Will run under 4.5.1» Cases created using can t go back to version 4.2 May run into issues with 15 node limit in free edition Try to learn from the examples that install with the program 2 1

2 U Creating a file in I PSCAD/EMTDC vers 4.2 Create new project Set project as active (blue icon) Double click on project to open schematic drawing pallet» Can view an inactive project by not run it 3 Adding components (1) A few basic components in bars on right of screen 4 2

3 Adding components (2) Can also add components by right clicking mouse in drawing area» Add Component 5 U Adding Components (3) I Master Library Libraries for different types of components» Select one to expand it» Copy the component you want to use» Need to double click on your project» Paste the component 6 3

4 Moving Up Modules When you are in a submodule you can move up with: 7 Setting up your simulation Right click in drawing area» Select Project Settings 8 4

5 Project Settings Usually interested in Runtime» Duration» Solution time step» Channel plot step May want to save channel to disk 9 U Adding a Single Phase I Source Copy source from library» Double-click for dialog box Several pulldown menus»first configuration 10[ohm]

6 Source Configuration Enter source name Source impedance» For example ideal Circuit symbol changes when done Can also specify» Grounding» AC/DC» Input internal or external External allows user interactive or control loop R=0 11 Other data entry points Signal parameters» RMS magnitude» Ramp-up time Remember no steadystate solution» Initial phase (sine wave)» Frequency Impedance fields won t allow entry for ideal 12 6

7 U Resistors, Capacitors, I Inductors For single phase branches can get from menus in window or master library» Need to get from master library for polyphase» Have option of 3 phase view of single line diagram view in later versions of program Enter R in ohms, L in H and C in F 13 Switches and s Copy from Master Library For example, for a fault» Need the fault switch itself» And the fault timing control» And need a signal node» Signal name matches input name for fault (default is ) Similar for a breaker» Need three parts Timed Logic SignalName 14 7

8 s Configuration:» name (control input) Must match signal_name» Clearing and chopping are for switches Main data» On and Off resistance (same for switches open close) 15 s Internal Output» Can request current output (can reduce node count) Signal name:» Set to match fault control input SignalName 16 8

9 Timed Logic Set start time and duration of fault Attach signal name to end of line on icon:» Set to match fault control input Timed Logic 17 Configuration» Breaker name is again control input Can specify interrupting current» Current chopping limit Preinsertion resistance» Current limiting R Symbol type Breakers BRK 18 9

10 Main Data» Open/Closed resistance Preinsertion Breakers BRK 19 Breakers Output data» Current measure Name appears on circuit symbol IS1 BRK 20 10

11 Breaker Timing Logic Controls timing of switching» Again need signal input to match breaker control Timing control» Number operations» Initial state» Timing of operations 21 BRK Timed Breaker Logic Transformer Models Several Options» One will be shown Main dialog box» Per unit leakage reactance» No load losses from open circuit test» Copper losses from rated current through winding resistances 22 11

12 Winding voltages Note that three phase transformer uses RMS L-L voltages for ratio and to convert per unit values to ohms and mh Additional menu options 23 Connecting circuit together Wire icon on top toolbar» Pencil symbol appears» Trace with left mouse clicks Click each time change direction» Right click or escape to complete Right click lets you select points to rescale Junction to connect wires as cross each other (otherwise disconnected» Get from right click in drawing space 24 12

13 U Voltage and Current I measurements Voltage measurements» Can do line to ground and arbitrary Need to connect to circuit Name the measurement (default is Ea) Current measurement» Need to connect to the line, don t t copy on top of a wire. Ia Ea 25 Output Channels Create output channel next» Again need signal» Connect to Output channel Choose Input/Output Reference I I 26 13

14 nput/output Reference I Graphs Several Options» Add Overlay Graph Most Common» If choose Add as Curve» Paste to existing graph 2.00 Main : Graphs Right click in white part y (kv) nput/output Reference: I Meters Add as Meter Then select put a control panel in your drawing (from right side tool bars or right click of mouse)» Right click - Paste : Co

15 Complete Circuit 30 Main : Graphs [ohm] [H] 10 R=0 Timed Logic y (kv) Main : Graphs I I Main I e-010 y (ka) U Complete Circuit: I without graphs shown [ohm] [H] R= =0 Timed Logic Main... I I e

16 Power Electronic Circuits Start with the master library Can build a converter from switches Or use a completed modules 31 Power Electronic Devices Symbols for several devices Transistor, IGBT and GTO all very similar 32 16

17 Switch dialogs 33 Switching controls Interpolated switching» Adjusts if switching instance falls between time steps» Allows larger time steps» Also interpolated controls to improve accuracy 34 17

18 Switching controls Interpolated switching» Adjusts if switching instance falls between time steps» Allows larger time steps» Also interpolated controls to improve accuracy H L H OFF L H ON L Interpolated firing pulse generator 35 Switching controls» One for thyristor and one for controlled turn off devices H L H OFF L H ON L Interpolated firing pulse generator 36 18

19 Simple firing control D Duty Ratio F 1.0 D + - F Tria_off H OFF L Tria_on H ON L 37 19