OPAL-RT - PSIM & eHS Interface
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The document describes OPAL-RT's real-time power systems simulator using the electric Hardware Solver (eHS). The eHS allows simulation of switched electronic circuits in real-time on an FPGA. It can interface PSIM models with up to 24 switches, 60 passive components, and 16 sources/measurements. Models are built in PSIM and simulated offline and online. Case studies on a boost converter and three-phase inverter are presented. Prospectively, all I/O specification and acquisition will be done outside Simulink/MATLAB.
OPAL-RT - PSIM & eHS Interface
- 1. www.opal-rt.com Asma Merdassi, Ph.D. 05/12/2014 OPAL-RT TECHNOLOGIES REAL-TIME POWER SYSTEMS SIMULATOR PSIM-eHS Interface
- 2. 22 Outline • Introduction : electric Hardware Solver (eHS) • Building a PSIM model with eHS solver • How to Start • Case studies • DEMO • Prospective : New Workflow
- 3. 33 Introduction : electric Hardware Solver (1/3) eHS : electric Hardware Solver • Simulation of switched electronic circuit on FPGA • Very high sampling frequency, up to 5 MHz • Building electric circuit models from a PSIM circuit in real-time (with Ts between 150 nanos to 1µs) • No need to write mathematical equations • Use of PSIM schematic editor • Can be interfaced with real devices, such electronic system controllers, through analog and digital input, output hardware
- 4. 44 Introduction : electric Hardware Solver (2/3) eHS : electric Hardware Solver • Circuit parameters and topology can be changed without regenerating the bitstream • Up to four (4) eHS cores can be interconnected • Data logging implemented on FPGA to record signals with time steps as low as 200 nanoseconds
- 5. 55 eHS (electrical Hardware Simulation) Solver Automatic generation of NetList file (circuit.cct) Parsing NetList Nodal Analysis Approach Generating eHS matrixes Automatic methodology OUTPUTS FPGA Implementation USER INPUT Introduction : electric Hardware Solver (3/3) Structure of converter PSIM circuit editor (Circuit.psimsch)
- 6. 66 Building a PSIM model with eHS solver Switches Sources Passive components Measurements PSIM Electrical Source Library
- 7. 77 Parameter settings for switches Building a PSIM model with eHS solver For one circuit, the eHS solver supports a maximum number of 24 switches.
- 8. 88 Building a PSIM model with eHS solver Parameter settings for passive components For one circuit, the eHS solver supports a maximum number of 60 non-switching devices (ie. L and C) and unlimited number of resistors.
- 9. 99 Building a PSIM model with eHS solver Parameter settings for sources For one circuit, the eHS solver supports a maximum number of 16 inputs (voltage/current sources).
- 10. 1010 Building a PSIM model with eHS solver Parameter settings for sources
- 11. 1111 Building a PSIM model with eHS solver Parameter settings for measurement components For one circuit, the eHS solver supports a maximum number of 16 outputs (voltage/current measurements).
- 12. 1212 Building a PSIM model with eHS solver • Each circuit requires at least one ground. • It is used as a reference by the solver and can be placed anywhere in the circuit. Ground
- 13. 1313 Building a PSIM model with eHS solver • There are two types of inputs and one type of output to eHS: Inputs 1. Electrical source (voltage or current) referred to as “U” 2. Pulse controlling a power switch referred to as “SW” Outputs 1. Electrical measurement (voltage or current) referred to as “Y” • The order of the inputs and outputs in the vector is determined by their name. Note: 1. The names for all blocks used for input and output must start with the type+index (U01/SW02/Y01) and the “0” cannot be ignored 2. The order of the inputs and outputs must match the index 3. The index must be consecutive (ie. 01,02,03; not 01,03) Rules of design – Inputs and Outputs
- 14. 1414 Building a PSIM model with eHS solver Example of a valid PSIM model for eHS
- 15. 1515 Building a PSIM model with eHS solver Example of a valid PSIM model for eHS switches SW01 SW02 SW03 SW04 SW05 SW06
- 16. 1616 Building a PSIM model with eHS solver Example of a valid PSIM model for eHS sources U01 U02 U03
- 17. 1717 Building a PSIM model with eHS solver Example of a valid PSIM model for eHS measurements Y01 Y02 Y06 Y03 Y05 Y04 Y08 Y07 Note: the snubber resistors across the switches are not required for eHS simulation; this may be useful to prevent discharge of output capacitor for no-load cases
- 18. 1818 Building a PSIM model with eHS solver Inserting the PSIM circuit into an RT-LAB Model • Implements the driver that manages all communication with the eHS firmware. • Initializes the solver and transmission in real time of the circuit control signals (current and voltage source control signals, switching information of the switches). Note: You can find more details for eHS dual block in the Matlab- eFPGAsim Blockset Help (eHS User Guide)
- 19. 1919 • This block enables the developer to simulate each part of the circuit with exactly the same eHS solver used for FPGA simulation with the same sample time. • Users can then compare results expected with eHS with PSIM results using off-line simulation, without using FPGA hardware • The effect of parasitic inductors and capacitors added by eHS can then be easily assessed • This block enables the developer to connect the block exactly as it is connected inside the FPGA-based board firmware • One offline block should be added for each eHS solver core Building a PSIM model with eHS solver Offline Simulation
- 20. 2020 How to Start The following toolboxes are needed: • RT-LAB • RT-EVENTS (to simulate accurate controller on CPU) • eFPGAsim (to interconnect the CPU and FPGA and load the bitstream) Supported FPGA boards: • OP5600 : ML605 VIRTEX 6 • OP4500: KINTEX 7 • OP5607: VIRTEX 7 • NI cRIO – ZYNQ7020 Software versions: • RT-LAB v10.6.4.280 • PSIM v9.3 (64 bits) Requirements
- 21. 2121 Create a PSIM Model with eHS supported blocks Create a CPU Model Simulink Save the CPU Model on the same folder with the PSIM model Create a RT-LAB Project Build the model and Load/Execute (XHP mode) Compare online simulations with PSIM simulations • Make a Simulink model for Controller and I/O • Choose a fixed-step solver, sample time (Ts) • Configure parameters of Dual eHS block • Add Simulink CPU model to RT-LAB • Assign and configure a target to the model • Rename elements using the eHS naming convention • Select the order of outputs Step 1 Step 2 Step 3 How to Start
- 27. 2727 DEMO • Boost Converter • PSIM simulation • eHS offline • Real-time simulation • Inverter 3 ph • PSIM simulation • eHS offline • Real-time simulation • Inverter 3 Level (NPC) • Real-time simulation
- 29. 2929 Prospective All I/O specifications and acquisition control will be specified, configured and controlled outside of Matlab/Simulink.
- 30. 3030 Prospective – 4Q2014 Create a PSIM Model with eHS supported blocks Create a CPU Model Simulink Save the CPU Model on the same folder with the PSIM model Create a RT-LAB Project Build the model and Load/Execute (XHP mode) Compare online simulations with PSIM simulations • Choose fixed-step solver, sample time (Ts) • Configure parameters of Dual eHS block • Control + I/O • Add CPU Simulink model • Assign and configure a target to the model • Rename elements using the eHS naming convention • Select the order of outputs Modeling Steps Step 1 Step 2 Step 3
- 31. 3131 Prospective – 4Q2014 Create a PSIM Model with eHS supported blocks Create a RT-LAB Project Build the model and Load/Execute (XHP mode) Compare online simulations with PSIM simulations • Assign and configure a target to the model • I/O • Rename elements by using the eHS naming convention • Select the order of outputs Modeling Steps Step 1 Step 2
- 32. 32 New Workflow 32 Select Torque Select AI_01 Drag & Drop
- 33. 3333 Thank You!