rt15 berkeley | ni / opal-rt power electronics hil teaching laboratory - national instruments
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National Instruments
We equip engineers and scientists with tools that accelerate productivity,
innovation, and discovery.
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National Instruments
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companies served annually
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Platform-Based Approach
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Power Electronics HIL Teaching Laboratory
Power Electronics HIL Teaching Laboratory by OPAL-RT TECHNOLOGIES is an
educational courseware intended to teach power electronics to university
undergraduate students
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Power Electronics HIL Teaching Laboratory
• Works with both OPAL-RT and NI hardware platforms
• Teach complex power electronics concepts with the inherent safety
and low cost of a simulated plant
• Experiment with converters, rectifiers, and inverters along with their
control techniques
• Use expert-designed lab manuals and courseware from industry
leader OPAL-RT
• Learn common control and validation concepts using industry-
standard HIL and RCP tools
• Customize and edit courseware and lab material for ultimate
teaching flexibility
• Software and courseware add-ons coming soon
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Power Electronics HIL Teaching Laboratory Power Electronics HIL Teaching Laboratory Exercises
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This circuit simulates a DC-DC Boost
converter with various loads.
Teaching objectives:• To understand the operating principles of a boost converter
• To observe and understand the effect of the load type and value on the boost output voltage
• To find the S1 switching duty cycle marking the delimitation between continuous and discontinuous operation modes.
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Demonstration – Module 1 – DC-DC Converter
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Module 2 –AC / DC Converter
This circuit simulates a 3-phase Diode-Bridge Rectifier
Teaching objectives:
• To introduce the student with a simple AC-DC converter
• To become familiar with its operation and diode operating principles
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Module 3 – DC / AC Converter
This circuit simulates a 2-level DC-AC converter with various loads
Teaching objectives:• To understand the operating principles of a H-Bridge Inverter
• To observe and understand the effect of the load type and value on the inverter output voltage and current
• To understand the effect of the PWM modulation index on the output current/voltage waveform.
S1
S2
S3
S4
S5
S6
VDC
VDC
Iload, A
Iload, B
Iload, C
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Module 3 – DC / AC Converter
3-Phase Inverter with External Control (Open Loop)
Digital Input
module
H-Bridge Inverter Model Solver (eHS)
Digital Output Module
SPWM Generator
myRIO cRIO
Teaching objectives:• To introduce the student with PWM generation for an H-Bridge Inverter.
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Module 3 – DC / AC Converter
3-Phase Inverter with External Control (Closed Loop)
Digital Input
Module
H-Bridge Inverter Model Solver (eHS)
Digital Output Module
Analog Output Module
Reference Signal
Generator
PI Controller
Hysteresis PWM
Analog Input
Module
Signal Rescaling
3-Phased current (Ia, Ib, Ic)
-
myRIO cRIO
Teaching objectives:• To introduce the student with a hysteresis closed-loop control
• To observe the effect of the hysteresis band on the pulse modulation
• To find the suited controller parameters according to load characteristics
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Module 4 – Three-Level NPC Converter
This circuit simulates a 3-level NPC converter with RLE load. It is
simulated in rectifier mode and in inverter mode
Teaching objectives:• To introduce the student with a higher-complexity circuit simulation through
behavioral analysis of its transient signals
• To observe the effect of the back-electromotive force on the converter in
generator (rectifier) mode or inverter mode
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The Electrical Hardware Solver (eHS)
The Power Electronics HIL Teaching Laboratory uses the eHS tool.
The eHS tool is a powerful FPGA-based generic hardware
power-electronics solver.
eHS increases the simulation accuracy of complex and fast electric circuits, as
well as, drives, by achieving very small model time step updates.
eHS
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eHS: Computation Time
On the cRIO, the eHS feature uses a 160-MHz clock.
• This enables very small computation step sizes, in general between 125 ~ 500 ns.
• Computation step sizes depends on the circuit complexity and the number of scenarios implemented.
• Loop rate of the Boost, Buck and Buck-Boost Converters models is 5.0 MHz (200 ns).
• Loop rate of the Diode-Bridge Rectifier model is 4.16 MHz (243 ns) for 1-phase, 3.3 MHz (300 ns) for 3-phase
converter.
• Loop rate of the 2-level inverter model is 3.7 MHz (268 ns).
• Loop rate of the NPC Converter model is 2.7 MHz (368 ns).
S1
VDC
Iload
Vload
S1
S2
S3
S4
S5
S6
VDC
VDC
Iload, A
Iload, B
Iload, C
U01
U02
SW0
1SW
02
SW0
3SW
04
SW0
5SW
06
SW0
7SW
08
SW0
9SW
10
SW1
1SW
12
SW1
3SW
14
SW1
5SW
16
SW1
7SW
18
RL1
RL2
RL3
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Creating New Exercises
The new exercises can be designed in the LabVIEW / LabVIEW FPGA environment to include
• A variety if input signal generators and simulation scenario management.
• Open-loop or closed-loop controllers including PWM generators, etc.
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Power Electronics Teaching Laboratory Software
Tools available through VI Package Manager (installed with LabVIEW)
Try the tools for free!
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Power Electronics Teaching Laboratory Software
Software available as an example LabVIEW project
Project includes link to courseware and documentation