Comparison of Two Power Electronic Topologies for Power Hardware in the Loop Machine Emulator

Fischer, Manuel; Erthle, Dennis; Ziegler, Philipp; Ruthardt, Johannes; Roth-Stielow, Jörg

doi:10.1109/apec39645.2020.9124094

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…All inverters are connected in parallel via coupling inductors, resulting in an interleaved multi-branch multi-level topology with 17 discrete output voltage levels. The parallel connection enables high output currents, as each branch conducts only about one eighth of the total output current [47]. Interleaved switching of the inverter branches using synchronized phaseshifted PWM carrier signals amounts to a high effective switching frequency of 8 • 16 = 128 kHz at the power modules' output terminals.…”

Section: ) Test Bench Setupmentioning

confidence: 99%

Opportunities and Challenges of Advanced Testing Approaches for Multi-Megawatt Wind Turbines

Hans,

Borowski,

Wendt

et al. 2024

IEEE Open J. Power Electron.

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To safely integrate large numbers of wind turbines into the electric power grid, turbines must demonstrate compliance with grid codes and technical guidelines through rigorous testing. Such tests are traditionally performed using prototype turbines on designated measurement sites. So-called field tests offer little flexibility and repeatability, as factors such as wind and grid conditions cannot be adjusted at will. Recently, specialized laboratory test facilities were established to augment or completely replace conventional field tests. These facilities need to constantly grow in size, power, and functionality to keep up with wind turbine trends, while new and increasingly complex grid requirements necessitate more advanced testing methodologies. This paper presents four testing concepts and how they can be further integrated into the development and certification process of wind turbines using the laboratories of Fraunhofer IWES as an example. In particular, turbine, nacelle, subsystem, and component testing are reviewed and their advantages and anticipated challenges for evaluating grid code compliance are highlighted. Experiences gained over the past decade from testing wind turbines and constructing experimental testing facilities are shared, including key data and capabilities of the developed test benches. The authors expect the presented approach to be used for validating simulation models that can be embedded into larger interaction and stability studies of wind farms at a later stage. Such an integrated testing approach may lead to quicker and more flexible design and optimization of new generations of wind turbines, effectively increasing the speed of grid integration and ensuring safe and reliable grid operation.INDEX TERMS Electrical certification, grid compliance, grid simulator, model validation, power hardwarein-the-loop, real-time simulation, test bench, wind turbine testing

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Section: ) Test Bench Setupmentioning

confidence: 99%

Opportunities and Challenges of Advanced Testing Approaches for Multi-Megawatt Wind Turbines

Hans,

Borowski,

Wendt

et al. 2024

IEEE Open J. Power Electron.

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“…Same as the voltages, the resulting currents also consist of a fundamental component and harmonics, as shown by (6) in the frequency domain.…”

Section: Real System Descriptionmentioning

confidence: 99%

“…1. Realtime emulators such as Power Hardware-In-the-Loop and Power Electronic Loads are employed in a wide number of applications including electric drives [2][3][4][5][6][7], renewables [8], railway [9], microgrids [10,11], ac grid emulation [12][13][14][15] and energy storage systems [16]. The selection of a specific solution will depend on converter topology, employed filter, and load characteristics.…”

Section: Introductionmentioning

confidence: 99%

A Methodology for High-Power Drives Emulation Using a Back-to-Back Configuration

et al. 2022

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Validation of high-power converters at the development stage often cannot be performed using the real load. A testbench consisting of the Equipment Under Test (i.e., tested power converter) and an auxiliary power converter, preferably using power recirculation, can be used instead. A challenge for correct testing using this approach comes from the fact that the harmonic content of the currents can significantly differ between the testbench and the real system. This might strongly affect the loading of power switching devices compromising the reliability of the validation process. This paper proposes a methodology to select the operating conditions of both tested and auxiliary converters in the testbench to resemble a given operating condition of the actual system. Since identical behavior is not generally possible, a cost function will be used to trade-off among different factors (i.e., fundamental current magnitude and phase, harmonic content, etc.). The proposed approach evaluates a large number (hundreds of thousands) of testbench operating points in a few seconds and selects those which minimize the cost function. In a later stage, the selected points can be validated using detailed dynamic simulation. The selected conditions can then be used to test the converter in the testbench emulating the real system behavior in a given operating point condition. The proposed methodology was developed for railway electric drives but can be extended to other applications.INDEX TERMS Railway traction drive, machine emulation, back-to-back inverters, current harmonics, power recirculation, high-power converter testbench. I. NOMENCLATURE v a , v b , v c : phase voltages in the time domain. ⃗ v EU T : EUT complex vector voltage in the time domain. ⃗ v EU T f : fundamental component of EUT complex vector voltage in the time domain. ⃗ v EU T h : h th harmonic component of EUT complex vector voltage in the time domain (ω h = h ω f ). ⃗ V EU T : EUT voltage in the frequency domain. ⃗ V EU T f : fundamental component of EUT voltage in the frequency domain. ⃗ V EU T h : h th harmonic component of EUT voltage in the frequency domain. α EU T : angle of fundamental component of EUT complex vector voltage. φ: EUT power factor. Same cases apply for currents by replacing v/V and i/I. Same cases apply for AUX inverter by replacing EUT by AUX. Variables denoted by prime refers to testbench parameters.

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Power Hardware-in-the-Loop Test Bench for Permanent Magnet Synchronous Machines based on a Parallel Hybrid Converter

Stefanski

Schmitz-Rode

Schwendemann

et al. 2022

2022 IEEE 23rd Workshop on Control and Modeling for Power Electronics (COMPEL)

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This poster presents a Power Hardware-in-the-Loop (PHIL) emulation test bench for emulating highly utilized permanent magnet synchronous machines (PMSM). The emulation converter of the PHIL test bench is a Cascaded H-bridge based Parallel Hybrid Converter (PHC) with a 17-level output voltage and a modulation frequency of 1 MHz. The nonlinear machine is emulated with a sampling frequency of 5 MHz and is implemented on the FPGA of a Real-Time Simulation System (RTSS)

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Comparison of Two Power Electronic Topologies for Power Hardware in the Loop Machine Emulator

Cited by 7 publications

References 8 publications

Opportunities and Challenges of Advanced Testing Approaches for Multi-Megawatt Wind Turbines

Opportunities and Challenges of Advanced Testing Approaches for Multi-Megawatt Wind Turbines

A Methodology for High-Power Drives Emulation Using a Back-to-Back Configuration

Power Hardware-in-the-Loop Test Bench for Permanent Magnet Synchronous Machines based on a Parallel Hybrid Converter

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