An Algebraic Algorithm for Motor Voltage Waveform Prediction in Dual-LCI Drives With Interconnected DC-Links

Mohamadian, Sobhan; Castellan, S.; Tessarolo, Alberto; Ferrari, G.; Shoulaie, Abbas

doi:10.1109/tec.2015.2511198

Cited by 14 publications

(3 citation statements)

References 19 publications

(30 reference statements)

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“…The windings of the AC motors should be able to survive significant high-voltage spikes, and high dv/dt caused by the VFD output waveforms. Such spikes can potentially create partial discharges, which can possibly damage the winding insulation [15]. VFDs are also known for inducing bearing currents failures due to unwanted common-mode voltages and currents that are inherent to VFDs topologies [16].…”

Section: Machine Compatibility: Induction Vs Synchronous Machinesmentioning

confidence: 99%

Instantaneous Electromagnetic Torque Components in Synchronous Motors Fed by Load-Commutated Inverters

et al. 2021

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This paper proposes time-domain analytical expressions of the instantaneous pulsating torque components in a synchronous machine air gap when supplied by a load-commutated-inverter (LCI) system. The LCI technology is one of the most used variable frequency drives when very high power and low speed are required in applications such as pipeline recompression and decompression, as well as liquefied natural gas compression. In such applications, synchronous motors are used because of their high efficiency resulting from a separated supply of the current to their rotor through the excitation circuit. These applications usually have long and flexible shafts, which are very sensitive to torsional vibration excitation when their natural frequencies interact with any external torque applied to the shaft. A torsional analysis is required by international standards to assess the survivability of the shaft through the overall speed range of the motor. Therefore, the magnitude and frequencies of the motor air-gap torque are needed for such evaluation. The proposed developments are supported by numerical simulations of LCI systems in a large range of operation range. From the simulation results, torque harmonic families are derived and expressed in a parametric form, which confirm the accuracy of the proposed relationships.

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Section: Machine Compatibility: Induction Vs Synchronous Machinesmentioning

confidence: 99%

Instantaneous Electromagnetic Torque Components in Synchronous Motors Fed by Load-Commutated Inverters

et al. 2021

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“…An offline simulation of the power converters and power system applications in a software environment such as MATLAB/Simulink, PLECS, PSim, Dig SILENT, and Multisim was widely used to verify the design considerations and behaviors of circuits [3]. Although an offline simulation is a low-cost method and requires little setup, it is unacceptable in power electronics and power system applications as they suffer from high jitter, and their Energies 2021, 14, 5134 2 of 17 results are not reliable [4]. Offline simulations do not represent real circuit behavior and provide unrealistic and incorrect results [5].…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Power Quality Analyzer Applied to Hardware-in-Loop Test Bench

et al. 2021

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Integration of renewable energy resources and conventional grids leads to an increase in power quality issues. These power quality issues require different standards to be followed for accurate measurement and monitoring of various parameters of the power system. Conventional power quality analyzers (PQAs) are programmed to a particular standard and cannot be reconfigured by the end user. Therefore, conventional PQAs cannot meet the challenges of a rapidly changing grid. In this regard, a Compact RIO-based (CRIO-based) PQA was proposed, that can be easily reprogrammed and cope with the challenges faced by conventional PQAs. The salient features of the proposed PQA are a high processing speed, interactive interface, and high-quality data-storage capacity. Moreover, unlike conventional PQAs, the proposed PQA can be monitored remotely via the internet. In this research, a hardware-in-loop (HIL) simulation is used for performing the power-quality assessment in a systematic manner. Power quality indices such as apparent power, power factor, harmonics, frequency disturbance, inrush current, voltage sag and voltage swell are considered for validating the performance of the proposed PQA against the Fluke’s PQA 43-B.

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“…It is possible to evaluate the performance of the complex designed system under different working conditions by offline simulation before it enters the manufacturing stage. Since the mathematical model of electric power system devices such as electrical machines and transformers includes differential equations, the running time of their model in the above-mentioned environments is significant compared to the real time [1], [2]. Furthermore, the offline nature of simulations yields unwanted differences with respect to the experiments carried out in real time [3].…”

Section: Introductionmentioning

confidence: 99%

Power System Real-Time Emulation: A Practical Virtual Instrumentation to Complete Electric Power System Modeling

Parizad

Mohamadian

Iranian

et al. 2019

IEEE Trans. Ind. Inf.

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Hardware-in-the-loop (HIL) simulation is a technique that is being used increasingly in the development and test of complex systems. Real-world testing of an intricate system in a field like power plant can be challenging, time-consuming, expensive, and hazardous. HIL emulators allow engineers to test devices thoroughly and efficiently in a virtual environment with high reliability and minimum risk of defect. In this paper, the complete electric power system (including generator, turbinegovernor, excitation system, transmission lines, transformer, external grid and related loads) is implemented in MATLAB/Simulink environment. Different virtual instrument (VI) pages are modeled in the graphical programming language of LabVIEW which enable fast and reliable measurement functions such as data acquisition, archiving, real-time graphical display and processing. The interaction between MATLAB and LabVIEW is accomplished by generating a Phar Lap ETS Targets *.dll file which enables the two software to exchange real-time data. Also, a real 1518 kW excitation system is considered as a test case for introduced HIL system. This equipment is connected to LabVIEW software through a National Instrument PXI technology. Different scenarios (electrical frequency/active power change, voltage step response and etc.) are simulated in the designed Power System Emulator (PSE). The validity of implemented model for excitation system is verified by finding good matching between MATLAB and HIL simulation results. Index Terms-hardware-in-the-loop (HIL), LabVIEW, power system emulator (PSE), real-time simulation, virtual instrument.

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An Algebraic Algorithm for Motor Voltage Waveform Prediction in Dual-LCI Drives With Interconnected DC-Links

Cited by 14 publications

References 19 publications

Instantaneous Electromagnetic Torque Components in Synchronous Motors Fed by Load-Commutated Inverters

Instantaneous Electromagnetic Torque Components in Synchronous Motors Fed by Load-Commutated Inverters

Reconfigurable Power Quality Analyzer Applied to Hardware-in-Loop Test Bench

Power System Real-Time Emulation: A Practical Virtual Instrumentation to Complete Electric Power System Modeling

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