Effect of dead times on the values of input current harmonics drawn from the grid by a voltage-source active rectifier

Kus, Vaclav; Josefova, Tereza

doi:10.1109/ae.2014.7011692

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…THD of output voltage increases linearly with dead time. Dead times also generate lowfrequency harmonics, which are harder to filter and harmful for synchronous machines [23]. The presence of these low-frequency harmonics is explained based on the voltage V err aN (t) and its spectral decomposition is given by:…”

Section: Harmonics Generated By the Inverter's Imperfectionsmentioning

confidence: 99%

Comparative Study of IGBT and SiC MOSFET Three-Phase Inverter: Impact of Parasitic Capacitance on the Output Voltage Distortion

Poolphaka,

Jamshidpour,

Lubin

et al. 2023

Actuators

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This study investigates the nonlinearities in three-phase inverters for SiC-based systems and compares their performance to IGBT-based systems. An analytical model of inverter voltage distortion is developed, which accounts not only for dead time (td), switching delay time, switching frequency (fs), and voltage drops of power devices, but also for output parasitic capacitance (Cout). Experimental tests validate the model, which provides a more accurate estimate of the inverter’s output phase voltage distortion. The power device characteristics are obtained from datasheets, while Cout is determined through experimentation. Three-phase inverters with varying switching frequencies, fundamental frequencies, and dead-time values are used in simulations and experiments to determine the influence of nonlinearity on phase voltage deviation and current distortion. The results show that, due to SiC devices’ faster switching time, the phase voltage deviation and phase current distortion are lower in SiC-based inverters than in IGBT-based ones for high-frequency applications, as the dead time can be reduced.

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Section: Harmonics Generated By the Inverter's Imperfectionsmentioning

confidence: 99%

Comparative Study of IGBT and SiC MOSFET Three-Phase Inverter: Impact of Parasitic Capacitance on the Output Voltage Distortion

Poolphaka,

Jamshidpour,

Lubin

et al. 2023

Actuators

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“…To achieve the harmonic spectra, simulations or analytical calculations can be used [46]. Creating the spectra by simulation has the advantage that the influence of deadtime effects in the harmonic spectrum can be considered easily [47] (see Figure 11). The filter design is based on calculating differential-mode components in the line to ground voltage harmonics (using worst case spectrum) at the PCC for both designs and compared with the standards to constrain the design.…”

Section: Filter Designmentioning

confidence: 99%

SiC-MOSFET or Si-IGBT: Comparison of Design and Key Characteristics of a 690 V Grid-Tied Industrial Two-Level Voltage Source Converter

et al. 2021

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In this paper, a design driven comparison between two 190 kVA industrial three-phase two-level voltage source converter (2L-VSC) designs based in silicon carbide (SiC) and silicon (Si) for 690 V grids is presented. These two designs were conceived to have the same nominal power, while switching at reasonable switching speeds and requiring the same case to ambient thermal impedance. Under these conditions, the designs were studied to detect the potential gains and limitations that a pragmatic converter design could feature when using these two technologies regarding cost, efficiency, size and weight. To achieve this, experimentally determined semiconductor characteristics were used to perform simulations, the results of which were then used to design the essential parts of the converter. These designed parts were then corroborated with manufacturers, from which physical characteristics of all designed components were obtained. The results show that the SiC based design presents substantial weight savings and an 11% system cost reduction, while preserving its traditional characteristics such as improved overall efficiency when compared to the silicon based design under the given design requirements and constraints.

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“…There are two methods commonly used to compensate the dead time effect: voltage feedback and current feedback. The voltage feedback method can compensate the bad effect caused by the dead zone, but it needs to add the hardware circuit to detect the voltage value of each phase, and the structure is more complex [3]. The current feedback mode has some ambiguity in the zero-crossing of the current and it is difficult to determine directly and accurately [4].…”

Section: Introductionmentioning

confidence: 99%

A Inverter Dead-time Compensation Method Based on Phase current Polarity Determination and Voltage Partitioning

Zhao,

Xu,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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The introduction of the dead time of the inverter solves the straight-arm conduction problem of the upper and lower power devices of the inverter, but also leads to the deviation of the actual output voltage of the inverter from the given voltage. Dead time increases the harmonic components of phase voltage and phase current, which is also an important factor leading to motor torque ripple. In this paper, the mechanism of the deviation of phase voltage and phase current caused by the dead time of voltage space vector modulation is analyzed, and the effect of dead time on phase voltage and phase current harmonic components is studied. A simple and effective dead time compensation method based on phase voltage division and phase current polarity determination is proposed to directly compensate the dead time. This method can suppress the current harmonic and torque ripple in the running state of the motor, and can greatly simplify the calculation process of the traditional dead time compensation method. Through the system modeling and simulation, it is verified that the method can significantly improve the current waveform distortion, and has good practical value.

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Effect of dead times on the values of input current harmonics drawn from the grid by a voltage-source active rectifier

Cited by 6 publications

References 10 publications

Comparative Study of IGBT and SiC MOSFET Three-Phase Inverter: Impact of Parasitic Capacitance on the Output Voltage Distortion

Comparative Study of IGBT and SiC MOSFET Three-Phase Inverter: Impact of Parasitic Capacitance on the Output Voltage Distortion

SiC-MOSFET or Si-IGBT: Comparison of Design and Key Characteristics of a 690 V Grid-Tied Industrial Two-Level Voltage Source Converter

A Inverter Dead-time Compensation Method Based on Phase current Polarity Determination and Voltage Partitioning

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