Conference Paper
Analysis of DCLink capacitor losses in threelevel neutral point clamped and cascaded HBridge voltage source inverters
Univ. of Southampton, Southampton, UK
DOI: 10.1109/ISIE.2010.5637820 Conference: Industrial Electronics (ISIE), 2010 IEEE International Symposium on Source: IEEE Xplore
 Citations (6)
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Conference Paper: The DClink capacitor current in pulsed singlephase Hbridge inverters
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ABSTRACT: In case of controlling a pulsed singlephase Hbridge inverter with two and three voltage levels the capacitor currents in the DClink circuit are calculated analytically. For these calculations first a sinusoidal modulated voltage and sinusoidal current at the output of the inverter are presupposed. Afterwards the additional load of the DClink capacitors caused by harmonic currents of the output filter circuit is examined. For this reason the individual harmonics of the DClink current with sinusoidal and with overlaid harmonic output currents are calculated with help of spectral analysis. At last the influence of the switching processes to the DClink circuit load is discussed. The theoretically determined currents in the DClink capacitors are compared with several practical measurementsPower Electronics and Applications, 2005 European Conference on; 01/2005  [Show abstract] [Hide abstract]
ABSTRACT: Accurate identification of a DClink ripple current is an important part of switched powerconverter design, since the spectral content of this current impacts on DC buscapacitor lifetime, the stability of the converter control, and the electromagneticinterference (EMI) performance of the system. Conventionally, the RMS magnitude of the ripple current is used to evaluate this impact, but this approach does not readily differentiate between pulsewidthmodulation (PWM) strategies, and can be challenging to evaluate for more complex converter topologies. This paper presents a new generalized approach that analytically determines the harmonic spectrum of the DClink and DCbus capacitor currents for any voltagesource switched converter topology. The principle of the strategy is that the product of a phaselegswitching function and its load current in the time domain, which defines the switched current flowing through the phase leg, can be evaluated in the frequency domain by convolving the spectra of these two timevarying functions. Since PWM has a discrete linefrequency spectrum, this convolution evaluates as an infinite summation in the frequency domain, which reduces to a simple frequency shift of the PWM spectrum when the load current is assumed to be a fundamental singlefrequency sinusoid. Hence, the switched currents flowing through the phase legs of an inverter can be evaluated as a summation of harmonics for any PWM strategy or inverter topology and can then be readily combined using superposition to determine the DClink and DC buscapacitor currents. The analytical approach has been verified against experimental results for an extensive range of twolevel and multilevel converter topologies and PWM strategies.IEEE Transactions on Industry Applications 11/2009; · 1.67 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: A simple analytical expression for the current stress on the DClink capacitor caused by the loadside inverter of a voltage DClinkconverter system is derived. The DClink capacitorcurrent RMS value is determined from the modulation depth and by the amplitude and the phase angle of the inverter output current assuming a sinusoidal inverter output current and a constant DClink voltage. Despite neglecting the outputcurrent ripple, the results of the analytical calculation are within 8% of measurements made from digital simulation and an experimental system, even if the outputcurrent ripple is relatively high as in the case of lowfrequency IGBT inverter systems. The simple analytical expression provides significant advantages over simulation methods for designing the DClink capacitor of PWM converter systemsIEE Proceedings  Electric Power Applications 08/2006; · 0.55 Impact Factor
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