Analytical technique for calculating the output harmonics of an H-bridge inverter with dead time

Wu, C.M.; Lau, Wing Cheong; Chung, Henry Shu-Hung

doi:10.1109/81.762927

Cited by 81 publications

(62 citation statements)

References 8 publications

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“…Consequently, the inductive behavior of the filter and grid upstream yields to a reduction in the induced current harmonics due to the higher impedance of these inductances at the new frequencies. However, it is important to note that the IGBTs' dead-time limits the validity of the said statement, leading to the emergence of low-frequency harmonics (mainly 5 th and 7 th order) [10], [11] with a growing impact at higher SFs. Nevertheless, this effect can be mitigated by current regulators, whose bandwidth use to fall within these values.…”

Section: Switching Frequency and Current Harmonicsmentioning

confidence: 99%

Improved efficiency of local EPS through variable switching frequency control of distributed resources

Cano

Suárez

Navarro-Rodríguez

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-This contribution explores the possibility of improving the global efficiency of three-phase inverter-based distributed resources (DR) embedded in low-voltage (LV) distribution feeders, by the adaptation of their switching frequency (SF) to the operation point of both the converter and local loads. The core of this proposal lies on the fact that in a good number of applications, in both services and residential sectors, the owner of the DR is also in charge of the losses caused in the local electric power system (EPS). This fact leaves room for a global optimization of the power losses, i.e, converter losses will be considered together with those losses caused by the current harmonics injected into the local grid. A dynamic adaptive SF frame of the DR is considered in this proposal to allow its operation beyond its rated frequency at light loads, subjected to the thermal constraints of the device. Simulation results obtained using PLECS software as well as an experimental validation of the method are included.

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Section: Switching Frequency and Current Harmonicsmentioning

confidence: 99%

Improved efficiency of local EPS through variable switching frequency control of distributed resources

Cano

Suárez

Navarro-Rodríguez

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…Durch die Wahl einer niedrigeren Schaltfrequenz können die Verzerrungen eines Schaltverstärkers ohneÄnderung der Hardware reduziert werden. Diese Art der Verzerrungäußert sich qualitativ als Addition ungerader Oberwellen (Mosely et al, 1999;Evans und Close, 1987;Tan et al, 2003;Wu et al, 1999 …”

Section: Design Mit Niedriger Schaltfrequenzunclassified

Realisierung eines verzerrungsarmen Open-Loop Klasse-D Audio-Verstärkers mit SB-ZePoC

Schnick

Mathis

2007

Adv. Radio Sci.

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Abstract. In den letzten Jahren hat die Entwicklung von Klasse-D Verstärkern für Audio-Anwendungen ein vermehrtes Interesse auf sich gezogen. Eine Motivation hierfür liegt in der mit dieser Technik extrem hohen erzielbaren Effizienz von über 90%. Die Signale, die Klasse-D Verstärker steuern, sind binär. Immer mehr Audio-Signale werden entweder digital gespeichert (CD, DVD, MP3) oder digital übermittelt (Internet, DRM, DAB, DVB-T, DVB-S, GMS, UMTS), weshalb eine direkte Umsetzung dieser Daten in ein binäres Steuersignal ohne vorherige konventionelle D/A-Wandlung erstrebenswert erscheint. Die klassischen Pulsweitenmodulationsverfahren führen zu Aliasing-Komponenten im Audio-Basisband. Diese Verzerrungen können nur durch eine sehr hohe Schaltfrequenz auf ein akzeptables Maß reduziert werden. Durch das von der Forschungsgruppe um Prof. Mathis vorgestellte SB-ZePoC Verfahren (Zero Position Coding with Separated Baseband) wird diese Art der Signalverzerrung durch Generierung eines separierten Basisbands verhindert. Deshalb können auch niedrige Schaltfrequenzen gewählt werden. Dadurch werden nicht nur die Schaltverluste, sondern auch Timing-Verzerrungen verringert, die durch die nichtideale Schaltendstufe verursacht werden. Diese tragen einen großen Anteil zu den gesamten Verzerrungen eines Klasse-D Verstärkers bei. Mit dem SB-ZePoC Verfahren lassen sich verzerrungsarme Open-Loop Klasse-D Audio-Verstärker realisieren, die ohne aufwändige Gegenkopplungsschleifen auskommen. Class-D amplifiers are suiteble for amplification of audio signals. One argument is their high efficiency of 90% and more. Today most of the audio signals are stored or transmitted in digital form. A digitally controlled Class-D amplifier can be directly driven with coded (modulated) data. No separate D/A conversion is needed. Classical modulation schemes like Pulse-Width-Modulation (PWM) cause aliasing. So a very high switching rate is required to minimize the aliasing component within the signal band. This paper shows a first implementation of the new SB-ZePoC modulation scheme (Zero Position Coding with Separated Baseband), which allows the generation of a binary signal with separated baseband. Therefore Class-D amplifiers using SB-ZePoC can be run with very low switching rates. Some benefits and problems in the design process because of low switching rates will be discussed. Measurements of a realtime implementation will be presented.

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“…This method is named by a double Fourier series (DFS) algorithm. During the last years, the application of DFS for analyzing harmonics of the voltage source converter (VSC) topologies, such as single-phase VSC, three-phase VSC, diode-clamped and cascaded multilevel converters, has been researched by many authors [4]- [7]. However, there is no any research on application of DFS for the MMC.…”

Section: Introductionmentioning

confidence: 99%

Application of Double Fourier Series for Analyzing Harmonics of a Modular Multilevel Converter

Quach¹,

Chae²,

Kang³

et al. 2017

REPQJ

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Abstract. This paper presents an application of doubleFourier series (DFS) algorithm for analyzing harmonics of a modular multilevel converter (MMC). By considering the effect of arm inductor, the application of DFS for calculating harmonics in the MMC is made. The DFS is then verified by comparing with simulation results used the fast Fourier transform (FFT) algorithm. Subsequently, the DFS will be used to analyze the effect of number of output voltage levels to the distribution of harmonics and total harmonic distortion (THD) in the MMC. The analytical results are performed in the Matlab programming in order to verify the theoretical analysis.

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Analytical technique for calculating the output harmonics of an H-bridge inverter with dead time

Cited by 81 publications

References 8 publications

Improved efficiency of local EPS through variable switching frequency control of distributed resources

Improved efficiency of local EPS through variable switching frequency control of distributed resources

Realisierung eines verzerrungsarmen Open-Loop Klasse-D Audio-Verstärkers mit SB-ZePoC

Application of Double Fourier Series for Analyzing Harmonics of a Modular Multilevel Converter

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