Reducing root‐mean‐square current stress on the DC link capacitor of a five‐phase electric drive through multiple carrier pulse‐width modulation technique

Diana, Michela; Maqsood, Atif; Corzine, Keith; Guglielmi, Paolo; Parsa, Leila

doi:10.1049/iet-epa.2019.0181

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…It is evident from Figure 1a that the current fluctuations of dc-link capacitor is determined by the switching states of VSI because the dc-link capacitors between the batteries and switching devices provide a low impedance passage, through which the large harmonic current caused by the high-frequency switching events can flow. Thus, in order to improve the service-life of dc-link electrolytic capacitors, various dc-link capacitor current fluctuations reduction methods based on the modified PWM sequences have attracted considerable research over recent years [8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Current fluctuations reduction strategy based on optimal three‐space‐vector pulse‐width modulation for service‐life improvement of DC‐link electrolytic capacitors in three‐phase voltage‐source inverter system

Li,

Shen,

Tang

et al. 2023

IET Electric Power Appl

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The authors propose a current fluctuation reduction strategy based on optimal three‐space‐vector pulse‐width modulation (TSVPWM), which is used to improve the service‐life of the dc‐link electrolytic capacitors in two‐level three‐phase voltage‐source inverter (VSI) system. Differing from the typical SVPWM‐based method that employs two adjacent active voltage vectors and zero voltage vectors to synthesise the reference voltage, the proposed strategy selects the required voltage vectors based on the minimum dc‐link electrolytic capacitor current fluctuation. With the proposed strategy, an objective function for the root‐mean‐square value of dc‐link electrolytic capacitor current is first constructed under the constraint of eight permissible voltage vectors. And then, by solving the minimum of the objective function through the piecewise linear programming, the optimal three voltage vectors under the different modulation ratios and load power factors are obtained accordingly, so as to achieve the minimum dc‐link electrolytic capacitor current fluctuations during each switching period. Meanwhile, a PWM implementation scheme based on positive–negative double carrier signals is presented, which not only simplifies the implementation process but also effectively reduces the switching losses of power devices. Finally, the experimental results demonstrate that the proposed strategy can minimise the dc‐link electrolytic capacitor current fluctuation under different working conditions.

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Section: Introductionmentioning

confidence: 99%

Current fluctuations reduction strategy based on optimal three‐space‐vector pulse‐width modulation for service‐life improvement of DC‐link electrolytic capacitors in three‐phase voltage‐source inverter system

Li,

Shen,

Tang

et al. 2023

IET Electric Power Appl

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“…Continuous SVPWM (CSVPWM) and Discontinuous SVPWM (DSVPWM) have been discussed in [23], [24], and [25] increasing the lifespan of the associated transistors and DC link capacitors. The DC current stress has been addressed in [26] through multi-carrier technique, in [27] and [28] through CMV(Common mode voltage), and using a novel switching pattern in [29], [30], and [31].…”

Section: Introductionmentioning

confidence: 99%

Mitigation of Harmonics Using Novel Sector-Based Switching Pattern Space Vector Pulse Width Modulation

Mohiuddin

Maricar²,

Kadir

et al. 2023

IEEE Access

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Pulse Width Modulation (PWM) driven power converters are widely used in realizing the function of rectification and inversion in renewable and emerging power applications. They play a key role in tying renewable energy sources of solar and wind to conventional energy grid systems. Such emergying styles of power systems are referred to as Distributed Generation (DG) or energy mix. The PWM-based switching devices are also sources for injecting harmonics to degrade the quality level in this emerging style of DG systems causing steady-state waveform distortion. Thus power converters operated by finely tuned PWM play an important role in mitigating the voltage waveform distorting harmonics and consequently improving the stability of the system. This paper presents the mitigation of harmonic contents by reproducing as a novel space vector-based switching pattern of SVPWM. In this work, the proposed switching pattern will have a DC link RMS current equal to or less than that of a conventional SVPWM current under the same switching frequency (SF), load, L-C filter, DC bus voltage, and Modulation Index (MI). The results include a 13.43% improvement in Total Harmonic Distortion (THD) at relatively high modulation indices. The Weighted Total Harmonic Distortion (WTHD) has also improved by 47.37% and the number of thyristors has been reduced lowering switching losses. The Matlab-Simulink simulation results have been experimentally verified with an Advanced Digital Analog Learning Module (ADALM M2k)-based experimental setup, improving the proposed SVPWM THD by 13.49%. The conventional and proposed SVPWM performance comparison is done by obtaining Fast Fourier Transform (FFT) by driving a two-level three-phase voltage source inverter.

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Review of the calculation of DC-link capacitor current

et al. 2023

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In the voltage source power electronic converter, DC-link capacitors usually work as buffering elements between the DC and AC sides. The high failure rate and large space occupied by the DC-link capacitors directly affect the reliability and power density of the converters. The analysis and calculation of the DC-link capacitor current is crucial to achieve the refined design of converters. In this work, the analysis and calculation methods of DC-link capacitor current are divided into three categories, according to the calculation principle, namely, simulation method, RMS analysis method, and spectral analysis method, and their calculation methods are summarized. First, the types of capacitors and their characteristics are briefly introduced. Second, the three-phase two-level converter is taken as an example to introduce the basic principles, calculation steps, application scope, advantages, and disadvantages of the latter two methods in detail, as well as the influence of non-ideal factors, such as the output ripple on the calculation results. This work also discusses the calculation of the multi-level converter’s DC-link capacitor current spectrum and the current characteristics of multi-phase converters, which are rarely reported. Third, the problem of resonance between the DC-link capacitors and the DC bus inductor is introduced. For the distributed arrangement of multiple DC-link capacitors on DC bus converters, this study proposes a method based on a constant current source equivalent circuit, which can accurately calculate the DC-link capacitor current spectrum that is affected by loop current and resonance. Finally, the current problems and future directions of the DC-link capacitor design are pointed out.

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Reducing root‐mean‐square current stress on the DC link capacitor of a five‐phase electric drive through multiple carrier pulse‐width modulation technique

Cited by 3 publications

References 22 publications

Current fluctuations reduction strategy based on optimal three‐space‐vector pulse‐width modulation for service‐life improvement of DC‐link electrolytic capacitors in three‐phase voltage‐source inverter system

Current fluctuations reduction strategy based on optimal three‐space‐vector pulse‐width modulation for service‐life improvement of DC‐link electrolytic capacitors in three‐phase voltage‐source inverter system

Mitigation of Harmonics Using Novel Sector-Based Switching Pattern Space Vector Pulse Width Modulation

Review of the calculation of DC-link capacitor current

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