Theoretical Harmonic Spectra of PWM Waveforms Including DC Bus Voltage Ripple—Application to a Low-Capacitance Modular Multilevel Converter

Thakur, Sumeet Singh; Odavić, Milijana; Allu, Ahmed A.; Zhu, Zhe; Atallah, K.

doi:10.1109/tpel.2020.2974156

Cited by 19 publications

(21 citation statements)

References 37 publications

(77 reference statements)

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“…In [33], an extensive Fourier analysis on the emissions from a switching model of a single-phase converter is provided. Accordingly, base-band, side-band and DC components are identified mathematically depending on the multi-frequency components in non-ideal v abc(ref ) and v dc .…”

Section: Patterns Of Frequency Couplingsmentioning

confidence: 99%

“…The dq-frame models are useful for control design and stability analysis but lack the analysis of unbalanced systems [8]- [9], [14], [19]. A variety of stationary-frame models are developed to enhance the models by including the effects of Phase-Locked-Loop (PLL) systems [13]- [14] [16], DC-link dynamics [16], [23], phase-dependent features [24], system asymmetries [25]- [26] and couplings [14], [23]- [33]. There has been special attention to the frequency and sequence couplings [14], [23]- [33], especially for Modular Multi-level Converters (MMC) [23], [25]- [33].…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the modelling and model-order reduction challenges in a MW-scale test environment have not been investigated abundantly. Reference [33] provides an excellent theoretical analysis for harmonic emissions by adopting Fourier transform on the switching model of a single-phase converter.…”

Section: Introductionmentioning

confidence: 99%

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Generic Multi-Frequency Modelling of Converter-Connected Renewable Energy Generators Considering Frequency and Sequence Couplings

Nouri

Kocewiak

Shah

et al. 2022

IEEE Trans. Energy Convers.

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Frequency and sequence couplings can compromise the trustworthiness of multi-frequency models for converterbased systems. There have been effective attempts to address the couplings mainly by linearized averaged models. Only a few studies have been conducted on practical optimization of such models with enormous matrices and experimental results. This paper provides a generic theory for coupling patterns and proposes a multi-frequency modelling method to detect and address only the main couplings in the sequence domain for converter-connected renewable energy generators. The proposed generic model is based on empirical tests using small-signal perturbations and adopting Fourier transform on the switching converter response. The proposed theory and modelling methodology are verified using a 7MVA grid emulator for voltage perturbation tests on a 2MVA photo-voltaic converter. Accordingly, the couplings can exist in more generic forms, including multiples of perturbation and fundamental frequencies. To the best of our knowledge, the patterns with the multiples of the perturbation frequency have been overlooked in the literature. Furthermore, the mirror frequency concept is valid for all coupling patterns and is included in the proposed model. Besides, the proposed patterns and the environment noise levels have been practical criteria for selecting the main couplings.

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Section: Patterns Of Frequency Couplingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Generic Multi-Frequency Modelling of Converter-Connected Renewable Energy Generators Considering Frequency and Sequence Couplings

Nouri

Kocewiak

Shah

et al. 2022

IEEE Trans. Energy Convers.

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show abstract

“…6. Spectral analysis of PWM waveforms generated according to such an approach was presented in [22]. Nevertheless, the same goal can be achieved in case the modulation signal corrections, presented in Fig.…”

Section: DC Link Oscillations Compensation Through the Modulationmentioning

confidence: 93%

“…Let the modulation signal be defined as (21). For an arbitrary frequency component m i (t) and a fixed value of k = 0, expression (20) can be rewritten as (22).…”

Section: B Regular Samplingmentioning

confidence: 99%

Comprehensive Spectral Analysis of PWM Waveforms With Compensated DC-Link Oscillations

Milovanović

Dujić

2020

IEEE Trans. Power Electron.

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Why state-of-the-art analytical models for eddy current losses in PM of PMSM are insufficient for variable speed motors

Königs,

Löhlein

2024

Elektrotech. Inftech.

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This is the third paper in a series on novel methods for calculating eddy current losses in permanent magnets (PM) and the shortcomings of previously conducted analyses. In the first paper, Ruoho’s work on homogeneous materials was discussed. The distribution of fields has been expanded to include the reaction field of the eddy currents within the permanent magnets. This approach was based on the methods of the harmonic complex AC calculation. In the second paper, the models were expanded to enable a harmonic calculation of eddy current losses in permanent magnets for homogeneous fields including the effects of eddy current losses in an adjacent ferromagnetic material, leakage flux factors, and source behavior. In this third and final publication, a look at state-of-the-art analytical models will be taken. With regard to the results of the second publication of this series, it can be shown that established analytical models are insufficient when calculating inverter-related eddy current losses in permanent magnets of permanent magnet synchronous machines (PMSM). Furthermore, a short introduction to eddy current loss mechanics in permanent magnets of PMSM will be given.

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Theoretical Harmonic Spectra of PWM Waveforms Including DC Bus Voltage Ripple—Application to a Low-Capacitance Modular Multilevel Converter

Abstract: This is a repository copy of Theoretical harmonic spectra of PWM waveforms including dc bus voltage ripple -Application to low-capacitance modular multilevel converter.

Cited by 19 publications

References 37 publications

Generic Multi-Frequency Modelling of Converter-Connected Renewable Energy Generators Considering Frequency and Sequence Couplings

Generic Multi-Frequency Modelling of Converter-Connected Renewable Energy Generators Considering Frequency and Sequence Couplings

Comprehensive Spectral Analysis of PWM Waveforms With Compensated DC-Link Oscillations

Why state-of-the-art analytical models for eddy current losses in PM of PMSM are insufficient for variable speed motors

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