Integral‐series Fourier analysis of chaotic PWM patterns for common mode voltage stresses

Asefi, Mahdi; Nazarzadeh, Jalal

doi:10.1049/iet-pel.2017.0806

Cited by 13 publications

(5 citation statements)

References 26 publications

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“…Harmonic magnitude of CMV gives insight to the leakage current [44]. Double Fourier integral analysis is deployed to analyze the spectrum of CMV [45]. CMV v cm of a VSI is a function of harmonic component of phase leg output voltage C mn which is given as follows:…”

Section: Analysis On CMV and Leakage Current With 240cpwmmentioning

confidence: 99%

240$^\circ$-Clamped PWM Applied to Transformerless Grid Connected PV Converters With Reduced Common Mode Voltage and Superior Performance Metrics

Qamar

Korada

2022

IEEE Open J. Power Electron.

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Transformerless voltage source inverters (VSIs) are one of the popular topologies for photovoltaic (PV) gridconnected applications due to the lowest component count and simple design. Because of the absence of galvanic isolation in such systems, problem of electromagnetic interference (EMI) due to high leakage current is highly pronounced. Recently various reduced common mode voltage (CMV) PWM (RCMV-PWM) methods which address these issues of CMV, and leakage current have been proposed. These schemes typically function at the expense of increased total harmonic distortion (THD), higher switching loss, high DC link current stress along with limited modulation index range. In this work, 240 • clamped PWM (240CPWM) is selected as an ideal candidate for grid connected VSIs in terms of all round performance of switching loss, THD, DC link current stress, CMV and leakage current. 240CPWM is a relatively new space vector based PWM method which can attain much superior performance by avoiding the zero states. After a brief overview of the 240CPWM concept, the paper provides a detailed comparison of 240CPWM with conventional space vector PWM (CSVPWM) and discontinuous PWM (DPWM1) methods in terms of each of the above metrics. A 3-phase 208 V 3 kW silicon IGBT based hardware prototype is built to validate the performance of 240CPWM and compared with other popular schemes under grid-connected mode. Experimental results show a 66.7% reduction in the peak CMV and 50% reduction in leakage current with the proposed scheme as compared to CSVPWM. Also, THD, DC link current stress and inverter switching loss are greatly reduced as an added advantage using the proposed method. A new, combined performance index is proposed to compare the performance of different PWM schemes, and it is shown that the 240CPWM achieves the best value for this index among the PWM methods studied.

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Section: Analysis On CMV and Leakage Current With 240cpwmmentioning

confidence: 99%

240$^\circ$-Clamped PWM Applied to Transformerless Grid Connected PV Converters With Reduced Common Mode Voltage and Superior Performance Metrics

Qamar

Korada

2022

IEEE Open J. Power Electron.

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“…EMI engendered due to switching off power circuits inducing spurious voltage into the systems are reported in [22][23][24][25][26]. This section discusses the emergence of EMI and performance of ENLC over ACM in EMI mitigation.…”

Section: Emi Analysismentioning

confidence: 99%

“…The above-mentioned non-linearities present within DC-DC converters generate EMI [22][23][24][25][26]. The generated EMI degrades the circuit performance and results in current and voltage stress.…”

Section: Introductionmentioning

confidence: 99%

Performance comparison and stability analysis of ACM and ENLC controlled SEPIC PFC converter

Munuswamy¹,

Uma²,

Kavitha³

2020

IET Power Electronics

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In this study, a detailed comparison between two power factor correction (PFC) controls, viz., average current mode (ACM) control and enhanced non-linear carrier (ENLC) control for single-ended primary inductance converter (SEPIC) are made. In ACM control, a linear current reference, generated using the conventional method is compared with the inductor current. In ENLC control, a non-linear carrier current reference, generated using passive components is compared with switch current. The proposed ENLC control uses reduced components and sensors compared to ACM and conventional non-linear carrier control methods. The evolving of nonlinear phenomena during load variation is investigated along with the electromagnetic interference (EMI) study with power spectral density estimation. For stability enhancement and EMI mitigation, a detailed simulation study is performed using MATLAB/Simulink platform. Mathematical bifurcation analysis, by deriving critical phase angle is carried out to obtain a better insight of stability boundaries in order to access the system behaviour. Owing to the advantages of ENLC, an experimental setup of ENLC controlled SEPIC PFC converter was built to support the results.

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“…The CFM technology essentially expands the energy of spectral peaks to the adjacent frequency bands, which forms the effect of peaks shaving and valleys filling and achieves the result of suppressing the spectral peaks. The CFM includes periodic CFM [15][16][17], random CFM [18][19][20], and chaotic CFM [21][22][23]. Among them, the first two are used more.…”

Section: Introductionmentioning

confidence: 99%

Suppression of common‐mode voltage spectral peaks by using rotation reverse carriers in sinusoidal pulse width modulation three‐phase inverters with CFM

Huang

2020

IET Power Electronics

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The common-mode interference in three-phase inverters is a prominent problem and is hard to be suppressed. The common-mode voltage (CMV) is an important source of common-mode interference. The spectral peaks of CMV can be suppressed markedly through carrier frequency modulation (CFM) in three-phase inverters. The multi-carrier technology can be used to further suppress the spectral peaks of CMV, but it is not easy to achieve in the CFM case because of the changing carrier frequency. A new method, which is named the rotation reverse carriers (RRC) scheme, is presented to solve this problem here. In this scheme, the three-phase carriers reverse in turn so that some peaks can be counteracted in the CMV spectrum. This leads to a further reduction in spectral peaks of CMV based on the effect obtained by using CFM. Using the RRC scheme can also ensure the balance of three output voltages. In order to reduce the adverse effects on differential-mode characteristics, the RRC scheme is also optimised here. The total harmonic distortion is lowered by the use of an optimal RRC scheme. The feasibility and effectiveness of the proposed RRC scheme are verified by the simulations and experimental results in a threephase inverter.

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Integral‐series Fourier analysis of chaotic PWM patterns for common mode voltage stresses

Cited by 13 publications

References 26 publications

240$^\circ$-Clamped PWM Applied to Transformerless Grid Connected PV Converters With Reduced Common Mode Voltage and Superior Performance Metrics

240$^\circ$-Clamped PWM Applied to Transformerless Grid Connected PV Converters With Reduced Common Mode Voltage and Superior Performance Metrics

Performance comparison and stability analysis of ACM and ENLC controlled SEPIC PFC converter

Suppression of common‐mode voltage spectral peaks by using rotation reverse carriers in sinusoidal pulse width modulation three‐phase inverters with CFM

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