Evaluation of core loss in magnetic materials employed in utility grid AC filters

Beres, Remus Narcis; Wang, Xiongfei; Blaabjerg, Frede; Bak, Claus Leth; Matsumori, Hiroaki; Shimizu, Toshihisa

doi:10.1109/apec.2016.7468298

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…For instance, the relative permeability of ferrite cores (Mn-Zn) is around 5000∼10000, and the relative permeability of powder cores is around 20∼200. Measuring the actual value of the core loss in these materials is essential, to ensure an optimum thermal design for the passive component (7)- (10) .…”

Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of Electrical and Calorimetric Methods to Estimate Core Loss in Powder Cores

et al. 2019

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The utilization of powder cores for many power electronic applications has drawn a significant amount of attention owing to their attractive magnetic properties. However, because of their low relative permeability characteristics, a precise measurement of the core loss is very difficult to obtain. Imprecise estimation of the core loss may lead to an inaccurate thermal design of power converters. Measuring and calculating the accurate value of the core loss allows the circuit designer to design a more efficient system. This paper discusses the revalidation of electrical measurement by comparing the electrical method with the calorimetric method in powder cores. The calorimetric method is one of the most promising methods to accurately measure the core loss; however, it is time consuming. A difference less than 10% has been reported for the core loss measurement error while comparing the electrical method and the calorimetric method in various conditions. These results indicate that the electrical method using the B-H analyzer is effective for measuring the core losses in some conditions for powder cores. Along with the theoretical discussion, simulation and experimental tests are also conducted.

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Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of Electrical and Calorimetric Methods to Estimate Core Loss in Powder Cores

et al. 2019

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“…The PSO method based on swarm intelligent algorithms is an optimization tool for unconstrained optimization problems. Due to this, constraints defined in the optimization problem in Equation (8) are added to the cost function in the form of penalty functions. The PSO method is initialized with a population number of 100 particles with the maximum number of iterations set to 400.…”

Section: Determined Pulse Patterns and Comparison With Other Methodsmentioning

confidence: 99%

“…?a,c), the conclusion can be made that the BF method provides more continuous (less noisiness) pulse patterns and that the on/off switching time is much higher for the whole range of the modulation index (m) than for the pulse patterns obtained with the PSO method. in Equation (8) are added to the cost function in the form of penalty functions. The PSO method is initialized with a population number of 100 particles with the maximum number of iterations set to 400.…”

Section: Determined Pulse Patterns and Comparison With Other Methodsmentioning

confidence: 99%

Pulse Pattern Optimization Based on Brute Force Method for Medium-Voltage Three-Level NPC Converter with Active Front End

et al. 2020

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Nowadays, regulation standards regarding the injection of harmonics in the grid power supply are becoming stricter. These standards have a direct impact on the design and control of converters, especially in medium-voltage drives. To fulfil these standards, converters are designed to work with the power factor as close to unity as possible and to correct the harmonics spectrum in case of a grid power supply with multiple resonances. The preferred modulation technique for medium-voltage drives is usually selective harmonic elimination pulse width modulation. This approach requires a precise calculation of pulse patterns (switching angle vs. modulation index) with additional constraints. This research presents a new approach for the determination of optimal pulse patterns. The technique ensures the elimination of low-order harmonics and minimization of some high-order ones. The proposed technique incorporates the additional constraints regarding minimum on/off switching time (pulse duration) and ensures the continuity of pulse patterns. Optimal pulse patterns are determined with the brute force method which searches the feasible solution space by use of the Jacobian matrix null space. Determined pulse patterns are verified by the simulation and experimental measurements.

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“…In [20], multilevel waveforms are separated into a summation of two-level pulse trains with the PDPWM strategy. Using the PWM voltage analytical solution, more depth of understanding and design improvement of converters is established; such as, calculation of inverter dc-link current harmonics [21], Common Mode (CM) voltage reduction [22], [23], sampling delay effects characterization [24], and Magn etic core loss calculations [25].…”

Section: Introductionmentioning

confidence: 99%

Modular Multilevel Converter Switching Frequency Harmonics Analysis and Suppression Through Cell Voltage Control

Wang

Shi

Bosworth

et al. 2020

IEEE Open J. Power Electron.

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This paper investigates the impact of reference's bias on the high frequency voltage spectrum for the modular multilevel converters (MMC). Analytical solution of the voltage spectrum under carrier Phase Shifted Pulse Width Modulation (PSPWM) is derived using double Fourier integral analysis. The distribution of the switching frequency voltage harmonics is found to be directly related to the ratio between the dc-link voltage and the cell voltage. A control method utilizing this phenomenon is thereby proposed to suppress switching frequency harmonics in the Differential Mode Voltage (DMV) and Common Mode Voltage (CMV). Cell voltage control trade-offs considering different cell numbers, different ac voltages, 3 rd harmonics injection, and cell voltage stress are also investigated. The analysis and control method are validated through experiments on a 1.25 megawatt MMC testbed. INDEX TERMS Common mode voltage, differential mode voltage, double Fourier integral, harmonics suppression, modular multilevel converter, phase-shifted PWM, switching harmonics.

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Evaluation of core loss in magnetic materials employed in utility grid AC filters

Cited by 11 publications

References 21 publications

Comparative Evaluation of Electrical and Calorimetric Methods to Estimate Core Loss in Powder Cores

Comparative Evaluation of Electrical and Calorimetric Methods to Estimate Core Loss in Powder Cores

Pulse Pattern Optimization Based on Brute Force Method for Medium-Voltage Three-Level NPC Converter with Active Front End

Modular Multilevel Converter Switching Frequency Harmonics Analysis and Suppression Through Cell Voltage Control

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