Abstract
This study was conducted to develop a design method of power density and efficiency maximization for three-phase pulse-width modulated (PWM) inverters that include AC filter. A tradeoff relationship exists between power density and efficiency. In general, increasing the switching frequency is known to increase the switching device loss and decrease the volume of the passive components. A three-phase PWM inverters design should consider the balance between conversion efficiency and inverter volume. However, best of our knowledge, no practical study has focused on the optimal design of a three-phase PWM inverter that includes an AC filter. This is because the iron loss of the AC filter inductor changes in complicated ways depending on the DC-bias excitation, amplitude of switching ripple current, etc. Therefore, the present authors clarified this iron loss mechanism and realized a highly accurate iron loss calculation method in previous studies. In this paper, the relationship between efficiency and volume for the switching frequency was analyzed when the AC filter inductor was designed for minimal loss by adjusting the core diameter, height, and number of winding turns. The efficiency and volume optimization achieved by designing a proper inductor was verified via comparison with a base design.
Highlights
A power electronics converter requires both high power density and high efficiency.1–5 a tradeoff relationship exists between power density and efficiency
The reason for this lack of research progress is that the iron loss of the inductor changes in complicated ways depending on the switching ripple current, DC-bias excitation, and other factors
The iron loss PFe of the AC filter inductor used in the three-phase pulse width modulation (PWM) inverter was divided into two losses expressed by the total value of the low- and high-frequency iron losses (PLF and PHF, respectively), as reported in Ref. 7: PInductor = PCu + PFe = PCu + PLF + PHF
Summary
A power electronics converter requires both high power density (expressed in watts per unit volume) and high efficiency. a tradeoff relationship exists between power density and efficiency. By means of increasing the switching frequency, the volume of passive components (i.e., transformers and inductors) can be reduced. To the best of the authors’ knowledge, no studies have yet been reported on design methods for a pulse width modulation (PWM) inverter that includes an AC filter inductor.. To the best of the authors’ knowledge, no studies have yet been reported on design methods for a pulse width modulation (PWM) inverter that includes an AC filter inductor.6 The reason for this lack of research progress is that the iron loss of the inductor changes in complicated ways depending on the switching ripple current, DC-bias excitation, and other factors.. The relationship between efficiency and volume for the switching frequency was analyzed when the AC filter inductor was designed for minimal loss by adjusting the core diameter, height, and number of winding turns. The design method was validated via a comparison of the simulation and experimental results
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