Nowadays, with the trends of having more electrical aircrafts with predominately composite structures, designers must be sure that electrical equipment inside is well-protected in case of lightning. It is for that purpose that a modeling approach is detailed in order to predict the impact of lightning on electrical equipment inside aircraft. An aircraft-like structure is defined with several electrical configurations. And direct or induced current inside different cables is evaluated. The use of the partial element equivalent circuit method is explained. Measurements on the experimental setup have successfully confirmed the evaluated current.

Nowadays grounding systems and protection devices are designed in order to protect goods and people at the industrial frequency range (50 Hz). In the future, buildings will include more and more smart and power electronics devices. This implies a need to consider a larger frequency range up to some hundreds MHz. Considering the heterogeneity of large systems including grounding, loads, power converters, and cabling, it could be interesting to benefit from the magnetic partial element equivalent circuit approach for which it is not necessary to mesh the media. This paper presents the force of this method, which leads to an electrical equivalent circuit of grounding and cabling systems directly useful in circuit simulator including power converters, loads, etc. The aim of this paper is to detail the modeling process, given this electrical equivalent circuit of grounding systems, taking into account on one hand the physical characteristics of the earth (resistivity and permittivity) and on the other hand the frequency range of disturbances sources. Using this approach, local values such as the current density along conductors, as well as potential everywhere in the studied domain, can be evaluated. Global values such as equivalent impedances can also be determined in order to improve the grounding design.

The reduction of wiring inductance is of great importance in modern power electronic applications, specially for high power, fast switching converters. An important point is the reduction of the inductance due to the connections between source and converter. The busbar technology is the mean that permits the achievement of low inductance in spite of relatively long connections. It consists in the stacking of copper sheets separated by a dielectric. The aim of this paper is to present a modelization of this kind of connection. An equivalent inductive circuit for the busbar is obtained. The validity of the presented simulation method is tested on a chopper structure using busbar technology. Moreover, the current densities in a busbar cross section are available.

Regarding standards, it is well established that common mode currents are the main source of far field emitted by variable frequency drive (VFD)-cable-motor associations. These currents are generated by the combination of floating potentials with stray capacitances between these floating potential tracks and the mechanical parts connected to the earth (the heatsink or cables are usual examples). Nowadays, due to frequency and power increases, the systematic compliance to EMC (ElectroMagnetic Compatibility) becomes increasingly difficult and costly for industrials. As a consequence, there is a well-identified need to investigate practical and low cost solutions to reduce the radiated fields of VFD-cable-motor associations. A well-adapted solution is the shielding of wound components well known as the major source of near magnetic field. However, this solution is not convenient, it is expensive and may not be efficient regarding far field reduction. Optimizing the components placement could be a better and cheaper solution. As a consequence, dedicated tools have to be developed to efficiently investigate not easy comprehendible phenomena and finally to control EMC disturbances using component placement, layout geometry, shielding design if needed. However, none of the modeling methods usually used in industry complies with large frequency range and far field models including magnetic materials, multilayer PCBs, and shielding. The contribution of this paper is to show that alternatives regarding modeling solutions exist and can be used to get in-deep analysis of such complex structures. It is shown in this paper that near field investigations can give information on far field behavior. It is illustrated by an investigation of near field interactions and shielding influence using a FE-PEEC hybrid method. The test case combining a common mode filter with the floating potentials tracks of an inverter is based on an industrial and commercialized VFD. The near field interactions between the common mode inductance and the tracks with floating potentials are revealed. Then, the influence of the common mode inductance shielding is analyzed.

This paper presents an accurate model of series parallel resonant converter with capacitive output filter. Thanks to this analytic study, it is possible to determine rapidly and easily the steady state. Furthermore a design methodology is proposed to choose series and parallel resonant frequencies in order to optimize the behavior of the converter. Simulations are used to demonstrate the accuracy and to check the design methodology.