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One of the major concerns during the design of grid-connected converters is meeting the electromagnetic interference (EMI) standards. Ground leakage current is another aspect which has a stringent limit due to safety concerns. Presence of high frequency pulses, with high dv/dt due to switching actions, in common-mode (CM) voltage excite parasitic capacitances of the power converters. This results...
Due to the voltage low-frequency oscillation (LFO) of high-speed railway traction network and Electric Multiple Units (EMUs) coupling system, many EMUs in different EMU depots appear the traction blockade. First, the mathematical model and small-signal analysis model of EMUs-traction network cascade system (ETNCS) are built. Second, considering Auto-transformer (AT) leakage reactance, traction network...
This paper presents a methodology that can be used to model the electromagnetic behavior of large disk type air-core reactors when excited by fast transient voltages having a frequency content ranging from 10 kHz to 500 kHz. A lumped parameter white-box model is generated using the design details of the reactor. The model parameters are calculated analytically and verified by measurements and finite...
Capacitor is one of the reliability critical components in power electronic systems. In the last two decades, many efforts in the academic research have been devoted to the condition monitoring of capacitors to estimate their health status. Industry applications demand more reliable power electronics products with preventive maintenances. Nevertheless, most of the developed capacitor condition monitoring...
High efficiency and minimum components of the interleaved micro-inverter make them popular in industry. In this paper, a micro-inverter is designed for a 240 W panel in which a high speed MPPT algorithm is implemented in order to keep the reliability of the control system. Moreover, the associated control system is completely described. An optimizing method is applied to the interleaved micro-inverter,...
in this paper is presented a method of modeling the transient phenomena which occur in power transformers winding during lightning impulse voltage test. From the modeling point of view the power transformer winding is without iron core. The equivalent circuit diagram and its parameters (equivalent capacities, self and mutual inductances, conductance and electrical resistances.) are determined using...
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