Modeling of multiport DC busses in power-electronic systems

Abstract

Abstract-This paper deals with dynamic modeling of multiport DC busses, which are increasingly applied in various DCpower distribution systems, such as hybrid powertrains and DC microgrids. Parasitic impedances of long DC cabling together with distributed DC capacitors introduce a potential risk of smallsignal instabilities in the DC bus, if resonance frequencies of the bus appear below (or around) switching frequencies of powerelectronic converters. In order to predict the resonance behavior of the bus, a systematic approach for dynamic modeling of the DC bus in power-electronic systems is presented. The DC-bus model is validated by means of experiments. Furthermore, application of the model in small-signal analysis and time-domain simulations is illustrated.

Impact of the switching frequency on the DC-side admittance in three-phase converter systems

“…The impact of the time delay on the DC-side admittance has been neglected in most cases [1,5]. In [2,6,7], the time delay has been modelled, but the effect of different switching frequencies on the DC-side admittance was not considered. The value of the switching frequency is important, because it determines the switching losses of the converter.…”

Reconfigurable Power Converter for Constant Current Underwater Observatory

“…Wang, Saha, and Zane [25] analyze the stability of an SRC with CC output being regulated in considering the cable effect, but only discuss the influence of small current fluctuation on the steady-state, whereas heavy load changes are not considered. Due to the presence of parasitic parameters such as the capacitance Electronics 2020, 9,307 3 of 18 and inductance on long cables [25][26][27], the dynamic response of a long-cable CC system is relatively slow and the mentioned CC/CV methods may face challenges such as voltage oscillation or instability especially when heavy load change occurs [19]. The relatively low stability leads to relatively low reliability.…”

“…Electronics 2020, 9,307 3 of 18 load changes are not considered. Due to the presence of parasitic parameters such as the capacitance and inductance on long cables [25][26][27], the dynamic response of a long-cable CC system is relatively slow and the mentioned CC/CV methods may face challenges such as voltage oscillation or instability especially when heavy load change occurs [19]. The relatively low stability leads to relatively low reliability.…”

High‐frequency modelling of a three‐phase pulse width modulation inverter towards the dc bus considering line and controller harmonics

“…There have been some reports regarding topics dealing with the harmonic analysis of an inverter towards the dc bus [8–16]. For instance, in [8] a general impedance approach is utilised to find out the form of the spectrum.…”