The influence of the properties of magnetic materials on a voltage source inverter control

Drawbacks of impedance networks

“…Notably, R LZ is the real resistance of the inductor in the impedance network and is much higher than the serial resistance R LZDC for the DC current because of the power losses in the inductor core . The coil cores in the laboratory model are made of Super‐MSS alloy powder .…”

“…However, none of these papers use the state space averaging method to create an equivalent model of the output impedance. The output impedances of the impedance networks implement 2 additional resonant frequencies to the control transient function that are very close to each other and to the fundamental frequency; thus, the damping resistances in the output impedance model determine the final change in the transient function …”

“…The coil equivalent resistance depends on the type of the core magnetic material used and its properties because this resistance depends on the power losses in the core. The serial resistance greatly increases with the magnetizing current amplitude and frequency (the power losses caused by the switching operation with f c dominate the other power losses) . The values of the coil inductances change with the frequency and amplitude of the magnetizing current.…”

“…The calculation of the power efficiency for the Z-source DC/DC converter (without the inverter) was presented in Siwakoti et al 18 Notably, R LZ is the real resistance of the inductor in the impedance network and is much higher than the serial resistance R LZDC for the DC current because of the power losses in the inductor core. [21][22][23][24] The coil cores in the laboratory model are made of Super-MSS alloy powder. 25,26 This resistance should be measured for the assigned current and the switching frequency.…”

“…The switched inductor Z-source inverter (SLZSI) (Zhu et al 4,5 ) is an impedance network structure with a higher increase in the DC voltage than the qZSI. There are other mixed and developed impedance network structures: embedded SLZSI, 6 inductor-capacitor-capacitor-transformer Z-source, 7,8 and cascaded quasi-Z-source (CqZSI). 9 A new high-boost-factor, 2-winding magnetically coupled impedance source impedance network with a continuous input current is presented in Siwakoti et al 10 Another novel impedance network circuit based on 3 coupled inductors with a Δ connection is presented in Hakemi et al 11 However, both of these networks are presented as DC/DC converters.…”