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Performance of a binary asymmetrical cascaded H-bridge (CHB) inverter using two H-bridges is investigated in this paper. A modified hybrid modulation technique is implemented where one bridge operates at fundamental switching frequency and handles most of the power. The 2nd bridge operates at a higher switching frequency to generate a desired sinusoidal waveform at the output. Thus, the H-bridges...
A dual inverter based solar PV system is presented in this paper. To reduce the switching loss, the main inverter is switched at low frequency (square wave mode) while the other inverter operates at a higher frequency to compensate for the harmonics generated by the low frequency inverter. A new maximum power point tracking (MPPT) algorithm is proposed using only AC-side current and voltage signals...
Asymmetrical cascaded multilevel converters can generate more number of voltage levels for the same number of switching devices. Binary, Trinary and other different forms are available in literature. This paper has critically investigated such converters from the point of view of optimizing the number of levels. A mathematical tool to analyze the possibility of any asymmetric ratio for various three-phase...
This paper proposes a combination of low- and high-frequency hybrid active power filter (APF) to operate in parallel for better performance. The individual hybrid APF is a series combination of L-C filter with the corresponding voltage source inverter. The dc links of both the inverters are connected in parallel, and the voltage of the dc link is maintained by the low-frequency inverter (LFI). The...
This paper deals with a unique combination of two inverters those may work as an active power filter (APF) or a STATCOM. Two inverters are switched at different frequencies. The low frequency inverter takes care of the reactive power demand of the system and makes the source current in phase with the voltage, while, the high frequency inverter mostly compensates for the harmonics. In the limiting...
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