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The basic concept of a multilevel converter is to synthesize a staircase voltage wave-form by the use of several lower voltage DC sources. Capacitors, batteries, fuel cells and photovoltaic modules can be used as DC sources. A multilevel converter has several advantages, like a high voltage quality and low electromagnetic compatibility problems. Two different modulation schemes for multilevel inverters...
This paper presents a stochastic Newton method to compute the switching angles in multilevel converters so as to produce the required fundamental voltage while at the same time not generate higher order harmonics. For Newton method, a good initial guess which should be very close to exact solution patterns is necessary, so using stochastic techniques gives a new way to find possible initial values,...
This paper describes a grid-connected photovoltaic (PV) system with the function of active power filter (APF), in which a Z-source network is employed to boost the DC bus voltage during periods when the PV array output is low. After modeling the Z-source network and H-bridge converter, a state space model of Z-source inverter is derived. The model reflects the fact that the Z-source inverter has two...
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