This paper presents a predictive one-step current control scheme for d.c.-d.c. converters with a generic RLE load. In avoidance of the parameter sensitivity of the controller, a permanent identification of the controlled system will be used, so that there is also no need of knowledge of the control parameters like the inductance, resistance and d.c.-link voltage. Only current measurement is necessary. The identification needs no additional test pulses, instead it uses the current response caused by the alternation of the switching states of the d.c.-d.c. converter with a standard pulse-width modulation (PWM). It will be shown that this control is suitable for four-quadrant operation. Furthermore it needs no superposed control circuit for the regulation of the mean value of the current.
In Z-Source Inverters (ZSI), the modulation strategy determines the size of the inductors and capacitors as well as the system losses. In this paper the impact of the modulation method on the design of the passive components is examined in detail with an Interior Permanent Magnet Synchronous Machine as load. Specific features of several modulation methods are presented for steady state operation and guidelines for the design procedure are developed. It will be shown, that a large number of ShootThrough states does not necessarily lead to small ripples in the passive components. From these considerations, a method for minimizing the required inductance and ZSI losses is established. Simulations and experimental results, including the measurement of the system losses support the analysis.
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