AUTHORS: Victor Guerrero, Jorge Pontt, Marcelo Vasquez, Manuel Olivares

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ABSTRACT: Predictive current control methods for forced-commutated converters, e.g., voltage source inverter, are well documentated and they perform very well compared with the classical solutions, i.e., hysteresis control and proportional-integral controllers with pulsewidth modulation. This paper presents a strategy to implement a predictive control technique for a naturally-commutated converter, e.g., multipulse cycloconverter. This strategy uses a discrete-time model of the system to predict the future value of the load current for all possible output voltages of the converter. Since in a naturally-commutated converter the possible output voltages are dynamic and they depend on the present switching state of every semiconductor of the converter, these output voltages must be obtained from a mathematical model (finite-state machine) of the converter. The proposed current control strategy is tested. The simulation and experimental results show that a predictive control strategy can be used not only in applications with forced-commutated converters but also with naturally-commutated converters showing good electric performance.

KEYWORDS: Predictive Control, Cycloconverter, naturally-commutated converters, Thyristors

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