English Electric Lightning (Crowood Aviation Series) by Martin W. Bowman

By Martin W. Bowman

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A paramount property of CB-PWM is that the ripple current is zero at regular sampling instants, facilitating the use of averaging. For pulse numbers well above 15, CB-PWM results in low current distortions. For low pulse numbers, however, averaging should be avoided and the switching nature of the power electronic system should be addressed by the control and modulation scheme to achieve low current distortions despite the low pulse number. For this, OPPs are the preferred choice. Since sampling instants at which the ripple current is zero in all three phases generally do not exist for OPPs, the concept of averaging is not suitable in the context of OPPs.

Rodríguez, S. Bernet, B. Wu, J. Pontt, and S. Kouro, “Multilevel voltage-source-converter topologies for industrial medium-voltage drives,” IEEE Trans. Ind. , vol. 54, pp. 2930–2945, Dec. 2007. [6] B. P. Schmitt and R. Sommer, “Retrofit of fixed speed induction motors with medium voltage drive converters using NPC three-level inverter high-voltage IGBT based topology,” in Proceedings of the IEEE International Symposium on Industry Electronics (Pusan, Korea), 2001. [7] Y. H. Song and A. T. , Flexible ac transmission systems (FACTS).

Time-varying references y ∗ and additional time-varying parameters can be treated similarly. The explicit control law can be stored in a look-up table, and the optimal manipulated variable can be read from the look-up table in a computationally efficient manner. We refer to this methodology as explicit MPC, in contrast to standard MPC. 16 Model Predictive Control of High Power Converters and Industrial Drives Explicit MPC might appear to be an attractive choice for systems with very short sampling intervals, such as power electronic systems.

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