LAUSR

This paper proposes and discusses the integral control of megawatts power electronics (MPE) systems. Firstly, we propose that MPE systems share the common features defined as generalized hybrid systems (GHSs), where large-time-scale continuous dynamic embodies the discrete process while the discrete process embodies the small-time-scale continuous switching transient. Then, we propose that such a GHS calls for an integral control of the “continuous-discrete-continuous” process which considers the multiple timescales simultaneously. The necessity of an integral and simultaneous control in MPE over a separate control or hardware integrity is discussed. Then, the state-of-the-art control methods for the large-time-scale “continuous-discrete” dynamics and the small-time-scale “discrete-continuous” transients are reviewed within the context of GHSs respectively. Based on the investigations, in-depth discussions are provided on why and how to combine the above separate methods to simultaneously control the multiple timescales and form an integral control. The need of the integral control is summarized. Two examples of 1) a switching loss reduction and 2) an EMI performance improvement in MPE systems are provided to demonstrate why and how to consider and control the multi-time-scale behaviors tightly and simultaneously. Future trends in the study of integral control for MPE are briefly discussed.