Parameter and state estimation in power electronic circuits

Techniques for reconstructing or estimating unmeasured circuit variables and parameters in power electronic circuits are investigated. In numerous applications in power electronic systems, measurements of circuit variables (currents and voltages) are required for closed-loop control purposes or for diagnostic purposes, but are expensive or impossible to obtain directly. Examples are certain inductor currents, voltage at high-impedance nodes where probes cannot be applied or circuit variables in electrically isolated portions of a circuit. The approach taken is based on observer theory, and so the resulting algorithms may be implemented in real time. A natural scheme for implementing an observer is given