Observer design for DC/DC power converters with bilinear averaged model

Increased demand for high bandwidth and high efficiency made full state-feedback control solutions very attractive to power-electronics community. However, full state measurement is economically prohibitive for a large range of applications. Moreover, state measurements in switching power converters are very noisy. These facts make the development of observer design targeted specifically to power electronics highly important. This paper analyses suitability of two previously proposed hybrid observer design techniques for continuous-time linear switched and discrete-time piecewise affine systems in context of power converters. Furthermore, a novel design procedure of Luenberger type observers is proposed for discrete-time systems with input-induced bilinearity. The performance of developed observers is demonstrated through simulation and experimental results obtained for a buck-boost converter.