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Abstract: Developments in small R&D KAITM systems have resulted in NREL-confirmed stabilised cell efficiencies of 10.09% for amorphous p-i-n and 11.91% for Micromorph tandem devices. Up-scaling of the processes to 1.4 m2 R&D equipment has so far lead to modules having initial powers of 139.1W for amorphous silicon and 163W for Micromorph tandem respectively. At present Oerlikon customers produced in total more than 4.5 million modules (a-Si:H p-i-n or Micromorph tandem) which all together correspond to a cumulative total power of over 450 MWp. Recently Oerlikon Solar introduced its new improved production concept, the so-called ThinFabTM, which brings module production costs down to remarkable 0.5 €/Wp at a capacity of 120 MWp. [Copyright &y& Elsevier] more...

We introduce an event-triggered algorithm for the stabilization of switched linear systems. We define a pseudo-Lyapunov function common to all the subsystems. The pseudo-Lyapunov function is compared, at every time instant, to an exponentially decreasing upper threshold. An event is generated when the two functions intersect, or when a new subsystem becomes active. The existence of a Lyapunov function common to all the subsystems is a key requirement of this method. Nevertheless, imposing this condition does not add to the complexity of the problem. Indeed, we formulate the problem in terms of Linear Matrix Inequalities, as a generalized eigenvalue problem. This formulation allows to simultaneously check for the existence of a common Lyapunov function and to obtain the optimal parameters to define the upper threshold. We prove the stability of the system under the event-triggered control and we show that successive events are separated by a minimum interval of time. • Application of event-triggered control to switched linear systems. • Simple method that requires few design parameters. • An optimization method is proposed to tune the parameters. [ABSTRACT FROM AUTHOR] more...