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1

Real-time implementation of an interconnected observer design for p-cells chopper

Laidi K., Benmansour K., Ferdjouni A., Bouchhida O.

Archives of Electrical Engineering

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2010

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Vol. 59, nr 1-2

5-20

EN

This paper deals with an observer design for a p-cell chopper. The goal is to reduce drastically the number of sensors in such system by using an observer in order to estimate all the capacitor voltages. Furthermore, considering an instantaneous model of a p-cell chopper, an interconnected observer is designed in order to estimate the capacitor voltages. This is realized by using only the load current measurement. Simulation results are given in order to illustrate the performance of such observer. To demonstrate the validity of our approach, experimental results based on Digital Signal Processor (DSP) are presented.

2

On hybrid observability and sliding mode observer in three cells converter

Mezhoud A., Maradi S., Benmansour K., Djemai M., Tadjine M.

Archives of Control Sciences

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2009

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Vol. 19, no. 2

179-204

EN

Power converters by their nature present hybrid behavior since they contains switched circuits. Such circuits can be described by a set of discrete states with associated continuous dynamics. In this paper a new hybrid model for a 3-cells power converter is proposed. This hybrid model incorporates both the continuous and discrete states allowing better understanding of the system operating modes and properties. Of particular interests the new concept of hybrid Z(TN) observability is used to deal with the observability of the capacitors voltages and a discussion on the achievable observation dynamics is given. A sliding mode observer strategy is derived to estimate the flying voltages of the converter. Furthermore, it is derived that under some specific control sequence, the observation errors are asymptotically stable. Finally, experimental results are presented in order to illustrate the performance of the proposed approach.

3

On robust state feedback control of a permanent magnet synchronous machine drive: an experimental evaluation

Benmansour K., Boucherit M. S., Tadjine M., Rezine H.

Archives of Control Sciences

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2005

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Vol. 15, no. 1

83-96

EN

This paper presents a theory and an experimental evaluation of robust control algorithm for permanent magnet synchronous machine (PMSM) speed drive fed by voltage source inverter. A simple control model is first obtained by performing field orintation through a nominal linearizing stste feedback. Then, the robust control algorithm based on pole placement is applied to the PMSM in order to deal with plant uncertainties. The adopted method uses the notion of geometric stability and the multi-model approach in order to synthesis the state regulation by robust pole placement. To show the validity of our control approach. DSP based experimental results are presented. These results are very satisfactory and prove the feasibility of our control algorithm.