Abstract
The requirement of high voltage-power level for many applications like the energy conversion system give rise to use a structure of a multilevel converter like the multicell series converter. To benefit as much as possible from this power converter an appropriate voltage distribution for each cell must be performed, hence the need to estimate this voltages. This paper aims to design a minimal single linear functional observer for a multicell series converter to estimate the capacitor voltages. Based on its hybrid model, an observability study prove the ability to estimate this capacitor voltages. Also a linear functional observers are proposed using a direct procedure without solving the Sylvester equation and based on an operation mode classification approach. Simulations of four-cells multicell converter are given in order to check the efficiency of the converter’s hybrid model and the performance of the proposed minimal single linear functional observers.
Highlights
Due to the energy transition combined with e-mobility, energy conversion systems require higher power level
The purpose of our study is to develop a minimal order linear functional observers for the Multicell Series Converter (MSC)’s hybrid model in order to estimate each capacitor voltage
Note that a rigorous proof of this results for a dynamic system is established in [10]. According to this result it is possible to deduce the previous expression of an hybrid functional observer applied for each operation mode of the MSC
Summary
Due to the energy transition combined with e-mobility, energy conversion systems require higher power level. High blocking voltage switches have a lower dynamic performance To mitigate both power level associated with higher blocking voltage, and good switching dynamics, Multicell Series Converter (MSC) are an alternative to usual conversion structures. In such a structure, the output leg voltage is produced by a specific association of switching cells. It is noticed that the study of the functional observer for a multilevel converter (even for a continue switch system) has not been reported despite its utility for such system which present an observability problem caused by a switch behaviour Before the conclusion an application to a four-cells converter is provided including simulation results
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