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Parametrization of Piezoelectric Vibration Energy Harvesters for Low Power Embedded Systems

Year: 2016 Volume: 10 Issue: 6 798 - 805 Pages

• Authors:
• Yannick Verbelen
• Tim Dekegel
• Ann Peeters
• Klara Stinders
• Niek Blondeel
• Sam De Winne
• An Braeken
• Abdellah Touhafi

Abstract: Matching an embedded electronic application with a cantilever vibration energy harvester remains a difficult endeavour due to the large number of factors influencing the output power. In the presented work, complementary balanced energy harvester parametrization is used as a methodology for simplification of harvester integration in electronic applications. This is achieved by a dual approach consisting of an adaptation of the general parametrization methodology in conjunction with a straight forward harvester benchmarking strategy. For this purpose, the design and implementation of a suitable user friendly cantilever energy harvester benchmarking platform is discussed. Its effectiveness is demonstrated by applying the methodology to a commercially available Mide V21BL vibration energy harvester, with excitation amplitude and frequency as variables.

• Keywords:
• Energy harvesting
• vibrations
• piezoelectric transducers
• embedded systems
• harvester parametrization.

Study of Two MPPTs for Photovoltaic Systems Using Controllers Based in Fuzzy Logic and Sliding Mode

Year: 2015 Volume: 9 Issue: 5 1269 - 1274 Pages

• Authors:
• N. Ouldcherchali
• M. S. Boucherit
• L. Barazane
• A. Morsli

Abstract: In this study, we proposed two techniques to track the maximum power point (MPPT) of a photovoltaic system. The first is an intelligent control technique, and the second is robust used for variable structure system. In fact the characteristics I-V and P–V of the photovoltaic generator depends on the solar irradiance and temperature. These climate changes cause the fluctuation of maximum power point; a maximum power point tracking technique (MPPT) is required to maximize the output power. For this we have adopted a control by fuzzy logic (FLC) famous for its stability and robustness. And a Siding Mode Control (SMC) widely used for variable structure system. The system comprises a photovoltaic panel (PV), a DC-DC converter, which is considered as an adaptation stage between the PV and the load. The modelling and simulation of the system is developed using MATLAB/Simulink. SMC technique provides a good tracking speed in fast changing irradiation and when the irradiation changes slowly or it is constant the panel power of FLC technique presents a much smoother signal with less fluctuations.

• Keywords:
• Fuzzy logic controller
• maximum power point
• photovoltaic system
• tracker
• sliding mode controller.

A Study of Wind Speed Characteristic in PI Controller based DFIG Wind Turbine

Year: 2011 Volume: 5 Issue: 12 1850 - 1855 Pages

• Authors:
• T. Unchim
• A. Oonsivilai

Abstract: The Wind Turbine Modeling in Wind Energy Conversion System (WECS) using Doubly-Fed Induction Generator (DFIG) PI Controller based design is presented. To study about the variable wind speed. The PI controller performs responding to the dynamic performance. The objective is to study the characteristic of wind turbine and finding the optimum wind speed suitable for wind turbine performance. This system will allow the specification setting (2.5MW). The output active power also corresponding same the input is given. And the reactive power produced by the wind turbine is regulated at 0 Mvar. Variable wind speed is optimum for drive train performance at 12.5 m/s (at maximum power coefficient point) from the simulation of DFIG by Simulink is described.

• Keywords:
• DFIG
• wind speed
• PI controller
• the output power.