A new controller to track the maximum power point (MPP) of a variable speed wind energy conversion system (WECS) incorporating permanent magnet synchronous generator (PMSG) along with DC link reduction is presented in this paper. The power extracted from the turbine is affected by the double line frequency voltage ripple present in the DC link of the system. The traditional large electrolytic capacitors used for the DC link are bulky and less reliable, thereby reducing the reliability of the system. The replacement of these capacitors with lower capacity film capacitors which are costlier and more reliable proves to be a viable solution for this problem. So, an algorithm to track the MPP along with the DC link reduction is proposed. The proposed method is implemented, analyzed and verified in MATLAB/SimPowerSystem. The simulation results obtained clearly shows the effectiveness of the proposed control strategy for WECS based on the PMSG.Index Terms-MPPT, PMSG, ac-dc-ac power converters, WECS, DC link ripple reduction, double line frequency ripple correction.
Her current research interests are in the area of power electronics which includes advanced converters for power supplies, power quality issues, active power filter development, utility interface issues, power conditioning systems for fuel cells, wind and solar energy systems. She holds one US patent with industry collaboration. She is an IEEE Senior member and is actively involved in funded research projects while engaged in teaching, research and consulting in the area of power electronics, motor drives, power quality and clean power utility interface issues.
This paper presents a novel robust maximum power point tracking (MPPT) control for a grid connected photovoltaic (PV) system with reduced DC link capacitance. The voltage source inverter (VSI) integrating the PV system to the grid introduces a double line frequency ripple or current variation into the PV system. This ripple or current variation results in oscillation of operating point around the MPP, introducing an extra power loss from the extracted panel power. In order to reduce this ripple content, large electrolytic capacitors are used as power decoupling units in grid connected PV systems. However, these electrolytic capacitors are bulky and less reliable affecting the reliability of the entire PV system. These electrolytic capacitors can be replaced by highly reliable thin film capacitors, if the energy storage requirement could be reduced. So, a novel DC-DC converter control is proposed to reduce the PV ripple variation along with MPPT control under reduced DC link capacitance. The method proposed is implemented and verified in MATLAB/Simulink software under varying sun conditions. The results obtained from the proposed control clearly show the increase in power extracted from the PV system under reduced DC link capacitance making the system more reliable and economical.
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