Abstract
In this work, a proposal is presented to mitigate the voltage ripple effect generated by switched reluctance generator (SRG) in wind energy conversion systems (WECS). Voltage and current oscillations of switched reluctance generators are an expected consequence of the machine’s natural switching operation. This switching operation creates a known frequency component, named stroke frequency. When the SRG is connected to the AC utility grid in WECS, these oscillations may compromise the generated power quality by introducing stroke frequency components in the grid electric current. To solve such issue, this work has as an original contribution the proposal of in-loop adaptive filters applied to mitigate the propagation of the SRG stroke frequency content in the DC-bus voltage of a grid-connected WECS. The notch cascading and moving average filters are implemented at the voltage loop of the voltage source converter in an adaptive form, as function of the SRG speed. Simulation and experimental results show that the waveform distortion of the injected electric current is greatly reduced compared to the conventional non-filtered SRG connection.
Highlights
T HE switched reluctance generators (SRG) have drawn attention for robustness as no winding or magnets is present on the rotor, besides the machine’s low cost and high efficiency
This paper proposes in-loop filtering methods to improve the power quality of the grid-connected SRG
The experimental results show that the proposed strategies reduce the waveform distortion of the injected current, improving the power quality of the SRG-based wind system when compared to a non-filtered solution
Summary
T HE switched reluctance generators (SRG) have drawn attention for robustness as no winding or magnets is present on the rotor, besides the machine’s low cost and high efficiency. In [7], [8], simulations of a speed-control system were performed using an adaptive neural network This strategy acts over the current control of an SRG connected to the electrical grid using a voltage source converter (VSC). The active power reference is affected by the SRG output voltage oscillations, resulting in current waveform distortion on the electrical grid This is a detrimental effect, since the achievable performance may decrease below an acceptable level, regarding the harmonic content in the grid [12]. For this reason, this paper proposes in-loop filtering methods to improve the power quality of the grid-connected SRG. The experimental results show that the proposed strategies reduce the waveform distortion of the injected current, improving the power quality of the SRG-based wind system when compared to a non-filtered solution
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