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Small-signal stability in balanced three-phase systems can be analyzed using Generalized Nyquist stability Criterion (GNC), which is based on source and load impedances in synchronous rotating (d-q) frame. The derivation of d-q input impedance of controlled power electronics converters is relatively easy in the case that current controller is implemented in d-q reference frame, while the analysis...
In this paper, a novel burst mode control solution for LLC resonant converters is proposed for the highest efficiency and small output voltage ripple. The burst time is set to be constant, the off time is modulated by load conditions. During the burst time, three pulse switching pattern is implemented to keep output voltage low frequency ripple minimal. The switch first turned on is controlled to...
Smart micro-grids offer a new and wide application domain for power electronics. In fact, every distributed energy resource (DER) includes an electronic power processor (EPP) to control the power exchange with the grid. If such distributed EPPs perform cooperatively, they have the capability to fully exploit all renewable power sources and energy storage units while improving the power quality and...
A digital implementation of synchronous rectification (SR) driving scheme for LLC resonant converter is proposed in this paper. Compared with analog ones, digital implementation enables more intelligent and precise SR control, improving converter efficiency. In the proposed SR driving scheme, the drain to source voltage of synchronous rectifier on the secondary side is sensed, so that the paralleled...
This paper discusses the implementation of an equivalent resistive-reactive load for the optimum energy harvesting from vibration sources. In photovoltaic applications, the converter impedance that ensures the maximum power is real and the Maximum Power Point Tracker (MPPT) uses a single variable optimization algorithm (resistive load matching). The piezoelectric generator, instead, is characterized...
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