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This work analyzes the stability of a cascaded converter system comprised of two dc-dc converters operating with voltage-mode controllers. First it develops a single converter small-signal model and derives the mathematical representation of the converter from it. Next, it derives the required closed-loop transfer functions and input and output impedances from the model. Then, it develops the cascaded...
This paper presents a discrete-time adaptive current controller for grid-connected voltage source PWM converters with LCL-filter. The main attribute of the proposed current controller is that, in steady state, the damping of the LCL resonance does not depend on the grid characteristic since the adaptive feedback gains ensure a predefined behavior for the closed-loop current control. Simulation and...
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