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This paper models and proposes a controller for a modified quadratic buck converter where the input inductance has been replaced by an LC filter. The voltage conversion ratio of this converter is equivalent to two conventional buck converters in cascade and has only one active switching device. Due to the LC input filter, the high-frequency switching components are reduced at the input and this may...
This paper studies a modified DC-DC boost converter where the input inductance has been replaced by an LCL filter. The voltage conversion ratio of the proposed converter is equivalent to the conversion ratio of a conventional boost converter, and it has only one active switching device. A controller is proposed to regulate the output voltage to a given reference with guaranteed reduced input current...
In this paper, a simple single-phase grid-connected photovoltaic (PV) inverter topology consisting of a three-level inverter, an LCL filter, and a new current feedback method for active damping is considered. A dynamically rapid method is used for tracking the maximum power point (MPP) of photovoltaic arrays, known as ripple correlation control. The algorithm uses the current and voltage low-frequency...
The Interconnection and Damping Assignment Passivity-Based Control (IDAPBC) is applied phase-independently to the Modular Multilevel Converter (MMC) in order to overcome “dqo”-based control problems. In addition, an equilibrium point estimator is proposed to determine the time-varying equilibrium state of the MMC needed as input for the non-linear controller. This control strategy provides global...
The analytical tool is based on linearization about the steady-state solution of the nonlinear first order differential equations modeling the MMC. The resultant linear dynamic equation of the perturbation state variables is time periodic. The state-transition matrix is computed by numerical integration and its eigenvalues are applied to determine small signal stability and the sensitivity of the...
The injected grid current regulator and active damping of the LCL filter are essential to the control of LCL-type grid-connected inverters. Generally speaking, the current regulator guarantees the quality of the injected grid current, and the active damping reduces the resonance peak caused by the LCL filter and makes it easier to stabilize the whole system. However, the frequency responses of the...
The LCL filter is widely used in grid-connected inverter due to its powerful ability of attenuating the switching-frequency harmonics. However, the frequency response of the LCL filter has a resonance peak, which would amplify the harmonics around the resonant frequency or even cause the inverter to be unstable. Active damping based on the feedback of capacitor current is an effective solution to...
This paper focuses on comparing the effects of varying degrees of electromechanical coupling in piezoelectric power harvesting systems on the dynamics of charging a storage capacitor. In order to gain an understanding of the behavior of these dynamics, a transducer whose vibrational dynamics are impacted very little by electrical energy extraction is compared to a transducer that displays strong electromechanical...
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