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Vibration energy harvesting is attracting attention as a driving power supply for wireless sensor nodes. Piezoelectric elements are used for piezoelectric energy harvesting (PEH). Because piezoelectric elements provide AC power, a full bridge rectifier is used to obtain DC power. However, a parasitic capacitor of the piezoelectric elements causes a power loss in conventional PEH circuits. Synchronized...
In this study, a new method is proposed for the suppression of voltage amplitude fluctuations on the load terminals. Moreover, the voltage harmonics on the load terminals are effectively reduced below the defined limits in the IEEE-519 standard. In the studied topology, a twelve-switch three-phase voltage source converter is used for effective control on the zero-sequence components due to the unbalanced...
This paper aims to focus on the smooth output of Buck converters under the input perturbations and load disturbances using the high-order sliding mode controller with a differentiator (HOSMD) based on the only measurement of output voltage. Theoretical analysis and design procedures of the controller designed by prescribed control law, one of the high-order sliding modes, are presented in detail....
In this paper a new voltage measurement technique for modular multilevel converter (MMC) capacitors is proposed. While all the capacitors voltages should be known for closed loop control of MMCs, only the arms voltages are measured employing the proposed method. Therefore, the number of voltage sensors reduced dramatically to one per arm. The capacitors voltage quantities are updated continuously...
Efficiency improving methods, while maintaining the unity power factor, represent a major research topic in the PFC rectifiers' area. This paper introduces three novel highly efficient three-phase interleaved buck-type unity power factor rectifiers, namely the interleaved six-switch, the interleaved swiss and the interleaved eight-switch topologies. Compared to the switching strategy of the single-stage...
Multilevel converters are an attractive alternative for medium voltage applications. The Stacked Multicell Converter (SMC), in particular, is a multilevel converter that allows to increase the output voltage level compared with the classical Flying Capacitor Converter, while decreasing the stored energy in the converter. This paper presents the application of Model Predictive Control (MPC) in a three...
This paper proposes a novel integrated light-emitting diodes (LEDs) driver with power-factor correction (PFC), suitable for streetlighting applications. The presented LED driver integrates a buck-boost converter with a flyback converter into a single-stage conversion circuit topology. The inductor inside the buck-boost-type sub-circuit is designed to operate in discontinuous-conduction mode (DCM)...
This paper discusses the implementation of proportional resonant (PR) current controllers for a Voltage Source Converter (VSC) with LCL filter which is synchronized to the grid by virtual flux (VF) estimation with inherent sequence separation. Even though there is an extensive amount of literature and studies on the PR current controller for tracking the current reference of a VSC in the stationary...
In this paper, an enhanced power sharing strategy employing adaptive virtual impedances for Q-ω and P-V droop-based islanded microgrids (MGs) is proposed. The proposed scheme improves the performance of dynamic response and system stability while accurate power sharing is obtained. The low-bandwidth communication is utilized to send the power commands. The adaptive virtual impedances consist of a...
This paper investigates the dynamical behavior of a full bridge DC-AC inverter controlled by fixed frequency pulse-width modulation which is widely used in photovoltaic (PV) generation system. The main results are illustrated with the aid of numerical simulations obtained from an accurate non-linear time varying model of the system derived without making any quasi-static approximation. Based on bifurcation...
This paper presents a solar energy harvesting (EH) system to power a portable compact LED lamp, which can be charged during daytime and used to light during night time. The solar lamp consists of three PV panels, an EH and power management circuit, three NiMH rechargeable batteries, and an LED. A commercial off-the-shelf chip TI BQ25504 is used to prototype the EH and power management circuit for...
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