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We present a study of work limits for two dc-dc converters associated in series. This type of structure is usually used to maximize the electrical energy production of a photovoltaic system when it is subjected to shading. We expose our study to research these limitations in the case of expensive shading.
This paper presents an implementation of a new fast, robust and accurate Maximum Power Point Tracking (MPPT) technique for Photovoltaic (PV) applications. This algorithm uses an adaptive perturbation generator coupled with a synchronous data acquisition process. A variable offset is added to the perturbation in order to provide the control signal for the Digital Pulse Width Modulation (DPWM) stage...
This paper presents an Adaptive Multi-Phase Converter (AMPC) used as a perfect matching stage to improve the global energy production and conversion efficiency of a photovoltaic power conversion system. A control law was specially developed to guarantee high conversion efficiency, even in presence of a constantly changing operating point, which is the main constraint in a traditional photovoltaic...
This paper proposes the use of a predictive controller to regulate a dc/dc converter interacting with a photovoltaic generator and a grid-connected inverter. The proposed solution rejects perturbations generated by environmental conditions and inverter transients. In addition, the predictive controller is able to recover from inverter wrong operation, i.e. drive dc-link voltage under the photovoltaic...
In this paper, a control method for autonomous changing the number of parallel driven DC-DC converter is proposed. In order to improve efficiency of the parallel driving, the number of parallel driven converters is dynamically changed for the variations of output power. Taking into account the implementation requirements, the chosen platform was an Field-Programmable Gate Array (FPGA). This paper...
The cascade connection of a low-ripple voltage doubler pre-regulator and a classical boost converter regulator is proposed to improve the efficiency of the full system due to the reduction in average currents of all boost converters and the smaller duty cycle required for the conventional boost regulator. The pre-regulator inherent low input current ripple, which operates at a 50% duty cycle in complementary...
This paper analyzed the efficiency of typical fuel cell hybrid topologies to propose a selection criteria depending on the load power profile. Also, it is presented a constraints-based robust control design to regulate the fuel cell system in safe operating conditions. This controller prevents the oxygen starvation phenomena by regulating the oxygen excess ratio. Finally, simulation results show the...
In grid-connected Photovoltaic (PV) applications, DC-links based on large electrolytic capacitors are used to attenuate voltage oscillations caused by the sinusoidal power injection into the grid, where the electrolytic capacitors introduce reliability problems. This paper proposes the unified modeling of the complete PV system in typical grid-connected operation conditions to design control strategies...
An efficient pre-filter based on interleaved DC-DC boost switching converters to mitigate high-frequency harmonics injection to power sources is proposed. The main feature of the pre-filter is to mitigate the ripple of power converters input-current, improving the efficiency of the whole power conversion chain. The pre-filter optimal operating conditions are calculated, and the circuit is modeled...
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