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An evaluation is performed for three-phase solar Photo-Voltaic (PV) inverters using either Silicon (Si) or Silicon Carbide (SiC) power devices. Standard and emerging topologies for high-efficiency (>98%) PV inverters are identified and optimized for the capital cost of power filter components and power devices. Analytical formulae are developed for minimum filter inductance considering both current...
The Current-Source Flyback micro-inverter is widely used in ac-PV module applications, operated either on Discontinuous Conduction Mode (DCM) or Boundary Conduction Mode (BCM). However, each mode has its performance disadvantages (either low power density for DCM or low efficiency due to increased switching losses for BCM). To overcome the above, a hybrid DBCM operation is proposed hereafter, taking...
This paper describes the application of the distributed maximum power point tracker (DMPPT) to increase the energy yield of the photovoltaic (PV) system during partial shadings. It compares the performance of PV modules fitted with the SPV 1020 DMPPT chip to the one without it. Experimental work is carried out using eight polycrystalline modules, mounted on a two-axis rotating tracker. The partial...
This paper compares the advantages and disadvantages of I-type 5-level inverter and T-type 5-level inverter, involving the conduction loss, commutation path in reactive power and switching loss, especially at high frequency. Based on the analysis, this paper proposes a novel 5-level inverter for solar system, aiming at reducing both the conduction loss and switching loss at high frequency, and solving...
For solar central inverters, high efficiency is still a very important issue. It increases the yield, but even more important, it reduces the thermal stress of all components, minimizes the cooling effort or allows higher ambient temperatures. The main challenge is not only to reach high peak efficiency in one operation point but more to provide a good performance over the whole voltage and power...
To increase efficiency is an essential target in photovoltaic (PV) power generation system. The losses of the whole system consist of several parts. This paper focuses on the losses of the hard-switching devices. An improved method to calculate the device losses is proposed. And influences of different factors like DC link voltage, input power, switching frequency and power factor on the losses are...
The grid-connected photovoltaic (PV) systems are an important part of renewable energy sources and their integration is getting more and more widespread. In order to improve the efficiency, practicality and reliability of the PV systems, many kinds of new inverter topologies have been proposed to avoid using a grid isolation transformer. The NPC topology and two other derived topologies are presented...
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