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In recent years, the use of non-conventional renewable energies, particularly photovoltaic solar energy, has been growing steadily in the country and is currently a real alternative to collaborate in the production of energy required by the national industry. Motivated by the above is that the study and development of technology in Chile for this energy opportunity is fundamental at the present time...
Usage of renewable energy is rapidly growing in last times. Photovoltaic energy has a big potential to supply the households in the near future. Small photovoltaic power systems are being developed in last years. Many issues are connected with this type power system. New inverter topologies are developed to handle effective photovoltaic power system connected to the grid. In the paper, parameters...
Recent studies show that Silicon Carbide and Gallium Nitride based power semiconductors promise better performance over conventional Silicon based devices. In this study, the performance analysis of a three level inverter based on SiC and GaN is discussed for photovoltaic applications. The converter can achieve 99.2% efficiency at 16kHz switching frequency and 1.4kW output power, and operate with...
In this work different three-level topologies suitable for PV systems are analyzed. First the basic operation principles of the Neutral Point Clamped (NPC), Active Neutral Point Clamped (ANPC) and Mixed Voltage Neutral Point Clamped (MNPC) topologies are explained and the used PWM strategies are presented. All three topologies are realized in hardware on a modular test setup, so that it is possible...
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...
In this paper, high efficiency design method for 250[W] photovoltaic AC module is proposed. To find optimized scheme for grid connected application, practical design method of flyback inverter is presented in advance. And power loss of each key device is analyzed. Interleaving method can improve efficiency, because it can reduce current flowing though switches. Therefore, according to increasing phase...
The DC/AC inverters are the key elements of grid-connected PV energy production systems. In this paper, a new technique for the optimal design of the power section and output filter of a full-bridge, grid-connected PV inverter, is proposed. The objective function which is minimized during the Genetic Algorithm-based optimization procedure is the PV inverter Levelized Cost Of the Electricity generated...
A new design methodology that optimizes the weighted efficiency of a single-phase, single-stage flyback inverter for AC-PV module applications is proposed. This novel approach combines the essential advantages of the flyback topology with high efficiency in the direction of a reliable, cost-effective and high performance photovoltaic system. The proposed methodology focuses exclusively on choosing...
Photovoltaic (PV) inverters convert the DC current of solar generators into AC current and feed it into the grid. There are three basic inverter topologies: inverters with low frequency (50/60 Hz) transformer (LF), inverters with high frequency transformer (HF) and transformer-less inverters (TL). The European market is dominated by transformer-less types (80%), in Japan approx. 50% of the inverters...
In this paper the implementation and the performance of 1200 V / 30 A / 65 mOmega normally-off SiC-JFETs in photovoltaic inverters (PV-inverters) is shown and compared with Si-IGBTs. The JFETs' low switching energy and on-resistance lead to an improvement of efficiency and a reduction of costs and weight of PV-inverters.
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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