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The application of Gallium Nitride (GaN) power transistors in a single phase inverter for photovoltaic (PV) systems is presented inverter. The power of the system is 2 kW. For both stages (DC boost stage and inverter stage), a very high switching frequency of 250 kHz is used. By this, a highly compact design for the inverter (200 × 150 × 80 mm3 / 2.4 l) was reached. The power to weight ratio corresponds...
The Current-Source Flyback microinverter is widely used in ac-PV module applications, either in Discontinuous Conduction Mode (DCM), Continuous Conduction Mode (CCM) or Boundary Conduction Mode (BCM). The recently proposed hybrid DCM/BCM operation inherits the merits of both discrete conduction modes and improves the converter performance. In this work a power loss analysis of the hybrid operation...
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...
The transformerless grid-connected PV system suffers from leakage current and neutral voltage imbalance if three-level inverters are utilized. This paper first investigates the common-mode voltage (CM voltage) reduction/elimination methods in three-phase PV inverters, especially three-level inverters. Several mainstream common-mode voltage reduction/elimination methods, including AZSPWM, 2MV1Z, 3MV,...
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...
This paper presents a hybrid PV-battery grid connected system suitable for high power PV power applications. High power PV systems have impressive voltage fluctuation with regards to their maximum power point voltage. Using DC/DC converters to regulate this voltage is inefficient in high power systems as it adds an extra power conversion stage. On the other hand switching frequency, voltage stress...
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...
In this paper, a 50kW multi-string photovoltaic power conditioning system (PV PCS) and control schemes are proposed and analyzed. The PV PCS consists of five 10kW three-phase interleaved dc-dc converters and a 50kW centralized inverter with LCL-filter, whose controllers are connected through CAN communication for synchronization and ripple current reduction. Prototype of multi-string PV PCS is implemented...
This paper analyses the influence of the modulation technique on the size of the grid EMI filter inductor in a full bridge converter for photovoltaic systems. Additionally, the use of an alternative modulation technique is proposed which exhibits the best compromise concerning efficiency, current quality and EMI filter size.
Based on conventional current hysteresis band control, an adaptive hysteresis band control algorithm featuring dynamically modulate hysteresis band width was presented in this paper, and will be used in the application of photovoltaic grid-connected inverter. In the platform environment of Matlab/Simulink, the simulation modules of photovoltaic array, hysteresis band calculator, adaptive hysteresis...
Power converters for renewable energy systems are expected to have a high lifetime, low costs and a very high efficiency over a wide input power and voltage range (e.g. for photovoltaic and fuel cells). Although very high efficiencies can be achieved with hard-switched power converters operating with state of the art semiconductors, hard-switching results in several disadvantages such as conducted...
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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