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Silicon carbide (SiC) trench MOSFET half-bridge and full-bridge power modules with hybrid integrated gate drivers on aluminium nitride (AlN) substrate were designed with electro-thermal co-simulation and soldered on an aluminium heatsink, achieving 0.3 K/W junction-to-heatsink thermal resistance. A 2 kW single-stage PV-inverter with active energy-buffer was built around the modules, achieving a weighted...
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...
This paper presents new findings on phenomena contributing to flicker and voltage variations caused by grid-connected photovoltaic (PV) inverters. The voltage variations caused by two different 6 kW single-phase grid-connected PV inverters were studied during climatic variations by varying their grid-coupling impedance. Two different methods for characterizing the PV-plant induced voltage variations...
This paper proposes a novel control topology which enables the setup of a low cost analogue system leading to the implementation of a modular energy conversion system. The proposed system will be presented from concept, through the design and implementation stages, and verified through simulation and experimental results.
The power fed to the grid by a single-phase photovoltaic (PV) inverter fluctuates at twice the grid frequency. This fluctuation causes double-line-frequency ripple component to the DC-link voltage in two-stage PV inverter. If the DC/DC converter is not able to attenuate this ripple, also the PV generator voltage will fluctuate decreasing the maximum power point tracking (MPPT) efficiency. The ripple...
This paper proposed an improved topology for a high efficiency PWM DC-AC grid-connected PV inverter that utilizes a zero-voltage-transition (ZVT) auxiliary network to provide soft-switching condition. In this paper, a soft-switching method using ZVT technique is presented to increase the efficiency of the single-phase grid-connected photovoltaic (PV) power generation system. ZVT technique employs...
Energy generation via Photovoltaic (PV) technologies has increased in the last years. Large scale PV generation have attracted interest among countries due to low operation cost and wide PV resource disposition. However, some operative challenges in large scale PV plants had been detected: power imbalance, low power quality in terms of total harmonic distortion (THD), power factor and conversion efficiency,...
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...
This paper presents a control strategy for a single-phase photovoltaic inverter, using a parallel active buffer circuit. The aim is to reduce the volume demand of the necessary capacitance for filtering the twice line frequency pulsating power. The pulsating power is stored in an additional buffer capacitor, which is decoupled from the input voltage by an active buffer circuit. Therefore a high voltage...
This paper presents two-stage power conditioning system for grid integrated Photovoltaic (PV) applications. The proposed system has distinct feature such as: high voltage gain, high efficiency, low voltage stress and galvanic isolation. The system is controlled via Model Predictive Control (MPC) to do the following functions: extract maximum power from the PV generator, and inject a sinusoidal current...
As energy demand is increasing rapidly, our deployment must be tending towards Renewable Energy Sources (RES), in order to meet the demand. Photovoltaic (PV) is one of the most focused RES due to plenty than other sources. Before serving to the load, the generated power by solar array is treated electronically and this process is called 'power conditioning'. In power conditioning, two major functions...
Stochastic dynamic behavior of solar energy necessitates the use of robust controllers for photovoltaic (PV) power electronics interfaces to maximize the energy harvest by continuous operation at maximum power point (MPP). This paper proposes a sensorless current model predictive control maximum power point tracking (SC-MPC-MPPT) algorithm. By predicting the future behavior of the power conversion...
The use of multilevel inverters in Photovoltaic (PV) applications have attracted major attentions in both industry and academic research. This paper presents a PV system based on a single-phase Quasi-Z-Source (QZS) multilevel inverter with a great reduction in number of switches. The introduced inverter is based on a Multilevel DC link (MLDCL) structure and an H-bridge inverter. The MLDCL consists...
Wide bandgap (WBG) semiconductors including gallium nitride (GaN) and silicon carbide (SiC) offer significant performance improvement compared with conventional silicon power devices. The quasi-Z-source cascaded multilevel inverter (qZS-CMI) provides many advantages over the conventional CMI while applied in photovoltaic (PV) systems. In this paper, two solutions are proposed and compared to the design...
Double line frequency ripple (2ω ripple) power inherently exists in single phase dc-ac or ac-dc pulse width modulation converters because of instantaneous power unbalance between the dc and ac side. In order to achieve stable operation and maintain a high maximum power point tracking (MPPT) efficiency, traditional single-phase quasi-Z-source inverter (QZSI) for photovoltaic application uses large...
Large-scale Photovoltaic (PV) systems can be vulnerable to lightning due to the large areas their installation occupies and because of the volume of their constituent electrical and electronic equipment. Thus, the need for installing appropriate Lightning Protection Systems (LPS) is increasingly acknowledged, especially in PV plants that will be participating in regulated and liberalised energy markets...
The operation of a photovoltaic (PV) generating system under intermittent solar radiation is a challenging task. Furthermore, with high penetration levels of photovoltaic energy sources being integrated into the current electric power grid, the performance of the conventional synchronous generators is being changed and grid inertial response is deteriorating. This paper proposes a combined virtual...
(MPPT) maximum power point tracking controller is used such that the output power yielded by a photovoltaic (PV) system will be boosted to the particular maximum level. Although, due to sudden change in the irradiance, traditional MPPT controller method undertaken lag behind from inadequate robustness against sudden variation due to change in intensity of the solar radiation, poor transient response...
Solar PV (Photovoltaic, PV) power generation is currently one of the renewable energy with environmental-fashion trends and new alternative-green energy. Taiwan is located in a subtropical zone with sufficient sunshine and abundant solar resource, and thus, has great potential in solar power development. This project sets up a 30.78kWp grid-connected PV array demonstration system on the roof of a...
This paper presents the design of zero energy consumption on a stand-alone photovoltaic (PV) system for a small residential house. The load requirement which is less than 1,500 Wh per day located in Bangkok. System structure composes of three main parts: 600 W PV system, 2880 Wh energy storage of battery and charging system, and the 1 kW inverter for AC use. The proposed design process starts with...
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