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With the advent of distributed generation, single-phase rooftop solar photovoltaic (PV) generators of small rating, feeding power to the utility grid has become popular. Cost and performance of the inverters used to integrate such systems to the grid depends upon the topology of the inverter used, modulation scheme employed, and the efficiency of auxiliary functions like maximum power point tracking...
In order to realize maximum power output of photovoltaics (PV), reduce line losses, and decrease abandoned solar energy during weak irradiance, a new medium voltage grid-connected PV system structure based on cascaded converters was proposed in this paper. A transformerless cascade step-up structure, instead of applying line-frequency step-up transformer, is proposed to connect PV directly to the...
This paper presents a new structure based on a line-commutated inverter (LCI) for photovoltaic (PV) applications. The proposed LCI circuit is able to inject the DC power to the grid at the unity power factor and with reduced harmonic levels. The proposed circuit with voltage-based maximum power point tracking (MPPT) is implemented in grid-connected PV system. The experimental results show that proposed...
A 31 LEVEL Asymmetrical Cascaded H-Bridge Multilevel inverter (ASCHBMLI) with DC-DC Fly back converter with single DC source for photovoltaic system using Maximum Power Point Tracking system. In this paper the photovoltaic (PV) system is given input to the primary side of DC-DC converter, where as the secondary side of the converter consists of ‘n’ no of turns with different output voltage. In Maximum...
A multiple drives solar-pumping system is presented in this paper. The system is based on a singlestage photovoltaic (PV) topology where an array of solar panels is connected to multiple inverters supplying equal centrifugal pumps. The inverters are operated to obtain maximum power from the PV system and a standard indirect vector control strategy is used to regulate the machines currents. Moreover...
This paper proposes a novel approach to photovoltaic (PV) module level power electronics (MLPE). Functionally, it is a hybrid of PV power optimizer and microinverter with such key features as shade-tolerant (or global) maximum power point tracking (MPPT), galvanic isolation, direct AC connectivity, PV module level monitoring and safety cut-off, flexibility of installation and PV power system sizing...
In this paper, a three-level Boost (TLB) converter maximum power point tracking (MPPT) control strategy for a two-stage photovoltaic (PV) system based on model predictive control (MPC) is proposed. This method realizes fast and precise control through establishment of a prediction model and minimization of a cost function. In the work, first a three-level predictive model for the boost converter is...
This work provides the guidelines to calculate the size of the DC-link capacitor to contribute with additional energy - for a short period of time - than the photovoltaic panel can supply under normal operating conditions. First, a model of a three-phase electric generation system is used that combines photovoltaic panels and an inverter with an LCL filter at network side. In addition, a control algorithm...
As days go, renewable energy resources getting lot of consideration due to the growing demand of energy. In view of all the renewable energy resources, solar energy is very prominent because sunlight is obtainable all over the year. This research work concentrates on performance and reliability enhancement of grid-connected Solar Photo Voltaic (SPV) power conversion system with a prominent implementation...
Renewable Energy Sources, especially solar energy, are important in mitigating environmental problems. Following, a step-by-step modeling of a photovoltaic (PV) system that can be connected to the grid through converters is achieved. The proposed mathematical model is implemented in MATLAB/ Simulink. A maximum power point tracking (MPPT) algorithm finds the maximum power for the operation of the PV...
Solar Panel Companion Inverter (SPCI) has been proposed as an H-bridge inverter embedded with a PV module. Each inverter converts the DC voltage output of the module, to a quasi-square wave voltage with variable pulse width. When these voltages are aggregated across multiple panels connected in a series string, they synthesize an AC waveform that can be interfaced with the power grid. The inverter...
In this paper, a maximum power point tracking (MPPT) architecture for micro-scale photovoltaic (PV) energy harvesting systems is presented. A switching DC-DC boost converter is used to provide the required voltage for the circuits of the ultra-low-power application. The MPPT tracks different illumination intensities through changing the input impedance of the boost converter. The proposed technique...
This research presents a Maximum Power Point Tracking (MPPT) algorithm for a solar photovoltaic (PV) power station which is constructed based on modified circuit topology of the Modular Multilevel Converter (MMC). The proposed MPPT is featured with Optimized Finite-Control-Set Model Predictive Control (FCS-MPC) to provide continuous extraction of maximum solar energy. The estimation-based approach...
Renewable energy sources are obviously accepted as clean energy sources of future. The solar energy is the most popular among other renewable energy sources in all over the world. Many studies are performed on photovoltaics (PVs) and solar energy systems. Inverter is the most important power converter section of photovoltaic systems in terms of efficiency in changing weather conditions. This study...
Stochastic dynamic behavior of solar energy necessitates the use of robust controllers for photovoltaic (PV) power electronics interfaces. Such robust controller maximizes the energy harvest through continuous operation using a maximum power point tracker (MPPT). A model predictive control MPPT (MPC-MPPT) is proposed in this paper for a quasi-Z-source inverter (qZSI) based grid-connected PV power...
In most large-scale grid-tied photovoltaic (PV) plants, central inverter configurations are used, mainly due to higher converter efficiency and lower cost per kW. However, compared to other configurations, its Maximum Power Point Tracking (MPPT) efficiency is the lowest since it is the less distributed configuration. Under non-uniform conditions, as mismatch caused by aging and/or partial shading,...
As the penetration level of grid-connected PV systems increases, more advanced control functionality is demanded. In order to ensure smooth and friendly grid integration as well as enable more PV installations, the power generated by PV systems needs to be flexible and capable of: 1) limiting the maximum feed-in power, 2) ensuring a smooth change rate, and 3) providing a power reserve. Besides, such...
In microgrids, photovoltaic (PV) and storage are integrated as a droop-controlled ideal source, which is not practical and challenges the system efficiency. Instead, PV-storage can be allocated separately. This PV-storage independent system is more flexible and easier to optimize. But, the conventional PQ-controlled PVs rely on master voltage-controlled storage sources. In this paper, a novel operation...
This paper presents a novel low-cost photovoltaic (PV) microinverter with an ultra-wide MPPT voltage range. This approach is based on the two-stage energy conversion where the front-end boost half-bridge DC-DC converter is used to step up the fluctuating PV voltage to a stabilized high DC voltage, which is next transformed to a grid compliant AC voltage by the grid-tied inverter. The operation principle...
This work proposes the sub-module integration of flyback converters with an unique unfolding H-bridge inverter, for photovoltaic (PV) microinverter application. An dedicated control strategy is also proposed. This sub-module integration proposed to remove the existing junction box of the PV module and replace the three by-pass diodes with three individual DC-DC converters connected to a single-phase...
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