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Using cascaded inverter in photovoltaic system, when number of cascaded unit increases, unbalance usage becomes a problem. Put forward the balance control method of chaos mapping and the method of photovoltaic power inspecting. It can be concluded from the distribute procedure based on random function that the active probability of each photovoltaic power and switching devices is same. The method...
It proposes a new control algorithm to increase efficiency of a grid-connected photovoltaic power generating system. It finds a maximum efficiency point by considering the quantity of power generated from PV arrays, the number of inverters, and an efficiency of the inverter. And then it assigns the optimized power, which is in a high efficiency condition, on the PV inverter. Operational principle...
This paper proposes a new multi-input dc boost converter for grid-connected hybrid Photovoltaic (PV)/Fuel cell (FC)/Battery power system, supplying a residential load. In this structure each switching cycle of proposed boost converter is divided in to five switching periods in comparison with conventional structure. These switching periods introduce five different duty ratios for the proposed boost...
Power converter's output signal harmonic control is currently becoming immensely important in medium and high power applications due to the development of new grid codes. Advancement in transistor technology has lead to significant changes from large thyristor-equipped grid-connected inverters to smaller and fast switching IGBT (Insulated Gate Bipolar Transistors) equipped converters. These IGBT's...
This paper proposes an approach for the control and optimization of power flow by integrating Plug-In Hybrid Vehicles (PHEV) to an existing residential photovoltaic system. Optimization of Power flow reduces the dependency for electric power from the grid and control involves determining the source from which residential load will be catered. The system built to achieve the goal is a combination of...
With more and more photovoltaic (PV) panels, energy storage devices and other small generators being put into service, it is necessary to integrate them into power systems. Grid integration provides a reliable means for customers to use renewable energy such as solar at its maximum and to use other sources as backup. Inverters are widely used as interfaces for these distribution resources. In this...
This paper deals with modeling, control and co-simulation of a single-phase single-stage Grid-interactive photovoltaic (PV) system with active filter functions. Single-phase PV systems are the most prevalent in roof-top configurations. In this paper, the modeling of a PV array with maximum power point tracking is performed in MATLAB/Simulink. The developed PV array model may be directly connected...
The National Renewable Energy Laboratory (NREL) conducts a variety of research in the area of hybrid power system integration and microgrids. NREL is studying hybrid (stand-alone) power systems incorporating photovoltaic power in the United States and assessing the characteristics and status of government-installed hybrid systems greater than 2 kW over the last 30 years. This research provides information...
The number of installed distributed generation (DG) in residential areas rapidly increases, specifically in the form of photovoltaics (PV), causing some undesired side effects such as voltage rise. Overvoltage can damage critical loads, but is also disadvantageous for the owner because inverters switch off in case of overvoltage, resulting in output loss. Since grid connected inverters essentially...
This paper focuses on the study of a two-stage, multi-string photovoltaic (PV) system connected by a common DC bus to a centralized inverter, interfaced with a utility grid. The distribution network model, load model and DC bus model are used for simulation. PV system exhibits non-linear v-i characteristics and an intermediate boost converter is employed to operate the PV array at its maximum power...
In this paper, a photovoltaic high frequency link inverter is proposed. The inverter is constituted of push-pull forward DC-DC converter and DC-AC inverter full bridge. The push-pull forward converter has some superiority in low voltage high current situation and achieves electrical isolation between the photovoltaic battery and the AC output. The push-pull forward converter is used to convert the...
This paper describe sizing of solar PV, DG set and battery bank for different configurations for share of solar power. Different configurations for integration of solar with diesel energy systems are explained in detail. The energy availability and reliability of the integrated energy system are highlighted The economics for implementation of different configurations are dealt with detailed discussion...
A comparative review is presented for integrated PEM Fuel Cell and Photovoltaic generating system to single phase utility grid. Different techniques of common coupling for integration have been investigated for this system. For both common AC bus and Common DC bus integration schemes, two different current control techniques have been investigated. The simulation result shows that common DC bus integration...
This paper proposes the maximum power tracking from the Photovoltaic system, which is interfaced with utility grid through a three phase inverter, by using a fuzzy logic controller. In this arrangement, three phase step up transformer is used to synchronize the inverter output with the grid ratings. Controller tracks and feeds maximum power to the utility grid. The linguistic variables have been selected...
A fuzzy sliding-mode robust controller with feed forward compensation is designed for grid-connected photovoltaic system. First, a integral sliding-mode controller is designed by exponential approach law to accelerate the system's starting phase, and for improving the stability of the system, the output of the sliding-mode controller is soften by fuzzy controller to reduce the flicking of the sliding-mode...
With the application of renewable energy, the distributed energy network is researched and developed widely. This paper designed the distributed stand-alone PV generating system with battery backup. The coordinated MPPT control of several parallel modules is designed to increase PV utilizing efficiency. The multi-variable multi-loop controller is designed to control the currents of each module, the...
This paper presents the results of the investigation of the control method for realization of individual MPPT (Maximum Power Point Tracking) of photovoltaic (PV) arrays in the grid-connected PV system with a single-phase three-level diode-clamped inverter. For a system with two PV arrays the idea of control is proposed to regulate the current of each PV array independently to operate in its MPP under...
Photo Voltaic (PV) generators today find application in the domestic field, where the decentralized power conversion concept has proven to be more advantageous than the conventional string architecture. According to the decentralized power conversion concept, PV modules are connected to a single phase AC grid through a two stage converter composed of a DC/DC converter and an inverter. The DC/DC converter...
In this paper a novel approach to the design of a PV module integrated inverter is presented. The parametric design of a transformerless topology is performed by avoiding the use of large capacitance values. Simulation and experimental results are shown.
This paper presents a maximum power point tracking (MPPT) method founded on the integration of a model-based technique given by a growing neural gas (GNG) network and a perturb and observe (P&O) algorithm. The neural network is trained off line to estimate the solar irradiance and the maximum power point starting from a measurement of voltage and current on the photovoltaic source. A variable...
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