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Grid-connected photovoltaic power system consists of simulation of solar modules, inverter main circuit, driver circuit, maximum power point tracking circuit, the MCU control display system and the FPGA, protecting circuit. Inverter main circuit is the analog output of solar modules through the inverter main circuit DC into AC power reverse, and then through the filter, the output stable AC; one FPGA...
The Photovoltaic (PV) energy is one of the renewable energies that attracts attention of researchers in the recent decades. Since the conversion efficiency of PV arrays is very low, it requires maximum power point tracking (MPPT) control techniques to extract the maximum available power from PV arrays. In this paper, two categories of MPPT algorithms, namely indirect and direct methods are discussed...
In this paper, an adaptive fuzzy MPPT controller is designed with FPGA, the design of fuzzy controller and adaptive control theory is described in detail, and it is discussed that how to implement adaptive fuzzy MPPT control with FPGA, and finally The solar storage control system is built with the controller, the experiment proved that the controller using this method can adjust the parameter according...
Performance, efficiency, cost of the power converters and their associated control, are important considerations for the commercialization of renewable power sources. In view of this, this paper proposes a reliable and low cost power electronics interface for photovoltaic energy systems, using a single DSP controller. The proposed approach achieves the following: (a) integrate the dc-dc converter...
Every photovoltaic (PV) array has unique point at which maximum power can be generated and extracted for different atmospheric conditions and output load. The maximum power point tracking is therefore critical for the success of PV arrays. All methods proposed earlier suffer from slow response; they oscillate around the maximum power point and ignoring the atmospheric conditions changing. This paper...
The study deals with an innovative system achieving an alternative source of energy supply from photovoltaic energy system which operates in case of utility power failure and provides continuity of supply even in medical appliances or industrial applications. It is also designed to reduce usage of utility supply which is generated from coals, nuclear having more carbons as outlets, lagging of sources...
In conventional grid-connected PV system, the control of real and reactive power is undertaken adjusting both modulation index and phase angle of the inverter. The maximum power point of the PV array is tracked by adjusting duty cycle of the dc-dc converter or modulation index of the inverter. The PWM pattern has to be optimized each time the index of modulation is changed which involves excessive...
This paper presents photovoltaic (PV) grid-connected power conditioning systems based on Z-source inverter. Using Z-source network, the system can work within a range of PV array output voltage wider than that of the conventional boost converter. It allows the use of the shoot-through switching state for boosting the input voltage, compensates dead-time effect which causes serious output voltage distortions...
This paper discusses modeling of a micro-grid with PV-Wind-Diesel generator hybrid system and its operations. The PV system is modeled with a DC/AC inverter with a pre-defined Maximum Power Point Tracking (MPPT) control. Fixed speed induction generator based wind turbines are used to model the wind farm. The diesel generator controls are modeled with droop governor and automatic voltage regulator...
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...
In this study, an interleaved boost converter cascaded with a battery charger buck converter is designed and implemented. The converter also has maximum power point tracking capability and the battery charge operation is designed for purpose of long life requirements of batteries. Proposed interleaved boost converter operates in conventional converter mode and in interleaved boost converter mode with...
The power yield of a PV array depends on solar radiation and temperature. Maximum power point (MPP) tracking techniques are employed to maximize the output power of a PV source. The solar panel is the primary power source of a nano satellite. To optimize the panel design, an electrical MPP tracking scheme is very vital to extract maximum power from the panel at all instances. MPP tracking schemes...
This paper describes the optimal operation performance of a brushless dc motor (BLDC), fed by a z-source inverter accompanying with photovoltaic (PV) system, drives a water pumping system. Albeit the conventional PV water pumping systems, including a two stages converter, the proposed system employs a Z-source inverter (ZSI) to extract the Maximum Power of PV array and supply the BLDC motor. Utilizing...
Small photo-Voltaic generators for residential applications are rapidly spreading all over the world in an effort to reduce polluting emissions. In this kind of applications the AC solar module concept has recently proven to be more advantageous than the conventional string architecture. According to the AC solar module concept, single PV modules are directly connected to the AC grid through a DC/DC...
It has been demonstrated that performing localized maximum peak power tracking (MPPT) on each photovoltaic (PV) panel, instead of using a single MPPT controller across the PV string can substantially increase the total harvested power, since each panel experiences unique illumination and temperature conditions. In this work, the effect of the dc-dc converter efficiency on the power savings from distributed...
Maximum power point tracking (MPPT) techniques are employed in photovoltaic (PV) systems to maximize the PV array output power which depends on solar irradiance and temperature. Among all the MPPT strategies, The P&O Maximum Power Point Tracking algorithm is mostly used, due to its ease of implementation. On the other hand, its main drawbacks are the waste of energy in steady state conditions,...
Maximization of power, which depends on solar irradiation and temperature conditions, from a photo voltaic (PV) generator is of special interest as the efficiency of the PV module is very low. A maximum power tracker is used for extracting the maximum power from the generator. To be effective with cellular converter architecture, however, a scheme must be able to accommodate a varying number of cells...
A battery charger with MPPT function for low-power PV system applications is presented in this study. For effective miniaturization, the battery charger is designed with high frequency operation. Some current-sensing techniques are studied, and their MPPT implementation is compared. A pulse charging method is also designed to prolong battery lifetime. The operation principles and design considerations...
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