The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
There has been a significant rise in photovoltaic (PV) system installations throughout the last decade. This has posed some technical challenges to the distribution grid operators. Unfamiliar impacts of these relatively new energy sources now should be handled more comprehensively. The rigidity of these impacts mostly depends on PV penetration level, grid and weather characteristics as well as the...
In the last decade, Bayesian Networks have become more and more popular in solving statistical problems. This method also attracts a lot of attention in reliability analysis community. In this paper, a time-varying Dynamic Bayesian Network modeling framework which is extended from basic Dynamic Bayesian Network model is proposed to analyze the non-stationary failure process. And the model is illustrated...
This paper proposes a new converter-inverter drive system for photovoltaic water pumping without the use of Battery. The converter is designed to drive a 3 phase drives like PMSM, Induction Motor directly from PV energy. This converter is mainly used for water pumping purposes in areas where electrical power is unavailable. Use of photovoltaic energy is one of the solution for this problem. It proposes...
This paper presents different converter topologies and techniques used for solar water pumping application. The techniques are taken from the literature dating back to the earliest methods. more than 10 converter circuitry and 19 distinct methods of MPPT control technicques have been introduced in the literature, with many variations on implementation. Problem identification is carried out on approximate...
The power converters have been improved with the development of power devices. The development of high-speed switching power devices enhanced the market of voltage source converters in many industrial fields. On-state loss and switching loss of power devices are significantly decreased. Thus, the size of power converters become small and the power converters with less heat generation have little environmental...
Long strings of photovoltaic (PV) modules have been observed to be prone to shading effects causing significant reduction in the system power output. To overcome this, distributed maximum power point-tracking (DMPPT) schemes have been proposed, in which individual dc-dc converters are connected to each PV module to enable maximum power extraction out of the PV modules. The output terminals of these...
In an effort to better understand the impacts of high penetrations of photovoltaic generators on distribution systems, Arizona Public Service and its partners have begun work on a multi-year project to develop the tools and knowledge-base needed to safely and reliably integrate high penetrations of utility- and residential-scale photovoltaics (PV). Building upon the APS Community Power Project - Flagstaff...
This paper presents a study for determining the maximum amount of PV solar generation that can be connected in a 27.6 kV feeder of a distribution utility - London Hydro. Various factors such as steady state voltage rise, Temporary Over Voltage (TOV), short circuit current and harmonic contributions, that could potentially constrain DG connectivity are investigated. Load flow studies with PSS/E and...
Photovoltaic (PV) solar farms are being increasingly utilized for producing energy, worldwide. To integrate such solar farms with the grid, a thorough technical study is required in terms of their impact on system voltage, power quality, response to faults and short circuit contributions, etc. These studies require a complete modeling of the PV solar system in an electromagnetic transient software...
This paper presents new trends in the dc-ac converters (inverters) used in renewable energy sources, particularly for photovoltaic (PV) energy systems. A review of the existing technologies is performed for both single-phase and three-phase systems, and the pros and cons of the best candidates are investigated. Then, a new control algorithm for a three-phase single-stage boost-inverter system is developed...
Single-phase current controlled, voltage source inverters are commonly used to feed unity power factor sinusoidal current into the distribution network from PV sources. A large 50 Hz transformer is often used at the inverter output for galvanic isolation and to prevent dc current injection into the distribution network. This transformer increases cost, size and overall power losses of the system....
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...
Conventional anti-islanding techniques used in grid-tied photovoltaic (PV) systems pose many disadvantages at high levels of PV deployment. One such issue is the inability of these systems to ride-through grid disturbances. In this paper, the use of a Power Line Carrier Communications (PLCC) Permissive anti-islanding scheme is investigated as a means of safely enabling ride-through operation of grid-tied...
Power quality problems such as variation of reactive power consumption and distorted current injection in distributed generation system can be compensated by a single-phase conditioner. The proposed conditioner works in feed forward mode and placed in parallel with the PV-inverters in the distributed generation system. A simple current extraction method is applied and an operating algorithm of the...
The DC/AC inverters are the key elements in grid-connected PV energy production systems. In this paper, new design optimization techniques focused on transformerless (very high efficiency) PV inverters are proposed. They have been developed based on an analysis of the deficiencies of the current, state-of-the-art PV inverters design technology, which limits the amount of PV energy supplied into the...
This paper presents a new micro-inverter topology that is intended for single-phase grid-connected PV systems. The features of the proposed topology are: (1) eliminating the double-frequency power ripple using small film capacitor; (2) improving the maximum-power-point tracking (MPPT) performance; (3) using long life-time film capacitors, which will improve the reliability of the inverter; and (4)...
In the transformerless photovoltaic (PV) system, the common mode ground leakage current may appear due to the galvanic connection between the PV array and the ground, which causes the safety issues and reduces the efficiency. To solve this problem, a novel inverter topology with switched capacitors is proposed in this paper. By connecting one pole of the PV cell directly to the neutral line of the...
This paper presents a high-frequency transformer link single-phase inverter system using a series resonant soft-switching scheme applied to photovoltaic AC modules. The proposed high-frequency transformer link inverter circuit consists of a full-bridge inverter, a series resonant circuit, an isolation transformer with center tap winding in secondary side and low-frequency distribution switches synchronized...
This paper presents a high performance, Z-source inverter topology for grid connected PV systems and also Synchronized Pulse-Width Modulation technique in single and three phase PWM inverter for Photovoltaic power generation system. Z-source inverter has buck-boost feature, which is possible because of additional shoot through state introduced in zero state of the conventional pulse width modulated...
As the output power of the photovoltaic (PV) cell changes with the insolation , PV cell temperature and cell voltage changing. It is necessary to control the operating point to draw the maximum power of the PV cell in order to increase system efficiency. In this paper, two-level single phase PV grid-connected system is designed, which mainly includes PV cell, BOOST circuit, inverter, filter and the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.