scholarly journals On the Injection of Sub/Inter-Harmonic Current Components for Active Anti-Islanding Purposes

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2183 ◽  
Author(s):  
Dionisis Voglitsis ◽  
Fotis Valsamas ◽  
Nick Rigogiannis ◽  
Nick Papanikolaou
Keyword(s):  
Fundamental Frequency ◽  
Parallel Operation ◽  
Output Current ◽  
Detection Zone ◽  
Fast Detection ◽  
Pv Systems ◽  
Harmonic Currents ◽  
Distortion Effect ◽  
Specific Frequency ◽  
Detection Response

Active anti-islanding schemes that are based on the injection of harmonic currents, such as the measurement of the impedance at a specific frequency or similar techniques, have been proposed for anti-islanding protection in photovoltaic (PV) systems due to their low impact on inverter active power, their fast detection response in island, and reduced non-detection zone (NDZ). Integer multiples of the fundamental frequency as well as sub/inter-harmonics have both been used for the implementation of those schemes. Although utilization of sub/inter-harmonics present significant advantages, they also present significant limitations. This work investigates those limitations, particularly the ones that are caused by the parallel operation of multiple inverters. In addition, the distortion effect that is caused in the output current of the widely used PV microinverters with pseudo dc-link (PV Pdc-MICs) is discussed and thoroughly analyzed. It is concluded that when the injection is performed asynchronously (without communication among the inverters) sub/inter-harmonics are unsuitable for utilization under the parallel operation of multiple inverters. It is worth noting that a strategy is proposed in the current work that retains the effectiveness of the harmonic injection scheme under the injection of integer multiples of fundamental frequency. On the other hand, the distortion effect that is caused by the sub/inter-harmonics on PV Pdc-MICs output current, has been evaluated as insignificant when harmonics are used for anti-islanding purposes. Finally, the theoretical/mathematical outcomes of this work are supported by simulation and experimental results.

Novel Digital Current Sharing Control Technique on Stand-Alone Photovoltaic Inverter

2013 ◽  
Vol 278-280 ◽  
pp. 1609-1614
Author(s):  
Jian Ru Liang ◽  
Yong Kang ◽  
Hong Tao Shan
Keyword(s):  
Photovoltaic System ◽  
Control Technique ◽  
Parallel Operation ◽  
Output Current ◽  
Good Characteristic ◽  
Current Sharing ◽  
Power Regulation ◽  
Logical Control ◽  
Average Current ◽  
Current Sharing Control

To share the loads and restrain circumfluence among parallel inverters in Stand- alone photovoltaic system (PV), it is described that a digital current sharing control technique for inverter parallel operation in detail in this paper. After the analysis of circumfluence of paralleled system on distributed-logical-control, characteristic of the power regulation, a novel digital power detection technique is deduced. With measuring and analyzing the instantaneous average current of all inverters and the output current of each inverter, both of the current components are used to control and regulate the amplitude and the phase of the output voltage. The proposed control technique on current sharing in the inverter paralleling system has been verified the good characteristic of restraining circumfluence by the results of the experiment.

scholarly journals Robust and Fast Detection of Small Power Losses in Large-Scale PV Systems

2021 ◽  
pp. 1-8
Author(s):  
Asmund F. Skomedal ◽  
Mari B. Ogaard ◽  
Halvard Haug ◽  
Erik Stensrud Marstein
Keyword(s):  
Large Scale ◽  
Power Losses ◽  
Small Power ◽  
Fast Detection ◽  
Pv Systems

scholarly journals PERANCANGAN INVERTER SATU FASA OFF-GRID MENGGUNAKAN DSPIC30F4011 DENGAN KONTROL ARUS METODE PROPORTIONAL RESONANT

TRANSIENT ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 753
Author(s):  
Segal Mancini Suroso ◽  
Iwan Setiawan ◽  
Bambang Winardi
Keyword(s):  
Power Plants ◽  
Harmonic Distortion ◽  
Current Control ◽  
System Response ◽  
Output Current ◽  
Current Output ◽  
Current Harmonics ◽  
Pv Systems ◽  
Bridge Type

The availability of fossil as fuel in conventional power plants is running low. This causes the use of renewable energy such as photovoltaic (PV) technology becomes very important. PV systems required inverters for converting DC voltage into AC voltage, where the quality of the inverter output current is very influential on the quality of power. Therefore, it is necessary to control the inverter current output which serves to improve the system response and minimize the current harmonics. In this research, a H-Bridge type of one phase Inverter is designed using 16-bit DSPIC30F4011 microcontroller with current control proportional resonant method. The inverter output current is fedback by the ACS712-05B current sensor. The test is carried out with the reference current range of 1 - 3 A on the load variation 7 Ω and 12 Ω. The test results show the actual current waveform of the inverter output is able to follow the reference current changes. Inductor value that not suitable and the effect of switching cause the ripple is still happening. The higher the output voltage of the inverter will result in the total current harmonic distortion becoming smaller.

scholarly journals Optimal Hybrid Filtering Strategy Using Adaptive Genetic-Fuzzy Logic Control for Harmonics Reduction in a Standalone Micro Hydroelectric Power Plant Coordinated with a PV System

2021 ◽  
Vol 5 (4) ◽  
pp. 56-62
Author(s):  
Adel Elgammal ◽  
Curtis Boodoo
Keyword(s):  
Fundamental Frequency ◽  
Eddy Current ◽  
Active Power Filter ◽  
Eddy Current Loss ◽  
Active Power ◽  
Active Filter ◽  
Power Filter ◽  
Harmonic Currents ◽  
Hybrid Filtering ◽  
Harmonic Components

Micro Hydro Power Plants are a type of power production that uses the force of river flows or waterfalls to generate electricity. The generator generates current waves and harmonic voltage, which are distorted wave disturbances that cause fundamental frequency multiplication. The major goal of this work is to design a reliable, efficient, and innovative harmonic mitigation approach for a stand-alone micro hydroelectric system that is coordinated with a photovoltaic renewable energy system utilising an active power filter. We may pick the active filter highest harmonic to be suppressed using the magnitude information supplied for each harmonic component. A hybrid filtering approach to remove harmonics and a novel MOGA optimization technique are part of the suggested harmonics reduction solution. The goal of this article is to determine the optimum filter for decreasing harmonics in an induction generator. As the harmonic damper, two filters were chosen: a passive filter and an active power filter. The suggested MOGA control method is compared to GA and evaluated on simulated data. In tracking harmonic components and fundamental frequency, the suggested MOGA control system provides high convergence speed and accuracy. It's extremely adaptable, and it can predict changes in the phase angle, amplitude, and fundamental frequency of harmonic components. When compared to the Genetic Algorithm method, it performs better. Simulation results using the SIMULINK/MATLAB simulation tool are delivered to evaluate the efficacy of the suggested active filter system. The impact of harmonic currents on the magnetic flux density is investigated using the rated condition as a reference. It has been established that the time harmonic is a significant element influencing generator performance. At the same time, the impacts of harmonic currents on the generator's eddy current loss, average torque, and torque ripple are investigated, as well as the mechanism of eddy current loss fluctuation.

Design and Implement of Three-Phase Inverter System with Double Mode of Grid-Connection and Stand-Alone

2011 ◽  
Vol 130-134 ◽  
pp. 4265-4269
Author(s):  
Huan Wang ◽  
Zi Long Yang
Keyword(s):  
Simple Structure ◽  
Voltage Source ◽  
Output Current ◽  
Fast Detection ◽  
Grid Connection ◽  
Three Phase ◽  
Seamless Transition ◽  
Bank System ◽  
Pv Generation ◽  
Three Phase Inverter

Three phase double mode inverter system was researched in this paper, whose input was battery bank system with PV generation. This system can be operated in stand-alone mode by connecting to local load and also in grid-connected mode by paralleling with grid. When in stand-alone mode, system worked as voltage source, while when in grid-connected mode, the output current of inverter was controlled following with grid. A transition algorithm to restrain current inrush and fast detection of switch and grid status make sure the seamless transition between grid-connected and stand-alone. This inverter system has advantage of simple structure and easy to implement, so that it was appropriate for micro-grid. .

scholarly journals Experimental Evaluation of Distortion Effect for Grid-Connected PV Systems with Reference to Different Types of Electric Power Quantities

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 416
Author(s):  
Marko Ikić ◽  
Jovan Mikulović
Keyword(s):  
Electric Power ◽  
Solar Irradiance ◽  
Experimental Evaluation ◽  
Weather Conditions ◽  
Pv System ◽  
Pv Systems ◽  
Distortion Effect ◽  
Different Types ◽  
Huge Impact ◽  
The Impact

Aware of the fact that the installed PV capacity and its power production rapidly increased in the last decade, with the huge impact that has been done to the power system, the distortion effects for grid-connected PV systems with reference to different types of electric power quantities will be presented in this article. The impact of the frequent fluctuation of solar irradiance on the behavior of the grid-connected PV system, due to cloud movements and resulting shadows and in terms of power quality and the evaluation of power components, is the topic of analysis in this research. Besides the simulation results of certain study cases, an experimental evaluation of electric power quantities on an actual PV system in real weather conditions was also performed. The experimental setup, formed through the combination of a PC and multifunctional I/O board with an appropriate software solution, was established and used for obtaining the target results. The methodology used for the evaluation of electric power quantities relied on the current physical components (CPC) theory for power definition. The experimental results were obtained for three different cases, namely, the low, medium, and high solar irradiance cases. On the basis of these results, the conclusions about distortion effects are given.

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