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In case of the grid connected transformerless photovoltaic (PV) inverter, the leakage current through the parasitic capacitance of the PV panel can cause very serious electromagnetic interference problems. In this paper, a more accurate high frequency PV array model is proposed. It includes the influence of PV frame, mounting rack, solar cell material and area. Based upon that model, the common mode...
In a transformer-less photovoltaic (PV) grid-connected system, there exists a galvanic connection between the grid and the PV array. Without any transformer in the inverter, common-mode leakage currents can flow through the stray capacitance between the PV array and the ground. This paper first analyzes the equivalent common-mode circuit of single-phase inverter, and compares several single-phase...
The inclusion of Distributed Energy Resources (DER) into the grid is a great way to maximize and increase power generation at large. However it could also result in power quality issues due to their generation being dependent on external factors such as the weather. This paper aims to investigate power quality problems and potential solutions in low-voltage networks with high penetration of DER sources...
In this paper, a complete simulation model of a single phase grid-connected photovoltaic (PV) system with associated controllers is presented. The simulation model is developed in MATLAB/SIMULINK tool. The main component of the single phase grid-connected PV system are, a PV array, a dc-dc boost converter, a PWM based voltage source inverter and filter. For high efficiency of the PV system used maximum...
In this paper, a comparison between fuzzy logic controller (FLC) and conventional PI controller has been presented for interfacing PV array with utility grid through a three-phase line-commutated inverter. The main objective of the controller is providing maximum power for utility grid. The Simulink model of the studied schemes has been built using MATLAB/PSB for generating firing pulses of the thyristors...
World's fuel sources are decreasing and global warming phenomena cause the urgency to search for alternative energy sources. Photovoltaic system has high potential since it is clean and environmental friendly. Standalone photovoltaic (SAPV) system is usually chosen as an alternative to grid utility, where excess to main grid is impossible. The system is designed to fulfill a specific load demand,...
Unintentional islanding is a more relevant issue today due to rising penetration of solar photo voltaic systems on distribution grids. As the smart grid matures, better techniques for mitigating this problem have to evolve. Commercially available, inverter-resident, islanding detection based methods are aplenty and a lot others are being developed at research level. This work is oriented towards trying...
In this paper, hybrid carrier based space vector modulation technique (HCBSVM) is designed for asymmetric cascaded multilevel inverter (CMLI). The asymmetric CMLI is used in the area of high power medium voltage applications. In the proposed system, photovoltaic (PV) array and dc source are used as asymmetric sources. The proposed HCBSVM scheme reduces the harmonics in the output voltage of CMLI....
This paper presents modeling of existing proprietary-based 1.6 kWp single-phase grid-connected photovoltaic (PV) system in Electrical Energy Conversion Research Laboratory (EECRL) of School of Electrical Engineering and Informatics (SEEI), Institute of Technology Bandung (ITB). The PV system was a grant from Indonesia State Utility Company (PT. PLN), included with the propietary inverter. Although...
This paper introduces the study of a single phase bidirectional high frequency link inverter for photovoltaic application in grid tie system, based in the Push-Pull topology. The main advantages of high frequency link inverters are: the low cost and high power density of the transformers, and the capacity to provide galvanic isolation between the photovoltaic panels and the grid. Furthermore, the...
PV generation systems are characterized by the variability of the power produced due to environmental conditions and changing sun irradiance. In addition, PV panels do not have overload capability and therefore they cannot supply power above their maximum power points during load transients. To solve these issues the use of energy buffer elements such as Supercapacitors has been proposed, which can...
Due to the advantages of high efficiency and low cost, grid connected inverter based transformerless PV systems have been widespread during the last two decades. The key problem, which arises in absence of galvanic isolation, is the presence of a common mode (CM) leakage current on both AC and DC side of the inverter. In this paper, the influence of long DC side cable to the CM leakage current is...
This paper proposes an allocation control scheme to maximize resource sharing of grid connected inverters. Grid connected inverters with diverse capabilities are increasingly present in the utility grid and are regarded as key components in future Smartgrids and microgrids. Due to the aggregation of grid connected inverters in the power network, allocation of their available resources is a new challenge...
Solar photovoltaic systems are an increasing option for electricity production, since they produce electrical energy from a clean renewable energy resource, and over the years, as a result of the research, their efficiency has been increasing. For the interface between the dc photovoltaic solar array and the ac electrical grid is necessary the use of an inverter (dc-ac converter), which should be...
This paper investigates power control to regulate both inputs of dual-input DC/AC inverter independently. The dual-input DC/AC inverter topologies can be either neutral point clamp (NPC) or T-type three-level inverter. A mathematical model is established to derive the relationship between the dual-input power and the duty cycle of the DC/AC inverter. Then a control scheme is proposed to decouple the...
This paper proposes a photovoltaic model which is presented by using single diode. The photovoltaic array configuration is considered based on the effect of irradiance and temperature. The different sunlight intensity on the photovoltaic array will generate multiple maximum power points. These multiple maximum power points are basically lower than the maximum power point in unshaded condition. Therefore,...
Current technology developments in energy storage and PV systems raise new possibilities for combining them, in order to deal with grid integration of PV systems. This paper studies the operation of a very large scale PV power plant, which includes an energy storage system for capacity firming. The energy storage is distributed in the PV plant, i.e. many energy storage units are connected in parallel...
Grid-tied photovoltaic inverter manufacturers rarely reveal the type of power electronic circuit topology and the type of technique used to track maximum power, control of power injected into the grid, and method used to avoid islanding operation. In this paper, an attempt is made to gain such information on a commercial 2.5 kW inverter by measuring the voltage and current waveforms under normal operation...
Partial shading on a solar photovoltaic (PV) array is known to have a significant impact on its energy yield. This paper presents experimental measurements on a 2 kW grid-tied PV array under different shading profiles that are caused by structures of various shapes at different times of the year. A simulation method that provides an accurate description of shadow movement of the simpler structure...
Electromagnetic magnetic interference (EMI) issue has become one of the urgent problems to be solved in the photovoltaic (PV) inverter system. Therefore, it should not be ignored. In order to optimize the EMI filter design, high frequency characteristic of a PV system is studied in this paper. A conducted EMI model is proposed. The proposed model take into consider the influences of PV array parameters,...
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