Grid-connected Photovoltaic Power System Research Articles

Modeling and Simulation for an 8 kW Three-Phase Grid-Connected Photo-Voltaic Power System

Abstract Gird-connected Photo-Voltaic (PV) systems rated as 5-10 kW level have advantages of scalability and energy-saving, so they are very typical for small-scale household solar applications. In this paper, an 8 kW three-phase grid-connected PV system model is proposed and studied. In this high-fidelity model, some basic PV system components such as solar panels, DC-DC converters, DC-AC inverters and three-phase utility grids are mathematically modelled and organized as a complete simulation model. Also, an overall power controller with Maximum Power Point Control (MPPT) is proposed to achieve both high-efficiency for solar energy harvesting and grid-connection stability. Finally, simulation results demonstrate the effectiveness of the PV system model and the proposed controller, and power quality issues are discussed.

A Survey on Smart Grid-Connected Photovoltaic Power Systems and Its Issues

Photovoltaic power generation refers to the use of solar photovoltaic cells to the solar radiation can be directly transformed into electricity generation. Distributed photovoltaic power generation, refers to the construction in the vicinity of the user's location, the operation mode to the user side of spontaneous self-occupied mainly, the excess power on the Internet, and in the distribution system to balance the characteristics of the photovoltaic power generation facilities. Distributed photovoltaic power generation follow the principle of local conditions, clean and efficient, decentralized layout, the principle of the nearest use, and make full use of local solar energy resources, alternative and reduce fossil energy consumption. This paper aims to investigate and emphasize the importance of the grid-connected PV system. The investigation was conducted to critically review the literature on expected potential problems associated with issues of PV based grid system. The main purpose of this paper is to discuss the basic understanding of photovoltaic (PV) based distributed generation power system and how these power flows will influence the performance and stability of a power system. Some of the PV grid integration issues such as voltage regulation, voltage sags, harmonic distortion, etc are also discussed and possible solutions are also mentioned.

A Comparison Study on Types of PV for Grid Connected Photovoltaic Power

Grid connected photovoltaic (PV) power systems is today’s breakthrough for renewable energy source in electricity generation Grid-connected photovoltaic (PV) power systems have the advantage of more effective utilization for highest renewable source of electricity generation and tendency to continual growth in the next years. The output performance grid connected photovoltaic (PV) power systems is influenced by the impact of cell temperature or ambient temperature and solar irradiance of the solar module. This paper highlights the effect of output energy of solar module by implementing different types of solar module technology and selecting the highest energy output of the module technology for modelling and simulating the design of grid connected photovoltaic (PV) power system using Matlab/Simulink.

The Design of a Grid-connected Photovoltaic Power Conditioning System

In view of the grid-connected photovoltaic power system’s function of load shifting to the power network and to achieve the coordinated control of inverter and battery management system, this paper designed a grid-connected photovoltaic power conditioning system (PCS) with function of bi-directional conversion. The function of the PCS is set, the control strategy and technology indexes is also given out. The research improves the solar energy utilization efficiency of the grid photovoltaic power generation, and makes the function of load shifting to the power network coming true without interference, so as to achieve the purpose of saving energy.

Power Quality Improvement of Single Phase Grid Connected Photovoltaic System

Abstract: This paper presents a single-phase grid-connected photovoltaic power system with the capability of maximum power point tracking (MPPT) of photovoltaic (PV) array and reactive power compensation. The non linear characteristics of the proposed modified p-q theory have been improved with the help of maximum power point tracking (MPPT) controller. MPPT controller helps to feed the inverter with maximum power from the solar grid, for switching pattern generation hysteresis controller is used. The simulation results developed in MATLAB/Simulink software, verify the performance and advantages of the proposed system used to integrate the single phase grid to photovoltaic for enhancing the power quality. Also the proposed scheme has been verified in laboratory setup for its real time implementation.

Harmonic Mitigation in Three-Phase Power Networks with Photovoltaic Energy Sources

Energy systems based on photovoltaic (PV) cells have increased at a rapid pace. Therefore, power converters have been widely employed in power systems to enhance the quality and magnitude of the power drawn from renewable energy sources. An LCL filter for connection of an inverter to the grid is often used to reduce harmonics generated by the inverter. According to different design techniques, optimal parameters of LCL filter tend to vary in a wide range. This paper presents a new approach to an LCL filter. A phase shifting transformer placed in the structure of an LCL filter to minimize harmonic current. Methods and techniques described in this paper are particularly suitable for grid-connected PV power systems.

Microgeração Fotovoltaica Conectada à Rede Elétrica: Considerações Acerca de Sua Difusão e Implantação no Brasil

Grid-connected photovoltaic power systems appear as a technological option to meet the growing demand for energy. The article discusses the economic and technical barriers and the potential for deployment of these systems in Brazil from the rules of ANEEL Resolution No. 482/2012. The work consists of a survey for the description and identification of the opportunities and benefits as well as the difficulties and barriers in the dissemination of this type of generation system. Thus, for the diffusion of the generation, there must be mutual effort between segments that permeate the generation, transmission, distribution and commercialization of energy.

The potential and economic viability of solar photovoltaic power in Ghana

ABSTRACTIn this study, the potentiality and economic viability of solar photovoltaic (PV) in Ghana was assessed using RETScreen software. 5 MW of grid-connected solar PV power system using SunPower SPR-320E-WHT-D PV module can be harnessed from Navrongo, Bawku, Wa, Tema, Bolgatanga, Axim, Salaga, Kintampo, Kete Krachi, Tamale, Hohoe, Koforidua, Ejura, Takoradi, Bole, Sunyani, Bibiani, Cape coast, Prestea, and Akuse, which requires US$17,752,179 of investment capital and 25,313 m2 of land for PV installation. The potential of 5 MW grid-connected PV development for Accra, Kumasi, Wenchi, and Tafo are limited. However, there are solar PV energy potentials for low-capacity PV modules for these locations. Investing in solar photovoltaic technology is capital intensive in a developing country like Ghana. However, Government’s effort to provide incentives like subsidies and creating the economic environment for private sector investment will boost investment possibilities of renewable energy in Ghana, which can help in curbing the recent power outages and load shedding, thereby increasing productivity and economic resilience.

Voltage Stability Analysis of Grid-connected Photovoltaic Power Systems Using CPFLOW

This paper proposes a CPFLOW-based algorithm for analyzing voltage stability of grid-connected photovoltaic (PV) power systems. The main advantages of this algorithm are its computational speed and the ability to overcome the numerical difficulty near the point of voltage collapse. Using the proposed algorithm, a numerical study is conducted to analyze voltage stability of IEEE 14-bus and 39-bus systems under varying conditions. It is shown via numerical results that higher PV penetration levels can greatly improve the overall system voltage stability. An evaluation of PV installation locations also shows that each location on the grid has different degrees of suitability, regarding stability impact. Integrating PV generations at bad locations can cause serious degradation to system voltage stability.

Optimal sizing of a hybrid grid-connected photovoltaic and wind power system

Abstract Hybrid renewable energy systems (HRES) have been widely identified as an efficient mechanism to generate electrical power based on renewable energy sources (RES). This kind of energy generation systems are based on the combination of one or more RES allowing to complement the weaknesses of one with strengths of another and, therefore, reducing installation costs with an optimized installation. To do so, optimization methodologies are a trendy mechanism because they allow attaining optimal solutions given a certain set of input parameters and variables. This work is focused on the optimal sizing of hybrid grid-connected photovoltaic–wind power systems from real hourly wind and solar irradiation data and electricity demand from a certain location. The proposed methodology is capable of finding the sizing that leads to a minimum life cycle cost of the system while matching the electricity supply with the local demand. In the present article, the methodology is tested by means of a case study in which the actual hourly electricity retail and market prices have been implemented to obtain realistic estimations of life cycle costs and benefits. A sensitivity analysis that allows detecting to which variables the system is more sensitive has also been performed. Results presented show that the model responds well to changes in the input parameters and variables while providing trustworthy sizing solutions. According to these results, a grid-connected HRES consisting of photovoltaic (PV) and wind power technologies would be economically profitable in the studied rural township in the Mediterranean climate region of central Catalonia (Spain), being the system paid off after 18 years of operation out of 25 years of system lifetime. Although the annual costs of the system are notably lower compared with the cost of electricity purchase, which is the current alternative, a significant upfront investment of over $10 M – roughly two thirds of total system lifetime cost – would be required to install such system.

Power Quality Analysis for PV Grid Connected System Using PSCAD/EMTDC

Power quality is the main concern in power distribution systems. Poor power quality could cause disturbance and financial losses to consumers. It may also cause electrical appliances to overheat, damage and operate in undesired regions. Other than that, power distribution components such as transformers could also experience core saturation and overheating to the winding. This paper investigates potential power quality issues in a photovoltaic-grid connected power system. A real-life power distribution system is first modelled in PSCAD and it is then integrated with a photovoltaic system to form a micro-grid power system. Several case studies are conducted to identify any potential power quality issues with the micro-grid power system. The simulation results shows that the micro-grid power system experiences various power quality issues, such as inrush current, power fluctuation, frequency fluctuation, harmonic distortion and low power factor.

Research on Grid-Connected Photovoltaic Power System Based on Virtual Synchronous Generator

In order to realize the solar photovoltaic (PV) system connecting with grid friendly, a PV system with voltage-controlled inverter based on virtual synchronous generator (SG) is presented. This kind of system has features of SG, which supply the virtual moment of inertia to grid. The mathematical model of PV and virtual SG is built, and the control strategy of the maximum power point tracking (MPPT) is also studied in the paper. Simulation model of the grid-connected PV power system is built on Matlab/Simulink. Finally, correctness and feasibility of this system are verified by simulation results.

Grid-connected Photovoltaic Power Systems and Power Quality Improvement Based on Active Power Filter

This paper presents a Parallel Active Power Filter (PAPF) using Photovoltaic cells Energy to feed linear or nonlinear loads with current perturbations compensation and the excess of the energy is injected into the mains. As a result of using instantaneous p-q theory as a control scheme, the multi-function operation such as harmonic elimination, reactive power control and uninterruptible power supply will be achieved. The system consisting of Photovoltaic cells, connected to a diode rectifier feeding a parallel active power filter is simulated in MATLAB/SIMULINK environment. The simulation results prove the efficiency of using the proposed method for Photovoltaic cells energy injection and power quality improvement in the grid power system.

Grid-connected Photovoltaic Power Systems and Power Quality Improvement Based on Active Power Filter

Grid-connected Photovoltaic Power Systems and Power Quality Improvement Based on Active Power Filter

Performance and feasibility assessment of a 1.4 kW roof top grid-connected photovoltaic power system under desertic weather conditions

This paper presents a design and evaluation practice of a grid-connected photovoltaic system installed in Sohar, Oman. Hourly solar radiation and ambient temperature data for one year time are utilized. The designed system is implemented practically and tested for six months to check its productivity and feasibility. The system is evaluated using three technical criteria which are capacity, yield and performance factors. In addition, system's feasibility is evaluated in terms of cost of energy and payback period. The results show that the capacity and the yield factors for the proposed system are 21% and 1875kWh/kWp/year respectively. In addition, the performance factor of the proposed system is 84.6%. In the meanwhile, the cost of the energy generated and the payback period of the proposed system are 0.045USD/kWh and 11 years, respectively. This study contains valuable experiment data for those who are interested in photovoltaic system in Oman and nearby desertic zones.

A new model to predict the energy generated by a photovoltaic system connected to the grid in low latitude countries

The use of photovoltaic solar energy is a growing reality worldwide and its main objective is to meet electricity demand in a sustainable manner. The so-called Grid-Connected Photovoltaic Power Systems (GCPS) prevail in urban zones, together with Building-integrated Photovoltaics (BIPV); whose performance and energy efficiency depends on different factors. The main aspects include those related to the solar radiation available in the geographical location of the facility, the climate, the orientation and tilt of the used surfaces, the appropriate design of the system and the quality of the components. Therefore, several methods have been proposed to try to predict the influence of the aforementioned variables on the amount of electricity produced. However, the majority are very tedious to implement or do not take the specific characteristics of the system into account.This paper proposes a simple and reliable expression, which can be used in low latitude countries. The case study is likewise performed for Colombia, with a comparative analysis for different cities of the angular losses and due to dirt, the losses due to temperature, the DC–AC conversion losses and the Performance Ratio of the system (PR).

Optimal Design and Simulation of a Grid-Connected Photovoltaic (PV) Power System for an Electrical Department in University of Tripoli, Libya

Optimal Design and Simulation of a Grid-Connected Photovoltaic (PV) Power System for an Electrical Department in University of Tripoli, Libya

Optimal Design and Simulation of a Grid-Connected Photovoltaic (PV) Power System for an Electrical Department in University of Tripoli, Libya

Optimal Design and Simulation of a Grid-Connected Photovoltaic (PV) Power System for an Electrical Department in University of Tripoli, Libya

Optimal Design and Simulation of a Grid-Connected Photovoltaic (PV) Power System for an Electrical Department in University of Tripoli, Libya

Optimal Design and Simulation of a Grid-Connected Photovoltaic (PV) Power System for an Electrical Department in University of Tripoli, Libya

Optimal Design and Simulation of a Grid-Connected Photovoltaic (PV) Power System for an Electrical Department in University of Tripoli, Libya

Optimal Design and Simulation of a Grid-Connected Photovoltaic (PV) Power System for an Electrical Department in University of Tripoli, Libya