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Evaluation of the performance of a photovoltaic power plant installed in a building in the north of Portugal
摘要： In this work, the evaluation of the performance of a small-size photovoltaic plant, with 15 kWp of capacity, is made and some proposals for its optimization are presented. The plant consists of a grid-connected centralized system, where the output power is consumed in the same building. The PV plant production data of the last couple of years are analysed, filtering the periods of inoperation. To obtain an accurate prediction of the efficiency and power output, the characteristics of all plant components were introduced in SAM software. The results obtained through the simulations and the measured output power values were compared.
关键词： solar energy,SAM software,power plant,grid-connected,Photovoltaics
更新于2025-09-12 10:27:22
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Study on Conversion Losses of Several Converter Topologies Used in Grid Connected Photovoltaic System
摘要： For PV applications, many studies focus on maximum power extraction without evaluating losses in the conversion chain. In this research, a comparison between 3 grid-connected converters will be conducted. The 3 topologies boost-inverter, inverter-transformer and boost inverter structures will be studied especially in the point of view of losses. This comparison is intended to observe the performance of each structure in the function of the delivered power. Although each structure has its own feature in terms of galvanic isolation and geometric size, it is interesting to compare the losses and efficiency of each structure in order to select the appropriate application. The circuit model is simulated using PSIM software which already includes the thermal module to estimate the switching and conduction losses of power switches. The source of each topology is photovoltaic modules and the control of the circuits include the MPPT feature to absorb the optimum power from the PV modules.
关键词： Topology of conversion,Power electronics,Photovoltaic system,Conversion losses,Grid connected,Solar energy
更新于2025-09-12 10:27:22
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[IEEE 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) - Harbin, China (2019.8.11-2019.8.14)] 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) - Control and Modulation Method of a Three-phase Eight-switch Inverter for Two-stage Grid-connected Photovoltaic Systems
摘要： A novel transformerless two-stage photovoltaic (PV) grid-connected inverter is introduced in this paper. The system is composed of three-level boost (TL-Boost) DC/DC circuit and three-phase T-type eight-switch DC/AC topology. By using the multiloop interleaved control strategy and adjusting the conduction time of power switch phase of the first-stage boost DC/DC part, the inductor current ripple is reduced and the balance of DC bus capacitor voltage could be achieved respectively. Meanwhile, a nine-vector space vector pulse width modulation (SVPWM) algorithm based on optimal five-stage is adopted for eight-switch DC/AC inverter circuit, which could simplify the algebraic operation, reduce the switching loss and improve the utilization of the DC bus voltage. Finally, a 10kW experimental platform is built to verify the validity and effectiveness of the proposed control and modulation method.
关键词： TL-Boost,T-type eight-switch,nine-vector SVPWM,PV grid-connected inverter,multiloop interleaved control
更新于2025-09-12 10:27:22
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Design and Implementation of an IDA-PBC for a Grid Connected Inverter used in a Photovoltaic System
摘要： The paper presents an interconnection damping assignment - passivity based control (IDA-PBC) strategy applied to a grid-connected inverter interfaced Photovoltaic (PV) system. The PV power plant is integrated to the grid using a pulse-width-modulated converter. This is done to extract maximum energy from the renewable resource and feed it to the grid. The main contribution of this paper is to design a nonlinear control law based on IDA-PBC with a desired energy function along with an integral action. In the design of IDA-PBC, the Hamiltonian function is considered as a Lyapunov function candidate for analysing the stability criteria. In this paper, a step by step design procedure of the IDA-PBC is presented and the performance of the controller is compared with a conventional PI-based controller. A simulation study of the system is carried out in Matlab/Simulink environment. Finally, the simulation results show that the IDA-PBC with an integral action performs better during both transient and steady state conditions as compared with the PI-based controller.
关键词： Interconnection and damping assignment,Grid connected inverter,Photovoltaic energy conversion system,Port control Hamiltonian,Passivity based control
更新于2025-09-12 10:27:22
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[IEEE 2019 4th International Conference on Intelligent Green Building and Smart Grid (IGBSG) - Hubei, Yi-chang, China (2019.9.6-2019.9.9)] 2019 4th International Conference on Intelligent Green Building and Smart Grid (IGBSG) - Coordinated optimization scheduling of wind power, photovoltaic, photo-thermal and hydropower considering the schedulability of photo-thermal power stations
摘要： By analyzing the randomness and intermittentity of wind power output and PV power plant output and the schedulability of CSP（Concentrating Solar Power） power generation, a coordinated optimal scheduling strategy for wind power, photovoltaic, photothermal and hydropower is proposed. Based on integration benefit maximization, the target optimization function is constructed, and the fast non-dominated sorting genetic algorithm (NSGA-II) with elite strategy is used to optimize the objective function. The simulation results show that the wind power, photovoltaic and hydropower output are matched with the photothermal peaking characteristics, and the coordinated operation of wind photothermal power, hydropower and coordination the economics of wind power, photovoltaic, photothermal and hydropower generation light, systems. Abandoning the wind and reducing the effectively improving the efficiency of grid connection. This verifies the effectiveness of the proposed method.
关键词： Hydroelectric power,concentrating solor power,genetic algorithm,Grid-connected benefit,Coordinated optimization
更新于2025-09-12 10:27:22
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Economic and performance evaluation of grid-connected residential solar photovoltaic systems in Northwest China
摘要： The purpose of the study is to assess and compare the economy and performance of a hypothetical 5 kWp grid-connected residential solar photovoltaic (PV) system with and without batteries in Northwest China. The performance and economic analysis of the grid-connected residential PV system in five locations (Xi’an, Lanzhou, Xining, Yinchuan, and Urumqi) of different Northwest China has been performed through System Advisor Model (SAM) software developed by National Renewable Energy Laboratory (NREL) using the typical meteorological year (TMY) data of EnergyPlus weather database. The results indicate that the feasible system comprises 16 Shanghai JA Solar Technology JAM6-72-275 mono-crystalline modules rated at 275Wp, two GCI-3K-2G-H inverters rated at 2,990 W, and without flooded lead acid battery storage. The grid-connected PV systems are economically viable in the five locations, whereas the grid-connect PV/battery systems are not viable under the existing assumptions. The loan term has the greatest impact on the real LCOE and NPV compared to the considered sensitivity variables when the range of variation is within ±20%.
关键词： levelized cost of electricity,grid-connected residential solar photovoltaic system,economic,Performance,net present value
更新于2025-09-12 10:27:22
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Time series forecasting of solar power generation for large-scale photovoltaic plants
摘要： Accurate solar power forecasting is essential for grid-connected photovoltaic (PV) systems especially in case of fluctuating environmental conditions. The prediction of PV power output is critical to secure grid operation, scheduling and grid energy management. One of the key elements in PV output prediction is time series analysis especially in locations where the historical solar radiation measurements or other weather parameters have not been recorded. In this work, several time series prediction methods including the statistical methods and those based on artificial intelligence are introduced and compared rigorously for PV power output prediction. Moreover, the effect of prediction time horizon variation for all the algorithms is investigated. Hourly solar power forecasting is carried out to verify the effectiveness of different models. The data utilized in the current work comprises 3640 hours of operation data taken from a 20 MW grid-connected PV station in China.
关键词： neural network,statistical methods,PV power forecasting,time series analysis,deep learning,grid-connected PV plant
更新于2025-09-12 10:27:22
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Control technique for single phase inverter photovoltaic system connected to the grid
摘要： In photovoltaic system connected to the grid, the main goal is to control the power that the inverter injects into the grid from the energy provided by the photovoltaic generator. The power quality injected into the grid and the performance of the converter system depend on the quality of the inverter current control. In this paper, a control technique for a photovoltaic system connected to the grid based on digital pulse-width modulation (DSPWM) which can synchronize a sinusoidal output current with a grid voltage and control the power factor is proposed. This control is based on the single phase inverter controlled by bipolar PWM Switching and lineal current control. The electrical scheme of the system is presented. The approach is widely explained. Simulations results of output voltage and current validate the impact of this method to determinate the appropriate control of the system. A digital design of the control based on generator PWM using VHDL is proposed and implemented on Field-Programmable Gate Array “FPGA”. The functional structure of this system with digital control has been validated with experimental results.
关键词： Inverter,Control,Bipolar PWM,Grid connected photovoltaic system
更新于2025-09-12 10:27:22
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Adaptive Backstepping-based H∞ Robust con-troller for Photovoltaic Grid-connected Inverter
摘要： To improve the robustness and stability of the photovoltaic grid-connected inverter system, a nonlinear backstepping-based H∞ controller is proposed. A generic dynamical model of grid-connected inverters is built with the consideration of uncertain parameters and external disturbances that cannot be accurately measured. According to this, the backstepping H∞ controller is designed by combining techniques of adaptive backstepping control and L2-gain robust control. The Lyapunov function is used to design the backstepping controller, and the dissipative inequality is recursively designed. The storage functions of the DC capacitor voltage and grid current are constructed, respectively, and the nonlinear H∞ controller and the parameter update law are obtained. Experimental results show that the proposed controller has the advantage of strong robustness to parameter variations and external disturbances. The proposed controller can also accurately track the references to meet the requirements of high-performance control of grid-connected inverters.
关键词： grid-connected inverter,L2-gain robust control,adaptive backstepping control,Robustness,H∞ controller
更新于2025-09-12 10:27:22
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Grid Connected-Photovoltaic System (GC-PVS): Issues and Challenges
摘要： Smart grid is the key technology for an effective utilization of the Renewable Energy Sources (RES). The utilization of RES for the generation of electricity is increasingly gaining interest of researchers during the last decades. The main reason behind this is global incentivization, the increasing price of petroleum products, climate issues and deregulations in the energy market. As the Government of India, (MNRE i.e. Ministry of New & Renewable Energy) is targeting to generate 20000 MW power through grid-connected solar PVS by the year 2022 therefore, the main focus in this paper has been presented on power generation through grid-connected PVS. The emerging smart grid technology has enabled the grid-connected PVS as an evolving process in today’s world for electrical power generation. However, apart from so many advantages, there are several issues and challenges associated with the integration of PVS to the electric utility grid hence, the investigation to find out available possible solutions to overcome these issues becomes essential in order to enhance the performance of grid-connected PVS. The most severe constraint associated with this emerging technology is it high penetration level. If during low load conditions there is some mismatch found between the real power output and the load profile characteristics of PVS then it may result into large reverse power flow, high power losses or severe voltage violation. In this paper, several issues and challenges associated with the integration of solar PVS with the electric utility grid are presented.
关键词： Renewable Energy Sources,Grid Connected-Photovoltaic System,harmonics,voltage stability,RES,frequency stability,smart grid,GC-PVS
更新于2025-09-11 14:15:04