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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Estimation of the Probability of Integration of Photovoltaic Microgeneration using Fuzzy Logic
摘要： There is a great diversification of the sources used for the generation of electric energy in Brazil, which was accentuated with Normative Resolution 482 of 2012, of the National Agency of Electric Energy (ANEEL). From this resolution and the creation of some governmental policies, the participation of the Distributed Photovoltaic Generation (DPG) in the electric system began to be made feasible and its penetration levels tend to increase continuously. Therefore, it is necessary to develop methods capable of estimating the potential of DPG integration in the distribution system, so that the distributor can adapt it when necessary and carry out more reliable planning. Therefore, this paper proposes a methodology, based on fuzzy logic, to estimate the probabilities of DPG insertion in low voltage networks. The variables adopted reflect the trends in the electricity sector, such as energy prices, the cost of photovoltaic systems (PVS), the incentives given to the DPG, the attractiveness of the DPG and the time of return on investment. The output of the fuzzy inference system presents a probability of integrating the DPG into the current distribution system.
关键词： Photovoltaic Generation,Integration of DPG,Distribution network,Fuzzy Logic
更新于2025-09-16 10:30:52
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Line-End Voltage and Voltage Profile along Power Distribution Line with Large-Power Photovoltaic Generation System
摘要： In recent years, the introduction of the photovoltaic generation system (PV system) has been increasing by promoting the use of renewable energy. It has been feared that the reverse current from the PV system may cause an unacceptable level of voltage rise at the interconnection node in the power distribution system. This paper discusses the e?ects of the reverse current on the voltage rise and fall characteristics of the interconnection node and the voltage pro?les along the power distribution line. When the line current on the circuit is small, the voltage on the line monotonically increases from the sending end to the receiving end. When a relatively large current ?ows, it causes a voltage reduction near the distribution substation. Furthermore, on the basis of the voltage aspects in the power distribution system with a large PV system, the allowable limits of the line current and the output power from PV system are investigated.
关键词： photovoltaic generation system,voltage rise,reverse current,power distribution system,voltage profile
更新于2025-09-16 10:30:52
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Comparison of the Performance of Photovoltaic Power Generation-Consumption System with Push-Pull Converter under the Effect of Five Different Types of Controllers
摘要： In this study, a dynamic system has been modeled to efficiently use a photovoltaic generation and control system (PVGCS) for driving of a medium power off-grid electric machine. The measures have been taken to respond to three different disturbing factors in this system. First, the photovoltaic panels selected for energy generation have a variable solar radiation effect. Second, the DC motor load at the system output is assumed to have a variable torque. Third, a variable reference voltage, which is determined even in the case of time-varying energy generation and consumption of the system, is followed with minimum error. For this purpose, a push-pull converter has been chosen as a highly flexible structure since it is predicted that it can provide stable and effective variable DC voltage at increasing and decreasing level required for DC motor. The control of the DC voltage at different levels to be provided by the push-pull converter is performed by PI, fuzzy logic, fuzzy-tuned PI, 2-DOF PI, and fractional PID logic whose coefficients are selected by appropriate methods, respectively. The system efficiency and stability under the influence of these five different advanced controllers are compared. In the case of two disturbing factors affecting the system, the difference values (errors) of the voltage generated by each selected controller with the reference voltage are determined comparatively. The studies were carried out by using dynamic system modeling in MATLAB-SIMULINK software. In addition, the results of this study proved which type of controllers is more successful in controlling systems with the second order and more instability factors and which of them responds to sudden changes in errors more quickly.
关键词： fuzzy logic controller,fuzzy-tuned PI controller,2-DOF PI controller,fractional PID controller,push-pull converter,PI controller,photovoltaic generation,DC motor
更新于2025-09-16 10:30:52
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Analysis of Grid-Connected Photovoltaic Generation Systems in the Harmonic Domain
摘要： In this contribution, a harmonic domain (HD) model of grid-connected photovoltaic (PV) generation systems is proposed. The topology of the PV generation system contains a PV array connected to a DC/DC converter and a DC/AC converter, coupled to the grid through a filter. The individual components of the PV system are modeled in the HD. The PV array is represented as a Thevenin equivalent, whereas the DC/DC converter and the DC/AC converter are represented in the HD using switching function matrices. The periodic steady-state solution of the PV system is obtained through simple matrix/vector operations. The results obtained by the proposed model are validated against the response obtained with the PSCAD/EMTDC simulator, widely accepted by the power industry.
关键词： grid-connected,photovoltaic generation,periodic steady state,harmonic domain
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Performance and Durability Analysis of Photovoltaic Panels under Different Climatic Conditions
摘要： Analysis of the performance and durability of photovoltaic (PV) panels allows a coherent and assertive planning. In this study the main causes of PV panel's degradation are evaluated, thus presenting a way to obtain its degradation rate (DeR). The DeR was applied to a simulation in the program OpenDSS to verify electrical losses along panel’s lifetime. Simulations in different scenarios were run to evaluate the degradation levels in different locations. With these results was possible to predict the durability of some PV modules and to validate them with a reasonable precision degree. The conclusion is that in hot climates with high degradation rates, the PV generation may remain higher along the guarantee period than in locations where degradation rates are lower. Thus, this study provides a substantial assertiveness for investments in PV generation.
关键词： PV panel performance,Lifetime,Photovoltaic generation,Degradation rate
更新于2025-09-16 10:30:52
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Data-Driven Robust Coordination of Generation and Demand-side in Photovoltaic Integrated All-Electric Ship Microgrids
摘要： Fully electrified ships, which is known as the “all-electric ships (AESs)”, have the potentials to bring great economic /environmental benefits. To further improve the energy efficiency of AESs, PV generations are gradually integrated, which introduces uncertainties to the AES operation. However, current researches mostly focus on sizing problem whereas rarely concern the operation. In this perspective, a data-driven robust coordination of generation and demand-side is proposed to properly address the onboard PV generation uncertainties as well as reducing the fuel cost of AESs, which consists of an extreme learning machine (ELM) based PV uncertainty forecasting method and a two-stage operating framework, where the first stage for the worst PV generation case and the second stage targets at the uncertainty realization. A 4-DG AES is implemented into the case study and the simulation results show that the ELM-based method can well characterize the PV uncertainties, and the two-stage operating framework can well accommodate the onboard PV uncertainties. Further analysis also demonstrates the proposed method has enough flexibility when facing working condition variations.
关键词： mobile microgrid,robustness,extreme learning machine,coordination of generation and demand-side,All-electric ship,photovoltaic generation
更新于2025-09-12 10:27:22
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Optimal Scheduling of Residential Home Appliances by Considering Energy Storage and Stochastically Modelled Photovoltaics in a Grid Exchange Environment Using Hybrid Grey Wolf Genetic Algorithm Optimizer
摘要： The transformation of a conventional power system to a smart grid has been underway over the last few decades. A smart grid provides opportunities to integrate smart homes with renewable energy resources (RERs). Moreover, it encourages the residential consumers to regulate their home energy consumption in an effective way that suits their lifestyle and it also helps to preserve the environment. Keeping in mind the techno-economic reasons for household energy management, active participation of consumers in grid operations is necessary for peak reduction, valley filling, strategic load conservation, and growth. In this context, this paper presents an efficient home energy management system (HEMS) for consumer appliance scheduling in the presence of an energy storage system and photovoltaic generation with the intention to reduce the energy consumption cost determined by the service provider. To study the benefits of a home-to-grid (H2G) energy exchange in HEMS, photovoltaic generation is stochastically modelled by considering an energy storage system. The prime consideration of this paper is to propose a hybrid optimization approach based on heuristic techniques, grey wolf optimization, and a genetic algorithm termed a hybrid grey wolf genetic algorithm to model HEMS for residential consumers with the objectives to reduce energy consumption cost and the peak-to-average ratio. The effectiveness of the proposed scheme is validated through simulations performed for a residential consumer with several domestic appliances and their scheduling preferences by considering real-time pricing and critical peak-pricing tariff signals. Results related to the reduction in the peak-to-average ratio and energy cost demonstrate that the proposed hybrid optimization technique performs well in comparison with different meta-heuristic techniques available in the literature. The findings of the proposed methodology can further be used to calculate the impact of different demand response signals on the operation and reliability of a power system.
关键词： energy storage system,home-to-grid energy exchange,hybrid grey wolf genetic algorithm,home energy management system,photovoltaic generation and smart grid
更新于2025-09-12 10:27:22
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Coordinated optimal dispatch of photovoltaic units with updated power electronic transformer
摘要： The stochastic variation of photovoltaic (PV) generation units in the distribution grid has increased complexity of the optimal dispatch. Updated power electronics devices such as power electronics transformer (PET) are installed to improve the energy efficiency of DC power appliances and the control flexibility. The synergy effects of optimal dispatch of photovoltaic units and updated PET operation are analyzed in this paper. A two-stage optimization model is established to search for the best configuration and operation of distribution grid with updated PET feeders and photovoltaic inverters. The optimal configuration of PETs is given in the upper stage and given to the lower stage as input parameters to regulate the active and reactive power of photovoltaic inverters associated with operation of feeders updated with PETs. The coordinated optimization between updated PETs and photovoltaic generation units is developed to minimize the operation cost and total power losses in the distribution grid. NSGA-II algorithm is adopted to solve the proposed multi-objective optimization with constraints from both reliable operation of power system and power electronics devices. Comparisons between the simulation results with and without the proposed coordinated optimization for PETs and PVs valid the effectiveness of two-stage optimization model. The operation cost and power losses are reduced while avoiding the power curtailment of PV units by optimally configuring and regulating the power electronic devices including the PETs and inverters of PVs in the test distribution network.
关键词： multi-objective optimization,integration of photovoltaic generation,power electronic transformer,coordinated optimal dispatch
更新于2025-09-12 10:27:22
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Inspection of the effect of the crow deterrent system using camera system for long-term monitoring of bird flight trajectories at photovoltaic power plant
摘要： We put effect inspection of a crow deterrent system with alarm sound using crow observation system at photovoltaic power plant.This number of an area concerned in a photovoltaic generation plant could get the few effect by the alarm sound this crow deterrent system takes out of this inspection result.
关键词： Observation area,Photovoltaic generation plant,Crow observation system,Crow deterrent system,Crow
更新于2025-09-12 10:27:22
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Estimation of photovoltaic generation forecasting models using limited information
摘要： This work deals with the problem of estimating a photovoltaic generation forecasting model in scenarios where measurements of meteorological variables (i.e., solar irradiance and temperature) at the plant site are not available. A novel algorithm for the estimation of the parameters of the well-known PVUSA model of a photovoltaic plant is proposed. Such a method is characterized by a low computational complexity, and efficiently exploits only power generation measurements, a theoretical clear-sky irradiance model, and temperature forecasts provided by a meteorological service. The proposed method is validated on real data.
关键词： Model fitting,Photovoltaic generation,Energy systems,Forecasting
更新于2025-09-12 10:27:22