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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Aerial Infrared Thermography of a CdTe Utility-Scale PV Power Plant
摘要： Aerial Infrared Thermography (aIRT) is a fast and flexible inspection method to monitor and assess utility-scale photovoltaic (PV) power plants. The literature is abundant on aIRT for crystalline silicon (c-Si) modules, but very little investigation has been carried out and reported thin-film PV. As Cadmium Telluride (CdTe) is currently the leading thin-film technology, and a good performer in warm and sunny climates, this paper aims to investigate the application of aIRT on CdTe PV plants in Brazil. Results demonstrate that aIRT is a reliable, cost-effective and fast method to detect faults on CdTe modules in large-scale PV plants.
关键词： Fault Inspection,Unmanned Aerial Vehicles (UAV),Photovoltaic Power Plants,Aerial Infrared Thermography (aIRT),Thin-Film,Cadmium Telluride (CdTe)
更新于2025-09-23 15:21:01
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Performance Problem of Current Differential Protection of Lines Emanating from Photovoltaic Power Plants
摘要： The amplitude and phase angle of the fault current in photovoltaic power plants (PVPPs) are significantly influenced by the control system of the grid-connected inverters, unlike in a conventional synchronous source. Hence, PVPPs may adversely affect the performance of the current differential protection designed for synchronous sources-based power grids. In order to study the performance problem of current differential protection on AC transmission lines, an analytical expression of the fault current in the PVPPs was deduced, and the fault current characteristic was extensively analyzed. Based on this analysis, the ratio of differential current over restraint current was initially derived in this study; this ratio is observed to be affected by the control system parameters, power grid system parameters, fault resistance, and fault types. Moreover, the dynamic characteristics of this ratio can be clearly observed based on a three-dimensional diagram. Furthermore, the operating performance of the current differential protection was analyzed under different influencing factors. The mathematical analysis presents that the amplitude ratio of the fault current on both sides of the line is larger than nine and that current differential protection will operate reliably in any case. Meanwhile, the theoretical analysis and simulation results show that the current phase angle difference may become an obtuse angle in case of an ungrounded fault, which will cause inaccurate operation of the current differential protection. The results of this study will provide guidance for the engineering application of current differential protection in case the PVPPs are connected to a power grid.
关键词： performance problem,photovoltaic power plants,current differential protection,fault current behavior
更新于2025-09-23 15:19:57
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Frequency support from photovoltaic power plants using offline maximum power point tracking and variable droop control
摘要： With higher penetration of converter-connected renewable energy sources (RES) into power systems, the successful operation of the system is challenged by significant reductions in system inertia. Presently, given the dominant share of the conventional synchronous power plant, RES power plants are not demanded to provide ancillary services. However, as RES connections increase, RES power plants will play a major role in power system operation, contributing to frequency control. This study demonstrates that photovoltaic power plants (PVPPs) can provide effectively different types of frequency support based on a power reserve and an offline maximum power point tracking (MPPT) technique. An innovative method to de-load the PVPP without significantly increasing the MPPT complexity is proposed. Results from different PVPP frequency support methods, under varying levels of photovoltaic penetration, are presented which demonstrate their capability to provide inertia support comparable to that of synchronous generators. A new variable droop control method, which releases maximum power during the inertial response and returns to fixed droop gain value after a specified time is also presented. The results from using the variable droop show that the frequency nadir and the rate-of-change-of-frequency can be significantly reduced and some power reserve still maintained after a frequency event.
关键词： variable droop control,offline maximum power point tracking,photovoltaic power plants,system inertia,frequency support,renewable energy sources
更新于2025-09-19 17:13:59
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Key Parameter Identification and Optimization of Photovoltaic Power Plants Based on Genetic Algorithm
摘要： As the penetration rate of the photovoltaic power continues to grow, its impact on the stability of the power system becomes more considerable ever than before. However, due to the relatively low accuracy of the parameters, the traditional electromagnetic transient simulation used to assess the impact is biased. Therefore, it is of great importance to perform key parameter identification and optimization on a solar power plant containing many photovoltaic panels, which can avoid the problem of combination explosion. In this paper, a scheme of key parameter identification is proposed. Then, an optimization method based on genetic algorithm is also established to improve the accuracy. Simulation tests validate the effectiveness of the proposed method.
关键词： genetic algorithm,parameter identification,photovoltaic power plants,optimization
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Synchronous Frequency Support of Photovoltaic Power Plants with Inertia Emulation
摘要： Grid stability is one of the main concerns in renewable energies. The lack of inertia and their low capability to provide frequency support has created the need for implementing new control strategies to solve this problem. In current networks, frequency and voltage support are performed through synchronous generators, which provide an inherent grid support due to the inertia presented in their mechanical rotors. Based on the same concept, renewable energies based on power converters have introduced synchronous controllers to emulate the dynamic behavior of synchronous generators and provide voltage and frequency support. However, most synchronous control strategies integrate their controllers as an add-on firmware embedded in each power converter, without presenting a coordinated synchronous performance when several converters operate in a PV power plant. The aggregation of several power converters operating with a coordinated synchronous response would be advantageous in these cases, since they can provide a harmonic response with an automatic power distribution when grid support is required. This paper presents a synchronous control strategy for photovoltaic power plants, which manages several power converters as an aggregated synchronous system.
关键词： Grid frequency support,Photovoltaic Power Plants,Synchronous Power Control
更新于2025-09-12 10:27:22
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Numerical Study on Windbreaks with Different Porosity in Photovoltaic Power Plants
摘要： In recent years, more and more attention has been paid to clean energy. Large-scale photovoltaic power plants are increasing. Photovoltaic power generation will be destroyed at a high wind speed, affecting the efficiency of power generation. Based on the computational fluid dynamics technology and the use of porous media model, this paper uses Fluent to numerically analyze the windbreaks of photovoltaic power generation. The influence of the inlet wind speed and the porosity of the windbreaks on the differential pressure across the photovoltaic panels was studied. The results show that with the increase of wind speed, the differential pressure of the photovoltaic panel is also increasing; installing the windbreaks with a porosity of 0, the differential pressure of the PV panel decreases. In addition, the pressure drop of the photovoltaic panel can be reduced by 50%-68% due to the effect of the windbreaks at different wind speeds; the porosity of the windbreaks panel is the better at 0.25-0.5, compared with the windbreaks without installation, the differential pressure of the photovoltaic support bracket decreased by 18.75%-35.84%.
关键词： Porosity,Photovoltaic power plants,Windbreaks,Numerical analysis
更新于2025-09-12 10:27:22