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Optimum capacity of the inverters in concentrator photovoltaic power plants with emphasis on shading impact
摘要： Nowadays, there is wide experience on selecting an adequate ratio between the photovoltaic array peak power and the inverter capacity for conventional photovoltaic systems. However, when dealing with concentrator photovoltaic plants, the problem is more complex and the results obtained with conventional methods are not directly applicable. There are few studies regarding concentrator photovoltaic technology and all of them neglect the impact of shading. In this paper, based on the experimental characterisation of a typical concentrator photovoltaic module, a power plant model is developed, which takes into consideration shading, module misalignment, and different inverter con?guration schemes for optimising the inverter capacity. The inverter size is analysed for different ground cover ratios (from 12% to 52%), inverter schemes (micro-, string-, and tracker-inverters), inverter ef?ciencies (low-, medium-, and high-ef?ciency), climatic conditions (Granada, Marrakech, and Frenchman Flat), and economic conditions (system cost excluding inverters from 850 to 1400 V/kWp). Results show values for the DC-to-AC sizing ratio ranging from 1.01 to 1.67 (maximum performance ratio), and from 1.53 to 1.79 (minimum levelised cost of energy). String-inverters exhibit the best behaviour in terms of levelised cost of energy, except in shadow-free systems, in which tracker-inverters behave better.
关键词： Inverter size,Concentrator photovoltaics,Levelised cost of energy,Ef?ciency improvement,Shading,Inverter con?guration
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) - Design of Common and Differential Mode Filters for Single-Phase Full-Bridge Photovoltaic Inverters
摘要： Photovoltaic arrays have high parasitic capacitance between positive/negative poles and earth. Therefore, conventional single-phase full bridge inverters with unipolar modulation are not suitable for applications in photovoltaic inverters because they have leakage currents higher than the limits acceptable by the standards. Additionally, high common mode currents tend to result in electromagnetic noise of significant magnitude. This paper proposes an integrated methodology for common and differential mode filter design for single phase full-bridge photovoltaic topology with a LCL filter. The differential mode filter is designed to meet the constraints of harmonic current distortion, while the common mode filter is designed to suit the ripple of common mode current and the filter quality factor to the design constraints. Simulation results show that the proposed methodology is simple and effective.
关键词： Photovoltaic inverter,Full-Bridge inverter,Differential mode filter,LCL filter,Common-mode filter
更新于2025-09-16 10:30:52
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[IEEE 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Xi'an, China (2019.6.19-2019.6.21)] 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Analysis and Design of a Novel Transformer-less-Inverter in Grid-Connected Photovoltaic System
摘要： The continuous urge for improvement in our standard of living has increased the consumption of electrical energy by leaps and bounds. This hike in energy consumption, draining of fossil fuels and degrading global environment has led to invention of green power generation systems. Thus, the global demand for renewable resources has led to flourishing of photovoltaic (PV) market. The enabling technology in the PV systems is the inverter, which could be either: 1) with transformer isolated or 2) without transformer non-isolated (transformer-less inverter). Recently, single phase transformer- less voltage source inverters (VSI) have been extensively used for distributed photovoltaic grid tied systems. The objective of this paper is to review a few notable topologies and propose a new topology for transformer-less photovoltaic inverter. The analysis and design of the proposed topology is verified by simulating it on PSIM. Furthermore, the simulation results are validated by testing a proof-of-concept laboratory hardware prototype rated at 250 W.
关键词： Photovoltaic (PV) systems,transformer-less,single phase inverter
更新于2025-09-16 10:30:52
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Computation and Communication Technologies || Implementation of Multilevel Z-Source Inverter using Solar Photovoltaic Energy system for Hybrid Electric Vehicles
摘要： This paper extends a topology for cascaded multilevel Z source inverter employs of z source inverter unit block with bidirectional switches. The conventional z source inverter consist network impedance with multiple indictors and capacitors arranged Z type topology performs either buck or boost the input voltage for non linear load depending upon duty ratio and modulation index in a multiple stage conversion with the help of impedance source passive network (L and C Z source inverter reduces harmonic distortion and overcomes limitations of conventional inverters. The proposed multilevel Z source inverter reduces harmonics further and provides a novel topology for power conversion. Capability of proposed configuration in producing all odd and even output voltage level source with input to the power source and increase the power efficiency is proved by simulation result for 3-level inverter. The output of the proposed system is simulated using MATLAB-SIMULINK and implemented in real simulation hardware for electric vehicles using dSPIC controller.
关键词： MATLAB,dSPIC,multilevel z-source inverter,ZSI,total harmonic distortion
更新于2025-09-16 10:30:52
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Resonance Instability of Photovoltaic E-Bike Charging Stations: Control Parameters Analysis, Modeling and Experiment
摘要： This article presents an in-situ comparative analysis and power quality tests of a newly developed photovoltaic charging system for e-bikes. The various control methods of the inverter are modeled and a single-phase grid-connected inverter is tested under different conditions. Models are constituted for two current control methods; the proportional resonance and the synchronous rotating frames. In order to determine the influence of the control parameters, the system is analyzed analytically in the time domain as well as in the frequency domain by simulation. The tests indicated the resonance instability of the photovoltaic inverter. The passivity impedance-based stability criterion is applied in order to analyze the phenomenon of resonance instability. In conclusion, the phase-locked loop (PLL) bandwidth and control parameters of the current loop have a major effect on the output admittance of the inverter, which should be adjusted to make the system stable.
关键词： grid-connected inverter,photovoltaic,solar mobility,resonance instability,power quality,solar charging
更新于2025-09-16 10:30:52
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A Zero-Voltage-Transition H5-Type Transformerless Photovoltaic Grid-Connected Inverter
摘要： Efficiency and leakage current are two major issues for transformerless grid-connected inverters (TLI). Soft-switching technologies can reduce switching losses and be applied in TLIs. Herein, a zero-voltage-transition H5 type (ZVT-H5) inverter with soft turn-on and turn-off transitions of high-frequency main switches is derived from basic resonant tanks. Compared with the hard-switching H5 (HS-H5) inverter, the conversion efficiency of ZVT-H5 is significantly improved. Moreover, the reverse recovery problem of freewheeling diodes is alleviated under the operation of the auxiliary resonant network. Meanwhile, a diode clamping branch is employed to achieve constant common-mode characteristic for the ZVT-H5. The construction process of the proposed topology is described, and the operation principle of the auxiliary resonant network is analyzed. Moreover, the resonant parameter design of ZVT-H5 and its circuit performance are discussed in detail. Finally, the experimental results of a 3-kW prototype at 100 kHz switching frequency are provided to verify the effectiveness of the ZVT-H5.
关键词： Grid-connected inverter,Resonant tank,Transformerless,Zero-voltage-transition (ZVT)
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) - Bucharest, Romania (2019.9.29-2019.10.2)] 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) - Experimental Research on the Response Time of Three-Phase Inverter on Grid Coupled to Photovoltaic Panels
摘要： The purpose of this paper is to study the response time of SMA Sunny Tripower 5.5 inverters. Material and method: The photovoltaic polycrystalline photovoltaic panels totaling 5000 W, which directly feeds an STP 500TL-20- 5.5kW Sunny Tripower grid inverter. Experimental research was conducted to test the possibility of using these inverters designed for solar systems coupled with wind turbines. As MPPT (maximum power point traking) inverters used for the above purpose, and delivering voltage to the national grid, they have an operating algorithm that allows them to adapt the impedance so that the group of photovoltaic panels delivers maximum power, indifferent to and the angle of incidence of the solar panels. The maximum voltage at which the panels work is 1000V, which allows the insertion of a large number of panels on the same string (virtually 1000/42 = 24 monocrystalline panels or 1000/37 = 27 polycrystalline panels). The algorithm mentioned above probes the power curve at various impedances, and then positions itself on the impedance at which the calculated power was the maximum. After a while, the process is resumed, since it is possible that the power received by the Sun panels has changed.The same algorithm is also respected by wind turbine inverters, with the observation that the sweep of the power curve and the positioning to the maximum value takes much less. This is necessary because the value of the wind speed is much faster than the sun. In addition, the safety of the turbine requires this, as it could lead to a wind turbulence. In conclusion, SMA Sunnny Tripower inverters are very slow in terms of loading and calculating the optimal operating point.
关键词： sampling rate,inverter,response time,on grid,data,photovoltaic pannel
更新于2025-09-16 10:30:52
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AIP Conference Proceedings [AIP Publishing RENEWABLE ENERGY SOURCES AND TECHNOLOGIES - Tamil Nadu, India (14–15 March 2019)] RENEWABLE ENERGY SOURCES AND TECHNOLOGIES - Design and simulation of developed embedded Z-source inverter for photovoltaic interface
摘要： This paper presents the implementation of Embedded Switched Z Source Inverter (ES-ZSI) using photovoltaic interface. Lesser passive elements are required in ES-ZSI with reference to the conventional Z-source inverter. Buck boost operation can be simulated in ES-ZSI, and it is interfaced with PV module. The shorting of the inverter leg is resolved adding to the high output voltage gain of the inverter. Various modes of operation are evaluated and their results are simulated using MatLab. Eventually, simulation study of the complete system is presented for both buck and boost state in ES-ZSI and their results are validated experimentally.
关键词： MatLab,PV module,Embedded switched Z-source inverter
更新于2025-09-16 10:30:52
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Single-phase photovoltaic grid-connected inverter for predictive control method with power feed-forward
摘要： In the traditional photovoltaic grid-connected inverter control, there are problems such as slow system response speed, low stability and grid-connected current distortion. In this regard, a novel current prediction control method for grid-connected inverter with power feed-forward is proposed. The method consists of DC voltage outer loop control, current predictive control, power feed-forward and grid voltage feed-forward. The characteristic is that the current prediction control algorithm derived from the state equation of the grid-connected inverter effectively suppresses the influence of DC voltage fluctuation on the grid-connected current and enhances the robustness of the system; the introduction of power feed-forward accelerates the dynamic response of the system; The introduction of grid voltage feed-forward reduces voltage distortion or current distortion. And the traditional PI control module is not needed, the structure is simple, and the circuit is easy to implement. Matlab/Simulink simulation model and experimental results prove the effectiveness of the proposed control method, which is more practical than the traditional double loop control method.
关键词： predictive control,power feed-forward,photovoltaic grid-connected inverter,grid voltage feed-forward,current prediction control
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Chengdu, China (2019.5.21-2019.5.24)] 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Modeling and Simulation of Virtual Synchronous Generator for Photovoltaic Inverter
摘要： The rise of photovoltaic installed capacity brings severe challenges to the safe and stable operation of the power grid. If the grid-connected inverter of the photovoltaic system can simulate the moment of inertia and frequency modulation characteristics of the synchronous generator according to external characteristics, the stability of the photovoltaic system can be improved. Therefore, the virtual synchronous generator control strategy (VSG) is proposed. This paper builds a generic simulation model of current source type photovoltaic inverter based on VSG technology, which can simulate a series of VSG behaviours including virtual inertia control, damping control, primary frequency control, reactive power control and fault ride through. The developed simulation model is also validated comparing to the actual PV power plant testing data, which shows accurate and reliable simulation results. The model of photovoltaic inverter can provide theoretical and model basis for the study of grid-connected stability and grid-connected operational characteristics.
关键词： VSG,photovoltaic inverter,Damping control,Droop control,Microgrid
更新于2025-09-16 10:30:52