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[IEEE 2018 International conference on computation of power, energy, Information and Communication (ICCPEIC) - Chennai, India (2018.3.28-2018.3.29)] 2018 Internat2018 International Conference on Computation of Power, Energy, Information and Communication (ICCPEIC)ional conference on computation of power, energy, Information and Communication (ICCPEIC) - Grid Integration of PV System Using Synchronverter
摘要： All the power generators need to synchronize themselves with the grid before connection. The conventional method for frequency and phase matching is by using phase locked loops (PLL). But PLL being a nonlinear, complex device suffers several disadvantages. Solar photovoltaic (SPV) system converts solar energy directly into electrical energy. The output of SPV system depends on irradiance and temperature, due to which output power varies throughout the day. This continuous variation in power makes it difficult for the PLL to match the frequency with the grid. As the PV systems are static and hence lack inertia when there is an increased demand in load side. This may create problem of frequency instability when the penetration of renewable generating system is high. Hence, some external storage devices, such as batteries, are used to minimize these power fluctuations. The external storage devices add the installation as well as recurring cost of the generating system. Synchronverter is a 3 phase voltage source inverter (VSI), along with DC source, which mimics the behavior of Synchronous generator. A grid connected solar PV system using synchronverter, along with perturb and observe MPPT algorithm is designed and simulated in MATLAB software. The results show that the system is able to synchronize itself with grid without using PLL, both in standalone and grid connected mode. Also characteristics of synchronous generator such as frequency droop and voltage droop are exactly followed by our system. All the existing control strategies in power grid, which were earlier used to control synchronous generators, can be used to control the proposed SPV generator.
关键词： Grid,MPPT,Photovoltaic,Synchronverter,PLL
更新于2025-09-10 09:29:36
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[IEEE 2017 IEEE International Conference on Computational Intelligence and Computing Research (ICCIC) - Coimbatore, India (2017.12.14-2017.12.16)] 2017 IEEE International Conference on Computational Intelligence and Computing Research (ICCIC) - MATLAB / SIMULINK Simulation of PV System Based on MPPT in Variable Irradiance with EV Battery as Load
摘要： The PV panels have become a ubiquitous renewable resource as it produces clean energy and needs less maintenance. However, in changing environmental conditions less power output is generated. The operating point shifts from the maximum power point (MPP) to some other point. The MPP Tracking (MPPT) controller is designed for the panels to track the changing irradiance and maintain operating point at MPP. The MPPT controller uses an algorithm which generates a dynamic duty ratio for the dc-dc converter. MATLAB simulation of the MPPT PV system using perturb and observe (P&O) algorithm is shown in this paper. In the simulation model, irradiance changes are considered while the temperature remains unchanged. A comparison between non-MPPT and MPPT output is analysed. The result verifies that MPPT algorithm boosts the efficiency of the system in changing climatic conditions and performs better than the non-MPPT system.
关键词： dc-dc Converter,Perturb and Observe (P&O) algorithm,Photovoltaic (PV) Cells,Maximum Power Point Tracking (MPPT)
更新于2025-09-10 09:29:36
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Light-Harvesting CMOS Power-Supply System for 0–10-mW Wireless Microsensors
摘要： Wireless microsensors in consumer products, homes, hospitals, and factories incorporate sensing, processing, and transmission intelligence that can save money, energy, and lives. Although their tiny batteries deplete quickly, harvesting light energy can replenish what they supply. Still, a 1-mm2 PV cell can only generate up to 150 μW of the mW's that a wireless microsensor can consume. The battery-assisted light-powered harvester presented here therefore draws 10–130 μW from a 1 × 1-mm2 PV cell and assistance from a battery to supply a 10-mW load and recharge the battery with excess PV power. The CMOS system regulates its 1-V output within ±28 mV while supplying 10× more power per 1 mm3 with 94.5% efficiency and 38× with 87.8% efficiency than the best light-harvesting microsystem reported. Unlike others whose efficiencies peak at one power level, efficiency here is 94.5% across vPV's 10–130-μW and PLD's 0.5–10-mW with a 18-μH 3 × 3 × 1.5-mm3 inductor and 87.8% with a 22-μH 1.6 × 0.8 × 0.8-mm3 device.
关键词： Ambient light,switched-inductor converter,wireless microsensor,energy harvester,power supply,photovoltaic (PV) cell,CMOS microsystem,charger
更新于2025-09-10 09:29:36
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Robust 3IMPL Control Algorithm For Power Management of SyRG/PV/BES Based Distributed Islanded Microgrid
摘要： In an islanded AC microgrid, a comprehensive algorithm of three phase, improved magnitude, phase locked loop (3IMPL) control algorithm is developed to provide DC off set removal, steady state error removal and fast dynamic response. In addition, the control of the voltage source converter (VSC) using 3IMPL algorithm, provides voltage and frequency control and elimination of harmonics of nonlinear loads. In proposed microgrid, a solar PV array is connected to the DC link through a boost converter and an INC (Incremental Conductance) technique is used for extraction of maximum power from a PV array. Due to intermittency of PV array, a synchronous reluctance generator (SyRG) is used for pico-hydro generation because it is economical, ecologically sustainable, requires less maintenance and extremely reliable. Moreover, a microgrid suffers from problems of variation in generation and continuous load fluctuations, therefore for power balancing between the source and the load, a storage battery is connected across the DC link of VSC through a bidirectional DC-DC converter. Test results on a prototype have verified the control strategy and it is able to improve the power quality of the system at varying solar insolation and unbalance in loads.
关键词： SyRG (Synchronous Reluctance Generator),Bidirectional Converter,PV (Photovoltaic),Microgrid,Power Quality,Pico-Hydro Generation
更新于2025-09-10 09:29:36
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[IEEE 2017 International Renewable and Sustainable Energy Conference (IRSEC) - Tangier (2017.12.4-2017.12.7)] 2017 International Renewable and Sustainable Energy Conference (IRSEC) - Data Driven Model for Short Term PV Power Forecasting using Least Square Support Vector Regression
摘要： This paper presents an off-line model for forecasting photovoltaic power. This model is suitable to provide short-term forecasts without the need of Numerical Weather predictions data. This is interesting especially for power system operators as well as for individuals who do not have access to weather data and forecasts. In this paper we investigate the influence of an additional input parameter to the accuracy of an already tested and validated offline model. To rectify the performances of our models we will compare their performances with a usual persistent model. The results of simulation shows the benefits of adding this input to improve the accuracy of our PV forecasting model.
关键词： Photovoltaic Power,Forecasting,Least Square Support Vector Regression,Smart Grid,Grid Management,Machine Learning
更新于2025-09-10 09:29:36
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Multi-Party Energy Management and Economics of Integrated Energy Microgrid with PV/T and CHP system
摘要： Focusing on electricity and thermal energy requirement of contemporary buildings, a joint operation of photovoltaic thermal (PV/T) based prosumers and a Microturbine based combined heat and power (CHP) system has been presented to analyse the economics of grid-connected microgrid (MG) system. Bidirectional flow of electricity and heat model is considered and is optimally managed using price-based demand response (DR) scheme. Thermal storage is exploited to ward off the substantial amount of heat wastages that enhance the system's reliability during any disruption of microturbine. The objective functions of both prosumer and microgrid operator (MGO) are formulated as a profit maximization problem where they interact with each other on the basis of DR activity. To establish this strategic decision-making process, the system is modelled as a Stackelberg Equilibrium (SE) game, where MGO acts as a leader while PV/T prosumers act as a follower. The interaction or contribution of two players in a game is a problem of non-linear optimization which is solved by Differential Evolution (DE) algorithm. In the end, in a case study, it has been proved that the results are quite lucrative for the proposed model.
关键词： photovoltaic thermal (PV/T),Differential Evolution (DE),demand response (DR),Stackelberg Equilibrium (SE),microgrid (MG),combined heat and power (CHP)
更新于2025-09-10 09:29:36
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Grid Integrated Solar Energy Conversion System Using Super-Lift Converter
摘要： Grid integrated photovoltaic (PV) system is capable of maximizing solar energy conversion by minimizing power losses. Conventionally, the grid integrated PV system uses boost or buck-boost DC-DC converters in the DC link for lifting up the PV output. Also, a separate complex circuit is used for active power compensation in the grid end. This paper proposes an advanced DC-DC converter by name Super-Lift Converter (SLC) in the DC link of grid integrated PV system. Unlike the conventional DC-DC converters, the proposed converter lifts up the DC link voltage thrice that of the input voltage. In addition, the proposed SLC is regulated using a PI controlled active front end (AFE) topology, which results in operation of unity power factor at grid end. The suggested system is simulated using MATLAB software. The presented results such as grid end voltage and current, input and output power of SLC and DC link voltage validates the effectiveness of the developed system.
关键词： Voltage Ripple,Energy,DC-DC conversion,Photovoltaic,Active Front End
更新于2025-09-10 09:29:36
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<b>Impact of modified perturb and observe control on MPPT of PV/battery fed three - port DC‐DC converter
摘要： This paper presents the modified perturb and observe (P&O) maximum power point tracking (MPPT) method for photovoltaic (PV) fed three-port DC‐DC converter in PV/battery hybrid system. The proposed MPPT technique reduces the drift problem which occurs in the conventional MPPT methods by including the data of change in current (ΔI) in addition to the data used in the conventional P&O algorithm. The drift phenomenon and its effects are clearly demonstrated in this paper. The ability of the proposed P&O method to address this issue is proved by comparing the conventional P&O algorithm in different modes of operation. The performance assessment includes peak overshoot, settling time, MPP ratio and stability. The experimental validation was implemented using DSPIC30F4011 microcontroller. From the analysis and results, it could be seen that the modified P&O showed better performance in terms of accuracy in tracking the maximum power, less tracking time, high MPP ratio and reduced drift in the changing weather conditions.
关键词： DC‐DC power converters,current-voltage characteristics,photovoltaic systems,drift,power demand,pulse width modulation
更新于2025-09-10 09:29:36
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A hybrid intelligent GMPPT algorithm for partial shading PV system
摘要： Maximum power extraction for PV systems under partial shading conditions (PSCs) relies on the optimal global maximum power point tracking (GMPPT) method used. This paper proposes a novel maximum power point tracking (MPPT) control method for PV system with reduced steady-state oscillation based on improved particle swarm optimization (PSO) algorithm and variable step perturb and observe (P&O) method. Firstly, the grouping idea of shuffled frog leaping algorithm (SFLA) is introduced in the basic PSO algorithm (PSO–SFLA), ensuring the differences among particles and the searching of global extremum. Furthermore, adaptive speed factor is introduced into the improved PSO to improve the convergence of the PSO–SFLA under PSCs. And then, the variable step P&O (VSP&O) method is used to track the maximum power point (MPP) accurately with the change of environment. Finally, the superiority of the proposed method over the conventional P&O method and the standard PSO method in terms of tracking speed and steady-state oscillations is highlighted by simulation results under fast variable PSCs.
关键词： Variable step P&O (VSP&O),Global maximum power point tracking (GMPPT),Under partial shading conditions (PSCs),Particle swarm optimization (PSO),Photovoltaic (PV) system,Adaptive speed factor,Shuffled frog leaping algorithm (SFLA)
更新于2025-09-10 09:29:36
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Optical optimization of a multi-layer wideband anti-reflection coating using porous MgF2 for sub-micron-thick CIGS solar cells
摘要： The optical losses associated with sub-micron absorbers in CIGS solar cells can be reduced by light management techniques. 3-D optical modelling was used to optimize light in-coupling and internal rear reflectance in a 750-nm thick CIGS reference solar cell. At the front side, an effective medium approximation (EMA) approach for describing optical properties of a MgF2-based anti-reflection coating (ARC) was applied. Taking reflectance as the cost function and sequential nonlinear programming as the optimization algorithm, an optimal porous-on-compact double-layer ARC was determined. This led to a wideband light in-coupling with a 6.8% improvement in the photo-current density (Jph) with respect to the reference solar cell without ARC. Considering the variation of the sunlight direction due to day and seasonal changes, different light incidence angles were investigated. The results indicate that in this case, our designed double-layer ARC outperforms the standard compact MgF2 single-layer ARC. By using the EMA approach, the amount of computational memory can be reduced by a factor of 30, shortening the simulation time from four days to one hour. At the rear side of the cell, a point-contacted MgF2/Al2O3 reflector, in combination with our proposed front ARC, enhances the Jph by 11.3% considering the same reference solar cell. Compared to a much thicker cell (1600-nm thick absorber) with no light management applied, our front-and-rear optical approaches more-than-compensate optical losses resulting from using thinner absorbers. This design is suitable for industrial uptake and practical to realize. Additionally, the approach of using EMA for double-layer ARC optimization is innovative with respect to other ARC approaches applicable to not only chalcopyrite photovoltaic technologies.
关键词： Thin films,Antireflection coatings,Light management,Photovoltaic
更新于2025-09-10 09:29:36