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A New Approach to Suppress DC-link Voltage Oscillations for a Grid Connected Photovoltaic System
摘要： A ?xed size perturbation in a Maximum Power Point Tracking (MPPT) algorithm yields excessive oscillations of operating point around the MPP and thus causes ?uctuations in the dc link voltage and ?ickers in the injected grid current. In this paper, we propose a new adaptive P&O MPPT by employing a Proportion-Integral (PI) controller to generate variable perturbations which eliminates the steady state error and yields faster settling time in the MPP tracking response. A comparative analysis is made using simulations in MATLAB/ Simulink ?rst then experimental studies on a prototype of grid connected PV system (GCPVS) is pursued. The obtained results are analyzed and it is found that the adaptive MPPT e?ectively reduces the dc-link voltage oscillations and injected grid current ?ickering.
关键词： Adaptive Perturb & Observe,Photovoltaic System,Maximum Power Point Tracking,Grid Integration
更新于2025-09-12 10:27:22
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Techno‐economic assessment of solar photovoltaic integration into national grids: A case study of Burkina Faso
摘要： To promote a low‐carbon society, it is urgent to better integrate renewable energies into energy supply systems. This paper examines the impact of solar photovoltaic (PV) integration into the national electrical grid in Burkina Faso on the electricity production cost. The analysis is based on the levelized cost of electricity (LCOE) technique. Several levels of PV integration have been considered namely 20%, 40%, 60%, and 80% of the total installed capacity. First, the results revealed all the configurations with PV integration are more attractive and cost‐effective compared with the conventional diesel standalone electricity system. The sensitivity analysis shows that the configuration with 80% PV is the most attractive when compared to the other ones as it has the lowest LCOE and CO2 emissions compared with the other scenarios. This paper also shows that in the context of rising fuel prices and environmental concern, the electricity production based on diesel standalone system is not a viable solution for Burkina Faso at the moment. Finally, the results revealed that subsidies offered by the government of Burkina Faso to support the electricity production cost will be more effective for a system with PV integration. This paper gives detail highlights of solution for policymakers to make useful investment in solar energy and widen the access to electricity in Burkina Faso.
关键词： Burkina Faso,optimization,solar photovoltaic,levelized cost of electricity,diesel generator,grid integration
更新于2025-09-11 14:15:04
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Dispatch optimization of concentrating solar power with utility-scale photovoltaics
摘要： Concentrating solar power (CSP) tower technologies capture thermal radiation from the sun utilizing a field of solar-tracking heliostats. When paired with inexpensive thermal energy storage (TES), CSP technologies can dispatch electricity during peak-market-priced hours, day or night. The cost of utility-scale photovoltaic (PV) systems has dropped significantly in the last decade, resulting in inexpensive energy production during daylight hours. The hybridization of PV and CSP with TES systems has the potential to provide continuous and stable energy production at a lower cost than a PV or CSP system alone. Hybrid systems are gaining popularity in international markets as a means to increase renewable energy portfolios across the world. Historically, CSP-PV hybrid systems have been evaluated using either monthly averages of hourly PV production or scheduling algorithms that neglect the time-of-production value of electricity in the market. To more accurately evaluate a CSP-PV-battery hybrid design, we develop a profit-maximizing mixed-integer linear program (H) that determines a dispatch schedule for the individual sub-systems with a sub-hourly time fidelity. We present the mathematical formulation of such a model and show that it is computationally expensive to solve. To improve model tractability and reduce solution times, we offer techniques that: (1) reduce the problem size, (2) tighten the linear programming relaxation of (H) via reformulation and the introduction of cuts, and (3) implement an optimization-based heuristic (that can yield initial feasible solutions for (H) and, at any rate, yields near-optimal solutions). Applying these solution techniques results in a 79% improvement in solve time, on average, for our 48-h instances of (H); corresponding solution times for an annual model run decrease by as much as 93%, where such a run consists of solving 365 instances of (H), retaining only the first 24 h’ worth of the solution, and sliding the time window forward 24 h. We present annual system metrics for two locations and two markets that inform design practices for hybrid systems and lay the groundwork for a more exhaustive policy analysis. A comparison of alternative hybrid systems to the CSP-only system demonstrates that hybrid models can almost double capacity factors while resulting in a 30% improvement related to various economic metrics.
关键词： Grid integration,CSP-PV hybrid systems,Mixed-integer linear programming (MILP),System analysis,Photovoltaics (PV),Concentrating solar power (CSP),Dispatch optimization,Lithium-ion battery
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Industry Applications Society Annual Meeting - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Industry Applications Society Annual Meeting - A New Magnetic Linked Active Neutral Point Clamp Converter for Transformer-less Direct Grid Integration of Solar Photovoltaic Systems
摘要： The multilevel inverters are becoming increasingly popular for use in the grid integration of wind and photovoltaic (PV) power plants due to their higher voltage handling capability and the better output power quality. There are several types of multilevel inverters that have been proposed in the literature; among them the active neutral point clamp (ANPC) multilevel inverters have been drawing significant attention specially for reducing unequal loss distribution. However, with the increase of number of levels, the ANPC requires more electronic switches and flying capacitors, by which the complexity and the cost increases. In this paper, a reduced number of switch and flying capacitor ANPC inverter is presented for the grid integration of the solar PV systems. Moreover, the proposed power converter effectively utilizes the dc bus voltage compared with the traditional ANPC converter. In the proposed inverter, a high frequency transformer is used to eliminate the voltage balancing problems faced by the traditional ANPC inverters. The proposed magnetic linked power converter provides the galvanic isolation, which is one of the most critical issues for traditional transformer-less grid connected PV systems. The proposed topology makes the control strategy simple and makes the power conversion system reliable for the photovoltaic power plants.
关键词： grid integration,inverter,ANPC,loss distribution,solar photovoltaic
更新于2025-09-11 14:15:04