REE&PQJ-25. ISSN: 3020-531X Index
Renewable Energies, Environment & Power Quality Journal (REE&PQJ)
Volume 26, Issue 2, July 2026-> Go to (Issue 3)
If you want to see the articles published by RE&PQJ until 2023, click here.
135-140
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254 |
Detailed Simulation and Loss Estimation of Active-Clamped ZVS Current-Fed Full-Bridge Isolated DC/DC Converter Abstract Estimating losses and efficiency of power electronic converters requires accurate simulation models of all components. Detailed computer simulation involves determining inductor currents and capacitor voltages using a solver for ordinary differential equations. However, solvers do not work well if the system is complicated and has very small time constants caused by snubber circuits..... READ MORE
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141-146
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257 |
Enhanced distance-protection algorithm for accurate fault location and resistance characterization under double phase-to-ground conditions Abstract The distance-protection function is employed tosafeguard high-voltage transmission lines against single-phase, double-phase, double phase-to-ground, and three-phase faults. In radial systems, or in double-end-fed configurations with homogeneous networks where the line is protected from the strong source end, the accuracy of conventional distance protection methods is inherently constrained. .... READ MORE
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147-152
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258 |
On the Formulas Used To Determine Fair Weather Corona Losses in Transmission Line Conductors Abstract Corona losses reduce transmission efficiency whilegenerating environmental noise and signal interference. Furthermore, the associated chemical discharges accelerate component aging, increasing operational and maintenance costs. This paper assesses the accuracy of prevalent corona loss formulas for overhead transmission lines under fair-weather conditions, the dominant weather condition for most power networks. .... READ MORE
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153-158
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262 |
Day-Ahead Price Arbitrage for Chebren Pumped Storage Hydropower Using Mixed-Integer Linear Programming Abstract Pumped-storage hydropower provides large-scale flexibility by shifting energy from low- to high-price hours. This paper evaluates the day-ahead arbitrage potential of the Chebren pumped-storage concept using a daily mixed-integer linear programming (MILP) scheduling model implemented in MATLAB and driven by hourly HUPX day-ahead prices for 2025. The model captures key operational constraints, including generating and pumping power limits, turbine and pump efficiencies, storage-energy bounds, mutually exclusive operating modes, and daily caps on pumping and generating hours..... READ MORE
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159-164
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263 |
Automated Time-Domain Detection and Characterization of Supraharmonic Impulsive Emissions Abstract Power‑electronics‑based devices inject conducted impulsive disturbances into low‑voltage grids, which can interfere with grid operation, connected devices, and power line communications. This work presents a methodology for the automated measurement and characterization of unwanted high‑amplitude impulsive disturbances. First, the paper proposes a set of algorithms for the automatic acquisition of voltage measurements of conducted emissions. The algorithms controls a commercial oscilloscope, processes the raw voltage data, detects high‑amplitude impulsive disturbances, and stores those sporadic emissions to optimize storage resources... READ MORE
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165-168
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264 |
Influence of the Gap Distance on the Repetition Rate and Apparent Discharge Power in Corona Discharges Abstract Testing for corona discharges is a major step in design and development of high-voltage equipment. Apparent discharge power is considered an important indicator of insulation stress, as it relates to discharge magnitude and pulse repetition rate. This study investigates the effect of gap distance, applied voltage and electrode geometry on apparent discharge power, based on the principles of IEC 60270. .... READ MORE
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169-174
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265 |
Modelling the Temperature-Dependent AC Resistance of Two-Layer Steel-Core Conductors for DLR Applications Abstract Steel-cored conductors, and specifically aluminum conductors steel-reinforced (ACSR), are widely applied in overhead power lines. However, because of the magnetization of the steel core, such conductors exhibit a non-linear electrical behavior, and their electrical resistance depends on the intensity of the current flowing through the conductor. This paper analyzes the alternating current (AC) resistance of two-layer ACSR conductors. .... READ MORE
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175-179
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267 |
Assessment of Dynamic Line Rating for Transmission Planning in the Costa Rican Power System Abstract The continuous growth of electricity demand driven by electrification and the increasing penetration of renewable energy sources pose significant challenges for transmission system planning. In Costa Rica, where electricity generation is largely sourced from renewable resources, conservative planning criteria based on Static Line Rating (SLR) may lead to an underutilisation of existing transmission infrastructure. ... READ MORE
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180-185
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268 |
Detection of Cyber-Attacks on Grid-Connected Converter with Output LCL Filter Abstract This paper presents the implementation of a cyber-attack detection system based on a watermarking strategy for a grid-connected power electronic converter equipped with an LCL filter. Mathematical models of the system are established to derive the detection equations. The proposed strategy was verified through both Matlab/Simulink simulations and laboratory experiments using a dSPACE-based control platform. .... READ MORE
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186-191
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270 |
Leakage-Safe Evaluation for Day-Ahead Load Forecasting Under an Operational Data Gap Constraint based on a Minimal Information Set Abstract End-to-end pipelines with data leakage can mislead model selection in day-ahead load forecasting. When training and evaluation inadvertently violate the information set available at issuance time, performance estimates cease to be decision-relevant. We quantify this effect by contrasting a leakage-safe (deployment-like) protocol against common leaky evaluation pitfalls for three base learners: Ridge regression, Light Gradient Boosting Machine (LightGBM), and a Long Short-Term Memory (LSTM) network. .... READ MORE
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192-196
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272 |
A new Double-Layer Photovoltaic Installation: Illustration of the basic Idea and first Performance Tests Abstract Conventional photovoltaic (PV) installations cause excessive land-use, even when built by using last-generation PV cell (and PV module) technologies. On the basis of an Italian patent (issued in 2025) and an international patent application, this study presents the new idea of a dynamic double-layer PV installation. It consists of two distinct and overlapping PV generation layers, where each layer can be (or not) equipped with independent solar tracking systems. ... READ MORE
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197-202
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273 |
NSGA-II Optimization Framework for Multi-Criteria Individual Pitch Control Design in Floating Offshore Wind Turbines Abstract The effective implementation of Individual PitchControl (IPC) is crucial for mitigating structural loads and platform motions in floating offshore wind turbines (FOWTs), yet the tuning of its controller parameters presents a complex multi-objective challenge. This study proposes a systematic optimization framework to address this issue. A multi-objective optimization problem is formulated with the goal of simultaneously minimizing blade root fatigue loads, power fluctuations, and pitch actuator duty..... READ MORE
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203-208
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277 |
Impact of Different Soiling Materials on Key Electrical Parameters of Photovoltaic Panels: An Experimental Analysis Abstract Photovoltaic solar energy is currently one of the fastest-growing renewable energy sources and is expected to play a key role in enhancing resilience against climate change by contributing to global electricity generation. However, like any energy system, photovoltaic (PV) installations are subject to disturbances that can degrade their performance over their operational lifetime. .... READ MORE
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209-215
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283 |
Travelling-Wave Strategy to Distance Protection for Fast Fault Location Abstract Conventional protection systems rely on phasor representations that assume near-steady conditions over a power-frequency cycle, an assumption increasingly fragile under rapidly changing operating environments. These methods typically require at least one cycle to issue a trip, limiting their speed and potentially compromising system stability, particularly in networks with significant inverter-based resources and reduced inertia..... READ MORE
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216-222
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284 |
A Time-Domain Incremental Approach to Distance Protection for Networks with High IBR Penetration Abstract Currently conventional protection relays may operate unreliably under the reduced inertia conditions and high levels of inverter based resources that characterise modern power systems. The literature consistently shows that existing algorithms and protection systems exhibit vulnerabilities: inappropriate tripping, causing unnecessary interruptions in energy delivery, or undetected faults due to the inherent limitations of traditional relay logic and the limited suitability of phasor-based estimation for representing fast, non-sinusoidal transient behaviour. .... READ MORE
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223-230
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286 |
Assessment of Local Photovoltaic Inverter Control Strategies for Voltage Regulation in Low-Voltage Distribution Networks Abstract The increasing penetration of photovoltaic (PV) systems and electric vehicles in low-voltage distribution networks (LVDNs) has intensified voltage regulation challenges due to bidirectional power flows and limited network flexibility. Conventional solutions based on infrastructure reinforcement or centralized control are often costly and complex to deploy. This paper analyzes a local voltage control strategy that exploits the inherent capabilities of PV inverters to provide voltage support in LVDNs with high PV penetration..... READ MORE
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231-236
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291 |
Line Protection in Power-Electronic-Dominated Networks Using the α-Plane: Analysis and Performance Evaluation Abstract This paper presents an evaluation of α-plane-based line differential protection when applied to power systems with high penetration of inverter-based resources (IBRs). A detailed electromagnetic transient model of the test system was developed in PSCAD/EMTDC. Fault scenarios considering different fault resistances and locations, fault types, and sampling frequencies were evaluated. The measured current signals were used as inputs to assess the performance of the α-plane-based line differential protection, considering both the non-adaptive and adaptive implementations.... READ MORE
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237-241
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295 |
Porosity Strategies to Optimize Temperature Distribution in Oil‑Directed Power Transformers Abstract Power transformers rely on efficient oil circulationto ensure adequate cooling of their active parts and to prevent excessive thermal stresses that may compromise insulation life. In forced oil-directed (OD) cooling regimes, the flow distribution through winding ducts and oil guides plays a critical role in controlling local temperatures. However, conventional oil guide designs may promote flow stagnation and recirculation zones, particularly in the regions immediately above the oil guides, leading to the formation of localized hot spots on upper winding discs..... READ MORE
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242-249
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298 |
Modeling Wind–Solar Complementarity under Heatwave Conditions: A Copula-Based Study for Southern Spain Abstract The increasing penetration of variable renewable energy sources has raised critical challenges for power system planning, particularly under extreme climatic conditions. In Southern Europe, heatwaves have become more frequent and intense, with the potential to alter the joint behavior of wind and solar power generation. This study investigates how heatwave conditions affect the dependence structure between wind and solar generation in the Andalusia region of Spain using a copula-based modeling framework. .... READ MORE
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250-257
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299 |
Economic–Operational Assessment of the Spanish Power Market: A Monthly TOPSIS Approach with Endogenous Weights Abstract The study examines how high levels of renewable penetration shape the economic and operational performance of the Spanish power system. It develops a monthly multicriteria index using the TOPSIS–CRITIC framework and evaluates two viewpoints. The demand perspective values tariff moderation and price stability, while the generator perspective focuses on value capture and revenue recovery. .... READ MORE
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258-263
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300 |
Fast-Simulation Methods for LCC-S Wireless Power Transfer Systems in Electric Vehicles Abstract The fast and iterative simulation of a large number of resonant power‑electronics circuit cases is essential for optimizing control variables or for the optimal sizing of passive components in Wireless Power Transfer Systems. Commonly used approximations, such as the first‑harmonic approximation, are useful for estimating certain electrical quantities, such as RMS current, phase or power, but they incur in significant errors in quantities that are more sensitive to distortion, such as switching current or peak values..... READ MORE
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264-269
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303 |
Optimizing battery energy storage systems simplified dispatch: comparatice analysis of temporal resolution, complexity and multi-market participation strategies Abstract Battery Energy Storage Systems (BESS) economicviability depends critically on accurate price forecasting for dispatch decisions. While existing literature extensively analyses BESS operation under perfect foresight, the impact of realistic forecast uncertainty remains insufficiently quantified. This paper develops a comprehensive framework to assess forecast-driven BESS operation using a rule-based dispatch model applied to three years of Iberian electricity market data (2020, 2022, 2024). .... READ MORE
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270-275
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306 |
Assessing the impact of price information on battery energy storage systems profitability: a rule-based dispatch analysis Abstract Battery Energy Storage Systems (BESS) economicviability depends critically on accurate price forecasting for dispatch decisions. While existing literature extensively analyses BESS operation under perfect foresight, the impact of realistic forecast uncertainty remains insufficiently quantified. This paper develops a comprehensive framework to assess forecast-driven BESS operation using a rule-based dispatch model applied to three years of Iberian electricity market data (2020, 2022, 2024)..... READ MORE
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