Article
Green & Sustainable Science & Technology
Xinyu Wu, Yiyang Wu, Xilong Cheng, Chuntian Cheng, Zehong Li, Yongqi Wu
Summary: Optimizing hydro unit commitment has the potential to improve water use efficiency, but it is necessary to consider complex constraints from power grid, hydropower station, and unit operation. To overcome the problem of conflicting constraints leading to no feasible solution, a constraint grading principle is proposed to convert hard constraints into soft constraints and rank them in priority levels. The proposed method effectively solves the problem of no feasible solution due to conflicting constraints in HUC.
Article
Energy & Fuels
Longfei Wei, Guangyi Liu, Shen Yan, Renchang Dai, Yachen Tang
Summary: This paper introduces a graph computing-based framework for solving the security-constrained unit commitment problem in hydro-thermal power systems incorporating pumped hydro storage, considering economic and technical impacts. It formulates a MIP model with mathematical models of thermal units, cascade hydropower stations, and PHS stations, and introduces optimization methods for faster computation. Case studies on real power systems demonstrate the feasibility and validity of this framework.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2021)
Article
Thermodynamics
Xianliang Cheng, Suzhen Feng, Hao Zheng, Jinwen Wang, Shuangquan Liu
Summary: In this study, a hierarchical modeling strategy is used to solve the short-term hydro scheduling problem by decoupling it into load distribution and unit commitment sub-problems. Mixed Integer Linear Programming is employed to solve both sub-problems, and the coordination is achieved through coupling variables. The linearity errors in the model are eliminated with a successive water head updating procedure. The optimal quarter-hourly schedule for the Lancang Cascade is obtained in a short time, considering hydraulic connection, unit operating zones, head-dependency, generation, and water level targets.
Article
Energy & Fuels
Zhuangzhuang Li, Ping Yang, Yi Yang, Guanpeng Lu, Yufeng Tang
Summary: This paper proposes a stochastic hydro unit commitment model to maximize the total revenue of a hydropower producer in a liberalized market. The model takes into account the uncertainty of market prices using a scenario tree and solves the problem efficiently using Benders Decomposition and Modified Stochastic Dual Dynamic Programming.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Dominik Putz, Daniel Schwabeneder, Hans Auer, Bernadette Fina
Summary: This paper addresses the Unit Commitment problem in power supply systems by using mixed-integer linear programming and backward dynamic programming. By enhancing the dynamic programming algorithm with state prediction, the proposed formulation significantly reduces computation time and delivers satisfactory solutions in a shorter time compared to other approaches. Additionally, the linear dependence of computation time on the number of steps is a key advantage of the dynamic programming strategy, especially for longer planning horizons.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Ignacio Guisandez, Juan Ignacio Perez-Diaz
Summary: The study compares five mixed integer linear programming formulations for modeling the hydro production function, discussing their accuracy, effectiveness, and speed in solving hydro scheduling problems to help make the most appropriate choice depending on the time horizon. The logarithmic independent branching 6-stencil method is identified as one of the most accurate, the parallelogram method as one of the most effective, and the traditional method based on a single concave piecewise linear flow-power function as the fastest one.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Mahdi Nozarian, Hossein Seifi, Mohamad Kazem Sheikh-El-Eslami, Hamed Delkhosh
Summary: This paper formulates the HTUC problem as a MILP model, taking into account the models of both hydro and thermal units. It also introduces the concept of DR to regulate the energy market, and the simulation results show the effectiveness of the proposed method.
ELECTRICAL ENGINEERING
(2023)
Article
Thermodynamics
Lu Lu, Wenlin Yuan, Chengguo Su, Peilin Wang, Chuntian Cheng, Denghua Yan, Zening Wu
Summary: Integrating wind and photovoltaic power into large hydropower plants is crucial for promoting renewable energy consumption in China. A novel coordination mode for a large-scale hybrid system was established, considering ecological flow demand for cascade hydropower plants. The coordinated operation improved profit and controllability of power output, with sensitivity analysis evaluating factors impacting system performance.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Electrical & Electronic
Sotirios Nanou, Georgios N. Psarros, Stavros A. Papathanassiou
Summary: This paper introduces a new network-constrained unit commitment model, formulated as a mixed-integer linear programming problem with embedded AC-PF constraints, which ensures the UC dispatch schedule within permissible transmission capacity and voltage deviation limits. The proposed model is tested on actual systems and validated against DIgSILENT/Powerfactory package, with detailed results compared to existing literature employing different UC+AC-PF models for the same test systems.
ELECTRIC POWER SYSTEMS RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
K. V. Santos, E. C. Finardi
Summary: In a centralized-based dispatch market, the NCHTUC determines generation decisions to minimize costs, with hydropower offering unique flexibility features. Simplifications on HPF modeling are necessary due to computational burden, with plant-based HPF piecewise linear approach being common.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Energy & Fuels
Mohamed Elsir, Ameena Saad Al-Sumaiti, Mohamed Shawky El Moursi, Ali Taleb Al-Awami
Summary: This paper presents a market-clearing mechanism in a co-optimization model that coordinates the operation of grid-connected reverse osmosis water desalination plants (RO-WDPs) and the operation of renewable-rich power systems. The simulation results show that the proposed coordinated model enhances system efficiency, facilitates renewable energy integration, and smoothes hourly electricity prices.
Article
Engineering, Electrical & Electronic
Maissa Daadaa, Sara Seguin, Kenjy Demeester, Miguel F. Anjos
Summary: This paper introduces a linear mixed-integer formulation to address the short-term hydropower unit commitment problem by maximizing total energy production through optimizing water discharge and power points of turbine combinations. The algorithm penalizes turbine start-ups and imposes constraints on the maximum number of turbine changes to find a feasible solution. Computational results are presented for instances in the Saguenay-Lac-St-Jean region of Quebec in Canada.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2021)
Article
Engineering, Civil
Chengguo Su, Peilin Wang, Wenlin Yuan, Chuntian Cheng, Taiheng Zhang, Denghua Yan, Zening Wu
Summary: This paper focuses on studying reservoir flood control operation with spillway gate scheduling, aiming to minimize the peak outflow and protect downstream areas from flood disasters. By linearizing nonlinear factors and converting the original model into a mixed-integer linear programming formulation, the proposed model is proven to be computationally efficient and capable of producing more realistic and executable flood control operation scheduling.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Electrical & Electronic
Zhentong Shao, Qiaozhu Zhai, Zhihan Han, Xiaohong Guan
Summary: This paper proposes a linear AC unit commitment model to solve the intractable large-scale non-convex and nonlinear AC unit commitment problem. By adopting data-driven linear power flow model and chance-constrained support vector regression, a high-accuracy solution close to the exact AC unit commitment is obtained, and physical models are used to deduce aid formulations to make the model more robust.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Thermodynamics
Wenlin Yuan, Xinqi Wang, Chengguo Su, Chuntian Cheng, Zhe Liu, Zening Wu
Summary: The paper proposed a coordination mode between a PV plant and a large-capacity hydropower plant, and utilized a stochastic optimization model to promote renewable energy consumption, achieving joint operation of a hydro-PV system.
Article
Engineering, Electrical & Electronic
Kazuyuki Ishimoto, Fabio Tossani, Fabio Napolitano, Alberto Borghetti, Carlo Alberto Nucci
Summary: This paper examines the influence of surge arresters installed at close intervals on reducing lightning outages in medium-voltage distribution lines and discusses the effect of electromagnetic pulses on the voltages across line insulators caused by direct lightnings.
IEEE TRANSACTIONS ON POWER DELIVERY
(2022)
Article
Operations Research & Management Science
Manuel Iori, Vinicius Loti de Lima, Silvano Martello, Michele Monaci
Summary: 2DPackLib is a library on two-dimensional orthogonal cutting and packing problems, which includes 25 benchmarks and over 3000 instances. It provides direct links to surveys and typologies, as well as a list of relevant links.
OPTIMIZATION LETTERS
(2022)
Article
Energy & Fuels
Camilo Orozco, Alberto Borghetti, Bart De Schutter, Fabio Napolitano, Giorgia Pulazza, Fabio Tossani
Summary: This paper presents a coordinated day-ahead and intra-day approach for the scheduling of resources in a local energy community. The approach aims to minimize energy procurement costs and ensure economic advantages for each participant, while dealing with the uncertainties of renewable energy.
SUSTAINABLE ENERGY GRIDS & NETWORKS
(2022)
Article
Engineering, Electrical & Electronic
Kazuyuki Ishimoto, Fabio Tossani, Fabio Napolitano, Alberto Borghetti, Carlo Alberto Nucci
Summary: This paper presents and analyzes the response to direct lightning overvoltages of medium-voltage distribution lines equipped with a multi-grounded shield wire and surge arresters. The results indicate that the voltage across the insulator is enhanced by the lightning electromagnetic pulse (LEMP) effects, which increase with the soil conductivity value. The accurate assessment of the lightning performance of these distribution lines, even when direct strikes are considered, requires the modeling of LEMP effects.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Editorial Material
Green & Sustainable Science & Technology
Zhaoyu Wang, Alberto Borghetti, Chen Chen, Fei Ding, Chen-Ching Liu, Jay Liu, Mathaios Panteli, Feng Qiu, Mohammad Shahidehpour
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
(2023)
Article
Energy & Fuels
Tohid Harighi, Alberto Borghetti, Fabio Napolitano, Fabio Tossani
Summary: This paper presents a procedure for optimizing the operation of a community of prosumers connected to a medium voltage distribution network. The procedure takes into account penalties for low power factor, direct exchanges of active and reactive power between prosumers, and provision of reactive power services by the community to the local distribution system operator and the transmission system operator. The procedure calculates the maximum and minimum reactive power deviations that each community participant can provide with respect to a reference profile. The effectiveness of the procedure is demonstrated through numerical simulations of daily scheduling for various test cases.
SUSTAINABLE ENERGY GRIDS & NETWORKS
(2023)
Article
Engineering, Electrical & Electronic
F. Napolitano, F. Tossani, A. Borghetti, C. A. Nucci
Summary: This paper focuses on evaluating the stress on distribution class surge arresters (SAs) caused by lightning strikes. It proposes a procedure for estimating the statistical distribution of energy absorbed by SAs due to both indirect and direct lightning strikes, crucial for assessing the probability of SAs failure. Two different SA representations are considered, a static nonlinear resistance and a dynamic, frequency dependent model. The analysis shows that the static model can be considered accurate enough for evaluating the stress originated by direct and indirect lightning on distribution class SAs.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Chenke He, Jizhong Zhu, Alberto Borghetti, Yun Liu, Shenglin Li
Summary: This paper presents a coordinated planning optimization strategy for charging swapping stations and active distribution networks that includes distributed generation. The approach uses a spatial-temporal load forecasting method for both plug-in EVs and swapping EVs. The developed model is solved using CPLEX and evaluated through a realistic case study.
IET GENERATION TRANSMISSION & DISTRIBUTION
(2023)
Article
Engineering, Electrical & Electronic
Zahra Shafiei Chafi, Hossein Afrakhte, Alberto Borghetti
Summary: This paper focuses on using micro-phasor measurement units (mu PMUs) to promptly detect unplanned islanding conditions. The method involves monitoring voltage and current phasors at distributed generation (DG) buses equipped with mu PMUs. By calculating and summing up the differences between pre-disturbance and post-disturbance phasors, the island condition of the related bus is detected when it exceeds a predefined threshold. The proposed procedure can distinguish islanding conditions from other perturbations and has been analyzed on different distribution systems.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
L. B. Moraes, A. Piantini, M. Shigihara, A. Borghetti, F. Napolitano, C. A. Nucci, F. Tossani
Summary: This paper analyzes the overvoltages caused by direct strokes to a hybrid overhead line and discusses their dependence on parameters such as stroke current front time, soil resistivity, and grounding system impedance. It focuses on the voltages on the medium-voltage circuit. A 1:20 scale model has been created, and the measured voltages align well with the calculated values.
2022 36TH INTERNATIONAL CONFERENCE ON LIGHTNING PROTECTION (ICLP 2022)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
F. Tossani, F. Napolitano, A. Borghetti, C. A. Nucci, C. Tong
Summary: This paper discusses the relationship between lightning current peak amplitudes and stroke locations, proposes a method for estimating the probability of flashover, and compares the prediction results of different models and formulas.
2022 36TH INTERNATIONAL CONFERENCE ON LIGHTNING PROTECTION (ICLP 2022)
(2022)
Proceedings Paper
Energy & Fuels
Fabio Napolitano, Fabio Tossani, Alberto Borghetti, Amedeo Andreotti
Summary: This paper compares two computational tools, LIOV and CiLIV, for calculating overvoltages induced by indirect lightnings. The study validates both tools against experimental results and each other, and identifies discrepancies in voltage waveforms resulting from different assumptions and numerical issues.
2022 20TH INTERNATIONAL CONFERENCE ON HARMONICS & QUALITY OF POWER (ICHQP 2022)
(2022)
Article
Engineering, Electrical & Electronic
Jinping Zhao, Ali Arefi, Alberto Borghetti, Gerard Ledwich
Summary: This paper presents spatial and temporal indices for recognizing the severity of congestions and customer contributions to congestions. Simulation tests on real systems demonstrate the calculation and capabilities of these indices.
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
K. Ishimoto, F. Tossani, F. Napolitano, A. Borghetti, C. A. Nucci
Summary: This paper explores the impact of shield wire on medium-voltage distribution lines in relation to lightning performance, highlighting the importance of considering the effects of electromagnetic pulses, especially in high soil conductivity conditions. The study emphasizes the need for accurate assessment of lightning risks by taking into account the influence of insulators and line response, particularly when the ground conductivity is high.
2021 35TH INTERNATIONAL CONFERENCE ON LIGHTNING PROTECTION (ICLP) AND XVI INTERNATIONAL SYMPOSIUM ON LIGHTNING PROTECTION (SIPDA)
(2021)
Article
Energy & Fuels
Alberto Borghetti, Kazuyuki Ishimoto, Fabio Napolitano, Carlo Alberto Nucci, Fabio Tossani
Summary: This paper investigates the impact of lightning on overvoltages in overhead distribution lines, extends the analysis to the LEMP effect, and assesses the influence of LEMP on the probability of flashovers.
IEEE OPEN ACCESS JOURNAL OF POWER AND ENERGY
(2021)
