Article
Engineering, Electrical & Electronic
Heling Yuan, Yan Xu, Cuo Zhang
Summary: This paper proposes a robust optimization method to address the impact of wind power generators on transient stability of a power system. By considering uncertain wind power output, coordinating generation dispatch and emergency load shedding, this method offers an effective solution.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2022)
Article
Green & Sustainable Science & Technology
Shuwei Xu, Wenchuan Wu, Yue Yang, Chenhui Lin, Yingshang Liu
Summary: This article proposes a chance-constrained economic dispatch model for optimal wind curtailment and load shedding schemes, addressing the infeasibility issues of conventional models. The proposed method converts complex chance constraints into deterministic inequalities and utilizes a two-layer iterative algorithm based on the generalized Benders decomposition framework for efficient solution.
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Ying-Yi Hong, Chih-Yang Hsiao
Summary: This study proposes an optimal setting method for under-frequency load shedding in an offshore standalone power grid, using under-frequency relays to prevent blackouts. The total shed load and frequency nadir are optimized using the TS-PSO algorithm, with the developed TS fuzzy rules adjusting the inertia weight and learning factors.
IEEE TRANSACTIONS ON POWER DELIVERY
(2022)
Article
Energy & Fuels
Ying-Yi Hong, Chih-Yang Hsiao
Summary: The study presents an event-based under-frequency load shedding (UFLS) scheme for an offshore standalone power grid with renewables to prevent cascading outages caused by low frequency protection of wind power generators and photovoltaic arrays. The scheme minimizes total shed load and maximizes frequency nadir using particle swarm optimization (PSO). Simulation results show that the proposed method outperforms utility and existing methods in terms of shed load and frequency overshoot.
Article
Engineering, Electrical & Electronic
Jose Ignacio Sarasua, Guillermo Martinez-Lucas, Juan Ignacio Perez-Diaz, Daniel Fernandez-Munoz
Summary: The study analyzes the benefits of alternative control strategies in reducing the need for load shedding activation in one of the Canary Islands, El Hierro island. These strategies include the variable speed wind turbines' inertial contribution to frequency regulation, the use of Pelton turbines as synchronous condensers, and the participation of variable speed pumps in frequency regulation. The results show that these alternative control strategies effectively reduce or avoid the amount of load to be shed in many scenarios, each presenting their own particularities.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Hui Liu, Houlin Pan, Ni Wang, Muhammad Zain Yousaf, Hui Hwang Goh, Saifur Rahman
Summary: This study proposes a bi-level confidence-interval-based optimal strategy to involve electric vehicles (EVs) in under-frequency load shedding (UFLS) and mitigates the impact of uncertainty on frequency stability. Simulation results show that the proposed approach outperforms traditional and adaptive UFLS schemes in maintaining a stable frequency.
IEEE TRANSACTIONS ON SMART GRID
(2022)
Article
Energy & Fuels
Jian Zhang, Yong Wan, Quan Ouyang, Meng Dong
Summary: The aim of this paper is to extract maximum power from wind energy for the doubly fed induction generator based wind turbine system (DFIG-WT) under continuous stochastic perturbations of wind speed. The DFIG-WT is modeled as the Ito stochastic differential equations. The stochastic backstepping control method and the gain suppressing inequality technique are employed to guarantee that the relative rotor speed to the optimal value is bounded in probability. Furthermore, we extend the bounded result to the asymptotic stability of the rotor speed control loop. In addition, the parametric uncertainties in DFIG-WT are also considered in our control synthesis. The simplicity, robustness and efficiency of the designed controller are verified under the special wind speed with white noise through numerical simulation of a 660 KW DFIG-WT.
Article
Energy & Fuels
Yanan Li, Jia'an Zhang, Zhijun Li, Peng Yang, Huajun Wang
Summary: A novel double rotor wind turbine generation system is proposed in this paper, which adopts a new technical route for concept design and is proven superior in anti-impact load capacity through simulation analysis.
Article
Energy & Fuels
Anan Garzozi, David Greenblatt
Summary: This research investigates the effects of alternating slot blowing (ASB) on wind energy generation in oscillating wind energy conversion systems. It was found that ASB significantly improves energetic efficiency by exceeding natural vortex shedding amplitudes and producing higher net peak power coefficients compared to conventional VIV energy harvesters. Further research is needed to improve slot design, flow excitation and forcing, and mathematical modeling of the system.
Article
Engineering, Electrical & Electronic
Thais P. Teixeira, Carmen L. T. Borges
Summary: The variability of wind power generation requires a flexible energy reserve to compensate for imbalances, and coordinating battery energy storage with wind power generation can reduce system risks.
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
(2021)
Article
Thermodynamics
Fang Yuan Xu, Rui Xin Tang, Si Bin Xu, Yi Liang Fan, Ya Zhou, Hao Tian Zhang
Summary: This paper proposes an integrated PV prediction structure that aims to minimize industrial cost rather than focusing solely on accuracy. The study shows that this integrated structure leads to prediction results with lower cost compared to accuracy-based structures.
Article
Environmental Sciences
Andrew Gunn, Roger Dargaville, Christian Jakob, Shayne McGregor
Summary: To meet the demand for electricity from renewable energy, it is important to choose wind farm locations that minimize variability in output, especially during the night when solar photovoltaics are unreliable. The location of wind farms must consider grid proximity, resource potential, and wind correlation between farms.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Thermodynamics
Attoti Bharath Krishna, Abhijit R. Abhyankar
Summary: This paper proposes a new and efficient data-driven temporal wind power scenario generation framework using regular vine copula with variance reduction. This framework improves the quality of temporal scenarios by introducing the regular vine copula to model the temporal dependence structure and proposing a uniform design-based vine copula sampling algorithm. The proposed scenario generation method outperforms existing benchmarks according to a detailed multivariate scenario evaluation using multiple metrics and the Diebold-Mariano statistical test.
Article
Green & Sustainable Science & Technology
Yang Zhang, Yihan Liu, Bing Luo, Yun Ling
Summary: In this paper, a Variable weight coefficient Model Predictive Control (V-MPC) strategy is proposed to improve the control performance of quasi-Z source inverters (qZSI) in wind power systems. By coordinating the proportioning weights in the optimal scheduling algorithm and adjusting the qZSI algorithm or VSG control proportion based on the system frequency, the V-MPC can effectively suppress frequency fluctuations and minimize current ripple and THD in load currents waveform compared to conventional FCS-MPC.
IET RENEWABLE POWER GENERATION
(2023)
Article
Engineering, Electrical & Electronic
Jian Xu, Boyu Xie, Siyang Liao, Zhiyong Yuan, Deping Ke, Yuanzhang Sun, Xiong Li, Xiaotao Peng
Summary: This paper proposes an online load shedding strategy based on PMU and a multi-period restoration strategy based on CVR for intentional island operation with renewable distributed generation. The strategies aim to solve power imbalance issues during blackout events through load shedding optimization and restoration plans.
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
(2021)
Article
Engineering, Electrical & Electronic
Mehrdad Hajizadeh, Gevork B. Gharehpetian, Saeid Gassem Zadeh, Mohammad Tolou Askari
Summary: This research aims to evaluate the positive effect of private investors in microgrid configuration and optimize it using a two-objective function. Reliability indices are considered as constraints for comprehensive evaluation of the planning problem. The study shows the effects of demand side management in reducing operational costs through various demand response programs. The results reveal a reduction in total costs for both MGO and private investors in TOU-based demand response program.
IETE JOURNAL OF RESEARCH
(2023)
Article
Computer Science, Artificial Intelligence
Mehrdad Hajizadeh, G. B. Gharehpetian, Saeid Ghassem Zadeh, Mohammad Tolou Askari
Summary: In this study, the optimization of smart parking lots (SPL) with various energy sources is explored to minimize voltage drop and power loss in distribution networks. Simulations using direct load control and time of use reveal improved technical constraints of SPL-based distribution networks. A two-stage optimization algorithm is employed for this purpose.
EVOLUTIONARY INTELLIGENCE
(2023)
Article
Computer Science, Information Systems
Hosein Ghasemi, Jamshid Aghaei, Gevork B. Gharehpetian, Miadreza Shafie-Khah, Joao P. S. Catalao
Summary: This article presents a bi-level decomposition approach for coordinated planning of multiple energy systems, aiming to determine optimal investment candidates and enhance overall system efficiency and flexibility. By utilizing mixed integer linear programming model and a new BLDA methodology, the complexity and computation time limitations of expansion planning problems are overcome.
IEEE SYSTEMS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
A. Azizpour, M. Radmehr, M. Firouzi, G. B. Gharehpetian
Summary: This paper proposes a novel AC/DC fault current limiter (ADFCL) to limit short circuit current in hybrid AC/DC microgrids (ADMGs). Both experimental and simulation results demonstrate that the ADFCL can limit the faulty microgrid using only one limiting resistor without affecting the performance of the healthy one.
INTERNATIONAL JOURNAL OF ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Nassim Shahbazi, Sajad Bagheri, Gevork B. Gharehpetian
Summary: This article introduces a new differential protection scheme for transformers, which is based on the self-adaptive biased characteristic curve and takes into account CCFs and various disturbances. By using the maximum overlap discrete wavelet transform and MATLAB software, a new self-adaptive biased characteristic curve is obtained and the differential protection operation is adjusted based on this curve. Simulation results show that this scheme can accurately detect various faults and events in transformers and improve system reliability.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Hamid Karimi, G. B. Gharehpetian, Roya Ahmadiahangar, Argo Rosin
Summary: This paper proposes a multi-objective optimization framework to improve the performance of demand response programs in distribution networks. The uncoordinated response of customers creates new peaks in the load profile when market prices are low, so the framework focuses on reducing operating costs and enhancing program efficiency. The model introduces the Average Power Flexibility during Peak Period Index (APFDPPI) to evaluate energy flexibility and simulation results show significant improvements compared to uncoordinated programs.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Automation & Control Systems
Mahdi Zolfaghari, Gevork B. B. Gharehpetian
Summary: This study presents a new platform for connecting multiple microgrids using a unified interphase power controller (UIPC), which would enable a system of systems with interconnected AC and DC microgrids to exchange power in a controlled manner. The UIPC is designed with a new structure based on a current-controlled four-leg power converter configuration to satisfy voltage and frequency support. Additionally, the UIPC is equipped with an affine projection-like optimal control (APLOC) strategy for managing power and voltage oscillations in the heterogeneous environment. Simulation results demonstrate the effectiveness of the proposed networked microgrids model in controlling power exchange and improving power quality.
IET CONTROL THEORY AND APPLICATIONS
(2023)
Article
Computer Science, Information Systems
Mohammad Saeed Mahdavi, Mohammad Saleh Karimzadeh, Tohid Rahimi, Gevork Babamalek Gharehpetian
Summary: This paper proposes a fault-tolerant topology and fault diagnosis algorithm for a bidirectional DC-DC converter in a BESS. The topology can detect open circuit faults and reconfigure the system to ensure safe and continuous operation. The fault diagnosis algorithm detects open circuit faults by observing the current of the inductors, eliminating the need for sensors and reducing the cost, weight, volume, and complexity of the system.
Article
Automation & Control Systems
Arya Hosseini, Amin Siahchehreh Badeli, Masoud Davari, Samad Sheikhaei, Gevork B. Gharehpetian
Summary: This article proposes a novel digital control method for low-power applications in multiple-input, single-inductor, multiple-output dc-dc converters. It utilizes stability analysis, time-multiplexing control method, and variable-frequency pulsewidth modulation to charge each output with different frequencies, while also implementing a digitally controlled zero-current switching technique for optimal inductor discharge duty cycle determination.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Mojtaba Fekri, Javad Nikoukar, Gevork B. Gharehpetian
Summary: This paper proposes a cascading failure model based on transmission line thermal limit to extract and analyze hazardous high-probability scenarios of N-K (1<K<3) contingencies. The proposed fault evaluation method is employed for risk assessment of cascading failures and identification of their initial events. The proposed approach considers vulnerability criteria and operation constraints. The results of application to the standard IEEE 39-bus test system verify the efficiency and accuracy of the proposed approach.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Automation & Control Systems
Rohollah Abdollahi, Gevork B. Gharehpetian, Amjad Anvari-Moghaddam, Frede Blaabjerg
Summary: This article proposes a new simple pulse multiplication circuit (SPMC) with low current stress to upgrade a normal 20-pulse autotransformer rectifier (20PAR) to a 40PAR. The SPMC includes two tapped interphase reactors and two additional diodes with lower conduction losses. Compared to conventional pulse multiplication circuits, the proposed SPMC does not require a zero-sequence blocking transformer, making it simpler to implement. Simulation and experimental results show that the input current's total harmonic distortion using 40PAR is less than 3%, meeting the DO-160G requirements for aviation applications.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Construction & Building Technology
Monir Kamali, Bahador Fani, Ghazanfar Shahgholian, Gevork B. Gharehpetian, Masoud Shafiee
Summary: In this study, an improved model of optimal power sharing, energy management, and THD control in AC microgrids is proposed. The model considers the random behavior of electric vehicles and aims to control voltage and frequency parameters. The primary controller focuses on optimal power sharing, impedance mismatch reduction, and THD reduction, while the secondary controller uses the PSO algorithm to minimize power distribution error and optimize virtual impedance parameters. The proposed model is compared with conventional and other meta-heuristic methods, and its stability is verified using various analysis techniques.
SUSTAINABLE CITIES AND SOCIETY
(2023)
Article
Computer Science, Information Systems
Arash Imanlou, Ebrahim Seifi Najmi, Reza Behkam, Morteza Nazari-Heris, Gevork B. Gharehpetian
Summary: This paper proposes a new high step-up DC-DC topology based on the active switched-inductor technique, which utilizes a coupled inductor for performance enhancement. The presented topology achieves better voltage gain and efficiency, reduces power loss by using MOSFETs with a low voltage rating, enhances voltage gain by reducing the turn ratio of the coupled inductor, achieves zero DC bias and solves the core saturation problem. Experimental results verify the validity of the study and the performance of the proposed topology.
Article
Computer Science, Information Systems
Alireza Asadi, Mohammad Saleh Karimzadeh, Xiaodong Liang, Mohammad Saeed Mahdavi, Gevork B. Gharehpetian
Summary: This paper presents a single-inductor multi-input single-output (SI-MISO) DC-DC boost converter for solar photovoltaic (PV) systems in DC or AC grids. The converter utilizes a new switching algorithm to independently control the output voltage and power absorbed from each source, resulting in a simple and unique controller. Additionally, a multivariable control system and a proportional-integral-derivative (PID) cascade control scheme are employed to achieve N number of single-input single-output (SISO) systems without switch delays. Experimental results confirm the accuracy and efficiency of the proposed control scheme using a 100-W prototype converter.
Proceedings Paper
Green & Sustainable Science & Technology
Farhad Safargholi, Kia Malekian Boroujeni, Gevork B. Gharehpetian
Summary: This paper presents a novel method that uses the fingerprint technique to characterize the behavior of transformer cores and estimate their parameters. The method describes how harmonic current is affected by different harmonic voltage backgrounds and establishes a linear Norton equivalent model for the transformer cores based on reflected currents at the terminals. The paper also proposes a new method for estimating the parameters of the Norton equivalent model.
2022 IEEE INTERNATIONAL CONFERENCE ON ENVIRONMENT AND ELECTRICAL ENGINEERING AND 2022 IEEE INDUSTRIAL AND COMMERCIAL POWER SYSTEMS EUROPE (EEEIC / I&CPS EUROPE)
(2022)
Article
Green & Sustainable Science & Technology
Seyed Majid Hashemzadeh, Mohammed A. Al-Hitmi, Hadi Aghaei, Vafa Marzang, Atif Iqbal, Ebrahim Babaei, Seyed Hossein Hosseini, Shirazul Islam
Summary: This article proposes an interleaved high step-up DC-DC converter topology with an ultra-high voltage conversion ratio for renewable energy applications. The converter utilizes an interleaved structure to reduce the input source current ripple, which is advantageous for solar PV sources. By employing voltage multiplier cells and coupled inductor techniques, the topology enhances the output voltage. The article provides comprehensive operation modes and steady-state analyses, compares the proposed structure with other similar converter topologies, and validates the mathematical analysis with experimental results.
IET RENEWABLE POWER GENERATION
(2024)
Article
Green & Sustainable Science & Technology
Gang Xu, Zixuan Guo
Summary: This paper proposes a two-stage resilience enhancement strategy for the recovery of critical loads after disasters. The first stage utilizes a heuristic algorithm to determine the post-disaster topology, while the second stage incorporates user demand response to maximize the socio-economic value of the recovery.
IET RENEWABLE POWER GENERATION
(2024)
Article
Green & Sustainable Science & Technology
Faruk Oral
Summary: This study investigates the wind characteristics and electricity generation potential from wind energy in the Bitlis-Rahva region in eastern Turkey. Wind data from the Bitlis meteorological station is analyzed using the WindPRO program to determine the wind speed distribution and predict turbine performance. The results show that the region has low wind energy capacity factor, indicating it is not efficient for wind energy investments. However, it is suggested that higher altitudes in the region may have better wind energy utilization.
IET RENEWABLE POWER GENERATION
(2024)
Article
Green & Sustainable Science & Technology
Yingjie Tang, Zheren Zhang, Zheng Xu
Summary: This paper investigates the modular multilevel matrix converter with symmetrically integrated energy storage for low frequency AC system. An evaluation method for the minimum required number of active submodules is presented, and the influences of operating conditions on the minimum required number of active submodules are studied. Issues about the converter control system are also discussed in this paper.
IET RENEWABLE POWER GENERATION
(2024)
