Article
Engineering, Electrical & Electronic
Chuanjian Wu, Dahai Zhang, Jinghan He
Summary: Multi-terminal flexible DC power grid is becoming the mainstream in power construction and plays an increasingly important role in the power system. This paper proposes a novel protection scheme using low-frequency transient reactive power to identify faults, which is not affected by distributed capacitance current in the high-frequency band. The effectiveness and superiority of the protection scheme are proved through simulation of the VSC-MTDC power grid.
ELECTRIC POWER SYSTEMS RESEARCH
(2022)
Article
Engineering, Multidisciplinary
Ricardo Granizo, Jose Guerrero, Fernando Alvarez, Carlos Platero
Summary: This article presents a new protection method for ground faults in multiterminal HVdc networks, which involves measuring and analyzing the current polarity in the grounded shields of HVdc cables to quickly and accurately detect and disconnect ground faults. The proposed method has been successfully validated through computer simulations and laboratory tests.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2022)
Article
Energy & Fuels
Tahir Khurshaid, Abdul Wadood, Saeid Gholami Frakoush, Tae-Hwan Kim, Ki-Chai Kim, Sang-Bong Rhee
Summary: This paper presents a continuous genetic algorithm for the optimal allocation of directional relays in an electrical power system to minimize energy consumption. The algorithm is flexible and can adapt to changes and improvements in the optimal location of DG units. It offers practical value for engineers, power utilities, and network operators.
Article
Engineering, Chemical
Wensi Cao, Zhaohui Li, Mingming Xu, Rongze Niu
Summary: This paper proposes a double-ended fault location method for flexible DC cables based on improved local mean decomposition to address the issue of low positioning accuracy caused by modal aliasing and noise interference. Through local mean decomposition and Hilbert transform, the proposed method effectively overcomes the limitations of extreme values and interference noise, achieving a positioning error within 1%.
Article
Engineering, Electrical & Electronic
Botong Li, Yuqi Li, Bin Li, Xiaolong Chen, Liang Ji, Qiteng Hong
Summary: This paper proposes a new direction criterion based on the backward fault travelling wave, which is more robust and operates at a faster speed than traditional methods. It accurately identifies fault direction and has a strong ability to withstand transition resistance.
IET GENERATION TRANSMISSION & DISTRIBUTION
(2023)
Article
Engineering, Electrical & Electronic
Karim Hassan Youssef
Summary: This paper addresses the reliability evaluation of microgrids with distributed generation and directional protection considering protection failure. It proposes two methods and provides simulation results. The proposed methods can be used to assess the impact of protection failure probability on reliability indices, as well as the feasibility of investment, maintenance, and protection schemes.
IEEE TRANSACTIONS ON SMART GRID
(2022)
Article
Energy & Fuels
Mahmood Shaik, Abdul Gafoor Shaik, Sandeep Kumar Yadav
Summary: This paper proposes a fast protection algorithm based on Hilbert-Huang transform for fault detection, classification, and location in a distribution system with solar renewable energy sources. The algorithm extracts instantaneous features from three-phase current signals using Hilbert Transform and utilizes decision tree machine learning models for fault classification and location. Experimental results demonstrate that the algorithm achieves high accuracy across various noise levels.
SUSTAINABLE ENERGY GRIDS & NETWORKS
(2022)
Article
Engineering, Electrical & Electronic
Jovana Dakic, Marc Cheah-Mane, Oriol Gomis-Bellmunt, Eduardo Prieto-Araujo
Summary: The design distance of offshore wind power plants connected through HVAC transmission systems can be extended by introducing mid-cable reactors for reactive power compensation and utilizing higher voltage AC cables. A methodology has been developed to determine the optimal design of such transmission systems, considering minimizing power losses and reactor costs for various wind speed conditions. The optimal HVAC voltage level, number of reactors, and their locations are determined for different OWPP rated powers and distances, with the final transmission system selected based on total costs between HVAC and HVDC configurations.
IEEE TRANSACTIONS ON POWER DELIVERY
(2021)
Article
Energy & Fuels
Sehyun Kim, Kyeon Hur, Jongseo Na, Jongsu Yoon, Heejin Kim
Summary: This paper proposes a generic analysis framework for a grid supporting MMC-HVDC in a MILM system, which compensates for reactive power consumptions and varying power system conditions. The framework, validated through simulations, can be applied to various power system conditions.
Article
Green & Sustainable Science & Technology
Asha Radhakrishnan, Sarasij Das
Summary: The presence of Converter Interfaced Generations (CIGs) presents challenges to traditional protection schemes, particularly affecting Breaker Failure Protection (BFP). It is proposed to use voltage-dependent adaptive settings to enhance security of BFP schemes.
IET RENEWABLE POWER GENERATION
(2021)
Article
Energy & Fuels
Shuhao Liu, Kunlun Han, Hongzheng Li, Tengyue Zhang, Fengyuan Chen
Summary: A two-terminal directional protection method for HVDC transmission lines is proposed based on SSA-VMD and Hilbert phase difference, which can quickly and effectively identify faults and has good tolerance to transition resistance and noise interference.
Article
Optics
Lina Li, Jianshe Ma, Da Sun, Zhanquan Tian, Liangcai Cao, Ping Su
Summary: We demonstrate a lensless imaging system with edge-enhanced imaging constructed with a Fresnel zone aperture (FZA) mask placed 3 mm away from a CMOS sensor. We propose two algorithms, vortex back-propagation (vortex-BP) and amplitude vortex-BP, to achieve fast reconstruction and noise removal for the FZA-based lensless imaging system. Our proposed algorithms also enable directionally controlled anisotropic edge enhancement. This technology has potential applications in autonomous driving, artificial intelligence recognition in consumer electronics, and other fields.
Review
Green & Sustainable Science & Technology
M. J. Perez-Molina, D. M. Larruskain, P. Eguia Lopez, G. Buigues, V. Valverde
Summary: This paper reviews different types of protection methods for MTDC systems, which include protection systems based on current measurement, voltage measurement, traveling wave analysis, and artificial intelligence. Protection systems can be classified based on the use of local measurements or a communication channel in their operation. The majority of protection methods are based on current measurement algorithms, and many systems benefit from a combination of different methods.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Review
Chemistry, Multidisciplinary
Ali Raza, Ali Mustafa, Umar Alqasemi, Kumars Rouzbehi, Raheel Muzzammel, Song Guobing, Ghulam Abbas
Summary: This paper summarizes HVdc breaker technologies from the last two decades mainly distributed in literature, presenting a comparison of various state-of-the-art HVdc breakers. Areas for further research and development are identified, aiming to provide primary challenges and prospects in the HVdc breaker field.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Electrical & Electronic
Ricardo Granizo Arrabe, Jose M. Guerrero Granados, Fernando Alvarez Gomez, Carlos A. Platero Gaona
Summary: Ground faults are a major cause of electrical failure in transmission and distribution systems. Detecting the location of the first ground fault in ungrounded distribution networks is challenging, making it necessary to develop a selective and directional protection method. This paper introduces a new method that evaluates residual currents and reference currents to determine the faulty line. The method is easy to implement and provides an economical solution.
IEEE TRANSACTIONS ON POWER DELIVERY
(2022)
