Article
Engineering, Electrical & Electronic
Dong Wang, Jianhao Fu, Mengqian Hou, Feng Qiao, Mengyou Gao
Summary: A novel TW fault location principle for VSC-HVDC transmission line is proposed in this paper, aiming to improve fault location accuracy through TW arrival time detection and propagation velocity calculation methods, and its robustness against fault type, resistance, and location issues is validated using a simulation model.
ELECTRIC POWER SYSTEMS RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
Farzad Dehghan Marvasti, Ahmad Mirzaei
Summary: This paper proposes a hybrid travelling wave/distance protection system for HVDC transmission lines, which continuously monitors the phase angles of characteristic harmonic impedances to differentiate between internal and external faults and protect most of the line length. Wavelet analysis is used to detect faults within fail-to-trip regions where the protection method may fail to operate effectively.
ELECTRICAL ENGINEERING
(2021)
Article
Energy & Fuels
Aleena Swetapadma, Shobha Agarwal, Almoataz Y. Y. Abdelaziz, Hossam Kotb, Kareem M. M. AboRas, Aymen Flah, Mokhtar Shouran
Summary: This study proposes a method to distinguish internal and external faults in the DC section by calculating the difference in voltage signals and utilizing machine learning and deep learning techniques for fault detection. The results show that the proposed method can accurately differentiate internal and external faults with 100% accuracy, and provides higher sensitivity and reliability compared to conventional traveling wave-based relay.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Wei Chen, Dong Wang, Donghai Cheng, Ximei Liu
Summary: A novel travelling wave fault location approach for MMC-HVDC transmission line based on frequency modification algorithm is proposed in this paper, aiming to achieve better fault location performance by studying the complex boundary characteristics.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Computer Science, Information Systems
Ahmed Saber
Summary: This article proposes a new backup protection algorithm for bipolar high voltage alternative current (HVdc) lines using two-end synchronized sampled currents, which can detect and recognize faulted poles directly without long time delay. The algorithm removes noise in current signals, discriminates internal faults from external faults, and utilizes a frequency dependent phase model to simulate the HVdc transmission line, with simulation results showing satisfactory performance.
IEEE SYSTEMS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Zhen Liu, Houlei Gao, Sibei Luo
Summary: Currently, the voltage-derivative-based protection method is used in HVDC lines but it has low reliability for high-resistance faults and is difficult to apply to long distance lines. To address this issue, a novel non-unit protection scheme based on waveform similarity coefficient is proposed. The feasibility and validity of this protection method are verified using a +/- 800 kV HVDC system in PSCAD/EMTDC, and simulation results show that it accurately identifies internal and external faults, including high resistance and long-distance faults.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Shimin Xue, Junchi Lu, Yabing Sun, Shouxiang Wang, Botong Li, Bin Li
Summary: A reverse travelling wave differential protection scheme is proposed to address the rapid and reliable identification of faulty lines in HVDC grids, with advantages in fault resistance tolerance and anti-interference capability. Extensive simulation results verify the effectiveness of the proposed protection scheme.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Dalin Mu, Sheng Lin, Pinggang He, Xiaopeng Li
Summary: In this study, an improved traveling wave protection (TWP) scheme based on the compensation of the line-mode component of fault voltage (LMCFV) is proposed to solve the problem of low sensitivity under high resistance faults in traditional TWP. The expressions of the LMCFV at different fault locations in HVDC systems are derived. It is found that the linear relationship between LMCFV and fault resistance exists for DC line faults, whereas it is broken for external faults. Based on this, the LMCFV for the metal fault at the DC line midpoint is used as a reference value to compensate for faults in other cases. The protection scheme constructed based on the compensatory LMCFV and compensation coefficient can accurately identify DC line faults.
IEEE TRANSACTIONS ON POWER DELIVERY
(2023)
Article
Engineering, Electrical & Electronic
Dong Wang, Donghai Cheng, Xiao Sun, Wei Chen, Feng Qiao, Ximei Liu, Mengqian Hou
Summary: LCC and MMC are currently used in hybrid HVDC transmission technology. In order to overcome the shortcomings, this paper proposes a novel TW directional pilot backup protection for hybrid LCC-MMC-MTDC transmission line.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Jing Ma, Chen Liu, Yuchong Wu, A. G. Phadke
Summary: This paper proposes a new pilot directional protection scheme based on grounding resistance for LCC-HVDC system, which effectively solves the problems of poor immunity of existing DC line protection methods to fault resistance in internal fault cases and easy operation malfunctions in external fault cases. By establishing the impedance characteristic equations of the converter and building the fault transient network, a protection criterion is formed based on the grounding resistance. Simulation tests verify that the proposed method can correctly identify different types of faults and is immune to variations in the operating status of the converter and the operation mode of the AC system.
IEEE TRANSACTIONS ON POWER DELIVERY
(2022)
Article
Engineering, Electrical & Electronic
Junchao Zheng, Peng Li, Kai Xu, Xiangping Kong, Chenqing Wang, Jinjiao Lin, Chi Zhang
Summary: In order to improve the protection scheme for HVDC lines, a novel distance backup protection scheme is proposed in this paper. By using an equivalent model and a directional relay, the protection performance issues are resolved. Simulation results demonstrate the effectiveness and reliability of the proposed scheme.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
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
Rafael L. S. Franca, Francisco C. Silva Junior, Flavio B. Costa, Kai Strunz, Athula D. Rajapakse
Summary: This paper proposes a one-terminal traveling wave (TW)-based transmission line protection for line commu-tated converter (LCC) of high-voltage direct current (HVDC) systems. The method considers the arrival of the first and second wavefronts at the local bus and takes into account the system's boundary conditions. A mathematical analysis of the effects of sampling frequency is presented, providing the basis for practical innovations. The proposed method demonstrates good dependability and can operate below 15 ms for a 2900 km long transmission line.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Thermodynamics
Yuhan Zhang, Shunliang Wang, Tianqi Liu, Shu Zhang, Qingyuan Lu
Summary: The proposed single-ended protection scheme for DC lines in the VSC-HVDC transmission system based on phase-mode transformation and wavelet transform modulus maximum (WTMM) theories has been verified to have high selectivity in extensive simulation tests. It is suitable for close-by faults with different fault types and is not overly reliant on data synchronization.
Article
Engineering, Electrical & Electronic
Yuhan Zhang, Shunliang Wang, Tianqi Liu, Xiaopeng Li, Hoay Beng Gooi, Amer M. Y. M. Ghias, Ruiting Xu, Tianyu Chang
Summary: This study proposes a backup protection scheme based on directional traveling wave and waveform similarity for VSC-HVDC transmission lines, which can compensate for the shortcomings of existing schemes and improve the reliability, selectivity, rapidity, and sensitivity of protection.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Yanxun Guo, Haifeng Li, Yuansheng Liang, Gang Wang
Summary: Accurate fault calculation is crucial for HVDC grid parameter design and protection research. This paper proposes a general method based on MMC and numerical inversion of the Laplace transform. The method is more time efficient than electromagnetic transient simulation and applicable to different configurations of HVDC grids.
IEEE TRANSACTIONS ON POWER DELIVERY
(2021)
Article
Engineering, Electrical & Electronic
Xinquan Chen, Haifeng Li, Gang Wang, Canxiong Xu, Yuansheng Liang
Summary: This article proposes a convolution power-based protection scheme for Hybrid-MTDC systems, which can effectively identify DC faults, distinguish between external and internal faults, locate DC bus faults, and select faulty poles. The scheme shows high reliability and sensitivity in PSCAD/EMTDC simulations.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Jiaquan Chen, Haifeng Li, Chengjiang Deng, Gang Wang
Summary: A novel single-phase to ground fault detection method is proposed specifically for low-resistance grounded systems, utilizing the concept of Delta-circuit to suppress system imbalance effects and calculating ZS power factor with SIP theory for line state discrimination. Multiple simulations in PSCAD software confirm the effectiveness of the method for various SPGFs, including those with different impedance levels and fault characteristics.
IEEE TRANSACTIONS ON POWER DELIVERY
(2021)
Article
Engineering, Electrical & Electronic
Yanxun Guo, Haifeng Li, Guangkun Gu, Dehui Zeng, Gang Wang
Summary: DC circuit breakers (DCBs) are used to isolate faults in high-voltage DC grids. Multiple DCBs connected to multiple lines form a DCB cluster, which can be integrated into a multiport DCB (MDCB) to reduce construction costs. This article proposes a novel MDCB to integrate current-injection-DCBs (C-DCBs) for improved interruption reliability. The proposed MDCB is compared with traditional DCB clusters and previous MDCBs to show economic and reliability advantages, and is validated using simulations.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Yuansheng Liang, Zihong Zhang, Haifeng Li, Jiayan Ding, Gang Wang, Lixin Chen
Summary: This paper studies a robust and accurate discrete Fourier transform (DFT)-based phasor estimation method to improve the accuracy of frequency domain fault location methods. By analyzing the deviation characteristics and using rotation factor computation to construct linear equations, the accurate fundamental frequency phasor can be estimated during the fault transient process. The proposed method adjusts frequency deviation using interpolation method and applies the PauTa criterion to enhance the robustness. Test results demonstrate improvement in fault location accuracy during the fault transient process.
IET GENERATION TRANSMISSION & DISTRIBUTION
(2022)
Article
Engineering, Electrical & Electronic
Yuansheng Liang, Liantao Jiang, Haifeng Li, Gang Wang, Qing Zhong, Longjun Wang
Summary: By fully combining the advantages of line commutated converter (LCC) high-voltage direct current (HVDC) and modular multilevel converter (MMC)-HVDC systems, hybrid multiterminal HVDC (hybrid-MTDC) transmission technology has become a new technical means to overcome the shortcomings of conventional two-terminal HVDC systems. This article focuses on a parallel hybrid-MTDC system and establishes a mathematical analysis model. Based on the model, a protection scheme based on phase characteristics is proposed to identify faults in high-resistance line. The proposed method is verified using electromagnetic transient simulation and shows high sensitivity, reliability, and adaptability to different operation modes.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Jie Li, Yinliang Liu, Chengxin Li, Dehui Zeng, Haifeng Li, Gang Wang
Summary: This paper proposes a fault location scheme using feeder terminal units (FTUs) for high-impedance grounding faults in resonant grounding systems (RGSs). The scheme analyzes the parallel resonance for a high-impedance fault (HIF) in an RGS with inverter-interfaced distributed generators (IIDGs). It concludes that the transient zero-sequence admittances (TZSAs) from FTUs upstream of the fault point have the maximum value, while the TZSAs obtained from FTUs downstream of the fault point are small for HIFs. The proposed scheme achieves accurate fault location by utilizing the above results and comparing them with action criteria.
IEEE TRANSACTIONS ON POWER DELIVERY
(2022)
Article
Engineering, Electrical & Electronic
Yuansheng Liang, Jiayan Ding, Haifeng Li, Gang Wang, Zihong Zhang
Summary: This paper proposes a new frequency-domain fault location method by utilizing the DDC deviation phasor to find the phase-time space curve with exponential attenuation characteristic. The evaluation index of fault point characteristic is established based on the feature difference, and a new fault location criterion is constructed. The high performance of the proposed method is validated through electromagnetic transient fault simulation.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Haifeng Li, Wenzhao Liang, Yuansheng Liang, Zhikeng Li, Gang Wang
Summary: This paper proposes an unsupervised learning and graph theory-based method to identify four-level topology information and generate a topology diagram for low-voltage distribution networks. The tSNE-DBSCAN-LLE algorithm is used to identify the topology information, and the identified information is used to simply generate a topology diagram. The effectiveness and advantageousness of the proposed method are demonstrated through analysis of simulation data and actual data from three LV distribution networks.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Computer Science, Information Systems
Huamin Liang, Haifeng Li, Gang Wang
Summary: This paper analyzes the fault characteristics of a low-resistance grounded system (LRGS) and proposes a high-sensitivity single-phase-to-ground fault (SPGF) detection method. The method takes into account the existence of unbalanced loads and asymmetric parameters, can detect high-impedance faults and nonlinear arc grounding faults, and has a signal-to-noise ratio of 20 dB.
Article
Engineering, Electrical & Electronic
Haifeng Li, Huimin Jiang, Yuansheng Liang, Yongzhi Xu, Gang Wang
Summary: This paper solves the problems of sensitivity and rapidity in flexible HVDC line protection by analyzing the waveform characteristics of fault-generated traveling waves. By using the Levenberg-Marquardt method for data fitting, a non-unit traveling wave protection scheme based on the ratio of fitting residuals is proposed. Extensive simulations show that the scheme can reliably identify all faults within 1 ms with high sensitivity and robustness.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
