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Shimin Xue
Key Laboratory of Smart Grid of Ministry of Education; Tianjin University; China

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Journal article
Published: 08 August 2018 in Energies
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Accurate and reliable fault location method for alternating current (AC) transmission lines is essential to the fault recovery. MMC-based converter brings exclusive non-linear characteristics to AC networks under single-phase-to-ground faults, thus influencing the performance of the fault location method. Fault characteristics are related to the control strategies of the converter. However, the existing fault location methods do not take the control strategies into account, with further study being required to solve this problem. The influence of the control strategies to the fault compound sequence network is analyzed in this paper first. Then, a unique boundary condition that the fault voltage and negative-sequence fault current merely meet the direct proportion linear relationship at the fault point, is derived. Based on these, a unary linear regression analysis is performed, and the fault can be located according to the minimum residual sum function principle. The effectiveness of the proposed method is verified by PSCAD/EMTDC simulation platform. A large number of simulation results are used to verify the advantages on sampling frequency, fault resistance, and fault distance. More importantly, it provides a higher ranging precision and has extensive applicability.

ACS Style

Shimin Xue; Junchi Lu; Chong Liu; Yabing Sun; Baibing Liu; Cheng Gu. A Novel Single-Terminal Fault Location Method for AC Transmission Lines in a MMC-HVDC-Based AC/DC Hybrid System. Energies 2018, 11, 2066 .

AMA Style

Shimin Xue, Junchi Lu, Chong Liu, Yabing Sun, Baibing Liu, Cheng Gu. A Novel Single-Terminal Fault Location Method for AC Transmission Lines in a MMC-HVDC-Based AC/DC Hybrid System. Energies. 2018; 11 (8):2066.

Chicago/Turabian Style

Shimin Xue; Junchi Lu; Chong Liu; Yabing Sun; Baibing Liu; Cheng Gu. 2018. "A Novel Single-Terminal Fault Location Method for AC Transmission Lines in a MMC-HVDC-Based AC/DC Hybrid System." Energies 11, no. 8: 2066.

Paper
Published: 06 March 2018 in IEEJ Transactions on Electrical and Electronic Engineering
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The application of voltage source converter (VSC)‐based interconnection devices or distributed generators (DGs) in an AC distribution system makes the network change from a single‐terminal power supply network to a multi‐terminal power supply network. However, traditional three‐section current protection applied in AC distribution networks is not capable of identifying the direction of the fault, and therefore it is necessary to install directional elements to ensure the reliability of the three‐section current protection. The phase relationships among negative‐sequence currents under phase‐to‐phase faults that happen at different locations in the AC distribution network connected with back‐to‐back VSC‐based interconnection device are derived first in this paper. Then a novel criterion based on the phase relationships among the negative‐sequence currents flowing through the protected line and the other two branches emanating from the same bus is proposed for fault direction identification. The proposed directional criterion is applicable to multi‐terminal power supply networks containing VSC‐based interconnection devices or VSC‐interfaced DGs, with three or more branches emanating from each bus. The proposed directional criterion does not require potential transformers (PTs), and is hardly affected by transient resistance. Under a symmetrical fault, negative‐sequence current can be obtained by delaying the filtering data window of any one of three phases, and the dead zone of traditional directional elements when the fault happens at the outlet of the relay can be avoided. The validity of the proposed criterion is verified by several PSCAD simulation results. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

ACS Style

Shimin Xue; Zhe Shi; Renle Huang; Qiankun Chang; Junchi Lu; Jingyue Yang. A criterion for non-voltage directional elements applied in AC networks connected with VSC-based interconnection devices. IEEJ Transactions on Electrical and Electronic Engineering 2018, 13, 587 -594.

AMA Style

Shimin Xue, Zhe Shi, Renle Huang, Qiankun Chang, Junchi Lu, Jingyue Yang. A criterion for non-voltage directional elements applied in AC networks connected with VSC-based interconnection devices. IEEJ Transactions on Electrical and Electronic Engineering. 2018; 13 (4):587-594.

Chicago/Turabian Style

Shimin Xue; Zhe Shi; Renle Huang; Qiankun Chang; Junchi Lu; Jingyue Yang. 2018. "A criterion for non-voltage directional elements applied in AC networks connected with VSC-based interconnection devices." IEEJ Transactions on Electrical and Electronic Engineering 13, no. 4: 587-594.

Journal article
Published: 02 March 2018 in Energies
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A DC cable short-circuit fault is the most severe fault type that occurs in DC distribution networks, having a negative impact on transmission equipment and the stability of system operation. When a short-circuit fault occurs in a DC distribution network based on a voltage source converter (VSC), an in-depth analysis and characterization of the fault is of great significance to establish relay protection, devise fault current limiters and realize fault location. However, research on short-circuit faults in VSC-based low-voltage DC (LVDC) systems, which are greatly different from high-voltage DC (HVDC) systems, is currently stagnant. The existing research in this area is not conclusive, with further study required to explain findings in HVDC systems that do not fit with simulated results or lack thorough theoretical analyses. In this paper, faults are divided into transient- and steady-state faults, and detailed formulas are provided. A more thorough and practical theoretical analysis with fewer errors can be used to develop protection schemes and short-circuit fault locations based on transient- and steady-state analytic formulas. Compared to the classical methods, the fault analyses in this paper provide more accurate computed results of fault current. Thus, the fault location method can rapidly evaluate the distance between the fault and converter. The analyses of error increase and an improved handshaking method coordinating with the proposed location method are presented.

ACS Style

Shi-Min Xue; Chong Liu. Line-to-Line Fault Analysis and Location in a VSC-Based Low-Voltage DC Distribution Network. Energies 2018, 11, 536 .

AMA Style

Shi-Min Xue, Chong Liu. Line-to-Line Fault Analysis and Location in a VSC-Based Low-Voltage DC Distribution Network. Energies. 2018; 11 (3):536.

Chicago/Turabian Style

Shi-Min Xue; Chong Liu. 2018. "Line-to-Line Fault Analysis and Location in a VSC-Based Low-Voltage DC Distribution Network." Energies 11, no. 3: 536.

Journal article
Published: 21 July 2017 in Energies
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Flexible direct current (DC) transmission network technology is an effective method for large capacity clean energy access to power grids, but the DC short-circuit fault detection for it is a difficult problem. In this paper, the pole-to-ground fault transient characteristics in a multi-terminal DC power grid, based on overhead transmission lines and DC circuit breakers, are analyzed firstly. Then, a fast protection scheme is proposed according to the fault transient characteristics. Only local information is utilized for fault detection and location in the proposed scheme. Moreover, the scheme is verified to have the advantages of fast action speed, high reliability and the ability to resist the transition resistance. A four terminal DC power grid model based on actual engineering parameters is established in PSCAD/EMTDC, and the validity of the protection scheme under different fault conditions is verified by simulation results.

ACS Style

Shimin Xue; Jie Lian; Jinlong Qi; Boyang Fan. Pole-to-Ground Fault Analysis and Fast Protection Scheme for HVDC Based on Overhead Transmission Lines. Energies 2017, 10, 1059 .

AMA Style

Shimin Xue, Jie Lian, Jinlong Qi, Boyang Fan. Pole-to-Ground Fault Analysis and Fast Protection Scheme for HVDC Based on Overhead Transmission Lines. Energies. 2017; 10 (7):1059.

Chicago/Turabian Style

Shimin Xue; Jie Lian; Jinlong Qi; Boyang Fan. 2017. "Pole-to-Ground Fault Analysis and Fast Protection Scheme for HVDC Based on Overhead Transmission Lines." Energies 10, no. 7: 1059.

Journal article
Published: 08 September 2016 in Energies
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The three-phase four-leg inverter can produce balanced voltages even with unbalanced loads, yet its controller design is quite complicated. Based on the analysis on time domain equations, a decoupled sequence control strategy for the three-phase four-leg inverter in a low-voltage network is proposed. A negative sequence controller and a zero sequence controller are added to the control strategy besides the positive sequence controller. Furthermore, considering the output limit of the inverter, a current limit design scheme is raised through the analysis on each sequence current in synchronous rotating frame. In the case of asymmetry, the limit value of each sequence current can be adjusted dynamically according to the design scheme. The output currents in each sequence can be controlled and limited for different purposes respectively. Finally, simulation results based on PSCAD/EMTDC V4.5.0 verify the validity of the control strategy.

ACS Style

Botong Li; Jianfei Jia; Shimin Xue. Study on the Current-Limiting-Capable Control Strategy for Grid-Connected Three-Phase Four-Leg Inverter in Low-Voltage Network. Energies 2016, 9, 726 .

AMA Style

Botong Li, Jianfei Jia, Shimin Xue. Study on the Current-Limiting-Capable Control Strategy for Grid-Connected Three-Phase Four-Leg Inverter in Low-Voltage Network. Energies. 2016; 9 (9):726.

Chicago/Turabian Style

Botong Li; Jianfei Jia; Shimin Xue. 2016. "Study on the Current-Limiting-Capable Control Strategy for Grid-Connected Three-Phase Four-Leg Inverter in Low-Voltage Network." Energies 9, no. 9: 726.

Journal article
Published: 25 May 2016 in Energies
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Voltage source converter (VSC)-based high voltage direct current (VSC-HVDC) interconnectors can realize accurate and fast control of power transmission among AC networks, and provide emergency power support for AC networks. VSC-HVDC interconnectors bring exclusive fault characteristics to AC networks, thus influencing the performance of traditional protections. Since fault characteristics are related to the control schemes of interconnectors, a fault ride-through (FRT) strategy which is applicable to the interconnector operating characteristic of working in four quadrants and capable of eliminating negative-sequence currents under unbalanced fault conditions is proposed first. Then, the additional terms of measured impedances of distance relays caused by fault resistances are derived using a symmetrical component method. Theoretical analysis shows the output currents of interconnectors are controllable after faults, which may cause malfunctions in distance protections installed on lines emanating from interconnectors under the effect of fault resistances. Pilot protection is also inapplicable to lines emanating from interconnectors. Furthermore, a novel pilot protection principle based on the ratio between phase currents and the ratio between negative-sequence currents flowing through both sides is proposed for lines emanating from the interconnectors whose control scheme aims at eliminating negative-sequence currents. The validity of theoretical analysis and the protection principle is verified by PSCAD/EMTDC simulations.

ACS Style

Shimin Xue; Jingyue Yang; Yanxia Chen; Cunping Wang; Zhe Shi; Miao Cui; Botong Li. The Applicability of Traditional Protection Methods to Lines Emanating from VSC-HVDC Interconnectors and a Novel Protection Principle. Energies 2016, 9, 400 .

AMA Style

Shimin Xue, Jingyue Yang, Yanxia Chen, Cunping Wang, Zhe Shi, Miao Cui, Botong Li. The Applicability of Traditional Protection Methods to Lines Emanating from VSC-HVDC Interconnectors and a Novel Protection Principle. Energies. 2016; 9 (6):400.

Chicago/Turabian Style

Shimin Xue; Jingyue Yang; Yanxia Chen; Cunping Wang; Zhe Shi; Miao Cui; Botong Li. 2016. "The Applicability of Traditional Protection Methods to Lines Emanating from VSC-HVDC Interconnectors and a Novel Protection Principle." Energies 9, no. 6: 400.

Journal article
Published: 26 May 2015 in Energies
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A DC distribution system, which is suitable for access to distributed power generation and DC loads, is one of the development directions in power systems. Furthermore, it could greatly improve the energy efficiency and reduce the loss of power transportation. The huge short circuit current is always a great threat to the safety of the components, especially the capacitors and diodes. A resistive superconductive fault current limiter (SFCL), which could respond quickly once a fault happens and limit the fault current to a relatively low level, becomes a good solution to this problem. In this paper, the operational principle of the resistive SFCL is introduced first, and then, the DC short-circuit fault characteristic of the DC distribution system with the SFCL is analyzed and the effectiveness of the SFCL verified. In order to realize the selectivity of the protection in the DC distribution system with SFCL, a new transient current protection principle based on Ip (the peak value of the current) and tp (the transient time that the current takes to reach its peak value) is proposed. Finally, a model of a 10-kV DC distribution system with an SFCL is established and simulated in PSCAD/METDC. Simulation results have demonstrated the validity of the analysis and protection principle.

ACS Style

Shimin Xue; Feng Gao; Wenpeng Sun; Botong Li. Protection Principle for a DC Distribution System with a Resistive Superconductive Fault Current Limiter. Energies 2015, 8, 4839 -4852.

AMA Style

Shimin Xue, Feng Gao, Wenpeng Sun, Botong Li. Protection Principle for a DC Distribution System with a Resistive Superconductive Fault Current Limiter. Energies. 2015; 8 (6):4839-4852.

Chicago/Turabian Style

Shimin Xue; Feng Gao; Wenpeng Sun; Botong Li. 2015. "Protection Principle for a DC Distribution System with a Resistive Superconductive Fault Current Limiter." Energies 8, no. 6: 4839-4852.