DC grids DC fault detection using asymmetric pole inductors

2021 ◽  
Vol 193 ◽  
pp. 107016
Author(s):  
Hadi Dadgostar ◽  
Masood Hajian ◽  
Khaled Ahmed
Keyword(s):  
Fault Detection ◽  
Dc Fault

DC Fault Analysis and Transient Average Current Based Fault Detection for Radial MTDC System

2020 ◽  
Vol 35 (3) ◽  
pp. 1310-1320 ◽  
Author(s):  
Jiapeng Li ◽  
Yujun Li ◽  
Liansong Xiong ◽  
Ke Jia ◽  
Guobing Song
Keyword(s):  
Fault Detection ◽  
Fault Analysis ◽  
Dc Fault ◽  
Average Current

DC Fault Detection in Meshed MTdc Systems Based on Transient Average Value of Current

2020 ◽  
Vol 67 (3) ◽  
pp. 1932-1943 ◽  
Author(s):  
Yujun Li ◽  
Jiapeng Li ◽  
Liansong Xiong ◽  
Xian Zhang ◽  
Zhao Xu
Keyword(s):  
Fault Detection ◽  
Average Value ◽  
Dc Fault

A fault detection technique based on line parameters in ring-configured DC microgrid

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Satyavarta Kumar Prince ◽  
Shaik Affijulla ◽  
Gayadhar Panda
Keyword(s):  
Fault Detection ◽  
Sudden Change ◽  
Least Square ◽  
Detection Technique ◽  
Fault Estimation ◽  
Fault Current ◽  
Dc Microgrid ◽  
Zero Crossing ◽  
Protection Scheme ◽  
Dc Fault

Abstract The integration of distributed generation (DG) units into a DC microgrid presents a research challenge in terms of a proper protection scheme. The network must be protected due to the sudden change in the amplitude and direction of the fault current. In addition, due to the absence of zero-crossing of the DC fault current, protecting the network from these potential faults is a challenging task. The DC fault can be diagnosed using an appropriate detection technique after monitoring the movement of current. In this paper, a least-square estimation (LSE) technique has been adopted, which has been proven to be able to detect the faulty line strongly, so that the fault is detected by estimated parameters. This fault detection technique has been evaluated on six-lines, with faults analyzed on each line. The six-bus DC microgrid is designed in PSS®SINCAL, and the proposed method is simulated in MATLAB. Two sets of simulations are designed to validate the reliability of the proposed method: (1) pole–ground (P–G) and (2) pole–pole (P–P) fault estimation of inductance and capacitance (C) in a separate line. Simulation results show that the proposed methodology can able to accurately detect (i.e., 95% accuracy) the faulty line in the DC microgrid with respect to designated ‘trip’ value. Thus, the proposed fault detection methodology can be utilized for protection of modern DC microgrids. An experimental PV-battery-load-based fault detection technique has been developed in the laboratory and tested under P–P fault conditions in order to validate the effectiveness of the proposed scheme.

A Fast DC Fault Detection Method Using DC Reactor Voltages in HVdc Grids

2018 ◽  
Vol 33 (5) ◽  
pp. 2254-2264 ◽  
Author(s):  
Chengyu Li ◽  
Aniruddha M. Gole ◽  
Chengyong Zhao
Keyword(s):  
Fault Detection ◽  
Detection Method ◽  
Dc Reactor ◽  
Dc Fault

scholarly journals A Fast DC Fault Detection Method for Multi-Terminal AC/DC Hybrid Distribution Network Based on Voltage Change Rate of DC Current-Limiting Inductor

Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1828 ◽  
Author(s):  
Xiaomin Qi ◽  
Wei Pei ◽  
Luyang Li ◽  
Li Kong
Keyword(s):  
Fault Detection ◽  
Detection Method ◽  
Distribution Network ◽  
Distribution Networks ◽  
Change Rate ◽  
Fault Type ◽  
Dc Fault ◽  
Voltage Change ◽  
Current Limiting ◽  
Hybrid Distribution

The rapid detection of direct current (DC) faults is one of the key technologies for the development of multi-terminal alternating current (AC)/DC hybrid distribution networks. The DC fault current rises quickly and affects the whole network. Therefore, DC faults must be detected much faster than AC faults. This paper proposes a fast DC fault detection method based on the voltage change rate of the current-limiting inductor (CLI) for the multi-terminal AC/DC hybrid distribution network. Firstly, the characteristics of the fault voltages and currents and of the CLIs are studied in detail, and the feasibility of using the voltage change rate of the CLI to detect DC fault is analyzed. Based on this, a primary fault detection method is proposed to identify the faulty line, determine the fault type and the fault poles using the amplitudes of the single-ended CLI voltage change rates. For high-resistance DC faults, a backup detection method using the directions and amplitudes of the voltage change rates of the double-ended CLIs is proposed. Finally, the proposed method is verified by MATLAB simulations. The simulation results show that the proposed method can detect all DC faults accurately, and the faulty line, fault type and fault poles can be determined quickly. The proposed method is not affected by the fault location, current-limiting inductance, power reversal of the converters, AC fault and communication delay.

scholarly journals Simulation Test of a DC Fault Current Limiter for Fault Ride-Through Problem of Low-Voltage DC Distribution

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1753 ◽  
Author(s):  
Bing Han ◽  
Yonggang Li
Keyword(s):  
Fault Detection ◽  
Low Voltage ◽  
Short Circuit ◽  
Distribution Network ◽  
Fault Current ◽  
Fault Current Limiter ◽  
Dc Fault ◽  
Fault Ride Through ◽  
Current Limiter ◽  
Short Circuit Fault

The low voltage direct current (LVDC) distribution networks are connected with too many kinds of loads and sources, which makes them prone to failure. Due to the small damping value in the DC lines, the fault signal propagates so fast that the impact current with the wave front of millisecond and the transient voltage pose great challenges for fault detection. Even worse, some faults with small currents are difficult to detect and the communication is out of sync, resulting in protection misoperation. These problems have severely affected the new energy utilization. In view of this, a DC fault current limiter (FCL) composed of inductance, resistance, and power electronic switch was designed in this paper. The rising speed of fault current can be decreased by the series inductance and the peak value of the fault current can be limited by series impedance, thus in this way the running time can be gained for fault detection and protection. For distributed energy access, by deducing the short circuit fault characteristic expression of LVDC distribution network, the feasibility of FCL was verified. Based on the structure of the bridge-type alternating current (AC) current limiter, the structure and parameters of the DC FCL were determined according to the fault ride-through target. Then, a low voltage ride-through strategy based on DC FCL was proposed for the bipolar short-circuit fault of LVDC distribution network. Finally, MATLAB/Simulink simulation was used to verify the rationality of the proposed FCL and its ride-through strategy.

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