Incremental transient power-based protection scheme for a DC microgrid

2022 ◽  
Author(s):  
Ann Mary Joshua ◽  
K. Panduranga Vittal
Keyword(s):  
Dc Microgrid ◽  
Protection Scheme

scholarly journals Fault Detection in DC Microgrids Using Short-Time Fourier Transform

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 277
Author(s):  
Ivan Grcić ◽  
Hrvoje Pandžić ◽  
Damir Novosel
Keyword(s):  
Fourier Transform ◽  
Fault Detection ◽  
Operating Conditions ◽  
Time Signal ◽  
Short Time Fourier Transform ◽  
Dc Microgrid ◽  
Protection Scheme ◽  
Simulink Model ◽  
Battery Energy ◽  
Short Time

Fault detection in microgrids presents a strong technical challenge due to the dynamic operating conditions. Changing the power generation and load impacts the current magnitude and direction, which has an adverse effect on the microgrid protection scheme. To address this problem, this paper addresses a field-transform-based fault detection method immune to the microgrid conditions. The faults are simulated via a Matlab/Simulink model of the grid-connected photovoltaics-based DC microgrid with battery energy storage. Short-time Fourier transform is applied to the fault time signal to obtain a frequency spectrum. Selected spectrum features are then provided to a number of intelligent classifiers. The classifiers’ scores were evaluated using the F1-score metric. Most classifiers proved to be reliable as their performance score was above 90%.

Protection Scheme for DC Microgrid Distribution System

2012 ◽  
Vol 614-615 ◽  
pp. 1661-1665
Author(s):  
Ling Hui Deng ◽  
Zhi Xin Wang ◽  
Jian Min Duan
Keyword(s):  
Distribution System ◽  
Cost Efficiency ◽  
Power Flow ◽  
Low Voltage ◽  
Dc Microgrid ◽  
Protection Scheme ◽  
High Level ◽  
Bidirectional Power Flow ◽  
Efficiency And Reliability ◽  
Laboratory Prototype

The low voltage DC (LVDC) distribution system is a new concept and a promising technology to be used in the future smart distribution system having high level cost-efficiency and reliability. In this paper, a low-voltage (LV) DC microgrid protection system design is proposed. Usually, an LVDC microgrid must be connected to an ac grid through converters with bidirectional power flow and, therefore, a different protection scheme is needed. This paper describes practical protection solutions for the LVDC network and an LVDC system laboratory prototype is being experimentally tested by MATLAB/SIMULINK. The results show that it is possible to use available devices to protect such a system. But other problems may arise which needs further study.

scholarly journals Design and Line Fault Protection Scheme of a DC Microgrid Based on Battery Energy Storage System

Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1823 ◽  
Author(s):  
Abdul Howlader ◽  
Hidehito Matayoshi ◽  
Saeed Sepasi ◽  
Tomonobu Senjyu
Keyword(s):  
Energy Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Voltage Source ◽  
Battery Energy Storage System ◽  
Dc Microgrid ◽  
Battery Energy Storage ◽  
Protection Scheme ◽  
Fault Protection ◽  
Battery Energy

Currently, the Direct-Current (DC) microgrid has been gaining popularity because most electronics devices require a DC power input. A DC microgrid can significantly reduce the AC to DC energy conversion loss. However, a power grid may experience a line fault situation that may damage important household devices and cause a blackout in the power system. This work proposes a new line fault protection scheme for a DC microgrid system by using a battery energy storage system (BESS). Nowadays, the BESS is one of the most cost effective energy storage technologies for power system applications. The proposed system is designed from a distributed wind farm smart grid. A total of three off-shore wind farms provide power to the grid through a high voltage DC (HVDC) transmission line. The DC microgrid was modeled by a BESS with a bi-directional DC–DC converter, various DC-loads with step down DC–DC converters, a voltage source converter, and a voltage source inverter. Details of the control strategies of the DC microgrid are described. During the line fault situation, a transient voltage was controlled by a BESS. From the simulation analyses, it is confirmed that the proposed method can supply stable power to the DC grid, which can also ensure protection of several loads of the DC microgrid. The effectiveness of the proposed system is verified by in a MATLAB/SIMULINK® environment.

scholarly journals Single-Ended Protection Scheme for VSC-Based DC Microgrid Lines

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1440 ◽  
Author(s):  
Cheng Lv ◽  
Xiaodong Zheng ◽  
Nengling Tai ◽  
Shi Chen
Keyword(s):  
Dc Microgrid ◽  
Protection Scheme

Oscillation Frequency Component Based Protection Scheme for DC Microgrid.

2021 ◽  
pp. 1-1
Author(s):  
Sarvesh Ashokrao Wakode ◽  
Makarand S Ballal ◽  
Adil Sheikh ◽  
Rohit R Deshmukh
Keyword(s):  
Oscillation Frequency ◽  
Frequency Component ◽  
Dc Microgrid ◽  
Protection Scheme

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.

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