Novel Protection Scheme for Ring DC Microgrids

2021 ◽  
Author(s):  
Weiliang Zhang ◽  
Hui Zhang ◽  
Na Zhi
Keyword(s):  
Dc Microgrids ◽  
Protection Scheme

scholarly journals Multi-Sample Differential Protection Scheme in DC Microgrids

2020 ◽  
pp. 1-1
Author(s):  
Chunpeng Li ◽  
Puran Rakhra ◽  
Patrick Norman ◽  
Graeme Burt ◽  
Paul Clarkson
Keyword(s):  
Differential Protection ◽  
Dc Microgrids ◽  
Protection Scheme

scholarly journals Fault distance estimation-based protection scheme for DC microgrids

2019 ◽  
Vol 2019 (16) ◽  
pp. 1199-1203 ◽  
Author(s):  
Lin Zhang ◽  
Nengling Tai ◽  
Wentao Huang ◽  
Yanhong Wang
Keyword(s):  
Distance Estimation ◽  
Dc Microgrids ◽  
Protection Scheme

scholarly journals Differential Evolution-Based Overcurrent Protection for DC Microgrids

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5026
Author(s):  
Miao Li ◽  
Daming Zhang ◽  
Shibo Lu ◽  
Xiuhui Tang ◽  
Toan Phung
Keyword(s):  
Differential Evolution ◽  
Case Studies ◽  
Load Condition ◽  
System Size ◽  
Performance Criterion ◽  
Dc Microgrid ◽  
Dc Microgrids ◽  
Protection Scheme ◽  
De Algorithm ◽  
Overcurrent Protection

DC microgrids have advantages over AC microgrids in terms of system efficiency, cost, and system size. However, a well-designed overcurrent protection approach for DC microgrids remains a challenge. Recognizing this, this paper presents a novel differential evolution (DE) based protection framework for DC microgrids. First, a simplified DC microgrid model is adopted to provide the analytical basis of the DE algorithm. The simplified model does not sacrifice performance criterion in steady-state simulation, which is verified through extensive simulation studies. A DE-based novel overcurrent protection scheme is then proposed to protect the DC microgrid. This DE method provides an innovative way to calculate the maximum line current, which can be used for the overcurrent protection threshold setting and the relay coordination time setting. The detailed load condition and solar irradiance for each bus can be obtained by proposed DE-based method. Finally, extensive case studies involving faults at different locations are performed to validate the proposed strategy’s effectiveness. The expandability of the proposed DE-based overcurrent protection framework has been confirmed by further case studies in seven bus mesh systems.

scholarly journals Integrated Control and Protection Architecture for Islanded PV-Battery DC Microgrids: Design, Analysis and Experimental Verification

2020 ◽  
Vol 10 (24) ◽  
pp. 8847
Author(s):  
Ali Abdali ◽  
Kazem Mazlumi ◽  
Josep M. Guerrero
Keyword(s):  
Fault Detection ◽  
Integrated Control ◽  
Storage System ◽  
Energy Storage System ◽  
Detection Algorithm ◽  
Dc Microgrid ◽  
Dc Microgrids ◽  
Protection Scheme ◽  
Bus Voltage ◽  
Battery Energy

Direct current (dc) microgrids have gained significant interest in research due to dc generation/storage technologies—such as photovoltaics (PV) and batteries—increasing performance and reducing in cost. However, proper protection and control systems are critical in order to make dc microgrids feasible. This paper aims to propose a novel integrated control and protection scheme by using the state-dependent Riccati equation (SDRE) method for PV-battery based islanded dc microgrids. The dc microgrid under study consists of photovoltaic (PV) generation, a battery energy storage system (BESS), a capacitor bank and a dc load. The aims of this study are fast fault detection and voltage control of the dc load bus. To do so, the SDRE observer-controller—a nonlinear mathematical model—is employed to model the operation of the dc microgrid. Simulation results show that the proposed SDRE method is effective for fault detection and robust against external disturbances, resulting in it being capable of controlling the dc load bus voltage during disturbances. Finally, the dc microgrid and its proposed protection scheme are implemented in an experimental testbed prototype to verify the fault detection algorithm feasibility. The experimental results indicate that the SDRE scheme can effectively detect faults in a few milliseconds.

A reliable islanding identification mechanism for DC microgrid using PCC transient signal

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Satyavarta Kumar Prince ◽  
Kaibalya Prasad Panda ◽  
Shaik Affijulla ◽  
Gayadhar Panda
Keyword(s):  
Circuit Breaker ◽  
Rate Of Change ◽  
Transient Signal ◽  
Test Cases ◽  
Detection Zone ◽  
Dc Microgrid ◽  
Dc Microgrids ◽  
Protection Scheme ◽  
Point Of Common Coupling ◽  
Current Sampling

Abstract The islanding detection is a major problem for both AC and DC Microgrids. Failure to do so may result in problems such as system instability, increased non-detection zone, out-of-phase reclosing, personnel safety, and power quality deterioration. To address this issue, this paper presents a reliable island identification method for DC Microgrids that employs a Cumulative Sum of Rate of change of Voltage (CSROCOV) to reduce the non-recognition region. The proposed islanding protection scheme employs point of common coupling (PCC) transient signal to detect islands events. The voltage, power, and current sampling are accumulated from the PCC of the distributed generation terminals. The proposed scheme detects islanding in three test cases with varying power mismatching conditions, while non-islanding events are classified as capacitor switching and faults. The system is modelled and simulated in the MATLAB/Simulink environment, then islanding conditions are applied by turning off the main circuit breaker. Simulation results are presented to verify the methodology under different test cases. The robustness of the proposed scheme is also validated against measurement noise.

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