Considering variations of network topology in optimal relay coordination using time-current-voltage characteristic

Bayati, Navid; Dadkhah, Akbar; Sadeghi, S.H.H.; Vahidi, B.; Milani, Ali Eftekhari

doi:10.1109/eeeic.2017.7977810

Cited by 20 publications

(14 citation statements)

References 11 publications

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“…Also, in the overload conditions, the value of current can be increased to a higher value than IN , which causes maloperation of protection devices. In the protection standards of AC systems, it is mentioned that 20% more than the overload current should be determined as a fault condition [22]. Therefore, to reduce the computational burden, the value of z is considered 20% more than the normal conditions, and the presence of u, which is the step function, causes to make a zero DSPI for currents less than z.…”

Section: A Calculation Of Dspimentioning

confidence: 99%

A Localized–Protection Scheme for Ring DC Microgrids using Distribution-Sensitive Poverty Index

Bayati

Aghaee

Hajizadeh

et al. 2021

2021 12th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC)

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DC Microgrid protection is one of the challenges in utilizing DC Microgrids. This paper offers a protection scheme for DC Microgrids with ring configuration by using local intelligent electronic devices. This method is based on monitoring the distribution-sensitive poverty index, which is calculated by using the current in different sample times. Moreover, this protection method only uses the local data at the intelligent electronic devices without using any communication links; thus, it increases the reliability and also decreases the cost of the protection system. In addition, the proposed scheme is capable of detecting the high impedance faults within the DC Microgrid lines. The effectiveness of the proposed strategy is demonstrated by using simulations in different scenarios. Simulation results indicate that the proposed method can detect both low and high impedance faults within several milliseconds, and the comparison with other fault detection methods reveals the superiority of the proposed strategy.

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Section: A Calculation Of Dspimentioning

confidence: 99%

A Localized–Protection Scheme for Ring DC Microgrids using Distribution-Sensitive Poverty Index

Bayati

Aghaee

Hajizadeh

et al. 2021

2021 12th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC)

Self Cite

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“…Also, the current based relays with the characteristic curve of Fig. 4 are implemented in DC Microgrids [24]. And, the fast operation curve of these relays is adjusted to be under the fuse curve.…”

Section: Fuse1mentioning

confidence: 99%

A Fuse Saving Scheme for DC Microgrids With High Penetration of Renewable Energy Resources

et al. 2020

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The high penetration of renewable energy resources (RERs) increases the fault current level of direct current (DC) microgrids and causes bidirectional flow for fault current. Therefore, it may cause a miscoordination between fuses or other protection devices. The traditional coordination methods are based on shifting the operation curve of protection devices below the characteristic curve of the fuses during temporary faults to save fuses. However, in case of low variations of the system topology and low impedance faults, these methods can be used to save fuses. Also, in the case of high penetration of RERs, due to the variations of the short circuit level, the traditional methods are not effective. On the other hand, due to the lack of standards and proper protection methods in the DC microgrids, presenting a recloser switchfuse coordination scheme for DC microgrids is essential. To address these issues, this paper proposes a fuse saving method by finding the appropriate setting of fuses and the recloser switch, which is effective for DC microgrids with various types and penetration levels of RERs. The proposed protection method is localized, and without communication links, it is applicable for both digital and conventional protection devices installed in the DC microgrids. The proposed scheme formulates the fuse-recloser switch coordination challenge as a curve-fitting problem and solves this problem to obtain the settings of the digital recloser switch and fuse. The proposed strategy provides a robust setting for fuse and digital recloser switch by considering different topologies of the DC microgrids. The proposed method is applied to a DC microgrid in different scenarios. The effectiveness and robustness of the proposed method are illustrated by digital time-domain simulation studies in the MATLAB/Simulink software environment and comparisons with previously-reported protection strategies.

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“…However, today, the voltage value can also be used to diagnose the faulty part of the power system due to the fact that directional overcurrent relays (DOCRs) have generally become more accessible and are able to measure both current and voltage values on the line which they are connected to via current and voltage transformers. The previous research showed that this feature of the DOCRs creates an opportunity for the application of N-SCs which are formed not only by taking into account the current but also the voltage value [48,49,50,10]. Some researchers have suggested to make use of voltage measurements by adding a voltage parameter to the SCs in order to mitigate the effects caused by DG connection, MG concept, etc., while others have suggested to use admittance based characteristics provided that the inverse time characteristic is preserved.…”

Section: Non-standard Characteristics Including Electrical Magnitudesmentioning

confidence: 99%

“…Another significant feature of this study was that it constituted an example of the application of a non-standard approach regarding protection requirements at the transmission level, in contrast with the majority of the studies that have focused merely on distribution systems. Equation (5) was also tested under changing network topologies following power system outages in [50].…”

Section: Voltage Based Characteristicsmentioning

confidence: 99%

Power system protection with digital overcurrent relays: A review of non-standard characteristics

Kiliçkiran

Şengör

Akdemir

et al. 2018

Electric Power Systems Research

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Considering variations of network topology in optimal relay coordination using time-current-voltage characteristic

Cited by 20 publications

References 11 publications

A Localized–Protection Scheme for Ring DC Microgrids using Distribution-Sensitive Poverty Index

A Localized–Protection Scheme for Ring DC Microgrids using Distribution-Sensitive Poverty Index

A Fuse Saving Scheme for DC Microgrids With High Penetration of Renewable Energy Resources

Power system protection with digital overcurrent relays: A review of non-standard characteristics

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