Mathematical Morphology-Based Fault Data Self-Synchronization Method for Differential Protection in Distribution Networks

Zhou, Chenghan; Zou, Guibin; Zhang, Shuo; Zheng, Maoran; Tian, Junyang; Du, Tao

doi:10.1109/tsg.2022.3224210

Cited by 17 publications

(5 citation statements)

References 42 publications

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“…However, the proposed differential protection scheme provides some of the benefits which are not usual for classical differential relays, particularly the low communication burden. This is the key advantage of this method in comparison to the well-known differential methods like [11][12][13][14][15], [29][30][31][32][33] and [34,35].…”

Section: Discussion: Comparison With Established Microgrid Protection...mentioning

confidence: 96%

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Improved Differential Based Protection Scheme for Renewable Energy Based Microgrids With Low Communication Burden

Alizadeh,

Arani

2024

IEEE Access

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Due to prevalence of distributed energy resources, especially inverter interfaced ones, conventional protection systems meet substantial challenges for fault detection. Differential protection is the most reliable protection method for current networks; however, the conventional method leads to high communication burden. We propose a new differential protection based on disturbance detection and positive phase angle differences. The disturbance detection method is proposed based on Mathematical Morphology which has high speed and accuracy. Instead of transmitting the instantaneous values or the phasor of the currents which impose high communication burden on the network, the phase angle of the current is the only data which is transmitted when a sudden change is detected. The proposed method reduces the communication burden significantly and increases the resiliency of the protection scheme. The effectiveness of the proposed method is verified in modified IEEE 9 bus 3 machine network with three distributed energy resources. PSCAD is used to simulate the microgrid and the proposed method is implemented in MATLAB. It is proved that this method works properly in both islanded and grid connected modes and despite significant changes in the grid. The robustness of method in presence of noise and its high reliability and dependability is verified through various simulation case studies.

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Section: Discussion: Comparison With Established Microgrid Protection...mentioning

confidence: 96%

“…The principle of differential protection in microgrid is presented in [29]. The concerns about timing error of this method are addressed in [30,31]. Methods based on phase angle difference of superimposed complex power [32] and superimposed current difference [33] are proposed for fault detection.…”

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confidence: 99%

Improved Differential Based Protection Scheme for Renewable Energy Based Microgrids With Low Communication Burden

Alizadeh,

Arani

2024

IEEE Access

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“…In addition, the flexible access of IIDGs, including the T-connection and bus-connection in the protection zone, will decrease the reliability and sensitivity of the conventional CDP [27] and could trigger process failure, while the proposed method can adapt to the flexible access of IIDGs with different output powers and locations, as shown in Tables 6 and 7, with good practicality and performance. In particular, the technique applied in this paper has low arithmetic complexity compared to those heuristic algorithms [22,26]. The noteworthy transient feature shown in Figures 8 and 9 is used to identify faults in DNs with IIDGs.…”

Section: Discussionmentioning

confidence: 99%

“…A time-graded CDP method is proposed to achieve the coordination effectively, with lateral protection devices in the post-fault DN topology [24]. CDP approaches with improved fault data self-synchronization are proposed in radial DNs with IIDGs [25,26]. A virtual multi-terminal CDP methodology is implemented via the simultaneous exchange of remote and local currents [27].…”

Section: State Of the Artmentioning

confidence: 99%

A Current Differential Protection Scheme for Distribution Networks with Inverter-Interfaced Distributed Generators Considering Delay Behaviors of Sequence Component Extractors

Wang,

Huang,

Bai

et al. 2023

Electronics

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The high-level proliferation of inverter-interfaced distributed generators (IIDGs) in modern distribution networks (DNs) has changed system topologies and fault current signatures, which compromises the protective relays in DNs. Investigating IIDG fault behaviors-based protection scheme will benefit the grid’s safety and stability. This paper proposes a novel current differential protection (CDP) scheme that considers the delay behaviors of positive- and negative-sequence component extractors for IIDGs in DNs. A frequency-domain analytical model of the fault current for a grid-connected IIDG with the PQ control strategy and a low-voltage ride-through (LVRT) capability is investigated. The dynamic behavior of the IIDGs considering the sequence-component extractor based on the Pade approximation is presented, where the T/4 delay extractor of the IIDGs causes a two-stage behavior in the fault transient process. It is found that a 5 ms error between the measured and actual values after the fault will affect the transient characteristics of the IIDGs. The transient current generated by the IIDGs during grid faults contains a large number of low-order harmonic components within the range of 0–200 Hz, which is significantly different to the current provided by the power grid. Therefore, the proposed CDP scheme uses protective relays at both terminals to obtain the required transient electric quantity using the Prony method. By constructing the frequency-characteristics ratio (FCR) and the exchanging FCR between two terminal relays, the developed protection criteria are implemented. The accuracy of the fault analysis method, whose maximum computational error is below 0.1%, and the feasibility of the proposed protection scheme are demonstrated by using a 10 kV DN in a PSCAD/EMTDC simulation, which can be applied to various fault conditions and traditional DNs without IIDGs.

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“…The protection mechanism is initiated when the abrupt change in voltage and current on both sides of the circuit exceeds a predetermined threshold. To enhance the responsiveness and sensitivity of the protection startup, the criteria for phase voltage mutation and phase current mutation are utilized as triggering conditions, as depicted in Equation ( 20) [23,46,47]:…”

Section: Overall Process Of Fault Identificationmentioning

confidence: 99%

Enhancing Resilience and Reliability of Active Distribution Networks through Accurate Fault Location and Novel Pilot Protection Method

Xu,

Fan,

Zhang

et al. 2023

Energies

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The integration of distributed generation (DG) into the decentralized access of the distribution network transforms the existing structure into an active distribution network. The alteration in fault characteristics poses significant challenges to the coordinated operation of relay protection. Fault location within the distribution network plays a vital role in facilitating fault recovery and enhancing the resilience of the power system. It proves instrumental in improving the network’s ability to withstand extreme disasters, thereby enhancing the reliability of power distribution. Therefore, this paper provides a detailed analysis of the voltage fault components occurring during various fault types within an active distribution network. Building upon the identified characteristics of voltage fault components, a novel approach for the longitudinal protection of active distribution networks is proposed. This method involves comparing the calculated values of voltage fault components with their actual values. The proposed approach is applicable to various fault scenarios, including short-circuit faults, line break faults, and recurring faults. It exhibits advantages such as insensitivity to the penetration of distributed power supplies and robustness in withstanding transition resistance. The simulation results validate the effectiveness of the proposed method, affirming its applicability to diverse protection requirements within active distribution networks.

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Mathematical Morphology-Based Fault Data Self-Synchronization Method for Differential Protection in Distribution Networks

Cited by 17 publications

References 42 publications

Improved Differential Based Protection Scheme for Renewable Energy Based Microgrids With Low Communication Burden

Improved Differential Based Protection Scheme for Renewable Energy Based Microgrids With Low Communication Burden

A Current Differential Protection Scheme for Distribution Networks with Inverter-Interfaced Distributed Generators Considering Delay Behaviors of Sequence Component Extractors

Enhancing Resilience and Reliability of Active Distribution Networks through Accurate Fault Location and Novel Pilot Protection Method

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