Sequence current component and its power direction‐based improved protection for spot network with DERs

Zhang, Zhihua; Crossley, P.A.; Xu, Bingyin; Yin, Mingze

doi:10.1049/iet-gtd.2016.0550

Cited by 12 publications

(6 citation statements)

References 22 publications

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“…Protection based on fault components has many advantages for analysing all types of faults, including overcoming the influence of load current, improving protection sensitivity, and so on. The limitation of PV injection in the distribution system is related to the minimum operational load [13]. In this article, the minimum load is assumed to be 0 kW.…”

Section: B Positive Sequence Current Phase-based Improved Reverse Pomentioning

confidence: 99%

“…According to [13], the equivalent network for the positive sequence fault component is as shown in Fig. 8 when the fault occurs at f.U 1 is the positive sequence voltage fault component at fault location f, İ PV is the current variation of the PV inverter,İ F1 is the positive sequence current fault component in the fault feeder,İ Fn−1 is the corresponding fault current in the normal feeders.İ PVf 1 is the current variation caused by the PV inverter in the fault feeder,İ PVfn−1 is the current variation in the normal feeders, and n is the number of feeders in the spot network.…”

Section: A Influence Of Pv Access To Reverse Power Protection Performentioning

confidence: 99%

“…Reverse power protection in the spot network is usually set to 0.1%-0.5% of the transformer capacity and does not consider the influence of injected PV [12], [13]. Thus, when PV is connected to a spot network, the traditional reverse power protection will misoperate frequently because of power fluctuations.…”

Section: Introductionmentioning

confidence: 99%

“…Reverse power protection misoperation can be actively prevented by limiting the actual output power of PV [16]. An improved reverse power protection for spot networks with PV amounts was introduced in [13] based on the current variation and the power direction of the positive sequence fault component. This approach enhances operational reliability and is helpful for improving the PV hosting capacity.…”

Section: Introductionmentioning

confidence: 99%

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Positive Sequence Current Phase-Based Improved Reverse-Power Protection and a PV Hosting Capacity Assessment Method for Spot Networks

et al. 2020

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A spot network is a special low-voltage distribution network with multiple sources supplying it in parallel. It can significantly enhance supply reliability and is beneficial for integrating a distributed energy resource (DER). However, because traditional reverse power protection in spot networks cannot identify the reverse power cause, DERs, especially photovoltaic (PV) hosting capacity, are limited. Meanwhile, no uniform method exists for assessing the PV injection capacity in spot networks. Based on comparing the positive sequence current phase, this article presents an improved reverse power protection and PV hosting capacity assessment method for spot networks. Current variation is adopted to identify the reverse power cause, and a spot network equivalent model with PV is built. The positive sequence current phase relationship at the reverse power protection location is analysed when different types of short circuit faults occur. A short circuit fault section can be determined by comparing the positive sequence current phase. The influence of the PV output current on the improved reverse power protection performance is analysed. Then, a PV hosting capacity assessment method with improved reverse power is presented based on the PV influence on protection instead of on node voltage. A simulation model based on an actual project is constructed using PSCAD software. The simulation results show that the improved reverse power protection significantly enhances the ability to inject PV into the spot network and operates correctly under faults. The theoretical PV hosting capacity agrees with the simulation results. INDEX TERMS Spot network, reverse power protection, photovoltaic, hosting capacity, assessment method.

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Section: B Positive Sequence Current Phase-based Improved Reverse Pomentioning

confidence: 99%

Section: A Influence Of Pv Access To Reverse Power Protection Performentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Positive Sequence Current Phase-Based Improved Reverse-Power Protection and a PV Hosting Capacity Assessment Method for Spot Networks

et al. 2020

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“…Very recently, a protection strategy based on sequence current components was introduced by the authors in [91] to detect the reverse power flow in spot DNs with high DG penetration. In addition, a positive sequence fault component-based pilot protection scheme is devices in [92] for the protection of closed loop DNs with DG.…”

Section: Symmetrical Componentsmentioning

confidence: 99%

Progress on Protection Strategies to Mitigate the Impact of Renewable Distributed Generation on Distribution Systems

et al. 2017

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Abstract:The benefits of distributed generation (DG) based on renewable energy sources leads to its high integration in the distribution network (DN). Despite its well-known benefits, mainly in improving the distribution system reliability and security, there are challenges encountered from a protection system perspective. Traditionally, the design and operation of the protection system are based on a unidirectional power flow in the distribution network. However, the integration of distributed generation causes multidirectional power flows in the system. Therefore, the existing protection systems require some improvement or modification to address this new feature. Various protection strategies for distribution system have been proposed so that the benefits of distributed generation can be fully utilized. This paper reviews the current progress in protection strategies to mitigate the impact of distributed generation in the distribution network. In general, the reviewed strategies in this paper are divided into: (1) conventional protection systems and (2) modifications of the protection systems. A comparative study is presented in terms of the respective benefits, shortcomings and implementation cost. Future directions for research in this area are also presented.

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Powering up microgrids: A comprehensive review of innovative and intelligent protection approaches for enhanced reliability

Alasali,

Saad,

Saidi

et al. 2023

Energy Reports

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Sequence current component and its power direction‐based improved protection for spot network with DERs

Cited by 12 publications

References 22 publications

Positive Sequence Current Phase-Based Improved Reverse-Power Protection and a PV Hosting Capacity Assessment Method for Spot Networks

Positive Sequence Current Phase-Based Improved Reverse-Power Protection and a PV Hosting Capacity Assessment Method for Spot Networks

Progress on Protection Strategies to Mitigate the Impact of Renewable Distributed Generation on Distribution Systems

Powering up microgrids: A comprehensive review of innovative and intelligent protection approaches for enhanced reliability

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