scholarly journals LS-Solar-PV System Impact on Line Protection

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 226 ◽  
Author(s):  
Qais Alsafasfeh ◽  
Omar Saraereh ◽  
Imran Khan ◽  
Sunghwan Kim
Keyword(s):  
Large Scale ◽  
Fault Current ◽  
Power Station ◽  
Power Fluctuation ◽  
Phase Selection ◽  
Phase Current ◽  
Photovoltaic Power ◽  
Current Characteristics ◽  
Current Difference ◽  
Component Phase

Large-scale photovoltaic power station access to the grid will profoundly change the fault current characteristics of the power station’s outgoing lines. This change results in adaptive problems in traditional protection phase selection components, which may cause incorrect actions in reclosing, protection ranging, and distance protection. Based on the fault current characteristics of the large-scale photovoltaic power station transmission line, this paper analyzes the adaptability of the phase current difference mutation and the sequence component phase selection component in protecting the Photovoltaic (PV) power plant side of the transmission line. Based on the fault current analytical formula, the phase relationship between the phase current difference and the current sequence component under different control targets, such as suppressing negative sequence current, suppressing the active power fluctuation, and suppressing the reactive power fluctuation, is derived. The operational performances of the phase–phase current difference of the abrupt phase selection component and the sequence component phase selection component of the power station side are degraded, which may cause incorrect operation of the phase selection component. Based on the actual engineering parameters of a PV power plant, a simulation model was built in Power System Computer Aided Design (PSCAD) to verify the correctness of the theoretical analysis.

scholarly journals Equivalent Model of Photovoltaic Power Station Considering Different Generation Units’ Fault Current Contributions

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 229
Author(s):  
Sumei Liu ◽  
Hao Zhang ◽  
Peng Zhang ◽  
Zhongqing Li ◽  
Zepeng Wang
Keyword(s):  
Large Scale ◽  
Calculation Model ◽  
Equivalent Model ◽  
Theoretical Expression ◽  
Fault Current ◽  
Power Station ◽  
Power Stations ◽  
Machine Calculation ◽  
The Difference ◽  
Current Characteristics

The fault current calculation model of photovoltaic (PV) power stations is usually treated as a capacity weighted equivalent model of a single PV generation unit (PVGU). However, in the same PV power station, different PVGUs have various fault current characteristics. As a result, there are significant differences in fault current characteristics between a PVGU and a PV power station. It means that the existing capacity weighted equivalent model cannot be used for accurately describing the fault current contributions from a practical PV power station. In this paper, the fault behaviors of the PVGUs located at different access points of a PV power station are firstly analyzed. The difference in PVGUs’ fault current contributions is identified and reflected with the activation states of current limiters that are employed for PV inverters. The activation states are represented by a theoretical expression so as to distinguish the PVGUs’ fault contributions. Further, based on the proposed theoretical expression, a novel algorithm is developed for sorting all PVGUs included in a PV power station. The multi-machine calculation model is deduced in order to exactly express the fault current contribution from a PV station. Finally, some simulation tests are conducted. The tested results verify the effectiveness of the proposed calculation model. It can provide support for calculating the protection setting of power grid connected with large-scale PV stations.

Analysis of Output Characteristics of Photovoltaic System

2012 ◽  
Vol 512-515 ◽  
pp. 17-22 ◽  
Author(s):  
Xue Li Zhang ◽  
Qi Hui Liu ◽  
Bei Li ◽  
Hui Meng Ma
Keyword(s):  
Energy Storage ◽  
Large Scale ◽  
Storage System ◽  
Photovoltaic System ◽  
Generation System ◽  
Power Station ◽  
Energy Storage Devices ◽  
Photovoltaic Generation ◽  
Photovoltaic Power ◽  
Output Characteristics

The output of photovoltaic generation system is influenced by the factors such as solar radiation, temperature and so on. So the change of photovoltaic generation power is a non-stationary random process that will impact on the grid. In order to promote large-scale photovoltaic generation connected to the grid, we need to configure energy storage devices for photovoltaic power station and in order to coordinate the allocation of photovoltaic system with energy storage system, we requires a thorough understanding of output characteristics of the photovoltaic system. This paper firstly analyzes the influence brought by the large-scale photovoltaic generation system connected to the grid and then introduces the effect factors of photovoltaic output. Based on the history data of the 100 kWp photovoltaic power station and the statistical method, the paper qualitatively and quantitatively analyzes the photovoltaic output performance; finally puts forward the PV output power evaluation index. The conclusions of this study will provide powerful data references for follow-up studies and have practical value.

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