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

Sumei Liu,Zhongqing Li,Peng Zhang,Zepeng Wang,Hao Zhang

doi:10.3390/en15010229

Sumei Liu, Zhongqing Li + Show 3 more

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https://doi.org/10.3390/en15010229

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Abstract

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.

Highlights

IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
The fault current contribution of a PV power station is described by the detailed model composed of each PV generation unit (PVGU) and its collection system [3,4], the model is too complicated to derive a theoretical expression for calculating the fault current contributions [5]
In order to distinguish the current contributions from different PVGUs installed in a PV power station, the PVGUs’ fault behaviors are studied in the section

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. With the increasing capacity of grid-connected photovoltaic (PV) power stations, the fault current characteristics of a power grid are greatly altered. Traditional theory cannot be used for explaining the fault current characteristics of a PV power station [1,2]. The fault current contribution of a PV power station is described by the detailed model composed of each PV generation unit (PVGU) and its collection system [3,4], the model is too complicated to derive a theoretical expression for calculating the fault current contributions [5]

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