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Energies 2017, 10(11), 1910; doi:10.3390/en10111910

Ground-Fault Characteristic Analysis of Grid-Connected Photovoltaic Stations with Neutral Grounding Resistance

1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering of Chongqing University, Shapingba District, Chongqing 400044, China
2
Maintenance Branch of Chongqing Electric Power Company of (State Grid), No. 12 Zhongshan Road, Yuzhong District, Chongqing 400015, China
3
Electric Power Research Institute of Chongqing Electric Power Company of (State Grid), Chongqing 401120, China
*
Author to whom correspondence should be addressed.
Received: 19 October 2017 / Revised: 9 November 2017 / Accepted: 15 November 2017 / Published: 20 November 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

A centralized grid-connected photovoltaic (PV) station is a widely adopted method of neutral grounding using resistance, which can potentially make pre-existing protection systems invalid and threaten the safety of power grids. Therefore, studying the fault characteristics of grid-connected PV systems and their impact on power-grid protection is of great importance. Based on an analysis of the grid structure of a grid-connected PV system and of the low-voltage ride-through control characteristics of a photovoltaic power supply, this paper proposes a short-circuit calculation model and a fault-calculation method for this kind of system. With respect to the change of system parameters, particularly the resistance connected to the neutral point, and the possible impact on protective actions, this paper achieves the general rule of short-circuit current characteristics through a simulation, which provides a reference for devising protection configurations. View Full-Text
Keywords: neutral grounding resistance; grid-connected PV station; fault model; fault characteristic neutral grounding resistance; grid-connected PV station; fault model; fault characteristic
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Li, Z.; Lu, J.; Zhu, Y.; Jiang, W. Ground-Fault Characteristic Analysis of Grid-Connected Photovoltaic Stations with Neutral Grounding Resistance. Energies 2017, 10, 1910.

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