Next Article in Journal
Reliability Assessment of Power Systems with Photovoltaic Power Stations Based on Intelligent State Space Reduction and Pseudo-Sequential Monte Carlo Simulation
Next Article in Special Issue
Fully-distributed Load Frequency Control Strategy in an Islanded Microgrid Considering Plug-In Electric Vehicles
Previous Article in Journal
Dual Enhancement of Power System Monitoring: Improved Probabilistic Multi-Stage PMU Placement with an Increased Search Space & Mathematical Linear Expansion to Consider Zero-Injection Bus
Previous Article in Special Issue
Development of Reclosing Method in a Distribution System with Distributed Generation and Battery Energy Storage System
Open AccessArticle

Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection

1
College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
2
Nanjing SAC Power Grid Automation Co., Ltd., Nanjing 211100, China
*
Author to whom correspondence should be addressed.
Energies 2018, 11(6), 1430; https://doi.org/10.3390/en11061430
Received: 5 May 2018 / Revised: 30 May 2018 / Accepted: 1 June 2018 / Published: 3 June 2018
(This article belongs to the Special Issue Electric Power Systems Research 2018)
This paper presents a novel third harmonic voltage differential stator grounding protection (THV-DSGP) method combining the adaptive coefficient and fixed coefficient. It can solve the protection sensitivity degradation problem when the insulation resistance of stator winding to ground is slowly declining. This protection method retains the advantages of the adaptive coefficient, which is to maintain high sensitivity in case of an instantaneous ground fault. Moreover, the fixed coefficient can remember the initial insulation state of the stator winding and prevent relay failure when the stator insulation is slowly declining. In addition, due to zero-sequence voltage disconnection (ZSVD) often leading to malfunctioning of the THV stator ground protection, the existing criterion of the ZSVD was improved according to the electrical characteristics of the generator when ZSVD happens. THV-DSGP with both adaptive coefficient and fixed coefficient was simulated in the Matlab/Simulink. The simulation results show that the proposed protection can be applied to the slow ground fault of the stator winding. Furthermore, the improved criterion of ZSVD can effectively distinguish the stator metal earth fault and the secondary loop break of the zero-sequence voltage. View Full-Text
Keywords: adaptive coefficient; fixed coefficient; third harmonic voltage; stator ground protection; sensitivity; differential; simulation adaptive coefficient; fixed coefficient; third harmonic voltage; stator ground protection; sensitivity; differential; simulation
Show Figures

Figure 1

MDPI and ACS Style

Zhu, Y.; Li, Y.; Sang, J.; Bao, M.; Zang, H. Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection. Energies 2018, 11, 1430. https://doi.org/10.3390/en11061430

AMA Style

Zhu Y, Li Y, Sang J, Bao M, Zang H. Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection. Energies. 2018; 11(6):1430. https://doi.org/10.3390/en11061430

Chicago/Turabian Style

Zhu, Ying; Li, Yuping; Sang, Jianbin; Bao, Minglei; Zang, Haixiang. 2018. "Analysis and Improvement of Adaptive Coefficient Third Harmonic Voltage Differential Stator Grounding Protection" Energies 11, no. 6: 1430. https://doi.org/10.3390/en11061430

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop