scholarly journals Study on Relay Protection of Small Hydro-power Station in Isolated Power Grid

2015 ◽  
Author(s):  
Mingzhe Cao ◽  
Genghuang Yang ◽  
Xin Su ◽  
Qingling Wang
Keyword(s):  
Power Grid ◽  
Relay Protection ◽  
Power Station ◽  
Hydro Power

Influence of V/Hz Limiter on Generator in Isolated Operation

2011 ◽  
Vol 383-390 ◽  
pp. 5066-5070
Author(s):  
Rui Lan Liu ◽  
Wei Liu ◽  
Peng Liu ◽  
Qian Dou
Keyword(s):  
Low Voltage ◽  
Power Grid ◽  
Low Frequency ◽  
Local Load ◽  
Power Station ◽  
Excitation System ◽  
Hydro Power ◽  
Time Operation ◽  
Long Time ◽  
Operation Status

The action of V/Hz limiter of generator excitation system and its influence on generator in isolated operation are analyzed with the generator in Youjiang hydro power station as an example which is in isolated operation with local load after the trip of main transformer of 500kV Baise substation in Guangxi power grid. It is pointed out that the action of V/Hz limiter is the reason that causes the long time operation of generator under low voltage and low frequency status. Suggestions on the functions of V/Hz limiter and how to avoid such low voltage and low frequency operation status are proposed.

scholarly journals Generator Assessment of Hydro Power Station Adequacy after Reconstruction from Classical to HIS SF6 Substation

2017 ◽  
Vol 7 (2) ◽  
pp. 729
Author(s):  
Srete Nikolovski ◽  
Goran Slipac ◽  
Emir Alibašić
Keyword(s):  
State Space Model ◽  
Annual Reports ◽  
Power Station ◽  
Hydro Power ◽  
Space Model ◽  
System Operator ◽  
Adequacy Assessment ◽  
High Level ◽  
Maintenance Process ◽  
Reliability And Availability

<p>Reliability analysis of substations and generator assessment of power plant stations are very important elements in a design and maintenance process. This paper presents a generator adequacy assessment of a classical “H” scheme for an open conventional substation, which is often used, and a new HIS - High Integrated Switchgear with SF6 gas isolation. Generator adequacy indices of both types of classical and HIS switchgear were compared and the results showed a high level of reliability and availability of the HIS presented substation. The input data were the annual reports of Croatian TSO-Transmission System Operator (HOPS) and statistics of operation events of Croatian National Electricity (HEP Inc.). For the HIS substation, the input reliability data were used from relevant international literature since only few of HIS substations are installed in Croatia. The generator is modelled with a three-state Markov state space model and Monte Carlo simulations were used for the generator assessment analysis. Adequacy indices LOLP and EDNS were obtained using DIgSILENT software.</p>

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