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Impact of midpoint STATCOM on generator 
Loss of excitation protection 
ABSTRACT: 
This project explores the impact of a transmission-line midpoint STATCOM 
on the performance of the generator loss-of-excitation (LOE) protection. In this 
context, investigations are conducted on a two-hydro generator power station for 
two LOE contingencies, namely, a complete LOE due to a field-winding short 
circuit and a partial LOE due to a sudden drop in the excitation voltage at different 
generator loadings. The results of these investigations show that the midpoint 
STATCOM has adverse impacts on the LOE distance relay in the form of delay 
time and/or under-reach phenomenon. These adverse impacts vary with the 
generator loading and the LOE mode.
BLOCK DIAGRAM 
Ac source 
CONTROLLER CIRCUIT: 
 PIC controller 
OUTPUT: 
 Hardware 
 simulation 
TOOLS: 
 MP Lab 
 Orcad/Pspice 
STATCOM 
Output 
Driver unit 
Controller 
Ac source

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JPEEE1443 Impact of Midpoint STATCOM on Generator Loss of Excitation Protection

  • 1. Impact of midpoint STATCOM on generator Loss of excitation protection ABSTRACT: This project explores the impact of a transmission-line midpoint STATCOM on the performance of the generator loss-of-excitation (LOE) protection. In this context, investigations are conducted on a two-hydro generator power station for two LOE contingencies, namely, a complete LOE due to a field-winding short circuit and a partial LOE due to a sudden drop in the excitation voltage at different generator loadings. The results of these investigations show that the midpoint STATCOM has adverse impacts on the LOE distance relay in the form of delay time and/or under-reach phenomenon. These adverse impacts vary with the generator loading and the LOE mode.
  • 2. BLOCK DIAGRAM Ac source CONTROLLER CIRCUIT:  PIC controller OUTPUT:  Hardware  simulation TOOLS:  MP Lab  Orcad/Pspice STATCOM Output Driver unit Controller Ac source