An under and over excitation limiter implementation in a digital excitation system for synchronous generators

Since modeling and simulation are the two most effective tools that can be used in the design or analysis process, they play a vital role in developing such system. In many cases, they are the only possible means of making a safe engineering decision for a new concept of process for a large-scale system. Elsewhere, they are used as a critical element in the analysis of energy systems or to suggest a method of developing a novel and effective energy system model. Thus, in this study, simulations and test bed experiment were carried out to assess a low-power digital excitation system in order to validate its effectiveness. The excitation systems currently used by most of the power stations in the Republic of Korea were installed during the 1970s or 1980s. Unfortunately, it is difficult to seek technical assistance for them as they depend on foreign technologies, requiring a large sum to be paid when requesting one or more engineers to be dispatched. As such, technical updates have always been made by foreign companies, since it is not easy to make modifications to the system without the help of the original system developer. The technology developed in this study was designed to address such problem. The inability to conduct a test for an actual system can be solved by using a power system analysis program to analyze the characteristics of the controller. The study confirmed the system’s effectiveness, and the Test Bed was proven to be flexible and adequate for the experiment. The proposed excitation system is expected to increase the stability and economic effect of the system by optimizing existing systems. In the future, the authors plan to focus on student education by establishing an education system that allows students to learn about the digital excitation system and its simulation.

Download Full-text

Development of a digital excitation system for synchronous generator on RTAI-Linux platform

2012 International Conference on Green Technologies (ICGT) ◽

10.1109/icgt.2012.6477946 ◽

2012 ◽

Cited By ~ 1

Author(s):

M Deepak. ◽

K. N. Shubhanga

Keyword(s):

Synchronous Generator ◽

Excitation System ◽

Digital Excitation ◽

Linux Platform

Download Full-text

Simulasi Pemodelan Sistem Eksitasi Statis pada Generator Sinkron terhadap Perubahan Beban

Energi & Kelistrikan ◽

10.33322/energi.v11i2.483 ◽

2019 ◽

Vol 11 (2) ◽

pp. 46-54

Author(s):

Hastuti Azis ◽

Pawenary Pawenary ◽

Meyhart Torsna Bangkit Sitorus

Keyword(s):

Output Voltage ◽

Alpha Angle ◽

Induced Voltage ◽

Synchronous Generators ◽

Excitation Current ◽

Excitation System ◽

Dc Voltage ◽

Average Value ◽

Nominal Voltage ◽

Generator Output

Excitation system is one of the most important parts of synchronous generators, where the system functions to provide dc power to the field generator coil. Iin this study, a static excitation system consisting of transformers and connected thyristors in bridge configuration has been implemented in synchronous machines that operate as 206,1 mva capacity generators, 16,5 kv using the help of matlab simulink r2017b software. By adjusting the load given to the generator, variations in excitation currents can affect the amount of output voltage generated by the generator so that it can increase and decrease the induced voltage. In full load conditions, namely p = 175 mw, q = 100 mvar, the results of the study show that when the simulation is run at alpha 0 °, it is known that the average value of dc voltage is 496,4 v, excitation current is 1057 a and voltage generator output has increased beyond its nominal voltage of 16,72 kv. in this case, to maintain the terminal voltage, the excitation current must be reduced by increasing the angle of shooting of the thyristor to an alpha angle of 45 °, so that the average dc voltage can be reduced to 479,3 v, as well as the excitation current to 985,9 a. the generator output voltage at the alpha 45 ° angle is obtained according to its nominal value of 1,.5 kv.

Download Full-text