Abstract
Recently, the energy demand and supply situation in the Republic of Korea (ROK) has been largely affected by the fluctuations in the energy markets around the world. Such a situation has provided a basis for requiring improvements to power plant facilities. The automatic generator voltage control systems in large-scale power plants are adopting a rapid-response static excitation method to improve the transient stability. A domestic commercially developed large-scale triple-redundant excitation system is currently operated by the 1000 MW-class nuclear power plant and its efficiency has been verified at the same site. However, such a system is too costly for smaller power plants so that a reliable and low-cost redundant digital excitation control system was developed and introduced in this study to resolve the cost problem. The system has improved its stability and reliability at the same time through double (redundant) configuration. Additionally, the system’s performance was put to the test by conducting a series of control function tests after applying it to the gas turbine used in a thermal power station. This study includes the development of system hardware, simulations as well as on-site experiments and each element was validated as a result. Also, the study discusses and validates the method used for replacing the protective relays at the Kanudi power plant operating in Papua New Guinea. The replacement of 27 and 81 protective relays at the existing power plant was carried out as they did not function properly. New relays were installed after removing the power supply in the existing panel. The individual power output sections of new relays were connected in parallel with the existing properly functioning relays, as previous protective relays had only allowed monitoring without outputting the contents. Thus, the new protective system was designed to enable both existing and new relays to carry out the detection function. It was validated that the replacement was successful. The new system with the new relays is performing properly by protecting its power generator and preventing further accidents.
Highlights
The 4th Industrial Revolution has been a widely discussed issue in the last few years and the subjects pertaining to current electric power supply systems are foundational to it
The contribution of this study is that simulations were performed for an excitation control system first to complete the framework
The algorithm and solution for controlling the excitation system by transmitting the necessary signals to the rectifier after performing a calculation based on the input values of generator voltage, field voltage, and current have been developed with the C language
Summary
The 4th Industrial Revolution has been a widely discussed issue in the last few years and the subjects pertaining to current electric power supply systems are foundational to it. The emergency diesel generator is a core facility for supplying power to cooling pumps/fans critical in cooling reactors at power stations including nuclear power plants It automatically kicks in as soon as the reactor stops. The smart home and the smart grid are giving them every chance to develop, test, and implement their cutting-edge technologies, introducing all sorts of related hardware on the market Based on this situation, several electronics, communication, and power companies are showing an interest in constructing an IoT-oriented power plant and pursuing technological feasibility [4,5]. Necessary parts are hard to find and costly Another major problem is that domestic engineers cannot deal with the serious problems in those old foreign-made systems so that the power company has to bring technicians from abroad to fix the problem. We have developed a reliable and low-cost redundant digital excitation system to solve such problems
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