การวิเคราะห์รากของปัญหาตามเวลาจริงของระบบควบคุมกังหันน้ำสำหรับโรงไฟฟ้าพลังน้ำเขื่อนสิริกิติ์

Abstract

This research studies fault diagnosis of the governor control system for Sirikit Hydropower. The existing governor control system at Sirikit Hydropower is designed as a standalone system. It communicates with other systems, such as the distributed control system (DCS), protection system, and excitation system, through hardwiring. This system does not include a troubleshooting guide or a troubleshooting monitor. Some abnormal events generate group alarms that cause the operator and maintenance team to spend more time on problem-solving. This paper investigates real-time root cause analysis of the governor control system for Sirikit Hydropower. Implementing real-time root cause analysis can improve the performance of the operator and maintenance team, especially in emergency and ready-to-start events. The main focus of this research is real-time root cause analysis of the governor control system for Sirikit Hydropower. This approach can enhance the performance of the operator and maintenance team, particularly during emergency and ready-to-start events. Root cause analysis requires real-time data from the DCS via the Internet of Things (IoT) in the application program interface (API) data, as well as accumulated knowledge of the power plant. This knowledge is gathered from equipment manuals, electrical and mechanical drawings, test reports, corrective maintenance reports, historical events, and the expertise of the maintenance and operation team to diagnose alarms and emergency situations. The root cause analysis is then developed using the fault tree analysis (FTA) method. Finally, all data will be prepared for logic flow analysis and graphical user interface design using the Node-RED program and dashboard, presented in a troubleshooting guide format to assist in decision-making and resolving emergency problems more effectively. According to testing results, when the governor pressure tank level was too low, leading to a lockout 86-2 operation, it took about 4 hours and 21 minutes to correct the problem. With the aid of real-time root cause analysis of the governor control system, the operator crew was able to correct this problem in less than 2 hours and 24 minutes, saving approximately 100,000 THB.