Studying the turbine-generator oscillations a case study of Lakvijaya Power Station

Abstract

The Lakvijaya Power Station located in Narakkalliya, Norochcholai, Sri Lanka plays a crucial role in the nation’s energy sector, contributing significantly by almost half of the load to the electricity grid at most of the year. However, similar to any large-scale power facility, it also faces operational challenges, including turbine-generator oscillations. This research study presents a comprehensive study focused mainly on understanding and help mitigating these oscillations for improved operational efficiency and grid stability. This research inherits a good conjunction of theoretical analysis, numerical simulations, and practical measurements to characterize the nature and causes of turbine-generator oscillations at Lakvijaya Power Station. Through detailed modelling, factors such as turbine multi-stages dynamics, generator response characteristics, speed governor controls, excitation controls, and grid interactions are investigated to identify potential sources of oscillations. Furthermore, advanced signal processing techniques are applied to real-time operational data to detect and analyze oscillatory patterns. This includes frequency domain analysis and modal analysis with modulation study to pinpoint dominant oscillation frequencies and modes. The results of this study offer valuable insights for power plant operators, grid operators, and researchers involved in the operation and optimization of large-scale power generation facilities. By detailed in-depth evaluation of turbine-generator oscillations at Lakvijaya power station, this study contribute to the broader country’s visionary policy of ensuring reliable and efficient electricity supply in Sri Lanka’s energy landscape.