Faculty Publications
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Item Design of Wide Area Controllers for Synchronous Generators(Institute of Electrical and Electronics Engineers Inc., 2024) Navaneeth, K.; Kotian, S.M.Inter-area oscillations (IAO) affect power system stability and power transfer capability. In order to damp out these oscillations, damping controllers such as power system stabilizers and other such controllers are used. However, conventional controllers rely on local signals of the device on which they are mounted in order to provide control action. These local signal based controllers may not be effective in damping out such oscillations. Therefore, wide area controllers were proposed. This has been made possible due to the research and development that has taken place in the area of wide area measurement systems (WAMS).These controllers, which utilise remote signals, have the necessary observability of the inter-area modes in order to dampen out those modes effectively. The use of remote signals, however, introduces non-negligible time delays. This may lead to getting undesirable and even counter-productive effects from the controller. Therefore, during the design of wide area controllers, care must be taken in order to properly compensate for time delays. In this paper, the design process of a wide area controller for synchronous generator is presented. The wide area controller designed is used in a two area, four machine power system and it's effectiveness in damping out IAO is demonstrated. The effect of time delays on the controller performance is explored. Additional compensation for time delay effects are discussed. Eigenvalue analysis is carried out and time-domain simulations are used to validate the eigen-inferences. © 2024 IEEE.Item A Novel Method for Calculating Steady-State Operating Conditions for DFIG-Based Wind Turbines(Institute of Electrical and Electronics Engineers Inc., 2024) Lazar, A.; Navaneeth, K.; Kotian, S.M.This paper utilizes a modified Newton-Raphson (MNR) iterative technique for steady-state initialization of doubly fed induction generator (DFIG)-based wind turbine (WT) connected to the grid. The MNR technique discussed in this paper is based on the Adomian decomposition method. The steady-state values obtained using the MNR method are compared with those obtained using the conventional Newton-Raphson (NR) method to check the accuracy of the MNR method. Further, the number of iterations taken for both methods to converge was compared. From the case studies, it is noted that the MNR method results in steady-state values, which are identical to those obtained using the NR method with lesser number of iterations. The steady-state values calculated using the MNR method are utilized to carry out the eigenvalue analysis and time-domain simulations of a DFIG-based WT power system. © 2024 IEEE.Item Application of Wide-Area Power System Stabilizer for Damping of Inter-area Oscillations(Springer Science and Business Media Deutschland GmbH, 2025) Navaneeth, K.; Kotian, S.M.Inter-area oscillations (IAO) are a main concern for the stability of power systems. Conventional controllers used for IAO damping depend on local signals. Damping provided by such controllers is sometimes insufficient, as the controller does not have enough information of the inter-area modes from local signals. With extensive research and development in the field of wide-area measurement system (WAMS), signals from remote points of the system can be obtained and utilized along with local signals, thereby providing better damping for the inter-area modes. This brings with it its own set of challenges, from choosing the appropriate remote signal to be utilized to time delays due to measurement and transmission delays of the communication network. In this paper, a summary of the various works that have been carried out by researchers, pertaining to development of wide-area control (WAC) for various power system devices, mainly wide-area power system stabilizer (PSS) for synchronous generators is discussed. The wide-area PSS is used in a two-area, four-machine power system, and it’s effectiveness in damping out IAO is demonstrated. Eigenvalue analysis is carried out. Time-domain simulations are used to validate the eigen-inferences. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.