Dynamic Modeling and Analysis of Bhutan’s Power Systems With PSSE Software

In the absence of a dynamic base case model for the Bhutan power system, this study undertakes dynamic modeling and subsequent analysis. The dynamic analysis is crucial for predicting and comprehending power system behaviors under varying conditions. To achieve this, dynamic models of generators, exciters, and governors of three major power plants in Bhutan are developed using Siemens’ Power System Simulator for Engineering (PSSE) software. The three-phase solid fault was simulated at specific locations, aligned with maximum power flow in the transmission line calculated from the steady-state simulation, to observe dynamic responses of the generators. The study provides valuable insights to system operators, planners, and maintenance engineers regarding generator behaviors during abnormal conditions such as faults. The analysis of response parameters, including generator’s real power output and terminal voltage was carried out under both Power System Stabilizer (PSS) enabled and disabled conditions. The study reveals the effectiveness of employing PSS in enhancing the dynamic stability of the generators. Additionally, the dynamic result from the model and the Phasor Measurement Unit (PMU) during the grid incident is found to be same, indicating the correctness of the generator model.