Analytical Response of Synchronous Generators during Load Rejection and Field Short-circuit Tests

Determination of Synchronous Generator Parameters from Time-variant Analytical Load-rejection Curve Fitting

“…The electrical and mechanical equations for the SG of Figure 1, well established in [8], are defined by Eqs. ;…”

“…A given axis load-rejection test can be performed as the superposition of d -and q-axes load-rejection subtests [8]. The phase A voltage is computed by v a .t/ D v d cos.!…”

“…to organize the recently developed hybrid state model into decoupled d -and q-axes state subsystems [9], to present the time-variant analytical responses during the load-rejection tests in terms of the machine parameters using the MATLAB symbolic toolbox [8], to provide a suitable prediction-error curve-fitting (identification) procedure based on the asymptotic weighted least squares estimator (AWLSE) and a Newton-type finite-difference constrained optimization algorithm, to prove the effectiveness and suitability of the proposed approach in the determination of the SG equivalent-circuit parameter, and to assess the robustness and reliability of the proposed estimation method with a cross-validation of the generator model using on-line symmetrical sudden three-phase short-circuit test data.…”

“…In [8], a suitable approach was developed for time-variant analytical waveform-based analysis and prediction of SGs under load-rejection and open stator field short-circuit tests. In [9], a so-called hybrid state space model of the synchronous machine, presented in the matrix form, was proposed as a model predictor for the load-rejection test in the time-domain parameter identification of the generator.…”