Excitation system models suitable for use in large-scale system stability studies are presented. Important limiters and supplementary controls are also included. The model structures presented are intended to facilitate the use of field test data as a means of obtaining model parameters. The models are, however, reduced order models and do not represent all of the control loops on any particular system. The models are valid for frequency deviations of ±5% from rated frequency and oscillation frequencies up to 3 Hz. These models would not normally be adequate for use in studies of subsynchronous resonance or other shaft torsional interaction problems. Delayed protective and control features that may come into play in long term dynamic performance studies are not represented. A sample set of data for each of the models, for at least one particular application, is provided.

IEEE recommended practice for excitation system models for power system stability studies

Excitation system models suitable for use in large scale system stability studies are presented in this paper. With these models, most of the excitation systems currently in widespread use on large, system connected generators in North America can be represented.

Excitation System Models for Power System Stability Studies

Identification of excitation systems with the generator online

This paper describes design, installation, testing, and initial operating experience with line drop compensation (LDC) at John Day powerhouse. The voltage stability analysis is performed to quantify the system benefit provided by John Day LDC, transient stability studies are performed to determine target levels for LDC settings. The design, which utilizes both reactive current droop compensation and line drop compensation, is described. LDC installation and testing are presented. Operating experience is discussed, and LDC benefit for system disturbances is demonstrated.

Design, installation, and initial operating experience with line drop compensation at John Day powerhouse

This paper presents a newly developed voltage and reactive power control device, the coordinated Q -V controller (CQVC), for a multimachine steam power plant (SPP). The requirements for the new controller are defined based on identified inadequacies of manual Q-V control. The controller uses a feed-forward correction signal based on the application of the sensitivity matrix at a power plant level. It is designed and its performance initially assessed using the Matlab/Simulink environment. The performed simulations show that all the primary design objectives are met. The Q-V controller maintains the voltage at the SPP busbar with a certain droop characteristic during slow voltage changes in the power system whilst also maintaining equal per unit reactive power sharing among the SPP generators. This ensures that the power system fully benefits from all generating units during system perturbations. The performance of the designed CQVC is validated by comparing simulation results with measured responses obtained from a real CQVC installed at a SPP.

W. W. Walkley

Papers

Control of Reactive Kva with Modern Amplidyne Voltage Regulators