摘要
In our earlier paper,power system stabilizers (PSSs) are designed for a nine-machine system,a new pole-placement tech-nique is developed for the design,and participation factors are used to decide how many stabilizers are required and where they shall be.Eachmachine being represented by a low-order linear model,there is some reservation of the results.In this paper,extensive transient simulationsare performed and each machine is represented by a high-order nonlinear model.Coherent groups are found.A weighted speed deviationindex (SDI) is defined to find out the most unstable machines in the system.PSSs are designed after the decisions of PSS number and sites.Transient simulations are carried out again for the closed-loop system.A system stability index (SSI) is used to evaluate the stability of theclosed-loop system.It is found that three PSSs are sufficient to ensure the stability of the nine-machine system.
In our earlier paper,power system stabilizers (PSSs) are designed for a nine-machine system,a new pole-placement tech- nique is developed for the design,and participation factors are used to decide how many stabilizers are required and where they shall be.Each machine being represented by a low-order linear model,there is some reservation of the results.In this paper,extensive transient simulations are performed and each machine is represented by a high-order nonlinear model.Coherent groups are found.A weighted speed deviation index (SDI) is defined to find out the most unstable machines in the system.PSSs are designed after the decisions of PSS number and sites. Transient simulations are carried out again for the closed-loop system.A system stability index (SSI) is used to evaluate the stability of the closed-loop system.It is found that three PSSs are sufficient to ensure the stability of the nine-machine system.
