Optimized Designing Of SEDC And GTSDC For The Mitigation Of Subsynchronous Resonance

Firstly, we describe the current issue of subsynchronous resonance（SSR） studyin this paper. The mechanism, analysis methods and suppression measures of SSRare respectivly analyzed. It researches Shangdu power plant Subsynchronousphenomena for the object. It makes a large number of simulation and engineertingpractice in different situations. The first or second phase of Shangdu power applies“SEDC+TSR” for inhibiting subsynchronous resonance. Because the capacity ofSEDC is limited, Generator Terminal Subsynchronous Damping Controller is used forsuppressing new SSR in third phase of Shangdu. For this reason, Shangdu thirdphase puts forward the new program of “SEDC+GTSDC+TSR” to inhibiti SSR.Secondly, it illustrates differences from the mechanism of supplementaryexcitation damping control (SEDC) and generator terminal subsynchronous dampingcontrol (GTSDC).Whether the SEDC or GTSDC is put into system, GTSDC makesto approve the effectiveness through eigenvalue to analysis method and time-domainsimulation. Only if two parameters are appropriate, this method could effectivelyinhibite SSR. It is a key issue that the parameter of SEDC and GTSDC arecoordinated. In order to solve this problem, this paper makes further study. It decidesto use the genetic algorithm and simulated annealing (GASA) method to optimize theparameters of SEDC and GTSDC. It sets a reasonable capacity of GTSDC througheigenvalue analysis and time-domain simulation to verify its effectiveness.Finally, the optimization method is combined with the practical engineeringproblems. This method proves to be effective through a variety of conditions andfailures in time-domain simulation. These become a good foundation for followingstudy.