| Project/Area Number |
59420026
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
電力工学
|
|---|
| Research Institution | University of Tokyo |
|---|
Principal Investigator |
SEKINE Yasuji Faculty of Engineering, University of Tokyo, 工学部, 教授 (00010702)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
OSANO Minetada Faculty of Engineering, University of Tokyo, 工学部, 助手 (80107565)
ITO Haruo Faculty of Engineering, University of Tokyo, 工学部, 助手 (50010921)
YOKOYAMA Akihiko Faculty of Engineering, University of Tokyo, 工学部, 講師 (30174866)
|
|---|
| Project Period (FY) |
1984 – 1986
|
| Project Status |
Completed (Fiscal Year 1986)
|
| Budget Amount *help |
¥21,900,000 (Direct Cost: ¥21,900,000)
Fiscal Year 1986: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1985: ¥8,000,000 (Direct Cost: ¥8,000,000)
Fiscal Year 1984: ¥8,900,000 (Direct Cost: ¥8,900,000)
|
|---|
| Keywords | Eigenvalue Control / Transient Stability / Midterm Stability / Subsynchronouse Resonance / 負制動振動 / 低周波軸ねじれ共振 / 自己励磁 |
|---|
| Research Abstract |
Midterm stability of power system is receiving increasing attention not only in Japan but also in many other countries. It is caused by the improper setting of controller ( AVR and speed governor ) parameters and the operating state of generator. It Should be noticed that it is not caused by the unbalance between input and output powers of generator as experienced in transient stability.
Eigenvalue control proposed in this paper aims at stabilizing a power system after disturbance by adjusting the controller parameters and operating state of generator. More precisely, the dominant eigenvalues of post-disturbance power systems are caluculated on the on-line basis and the controller parameters and generator operating state ( terminal voltage, active and reactive powers ) are changed so as to move them to the left half domain of s-plane.
Success of the proposed control scheme is governed by the computing time required for on-line caluculation of the dominant eigenvaluesd and by the settling time of control actions.
New method have been developed to caluculate efficiently the eigenvalue sensitivity matrix with respect to control variables taking into acount the effects of induction motor and static voltage characteristics of load. Effectiveness of the proposed methods have been confirmed by numerical examples.
Two control schemes have also been studied aiming at deciding quickly how much each control valiable shoud be changed to more the unstable dominant eigenvalue(s) to the left half plane. One is called DEM(Dominant Eigenvalue Minimization) which changes the weighted sum of dominant eigenvalue variations by the largest amount at such control step satisfying given constraints on control variables. The other is called TCM(Total Correction Minimization) scheme which minimizes the weighted sum of the absolute values of control variable variations.
Effectiveness of the two control scheme is demonstrated by numerical example.
|
