A system is provided for compensating a power transmission line having one or more non-conventional power generating sources connected to the power transmission line. At least one series compensation circuit is connected to a portion the power transmission line, and at least one damping circuit is c
A system is provided for compensating a power transmission line having one or more non-conventional power generating sources connected to the power transmission line. At least one series compensation circuit is connected to a portion the power transmission line, and at least one damping circuit is connected in parallel with the series compensation circuit. The damping circuit reduces subsynchronous series resonance caused by the series compensation circuit on the power transmission line, and the series compensation circuit compensates the power transmission line.
대표청구항▼
1. A system for compensating a power transmission line, comprising: one or more non-conventional power generating sources, said one or more non-conventional power generating sources connected to said power transmission line;at least one series compensation circuit connected to at least a portion of
1. A system for compensating a power transmission line, comprising: one or more non-conventional power generating sources, said one or more non-conventional power generating sources connected to said power transmission line;at least one series compensation circuit connected to at least a portion of said power transmission line;at least one damping circuit connected in parallel with said at least one series compensation circuit, the at least one damping circuit comprising at least one resistor connected in series with a parallel connected capacitor and inductor, the at least one damping circuit tuned to decrease subsynchronous resonance, the at least one resistor tuned to damp subsynchronous resonance, and the capacitor and inductor are tuned to block current in the at least one resistor at a synchronous frequency;wherein, said at least one damping circuit is tuned for a broadband response to subsynchronous series resonance and reduces subsynchronous series resonance caused by said at least one series compensation circuit on said power transmission line, and wherein said at least one series compensation circuit compensates said power transmission line. 2. The system of claim 1, further comprising: at least one conventional power generating source connected to said power transmission line. 3. The system of claim 2, wherein said at least one conventional power generating source is of the synchronous machine type. 4. The system of claim 1, wherein said one or more non-conventional power generating sources are selected from one or more of the group comprising: a wind turbine, a wind farm, a solar power generating station. 5. The system of claim 1, wherein said at least one compensation circuit comprises at least one series capacitor. 6. The system of claim 1, further comprising: at least one switch, said at least one switch connected between said at least one series compensation circuit and said at least one damping circuit;wherein, operation of said at least one switch connects or isolates one of said at least one damping circuit to or from said at least one series compensation circuit. 7. The system of claim 6, further comprising: two or more damping circuits connected in parallel with said at least one compensation circuit;means for electrically isolating said two or more damping circuits from each other, and for selectively connecting one of said damping circuits to said at least one compensation circuit. 8. The system of claim 7, wherein one of said damping circuits is a primary damping circuit and another of said damping circuits is a backup damping circuit, the primary damping circuit and the backup damping circuit configured to be used in a complimentary manner so that when the primary damping circuit is connected the backup damping circuit is disconnected and when the backup damping circuit is connected the primary damping circuit is disconnected. 9. The system of claim 1, said power transmission line comprising one or more phases, said at least one compensation circuit connected to each of said one or more phases, wherein, said at least one damping circuit is connected to only one phase of said power transmission line. 10. The system of claim 1, said power transmission line comprising one or more phases, said at least one compensation circuit connected to each of said one or more phases, wherein, said at least one damping circuit is connected to two phases of said power transmission line. 11. The system of claim 1, said power transmission line comprising one or more phases, said at least one compensation circuit connected to each of said one or more phases, wherein, said at least one damping circuit is connected to three phases of said power transmission line. 12. A system for compensating a power transmission line, comprising: one or more non-conventional power generating sources, said one or more non-conventional power generating sources connected to said power transmission line;at least one series compensation circuit connected to at least a portion of said power transmission line;at least one damping circuit connected in parallel with said at least one series compensation circuit, the at least one damping circuit comprising at least one resistor connected in series with a parallel connected capacitor and inductor, the at least one damping circuit tuned to decrease subsynchronous resonance, the at least one resistor tuned to damp subsynchronous resonance, and the capacitor and inductor are tuned to block current in the at least one resistor at a synchronous frequency;at least one switch, said at least one switch connected between said at least one series compensation circuit and said at least one damping circuit, operation of said at least one switch can connect or isolate said at least one damping circuit from said at least one series compensation circuit; andwherein, said at least one damping circuit is tuned for a broadband response to subsynchronous series resonance and reduces subsynchronous series resonance caused by said at least one series compensation circuit on said power transmission line, and wherein said at least one series compensation circuit compensates said power transmission line. 13. The system of claim 12, further comprising: at least one conventional power generating source connected to said power transmission line; andwherein said at least one conventional power generating source is of the synchronous machine type. 14. The system of claim 12, wherein said one or more non-conventional power generating sources are selected from one or more of the group comprising: a wind turbine, a wind farm, a solar power generating station. 15. The system of claim 12, wherein said at least one compensation circuit comprises at least one series capacitor. 16. The system of claim 12, further comprising: two or more damping circuits connected in parallel with said at least one compensation circuit;means for electrically isolating said two or more damping circuits from each other, and for selectively connecting only one of said damping circuits to said at least one compensation circuit. 17. The system of claim 16, wherein one of said damping circuits is a primary damping circuit and another of said damping circuits is a backup damping circuit. 18. The system of claim 12, said power transmission line comprising one or more phases, said at least one compensation circuit connected to each of said one or more phases, wherein, said at least one damping circuit is connected to only one phase of said power transmission line. 19. The system of claim 12, said power transmission line comprising one or more phases, said at least one compensation circuit connected to each of said one or more phases, wherein, said at least one damping circuit is connected to two phases of said power transmission line. 20. The system of claim 12, said power transmission line comprising one or more phases, said at least one compensation circuit connected to each of said one or more phases, wherein, said at least one damping circuit is connected to three phases of said power transmission line.
Edris Abdel-Aty O. M. (Vsters SEX), Method and arrangement for protecting turbine generators against subsynchronous resonances occurring in power transmissi.
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