抄録
This paper describes a self-commutated Static Var Compensator for suppressing voltage fluctuations caused by an a. c. electric railway (Shinkansen, or new trunk line). The a. c. electric railway is a single-phase load with large changes of reactive power and it causes large voltage fluctuations and power unbalances among three phases in the power system.
The authors have developed a new voltage fluctuation compensating system using a self-commutated Static Var Compensator. This system has the functions of reactive power compensation and negative-phase-sequence current absorption and can suppress rapidly-changing voltage fluctuations and reduce the three-phase power unbalance caused by the a. c. electric railway, effectively. This compensating system with a capacity of 40 MVA has been put to practical use for the first time in the world, in 1993. The test results at site show that the system has excellent performance characteristics.
Theoretical analysis on the characteristics of voltage fluctuations with or without the compensating system and the evaluation of the test results including the comparison between the theoretical values and measured ones are also reported.
