Railway Static Power Conditioner (RPC) was developed for the purpose of controlling voltage fluctuation on three-phase side for AC electric Railway. An RPC is comprised of a pair of self-commutated PWM inverters. These inverters can act as a static var compensator (SVC) to compensate for the reactive power and also as an active power accommodator from one feeding bus to another. 20MVA/60kVRPCs started commercial operation in 2002 at each of two substations on the newly extended Tohoku Shinkansen for compensating voltage fluctuation on three-phase side caused by traction loads, absorbing harmonic current.

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