Most control algorithm for Railway Static Power Conditioner (RPC) is developed based on full compensation requirement and has no relationship with power quality standards. There are actually tolerances in power quality that full compensation may not be required. However, the relationship between RPC compensation and power quality standard is complicated and less study has been done. In this paper, the relationship between RPC compensation and power quality standard is being modeled. This makes RPC compensation more flexible so as to reduce the compensation capacity and cost. Simulation verifications are done using the electromagnetic power transient software PSCAD®/EMTDC™.