Enhancement of Power System Operation by Renewable Ancillary Service

Abstract

To accommodate high penetration of renewable energy in the bulk power system, the ancillary service of PV systems and wind generators was proposed so that the renewable power generation can be controlled according to the variation of system frequency and voltage. For the N-1 contingency of transmission line tripping, the participation factors of renewable systems was derived to determine the generation curtailment of PV systems to solve the overloading problem of transmission lines. The power flow analysis was executed to illustrate the effectiveness of reactive power generation by renewable energy to support the voltage quality for system steady state operation. The transient stability analysis was also performed to investigate the transient response of system frequency after contingency of generator tripping by considering the ancillary service of emergency generation control of renewable energy. Based on the computer simulation, the ancillary service of renewable energy is very critical for the voltage support of power systems with large renewable integration. The fast ramping up capability of power generation of renewable systems with smart inverters can also improve the system transient stability effectively for system severe disturbance.