Power control unit, power generation system, and method for controlling electric power of power generation system comprising hydropower plant or wind turbine plant

Abstract

A power control unit (20) for controlling electric power of a power generator system (100) comprising a hydropower plant (30A) or a wind turbine plant (30B). The system (100) comprises a turbine controller (32), a turbine (34), an electric generator (36), and an electrical energy storage unit (40) which is arranged in parallel with the electric generator (36) with respect to an output of the system (100). The power control unit (20) arranged to be connected to the turbine controller (32) and the electrical energy storage unit (40). The power control unit (20) being configured to determine (310) an electric output power reference of the system (100) based on a frequency (401) at the output (90), and to control (320) an electric output power (402) of the system (100) based on the output electric power reference by a mutual control of the turbine controller (32) and the electrical energy storage unit (40).