Hydraulic transmission, power generating apparatus of renewable energy type, and operation method thereof

摘要

An object of the present invention is to provide a hydraulic transmission, a power generating apparatus of a renewable energy type, and an operation method thereof which are capable of preventing the pressure increase of the pressurized oil in the high pressure oil line caused by rapid increase of the energy inputted into the rotation shaft while the hydraulic motor receives high load. A hydraulic transmission comprises: a hydraulic pump of a variable displacement type configured to be driven by a mechanical energy inputted into a rotation shaft; a hydraulic motor of a variable displacement type configured to be driven by a pressurized oil from the hydraulic pump; a high pressure oil line for introducing the pressurized oil from the hydraulic pump to the hydraulic motor; and a controller for controlling a displacement of each of the hydraulic pump and the hydraulic motor, wherein, the controller is configured to:
when at least one of the displacement of the hydraulic motor or a pressure of the pressurized oil is less than a first threshold value, control the displacement of the hydraulic motor so as to adjust the pressure of the pressurized oil in the high pressure oil line to a target pressure value; and when at least one of the displacement of the hydraulic motor or the pressure of the pressurized oil is not less than the first threshold value, reduce the displacement of the hydraulic pump so as to prevent the pressure of the pressurized oil from increasing suddenly responsive to a rapid increase of the mechanical energy inputted into the rotation shaft.