Method and device for controlling starting of power generation system

A device for controlling starting of a power generation system including an internal combustion engine as a power source, an electrical generator, and a power transmission mechanism that transmits power between the internal combustion engine and the electrical generator, the device comprising:

• a controller configured to execute a rotation speed control of driving the electrical generator by using electric power supplied from a battery, and matching a rotation speed of the electrical generator with a target rotation speed at a time of starting the power generation system, wherein the controller is configured to:
• acquire output possible electric power of the battery,
• acquire the rotation speed,
• calculate, based on the rotation speed and the output possible electric power, a first upper limit torque that is an upper limit value of a torque of the electrical generator,
• execute, on the rotation speed, a filtering process of reducing a component of a resonance frequency band of a spring-mass system including the internal combustion engine, the electrical generator, and the power transmission mechanism,
• calculate, based on a filtered rotation speed and the output possible electric power, a second upper limit torque that is an upper limit value of the torque of the electrical generator,
• execute the rotation speed control under a limitation of the first upper limit torque when a temperature of the internal combustion engine is higher than a predetermined temperature determined in advance or when the output possible electric power is equal to or larger than electric power required for driving the electrical generator, and
• execute the rotation speed control under a limitation of the second upper limit torque when the temperature of the internal combustion engine is equal to or lower than the predetermined temperature and the output possible electric power is smaller than the electric power required for driving the electrical generator.