Power system for a working machine and corresponding operation method

A method for operating a power system for a working machine, wherein the power system comprises:

• a prime mover and a main shaft, wherein the prime mover is drivingly connectable to the main shaft;
• a planetary gear set comprising a rotatable first member drivingly connected to the main shaft, a rotatable second member and a rotatable third member for propulsion of the working machine;
• a hydraulic system comprising at least one hydraulic actuator for performing a working function of the working machine during use of the working machine;
• an electric energy storage system;
• a first hydraulic machine mechanically coupled to the main shaft and hydraulically coupled to the hydraulic system;
• a first electric machine mechanically coupled to the main shaft;
• a second electric machine mechanically coupled to the rotatable second member, wherein the first and second electric machines are electrically
• connected, and wherein the electric energy storage system is electrically connected to the first and second electric machines, and wherein the power system further comprises a second hydraulic machine mechanically coupled to the rotatable second member and hydraulically coupled to the hydraulic system, wherein the second hydraulic machine is configured such that it can be operated in two opposite rotational directions in order to generate hydraulic power to the hydraulic system;
• wherein the method comprises operating the second hydraulic machine as a pump or as a motor.