https://www.researchgate.net/publication/324135034_Airborne_Wind_Energy_Conversion_Using_a_Rotating_Reel_System : an extract from the chapter 22 from AWEbook2018:
“22.3.2 Direct Mode of Energy Generation
In this mode the rotational motion of the ground rotor is converted directly into
electricity, using one or more generators that are coupled to the rotor by a gear
mechanism, as illustrated schematically in Fig. 22.1. The winch modules manage
the kinematically induced length variation of the peripheral tethers, as shown in
Fig. 22.4. They are controlled in such a way that the tension in the tethers is equal
and constant during operation. The modules are electrically interconnected such
that the generated and consumed energy is balanced, avoiding the implementation of
expensive temporary energy storage. To account for losses in the electrical machines
a small amount of electricity is provided by the main generator which is driven
directly by the rotor.
By adding suspension lines, as shown in Fig. 22.5, the force level in the system
of peripheral tethers is lowered and, as consequence, also the generated and consumed
amounts of energy. Because of the reduced losses in the electrical machines
the total amount of electrical energy required for the actuation of the tether system
is decreased. However, with the addition of suspension lines the tensile torque
transmission system becomes more complex and in particular also statically indeterminate
(hyperstatic). As consequence this poses additional challenges to the control
systems of the winch modules.”
I would add that the suspension lines reduce the axial force, so the torque transfer value.