At F_Т = 0.1U_н, the voltage rise rate is:

The rise rate of the excitation voltage is:

КΔU— regulator gain coefficient via the voltage channel.

The selected parameters of the Voltage Unit (VU / Блок БН) ensure a total open-loop system gain coefficient of 31.58 under rated load conditions. According to the foundational expression linking control system parameters, the droop (statism) of the voltage regulation loop is defined as s_U = (1 / K) * 100% = (1 / 31.58) * 100% = 3.17%. This metric complies perfectly with the standard 1–5% range established by GOST and PTE guidelines for heavy 800 MW class turbogenerators. This specific value guarantees the critical balance required: high precision in grid node voltage maintenance combined with stable parallel operation of the machine within the power system. Upon transitioning to the no-load mode, the total open-loop gain coefficient increases due to variations in the controlled object parameters (specifically, the reduction in the equivalent circuit resistance).

8.2. Dynamic Stability

Dynamic stability is defined as the stability of the system under large disturbances, i.e., under disturbances where the system becomes non-linear. As already mentioned in Section 8.1, when the load changes up to 10%, the system can still be considered linear.