Power sensor’s gain Kp is the ratio of power –command to output power for zero SSE condition. In the SPCS.SSE can take place only in voltage control loop. All transducer in the system must be considered as error free. For zero SSE condition, voltage reference signal V*op is equal to the product of output voltage Vop and voltage sensor’s gain Kv as in (19)
If the open-loop gain of the voltage control loop approaches infinity, large-signal closed-loop gain Kvloop is independent of operating point and approaches the reciprocal of voltage sensor’s gain 1/Kv. The product Kv•Kvloop will approach unity. SSE is reduced to zero.