Voltage control is independent of frequency control, DLN
operation, and active power sharing. This allows the PMS to
have 2 sets of algorithms, one set for P/f control and another
set for Q/V control. Since these control algorithms make set
point adjustments to different devices, they are implemented
independently of each other. The only validation required is to
ensure that the apparent power flowing through equipment or
in an interconnection tie does not exceed acceptable limits.
For example in Fig. 9 it is necessary for the PMS to ensure
that the active power through the 100MVA transformer does
not exceed 78MW when delivering 63Mvar.