Power Control Apparatus and Method

Power control apparatus for modulating electrical power signals and methods for modulating electrical power signals are discussed. In one example, a power control apparatus comprises a magnetic core comprising a first limb and a second limb. A primary winding is arranged around the first limb, and a secondary winding is arranged around the second limb. The power control apparatus comprises a voltage source converter having an AC connection and a DC connection, and a controller. The controller is configured to receive data associated with parameters of a first signal in the primary winding, compare the parameters of the first signal to parameters of a reference signal for the secondary winding, determine a harmonisation signal which, when applied to the first limb, causes a second signal in the secondary winding to approximate the reference signal. The controller is configured to cause application of the harmonisation signal to the first limb using the voltage source converter.