Abstract: A power generation system includes a rotating machine having a mechanical rotational output. An electrical generator is connected to the mechanical rotational output, and has an electrical output electrically connected to a power distribution system. A generator control unit is controllably coupled to at least the electrical generator. The generator control unit includes a memory and a processor. The generator control unit is configured to operate in conjunction with an overvoltage protection unit including a redundant overvoltage operational test system. The redundant overvoltage operational test system includes an operational amplifier configured to operate as a voltage follower during a first mode of operations, and as a point of regulation gain amplifier during a redundant overvoltage operational test.