Patent ID: 8787052

Claim:
A power conversion system configured to provide alternating current (AC) power to a transformer, wherein the transformer comprises a transformer input coupled to said power conversion system and a transformer output coupled to a power grid, said power conversion system comprising: a power conversion device comprising a device input and a device output, said power conversion device configured to receive power from a power source at said device input, said device output configured for coupling to the transformer input; at least one sensor coupled at a first point of interconnection between said device output and the transformer input and configured to measure a voltage level at the first point of interconnection; and a system controller communicatively coupled to said power conversion device and said at least one sensor and configured to vary a reactive power of said power conversion device, determine an impedance of the power grid based at least partially on a change in the voltage level at the first point of interconnection caused by the varied reactive power, determine when determining the impedance of the power grid will not negatively affect operation of said power conversion system, and determine a gain parameter of said power conversion device based at least on the impedance of the power grid.