Methods and systems for controlling a power conversion device

A power generation system, comprising:

• a power source;
• a power conversion device comprising a device input and a device output, wherein said device input is coupled to said power source;
• a transformer comprising a transformer input and a transformer output, wherein said transformer input is coupled to said device output at a first point of interconnection and wherein said transformer output is coupled to a power grid at a second point of interconnection;
• at least one sensor positioned between said power conversion device and said transformer and configured to measure a voltage level at the first point of interconnection;
• and
• a system controller 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 generation system, and determine a gain parameter of said power conversion device based at least on the impedance of the power grid.

A method for controlling operation of a power conversion device included within a power conversion system, wherein a power source provides power to the device which provides power to a transformer at a first point of interconnection, and wherein the transformer is coupled to the power grid at a second point of interconnection, and wherein at least one sensor is coupled between the device and the transformer, said method comprising:

• varying a reactive current output of the power conversion device;
• receiving a sensor signal from the at least one sensor, wherein the sensor signal includes data associated with a voltage level at the first point of interconnection;
• determining an impedance of the power grid at the second point of interconnection based at least partially on a change in the voltage level in response to the varied reactive current;
• determining when determining the impedance of the power grid will not negatively affect operation of said power conversion device;
• determining a gain parameter of said power conversion device based at least on the impedance of the power grid;
• and
• controlling operation of said power conversion device based on at least one of the gain parameter and the impedance of the power grid.