System and method for improved reactive power speed-of-response for a wind farm

A method for regulating reactive power in a power system connected to a power grid, the method comprising:

• determining, via a non-linear voltage regulator, a non-linear voltage error as a function of a linear voltage error;
• calculating a non-linear time constant as a function of at least one of the non-linear voltage error or history of the non-linear voltage regulator;
• adjusting the non-linear time constant;
• and,
• determining an output of the non-linear voltage regulator based on the non-linear voltage error, a non-linear gain parameter, and the non-linear time constant.

A voltage control system, comprising:

• a first control path comprising a first voltage regulator, the first control path configured to calculate a linear voltage error as a function of at least one of a voltage feedback or a voltage reference and generate a first output based on the linear voltage error;
• and,
• a second control path comprising a second voltage regulator, the second voltage regulator comprising a deadband configured to determine a first non-linear voltage error based on the linear voltage error, the second voltage regulator configured to generate a second output based on the non-linear voltage error,
• wherein the voltage control system is further configured to generate a reactive power command as a function of the first and second outputs.