A system for dampening first oscillations of a first frequency and second oscillations of a second frequency in electrical power on a power grid, said system being configured to counteract and dampen first oscillation and second oscillation at different low frequencies, said first frequency and said second frequency, the system comprising: a wind park including a first wind turbine and a second wind turbine, each of the first and second wind turbines including a rotor, a generator operatively coupled with the rotor for generating electrical power, and an inverter coupling the generator with the power grid to output the electrical power to the power grid; a controller configured to generate a first control signal to operate the inverter of the first wind turbine for modulating the electrical power output by the first wind turbine to dampen the first oscillations and to generate a second control signal to operate the inverter of the second wind turbine for modulating the electrical power output by the second wind turbine to dampen the second oscillations; and, wherein the first and second control signals are generated based on a small-signal stability control algorithm capable of resolving a first frequency component of the electrical power on the power grid that is used to generate the first control signal and a second frequency component of the electrical power on the power grid that is used to generate the second control signal; the first and second control signals are selected to cause the inverters to output electrical power in a manner that superimposes with the first oscillation and second oscillation of the electrical power on the power grid, and thereby cancel low frequency oscillations, by utilizing a feedback loop based on the low frequency oscillations of the power grid. a wind park including a first wind turbine and a second wind turbine, each of the first and second wind turbines including a rotor, a generator operatively coupled with the rotor for generating electrical power, and an inverter coupling the generator with the power grid to output the electrical power to the power grid; a controller configured to generate a first control signal to operate the inverter of the first wind turbine for modulating the electrical power output by the first wind turbine to dampen the first oscillations and to generate a second control signal to operate the inverter of the second wind turbine for modulating the electrical power output by the second wind turbine to dampen the second oscillations; and, wherein the first and second control signals are generated based on a small-signal stability control algorithm capable of resolving a first frequency component of the electrical power on the power grid that is used to generate the first control signal and a second frequency component of the electrical power on the power grid that is used to generate the second control signal; the first and second control signals are selected to cause the inverters to output electrical power in a manner that superimposes with the first oscillation and second oscillation of the electrical power on the power grid, and thereby cancel low frequency oscillations, by utilizing a feedback loop based on the low frequency oscillations of the power grid.