Harmonic suppression device and method

The invention discloses a harmonic suppression device and method. The harmonic suppression device comprises a measuring circuit connected with power grid equipment and used for acquiring a voltage signal of the power grid equipment and converting the voltage signal into an analog signal; the main control chip is connected with the measuring circuit and is used for processing the analog signal to obtain N paths of harmonic voltages and outputting an i-order harmonic control signal according to an i-order harmonic voltage in the N paths of harmonic voltages; n control circuits and N harmonic suppression circuits, i paths of control circuits in the N control circuits are connected between the power grid equipment and i harmonic suppression circuits in the N harmonic suppression circuits, and the i paths of control circuits are further connected with the main control chip; the main control chip is used for controlling the i-path control circuit to be turned on or turned off, and when the i-path control circuit is