Harmonic elimination method

The invention discloses a harmonic elimination method, which is applied to a harmonic elimination system, and the harmonic elimination system comprises a central processing module, a control module, a monitoring module and a harmonic elimination module. The central processing module is in communication connection with the monitoring module and the control module. The control module is in communication connection with the harmonic elimination module. The harmonic elimination method comprises the following steps: receiving a voltage signal in a power grid main loop monitored by the monitoring module, the voltage signal comprising frequency and amplitude; judging whether the operation state of the power grid main loop is normal according to the voltage condition; when the power system generates resonance, enabling the harmonic elimination system to send a control signal to the control module according to the operation state of the power system, so that the control module controls the number of capacitor banks co