Anti-swing control method and system for variable amplitude motion of tower crane

The invention provides an anti-swing control method and system for variable amplitude motion of a tower crane, and the method comprises the steps: obtaining output torque extreme value data in a frequency converter in real time when the tower crane runs; carrying out different value removal and extremum processing on the output torque extreme value data in sequence to detect whether the output torque extreme value exceeds the output torque extreme value corresponding to a set angle threshold value or not; if yes, the rope length and the hoisting weight of the tower crane at the moment are obtained through a tower crane height sensor and a weight sensor, the maximum operation frequency of the tower crane is calculated in combination with the output torque extreme value corresponding to the set angle threshold value, and the control system limits the operation frequency not to exceed the maximum frequency. According to the method, the problem that the swing angle of the tower crane cannot be specifically measur