The invention discloses a power-saving device and method for large-size
power equipment. The power-saving device comprises a
machine case, wherein a plurality of support frameworks are uniformly distributed in the
machine case, an integrated
control unit is arranged at one side of an upper part of each support framework, a control loop circuit box is arranged at one side of the integrated
control unit, a proportional integral differentiation (PID) closed-loop detection extraction unit is arranged at the other side of the control loop circuit box, a speed regulation box is arranged at a lower side of the control loop circuit box, a power-saving main loop box is connected with a lower side of the speed regulation box, three groups of first connection lines are connected with a lower side of the power-saving main loop box, the other ends of the first connection lines are connected with a
voltage stabilization unit, a line outlet of the
voltage stabilization unit is connected with bypass control units through the three groups of first connection lines, a surge
processing device is arranged at one side of the
voltage stabilization unit, a reactive
power compensation device is arranged at a lower side of the surge
processing device, a line outlet of the reactive
power compensation device is connected with a third connection line, and the other end of the third connection line is connected with a
harmonic compensation device. By the power-saving device,
harmonics can be eliminated, and power-saving operation is completed better.