The invention relates to high-
voltage synchronous variable-frequency soft starting equipment and a starting method thereof. The high-
voltage synchronous variable-frequency soft starting equipment comprises a
harmonic filter, a step-down
transformer, a step-up
transformer, a
rectifier bridge, an
inverter bridge, a control panel, a
synchronous motor and a gas
turbine, one end of the
harmonic filter is connected with a high-
voltage power grid in parallel, the other end of the
harmonic filter is connected with the high-voltage side of the step-down
transformer, the low-voltage side of the step-down transformer is electrically connected with the input end of the
rectifier bridge, the output end of the
rectifier bridge is electrically connected with the input end of the
inverter bridge, and the output end of the
inverter bridge is electrically connected with the low-voltage side of the step-up transformer. The high-voltage side of the boosting transformer is connected in parallel with a high-voltage grid The control panel is electrically connected with the step-down transformer, the rectifier bridge and the inverter bridge respectively; the
synchronous motor and the gas
turbine are coaxially installed, and the
synchronous motor drives the gas
turbine to start. A position sensing-free detection method is adopted, the actual position of the rotor is indirectly detected by the back
electromotive force of the armature winding of the synchronous motor, and the aim of tracking the rotating speed of the rotor through the synchronous rotating speed of the motor is achieved.