Frequency difference verification method of synchronizing device

The invention provides a frequency difference verification method of a synchronizing device, which comprises the following steps of: 1, enabling the voltages of a system side and a side to be merged to be equal in magnitude and initial phase, enabling the voltage frequency of the system side to be fixed, and adjusting the voltage frequency of the side to be merged to enable the voltages of the system side and the side to be merged to have a fixed frequency difference; and 2, by starting from the completion moment of the step 1, when the synchronous check triggering time is reached, triggering a synchronizing device to carry out synchronous check and closing control, and carrying out frequency difference verification on the synchronizing device according to the frequency difference in the step 1, the frequency difference constant value of the synchronizing device and the closing condition. According to the invention, the frequency difference verification of the synchronizing device can be simply and effectivel