| 摘要 |
<p>A method for measuring the instantaneous rotation speed of a synchronous generator, comprises the following steps: a. initializing a program and zeroizing Ua1, Ub1, Uc1 and Ua2 (201); b. synchronously detecting three-phase instantaneous voltage values Ua0, Ub0, and Uc0 (202); c. calculating an integral value Uas of Ua1 (203); d. calculating a difference value Ubc between Ub1 and Uc1 (204); e. judging whether Ua1 is greater than or equal to Ua2 and Ua1 is greater than or equal to Ua0 (205), if so, zeroizing Uas (206) and then judging whether Uas or Ubc is equal to 0 or not (207), if not, directly judging whether Uas or Ubc is equal to 0 or not (207); f. if Uas or Ubc is equal to 0, assigning the value of Ua1 to Ua2 (211), and then respectively assigning values of Ua0, Ub0 and Uc0 to Ua1, Ub1 and Uc1 (212); when Uas and Ubc are not equal to 0, calculating a ratio of Ubc to Uas (208), then calculating the motor rotation speed by n=60/2P (209), displaying the rotation speed on a display or transmitting the rotation speed to the outside via a communication interface (210), then assigning the value of Ua1 to Ua2 (211), and respectively assigning the values of Ua0, Ub0 and Uc0 to Ua1, Ub1 and Uc1 (212); and g. repeating the steps from the step b to the step f.</p> |
