Automatic correction method for electrical angle offset

• Main Authors: LI LUYI, ZOU LIMING, XU XI, WANG PO, CAO CHONGZHI, WANG CHAO, MOU XIAOGANG, JIN HONGFEI, DONG HAIXING
• Format: Patent
• Language: Chinese; English
• Published: 19.06.2020
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention discloses an automatic correction method for electrical angle offset. The method specifically comprises: setting an electrical angle e_Theta to be 0; carrying out CLARKE conversion and PARK conversion on the collected three-phase currents Ia, Ib and Ic of the motor to obtain a d-axis feedback current Id_fb and a q-axis feedback current Iq_fb; enabling the target current Id_ref of thed axis and the feedback current Id_fb to pass through a proportional integral PI regulator of the d axis current, enabling the q-axis target current Iq_ref and the feedback current Iq_fb to pass through a proportional integral PI regulator of the q-axis current, respectively obtaining d-axis voltage Ud and q-axis voltage Uq, and after PARK inverse transformation and CLARKE inverse transformationare conducted on the d-axis voltage Ud and the q-axis voltage Uq, obtaining three-phase voltages Ua, Ub and Uc and then applying the three-phase voltages Ua, Ub and Uc to the motor; and when the motorstops running, taking the