Diesel engine frequency conversion starting method and diesel generating set and locomotive

Abstract

The invention relates to a diesel engine variable frequency starting method, and the method comprises: control of an excitation winding: according to the torque and the rotating speed of a motor, an excitation current-motor revolution counter is checked to obtain an excitation current given value If*, a main motor excitation current feedback signal If is detected, according to the If* and the If, excitation current PI control is performed, and the output of a chopper is controlled; and a control of an armature winding: an initial value of a direct-axis current given value Id* is set to zero, a machinery angular frequency [omega]e and a rotor position angle [theta] are calculated, Clark and Park transformation is performed on the [theta] and motor instantaneous current values Ia, Ib and Ic, a direct-axis current Id and a quadrature-axis current Iq are obtained, diesel engine rotating speed PI control is performed, a quadrature-axis current given value Iq* is outputted, quadrature-axis voltage PI control is performed, a quadrature-axis voltage control signal Uq is obtained, direct-axis voltage PI control is performed, a direct-axis voltage control signal Ud is obtained, Clark and Park inverse transformation is performed on the Ud, the Uq and the [theta], reference signals Ua*, Ub* and Uc* are obtained, and inverter output voltages Ua, Ub and Uc are controlled. The optimized variable frequency starting control and system configuration are realized.

Description

technical field [0001] The invention relates to a diesel engine frequency conversion starting method, a diesel generator set and a locomotive, and belongs to the technical field of internal combustion locomotives. Background technique [0002] On diesel locomotives using AC synchronous main generators, the diesel engine generator set is started by frequency conversion, which can save starter motors, gearboxes and other equipment, which not only solves the problems of large space occupation and increased axle load, but also greatly reduces Noise, abnormal sound, heat, oil leakage and other phenomena, the performance and maintainability of the locomotive are greatly improved. Therefore, the frequency conversion starting technology is getting more and more attention from manufacturers and users. [0003] The current general practice of frequency conversion starting of diesel generator sets is to use the DC power supply of the locomotive battery to control the excitation windin...

AI Technical Summary

Problems solved by technology

Although the existing technology is relatively mature in terms of drive and control, there are still problems such as complex control strategies, and its control performance is greatly affected by motor parameters.

Especially when the rated intermediate voltage of the traction inverter is high, the synchronous generator is used as a motor, and the voltage-frequency ratio of the three-phase AC output by the inverter is required to be high. However, under the condition of battery power supply, the intermediate DC voltage is relatively low. At the same time, the synchronous motor will generate a higher back electromotive force at a lower speed, which limits the output torque of the synchronous motor

Images