Locomotive four-quadrant converter load abrupt change composite detection and control method

Abstract

The invention relates to a locomotive four-quadrant converter load abrupt change control method, in particular to a locomotive four-quadrant converter load abrupt change composite detection and control method. The locomotive four-quadrant converter load sudden change composite detection and control method is achieved through a four-quadrant control method, a voltage outer loop is changed into a sliding mode controller from a traditional PI controller and matched with a chopper controller; on one hand, an existing main circuit is not changed, and extra hardware circuit design is not needed; andon the other hand, the intermediate voltage jump quantity can be quickly controlled when sudden load change is detected, so that the stability of the intermediate voltage is ensured, and the robustness and the anti-interference capability of the control system are improved. When the abrupt load change occurs, the chopper control is matched with four-quadrant control, so that the stability of theintermediate voltage can be ensured, the fault of the traction converter cannot be caused, and the safe and stable operation of a train is ensured.

Description

technical field [0001] The invention relates to a load sudden change control method for a four-quadrant converter of a locomotive, in particular to a compound detection and control method for a sudden change in load of a four-quadrant converter for a locomotive. Background technique [0002] The four-quadrant converter is a converter with bidirectional energy flow. When the vehicle is in traction, the energy can exhibit AC / DC conversion characteristics, and rectify the AC power on the single-phase grid into a stable DC power for back-end inverter. device use. When the vehicle is under braking, the energy can exhibit DC / AC conversion characteristics, inverting the back-end direct current into alternating current with high power factor. During the operation of the train, when the inverter reports a fault or the traction motor fails, the train control system will immediately isolate the faulty motor, and the load motor will be put back into operation after the fault is elimina...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems and defects existing in the existing locomotive four-quadrant converter load mutation detection and control method, the present invention provides a locomotive four-quadrant converter load sudden change composite detection and control method. The method is realized by the four-quadrant control method, and the voltage The outer loop is changed from a traditional PI controller to a sliding mode controller and combined with a chopper controller. On the one hand, the existing main circuit does not need to be changed and no additional hardware circuit design is required. On the other hand, the intermediate voltage can be adjusted when a sudden load change is detected. The jump variable is used for rapid control to ensure the stability of the intermediate voltage and improve the robustness and anti-interference ability of the control system

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