High-speed rail low-frequency oscillation suppression method based on self-feedback correction device model control

Abstract

The invention discloses a high-speed rail low-frequency oscillation suppression method based on self-feedback correction device model control. The method specifically comprises the steps that: a single-phase pulse rectifier AC side current and voltage dynamic characteristic expression is constructed, and a discrete current prediction model under a dq two-phase rotating coordinate system is obtained through the decoupling of a second-order generalized integrator; network side parameter uncertainty analysis is performed on the obtained prediction model, and uncertainty analysis is performed on discretization and sampling processes; a self-feedback correction device is designed on the basis of analysis results so as to be used for errors caused by the uncertainties; a feedback item is substituted into the prediction expression, and a cost function is solved, so that a control voltage can be obtained; and the control voltage is subjected to SPWM, so that a control pulse can be obtained. With the method adopted, the defects of high model accuracy dependence and poor current decoupling effect in traditional model prediction control can be overcome; grid-side current can have a smaller distortion rate; and the electric energy quality and system stability of a vehicle network coupling system are ensured.

Description

technical field [0001] The invention belongs to the technical field of control of single-phase pulse rectifiers for multiple train units, and in particular relates to a high-speed rail low-frequency oscillation suppression method based on model control of a self-feedback correction device. Background technique [0002] Since 2008, the low-frequency oscillation phenomenon of the locomotive-traction network system has appeared successively in many places of my country's EMU or electric locomotive. The phenomenon of low-frequency oscillation in the vehicle network is manifested in the fact that when multiple locomotives of the same model are hoisted at the same time on the same power supply feeder, the catenary network voltage fluctuates greatly abnormally, the phase difference of the network voltage and network flow occurs, and the envelope of the instantaneous value of the voltage (or current) waveform presents a low frequency. Periodic fluctuations. When low-frequency oscil...

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Problems solved by technology

However, the four-quadrant converter is a typical nonlinear, multi-variable and strongly coupled system, which is sensitive to external disturbances and system parameter changes, and it is difficult to achieve a good control effect by using traditional control methods.

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