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High-speed railway low-frequency oscillation suppression method based on state observer model predictive control

A technology of model predictive control and state observer, applied in the direction of reducing/preventing power oscillation, converting irreversible AC power input to DC power output, etc., can solve problems such as inability to guarantee control performance, and improve control performance and anti-interference ability , good robustness and dynamic performance effects

Active Publication Date: 2019-01-11
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, in the case of parameter mismatch and model inaccuracy, control performance cannot be guaranteed

Method used

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  • High-speed railway low-frequency oscillation suppression method based on state observer model predictive control
  • High-speed railway low-frequency oscillation suppression method based on state observer model predictive control
  • High-speed railway low-frequency oscillation suppression method based on state observer model predictive control

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Embodiment Construction

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. A method for suppressing low frequency oscillation of high-speed railway based on model predictive control of state observer, comprising a model predictive control part and a state observer part, and the specific steps are as follows:

[0047] Step A: Construct the predictive control equation of the traction rectifier on the grid side of the EMU in the d-q rotating coordinate system, taking into account the parameter error.

[0048] The invention designs the controller for the traction rectifier on the grid side of the EMU with the single-phase two-level topology structure. The EMU takes the single-phase power frequency power from the catenary through the pantograph, and after it is stepped down by the on-board transformer, it is used as the input voltage on the AC side of the rectifier, and the rectifier converts the input single-phase A...

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Abstract

The invention discloses a high-speed railway low-frequency oscillation suppression method based on state observer model predictive control, Considering the error between the actual circuit parametersand the rated parameters in the prediction model, the influence of the uncertain factor of the AC circuit parameters of the rectifier is taken into account in constructing the prediction model of thetraction rectifier on the network side of EMUs, and the first-order state observer is constructed on the basis of this model. Through the derivation of the transfer function and the stability analysisof the closed-loop pole distribution graph, the design of the state observer and the selection of the key gain coefficients are completed. The parameter error of the circuit can be estimated by the state observer in real time, and the estimated parameter error can be compensated to the control voltage equation through the feedback link, and the control voltage at the next time can be obtained andoutput, and finally the switching signal of the rectifier can be obtained by sinusoidal pulse width modulation. The invention can effectively improve the dynamic performance of the traction rectifieron the network side of the EMU, improve the harmonic distortion of the current, and effectively restrain the traction network. The occurrence of low frequency oscillation of electric quantity of traction network-EMU can be inhibited effectively.

Description

technical field [0001] The invention relates to the technical field of control strategies for traction rectifiers on the side of an EMU, in particular to a method for suppressing low-frequency oscillation of high-speed rails based on state observer model predictive control. Background technique [0002] Single-phase two-level rectifiers are widely used in traction drive units of EMUs. When multiple locomotives in the same section are raised and prepared at the same time, the low frequency oscillation of the voltage and current on the grid side may occur in the traction network. When the peak value of the voltage oscillation of the traction network is large, the protection logic element of the system will be triggered, causing traction blockade. This phenomenon has a great relationship with the control strategy and control parameters of the traction rectifier of the EMU. When some parameters in the traction drive unit change, the parameters of the traditional PI controller ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02M7/02
CPCH02J3/24H02M7/02
Inventor 刘志刚王亚绮
Owner SOUTHWEST JIAOTONG UNIV
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