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Low-frequency Oscillation Suppression Method for High-Speed ​​Railway 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: 2021-08-03
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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  • Low-frequency Oscillation Suppression Method for High-Speed ​​Railway Based on State Observer Model Predictive Control
  • Low-frequency Oscillation Suppression Method for High-Speed ​​Railway Based on State Observer Model Predictive Control
  • Low-frequency Oscillation Suppression Method for High-Speed ​​Railway Based on State Observer Model Predictive Control

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Embodiment Construction

[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. A high-speed rail low-frequency oscillation suppression method based on model predictive control of a state observer, including 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 EMU network side under the d-q rotating coordinate system, taking into account the parameter error.

[0048] The present invention designs a controller for a traction rectifier on the side of a motor train network with a single-phase two-level topological structure. The EMU takes single-phase power frequency power from the catenary through the pantograph, and after being 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...

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Abstract

The invention discloses a high-speed rail low-frequency oscillation suppression method based on state observer model prediction control. Considering the error between the actual parameters of the circuit and the rated parameters in the prediction model, when constructing the prediction model of the traction rectifier on the EMU side and the AC side of the rectifier Based on the influence of circuit parameter uncertainty factors, a first-order state observer was constructed; through the derivation of the transfer function and the stability analysis of the closed-loop pole distribution graph, the design of the state observer and the selection of key gain coefficients were completed; through The state observer can estimate the circuit parameter error in real time, and compensate the estimated parameter error into the control voltage equation through the feedback link, obtain the control voltage at the next moment and output it, and finally obtain the rectifier switch signal through sinusoidal pulse width modulation. The invention can effectively improve the dynamic performance of the traction rectifier on the EMU network side, improve the current harmonic distortion, and effectively suppress the occurrence of low-frequency oscillation of the electrical quantity of the EMU-EMU.

Description

technical field [0001] The invention relates to the technical field of traction rectifier control strategies on the side of a motor train network, in particular to a high-speed rail low-frequency oscillation suppression method 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 hoisted at the same time, low-frequency oscillations of voltage and current on the grid side may occur in the traction network. When the voltage oscillation peak of the traction network is large, the protection logic element of the system will be triggered, causing traction blockade. This phenomenon has a lot to do with the control strategy and control parameters of the EMU traction rectifier. When some parameters in the traction drive unit change, the parameters of the traditional PI controller cannot adapt to this change through automatic ...

Claims

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Application Information

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Patent Type & Authority Patents(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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