Method for suppressing low-frequency oscillation of high-speed rail based on model predictive current control

A current control, low-frequency oscillation technology, applied in the direction of reducing/preventing power oscillation, electrical components, circuit devices, etc., can solve the problem that the control effect is difficult to improve, improve the anti-interference ability and stability performance, and eliminate circuit harmonics the effect of interference

Inactive Publication Date: 2017-09-12
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

It is difficult to improve the control effect of traditional linear control methods, so it is necessary to introduce nonlinear control methods, such as predictive control and passive control, into the control of converters

Method used

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  • Method for suppressing low-frequency oscillation of high-speed rail based on model predictive current control
  • Method for suppressing low-frequency oscillation of high-speed rail based on model predictive current control
  • Method for suppressing low-frequency oscillation of high-speed rail based on model predictive current control

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Embodiment Construction

[0069] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. In this embodiment, the CRH3 EMU is taken as an example. According to the relational expression of voltage and current on the AC side of the rectifier on the grid side of the EMU, the voltage and current on the AC side and the dq DC component of the input voltage of the rectifier are obtained through the second-order generalized integrator, and the d-q rotating coordinate system is obtained The following current prediction model; the correction item is added to improve the anti-interference ability of the algorithm; and the partial derivative of the voltage variation is obtained through the quality function, and the control voltage that minimizes the quality function is obtained. The control structure diagram is as follows figure 1 shown. In this way, the model predictive current control can be realized, and the control performance of ...

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Abstract

The invention discloses a method for suppressing low-frequency oscillation of high-speed rail based on model predictive current control, comprising the following steps: constructing an Electric Multiple Units network side rectifier AC-side voltage and current dynamic characteristic relation; getting a current prediction model under a d-q two-phase rotating coordinate system through decoupling by a second-order generalized integrator; making compensation for control calculation delay through a two-step prediction method; calculating the partial derivative with respect to voltage variation for a quality function, and getting a voltage variation value minimizing the quality function; and carrying out SPWM modulation on the control voltage to get a control pulse. The fast dynamic response characteristic and the harmonic suppression effect of control are improved. Moreover, the total harmonic distortion is low, the current distortion is low, the DC voltage overshoot is small, and the dynamic response is fast. The electrical low-frequency oscillation problem of the traction network EMU can be suppressed. When the external parameters of the system change in a small range, the train network system does not oscillate compared with the transient DC oscillation mode and the oscillation peak.

Description

technical field [0001] The invention relates to the technical field of high-speed rail low-frequency oscillation suppression, in particular to a high-speed rail low-frequency oscillation suppression method based on model predictive current control. Background technique [0002] The new "AC-DC-AC" electric locomotive has been widely used in electrified railways due to its advantages of high power factor, high power, and large traction force. The control strategy of the locomotive grid-side rectifier is an important factor affecting the stability of the locomotive-grid system. At present, there have been many research results on the control methods of three-phase system pulse rectifiers at home and abroad. There are mainly two control methods of pulse rectifier: indirect current control and direct current control. Indirect current control is represented by "phase-amplitude control", and direct current control includes: state feedback, synovial film control, feedback lineariz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02M7/12H02M1/12
CPCH02J3/24H02J2203/20H02M1/12H02M7/12
Inventor 刘志刚王亚绮耿照照胡鑫烜
Owner SOUTHWEST JIAOTONG UNIV
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