Design method of fuzzy PI controller for EMU rectifier

A design method and technology for EMUs, which are applied to AC network circuits, output power conversion devices, and AC power input to DC power output, etc. problem, to achieve the effect of improving robustness, improving stability, and good adaptability

Active Publication Date: 2019-11-12
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

At present, EMUs usually adopt the traditional proportional-integral (PI) control method, but its control parameters are not easy to tune and are sensitive to system disturbances
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 the traditional linear control method cannot achieve the ideal control effect.

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  • Design method of fuzzy PI controller for EMU rectifier
  • Design method of fuzzy PI controller for EMU rectifier
  • Design method of fuzzy PI controller for EMU rectifier

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Embodiment Construction

[0047] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. In this embodiment, the CRH5 EMU is taken as an example, and the control flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0048] A. Establish the mathematical model of the pulse rectifier on the EMU network side in the dq coordinate system.

[0049] Establish the equivalent circuit of the EMU pulse rectifier, then the state equation of the rectifier is:

[0050]

[0051] In the formula, L 0 is the equivalent leakage inductance of the traction transformer traction winding; R 0 is the equivalent impedance of the traction transformer traction winding; u N and i N are the equivalent AC voltage and current of the traction grid side, respectively; i dc and i d Respectively, the pulse rectifier output current and the load current; udc is the intermediate DC side voltage; R d Simplified equivalent resi...

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Abstract

The invention discloses a design method of a fuzzy PI controller for an EMU rectifier, and the method comprises the following steps of constructing a dynamic characteristic relationship of AC side voltage and current of an EMU network side rectifier; decoupling by a two-phase generalized integrator to obtain a d-q two-phase rotating coordinate system current predictive model; considering a methodof combining fuzzy control and PI control to compensate for the shortcomings such as poor robustness of the PI control itself, controlling and correcting the input quantity through the processes suchas fuzzification, fuzzy inference and clearing in the controller; and controlling the voltage to be subjected to SPWM modulation to obtain the control pulse. The design method provided by the invention does not depend on the accurate mathematical model of the system, and has strong adaptability. The fuzzy PI control has the characteristics of small total harmonic distortion, small current distortion, small voltage overshoot on the DC side, fast dynamic response, etc. The problem of low frequency oscillation of the electric quantity of the traction network-EMU can be effectively restrained.

Description

technical field [0001] The invention relates to the technical field of rectifier control on the grid side of an EMU, in particular to a design method for a fuzzy PI controller for an EMU rectifier. Background technique [0002] In recent years, traction network voltage low-frequency oscillation accidents have occurred in multiple locomotive depots of electrified railways in my country. pressure fluctuations. Low-frequency network voltage oscillation can easily cause locomotive traction blockage, seriously affecting the normal operation of the railway. [0003] Therefore, it is of great significance to study the mechanism of low-frequency oscillation and its suppression method. Liao Yicheng et al. derived the output impedance model of the fully parallel AT traction power supply network, and obtained the input admittance model of the EMU by constructing and analyzing the state-space small-signal model of the CRH5 car, and then obtained the impedance of the vehicle-network cou...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/24H02M7/217
CPCH02J3/00H02J3/24H02M7/217
Inventor刘志刚晏启翔
OwnerSOUTHWEST JIAOTONG UNIV