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Composite fault estimation and fault tolerance control method for high-speed railway traction rectifier

A compound fault, fault-tolerant control technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problem of multi-variable control loop bidirectional model mismatch and fault estimation error, can not improve the system function self-healing capacity, etc.

Inactive Publication Date: 2016-11-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] In order to reduce the adverse effects of compound faults and improve the synchronous control performance of four-quadrant rectifier networks, traditional feedback control is difficult to cope with the bidirectional model mismatch and fault estimation errors between multivariable control loops and fault observers
A single fault-tolerant method based on feedback control cannot improve the self-healing ability of the system function

Method used

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  • Composite fault estimation and fault tolerance control method for high-speed railway traction rectifier
  • Composite fault estimation and fault tolerance control method for high-speed railway traction rectifier
  • Composite fault estimation and fault tolerance control method for high-speed railway traction rectifier

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Embodiment 1

[0130] The invention takes real model parameters of a certain high-speed rail traction rectifier experimental test bench as the implementation object, the sampling time of the traction rectifier is 100 microseconds, and the fault detection and fault time does not exceed 300 microseconds. Aiming at the compound fault system with variable parameters, a closed-loop fault observer design method is proposed. This fault estimation method can not only accurately decouple multiple simultaneous faults, but also meet the microsecond-level fault diagnosis requirements of traction rectifiers; for the fault system Uncertainty, a robust adaptive fault-tolerant control method is proposed. The fault-tolerant control scheme can not only ensure that the system state has a globally consistent asymptotic convergence characteristic, but also ensure that the change of the control variable does not exceed the allowable range.

Embodiment

[0132] Such as figure 1 with 5 As shown, the embodiment of the present invention provides a high-speed rail traction rectifier composite fault equivalent space model identification method:

[0133] Based on the identification value ξ(0.3111, 0.3015, 0.6889, 0.6985) of the compound fault evolution factor in the four quadrants of the rectifier, the parameter values ​​of formula (1) can be calculated as follows:

[0134] A 1 = - 7.5 - 9.445 343.4545 0 , A 2 = - 7.5 - ...

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Abstract

The invention discloses a composite fault estimation and fault tolerance control method for a high-speed railway traction rectifier, which belongs to the technical field of fault diagnosis and fault tolerance control and aims at achieving the purpose that in a condition in which uncertainty of variable parameter coupling exists in a high-dimensional rectifier fault model, the rectifier composite fault estimation and fault tolerance control method for the high-speed train can still accurately estimate the fault in a microsecond-level diagnosis time and the function self-healing capability of the system is improved. The method comprises the following steps: 1, through composite fault equivalent space transformation, a dimension-reduction composite fault evolution model is built; 2, a least square method based on a stable filter is adopted to recognize model parameters; 3, according to strategies such as decoupling analysis and feedforward compensation, a rectifier closed loop fault estimation model is built; and 4, a multivariable dynamic compensator is built for improving the robustness in a rectifier fault state. Thus, a model reference adaptive controller is designed to ensure the system to have global consistency and fast convergence properties.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis and fault-tolerant control, in particular to a composite fault estimation and fault-tolerant control method for traction rectifiers of high-speed railway trains. Background technique [0002] Different from ordinary three-phase AC drive rectifiers, high-speed railway train traction rectifiers use a single-phase alternate power supply mode. When the high-speed train runs along the power phase separation area for a long time, this cyclic driving mechanism is the root cause of multivariable composite faults of the rectifier. During the four-quadrant modal switching operation of the rectifier, although the controller, actuators and sensors are all normal, inappropriate trigger pulses can still lead to composite faults. In addition, considering the high-intensity bidirectional energy flow between catenary-side and inverter-side drive systems, the complex interleaved operating conditions of HSR...

Claims

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Application Information

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IPC IPC(8): G05B13/04
Inventor 张坤鹏姜斌陈复扬冒泽慧
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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