Stationarity control method for electric locomotive under working condition of constant speed operation

Abstract

The invention discloses a stationarity control method for an electric locomotive under a working condition of constant speed operation. The stationarity control method comprises the following steps that A, a microcomputer completes basic computation of output traction force or output braking force; B, the microcomputer can adjust the locomotive to enter into a traction-electric braking switch limiting mode to output predetermined traction force or output predetermined braking force according to a computation result; and C, the microcomputer completes self-adaptation adjustment of control parameters by controlling various coefficients in the basic computation. The stationarity control method for the electric locomotive under the working condition of constant speed operation has the beneficial effects that firstly, through combined action of a proportional element and an integration element and the self-adaptation adjustment of the control parameters, the adjustment speed and accuracy are improved, and the influences of errors in the elements such as testing on the constant speed accuracy are eliminated; and secondly, the inversion frequency of the traction / braking working condition is limited, occurrence of impulsion is decreased, and the requirements for stationary application on routes where the ramp change is frequent and complex can be met.

Description

technical field [0001] The invention relates to a method for controlling the stability of an electric locomotive, in particular to a method for controlling the stability of the electric locomotive under constant-speed operating conditions. Background technique [0002] The constant speed running condition is a common function of AC drive electric locomotives at present, and refers to a working condition in which the locomotive automatically implements traction force or electric braking force to maintain constant speed operation. [0003] Constant speed operation can reduce the operating frequency of the driver, reduce the work intensity, and is especially suitable for passenger trains running on long-distance roads. [0004] The constant speed operation condition not only requires the locomotive to be able to operate within the range specified by the target speed, but also to ensure that the impulse during operation is as low as possible, especially for passenger trains, whi...

AI Technical Summary

Problems solved by technology

[0007] The existing locomotive constant speed control method shows in practical applications that the locomotive speed fluctuates in a large range, cannot meet the constant speed accuracy requirements, the traction brake transition is sudden, the train runs with a large impulse, and is not suitable for section operation with large line fluctuations. The main reason lies in the following aspects:

[0008] 1. Parameters such as speed and traction are greatly affected by hardware sampling accuracy

[0009] 2. The control strategy only adopts the proportional link, and the simple coefficient cannot meet the influence of line and load changes on the target speed control accuracy

[0010] 3. There is no transitional link between traction force and braking force conversion, resulting in a large change in the output torque when the traction electric braking working condition is switched, resulting in a large train impulse

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