Voltage compensation method of constant voltage-frequency-ratio control of industrial and mining electric locomotive
A technology of constant voltage frequency ratio and voltage compensation, which is applied in the direction of low-speed motor control, etc., can solve the problem of small output torque and achieve the effect of improving output torque
Inactive Publication Date: 2013-05-01
SOUTH CHINA UNIV OF TECH
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[0004] The purpose of the present invention is to propose a voltage compensation method for constant voltage-frequency ratio control of industrial and mining electric locomotives for the constant voltage-frequency ratio control system of industrial and mining electric locomotives, so as to solve the problem of small output torque when the constant voltage-frequency ratio control of industrial and mining electric locomotives is low. , and enable the electric locomotive to cope with heavy loads, network voltage fluctuations and other working conditions
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[0016] The implementation of the present invention will be further described below in conjunction with the accompanying drawings.
[0017] figure 1 is a schematic diagram of stator resistance voltage drop compensation, this embodiment is based on figure 1 The voltage and frequency relationship curve shown divides the variation range of the output frequency into 4 intervals, and the cut-off points are 2, 10, and 25. The variation range of the output voltage is also divided into 4 intervals, and the cut-off points are respectively rated output voltage 16%, 35%, 60%, the variation range of the output frequency and output voltage is from 0 to the rated value, the output frequency and the output voltage have a one-to-one correspondence between the four intervals, and the output voltage varies with the frequency within the corresponding frequency interval Uniform change. It can be seen from the schematic diagram that in each interval of the output frequency, the ratio of voltage t...
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The invention relates to a voltage compensation method of constant voltage-frequency-ratio control of an industrial and mining electric locomotive, and the method comprises the following steps such as voltage-drop compensation of stator resistance, heavy-load compensation and network voltage fluctuation compensation, wherein when the industrial and mining electric locomotive is under a starting and low-speed running state, the ratio of the stator resistance voltage drop in the stator voltage is large, and the output torque is reduced; when the locomotive works at a heavy load state, the stator voltage needs to be appropriately improved so as to meet the running requirement; and the voltage of a direct-current wire which is used for powering the electric locomotive is fluctuated, and the normal work of the electric locomotive is influenced, so that the voltage of the line needs to be properly compensated. The constant voltage-frequency-ratio control voltage of the electric locomotive is compensated through three aspects to enable the electric locomotive to output sufficiently large torque in different environments and under different states and to meet the working requirement of the electric locomotive.
Description
technical field [0001] The invention relates to the field of AC frequency conversion speed regulation, in particular to a voltage compensation method for constant voltage-frequency ratio control of industrial and mining electric locomotives. Background technique [0002] The structure of the DC motor is complicated, there are sparks in the commutator, the volume is large, the price is high, the high speed is limited, the maintenance is difficult, and the efficiency of the DC drive is low. Therefore, the AC drive system powered by the induction motor is gradually replacing the traditional DC drive and has become an industrial and mining occasions and the main development trends of power traction in the field of rail transit. [0003] At present, the control methods of AC drives that have been studied more are mainly vector control and direct torque control, but both of them have difficult problems in engineering implementation. For example, the vector control system involves ...
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IPC IPC(8): H02P23/03
Inventor 杜贵平徐伟
Owner SOUTH CHINA UNIV OF TECH