Method for accurately calculating network voltage of overhead line system of electric locomotive
A technology for electric locomotives and catenary, applied in the direction of electric digital data processing, design optimization/simulation, special data processing applications, etc., can solve problems such as enlargement, calculation error, effective value change of overhead line voltage, etc.
Pending Publication Date: 2022-03-04
CRRC DALIAN CO LTD
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Problems solved by technology
[0003] With the development of electric locomotives, the number of electric locomotives is increasing day by day, and the resulting problem is the increase of high-order harmonics in the catenary, which leads to occasional and instantaneous increase of overhead line voltage. Opening the main break will affect the operation of the locomotive and the operation of other locomotives on the crossing road. With the increase of high-order harmonics, the effective value of the overhead line voltage of the electric locomotive will also change. Through the existing calculation method for the effective value of the overhead line voltage, the harmonic When the ratio corresponding to the fundamental wave is below 60%, it is generally consistent with the effective value of the overhead line voltage. When it becomes larger than about 80%, there will be a calculation error of about 3%, and with the increase of the harmonic ratio big and getting bigger
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Embodiment 1
[0031] A method for accurately calculating the catenary voltage of an electric locomotive, comprising the following steps:
[0032] S1: Collect the network voltage sine wave data detected by the detection unit, modify the calculation method of taking the absolute value of the collected network voltage sine wave data signal, and modify the calculation method of taking the absolute value of the collected network voltage sine wave data signal , changed to the way of quadratic;
[0033] S2: Calculate the low-pass filter operation, and then convert it, change the absolute value of the collected network voltage sine wave data signal to the calculation method of integral and then take the square root, perform the low-pass filter operation, take the average value and then convert it into a frame Calculate the RMS value of the line voltage;
[0034] S3: perform data conversion on the calculated data, and transmit the converted signal data to the wireless transmission unit;
[0035] S...
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The invention discloses a method for accurately calculating the network voltage of an electric locomotive contact network, and belongs to the technical field of electric locomotive systems. The invention relates to a method for accurately calculating the network voltage of a contact network of an electric locomotive, which is characterized in that an original calculation mode of taking an absolute value of a network voltage sine wave is changed into a square mode, and a mode of carrying out low-pass filtering operation, taking an average value and then converting into a line voltage effective value is changed into an integral and then carrying out square root extraction is adopted for calculation. The problem that the overhead line voltage mistakenly exceeds the allowable maximum network voltage of the locomotive is caused, a main breaking part of the locomotive is broken to stop, the unnecessary locomotive is abnormally stopped on an application route is influenced, and a positive effect is brought to the problem of higher harmonic of the railway electric locomotive to a certain extent.
Description
technical field [0001] The technical field of electric locomotives of the present invention, more specifically, relates to a method for accurately calculating the network voltage of an electric locomotive catenary. Background technique [0002] The power supply mode of the electric locomotive is to introduce the main line 25kV standard catenary network voltage (hereinafter referred to as the overhead line voltage) into the transformer in the car through the high-voltage part of the pantograph of the locomotive, and enter the converter after going through the transformation ratio, and then supply it to various electrical equipment. . At the same time, the overhead line voltage directly enters the main converter cabinet through the primary side voltage transformer. The main converter cabinet collects the overhead line voltage and calculates the effective value of the overhead line voltage. Through the judgment of the effective value, the overhead line voltage is determined. W...
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Patent Timeline
Login to View More IPC IPC(8): G06F30/20G06F111/10G06F119/02
CPCG06F30/20G06F2111/10G06F2119/02
Inventor 周天翔李晓楠朱晓晴苗琰泽隋岩欣
Owner CRRC DALIAN CO LTD