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A harmonic current detection method for the power supply arm of a traction substation

A technology for traction substations and harmonic currents, applied in the direction of measuring current/voltage, measuring devices, measuring electrical variables, etc., to achieve fast dynamic response speed, improve steady-state detection accuracy, and good detection results

Active Publication Date: 2018-05-18
江苏森泰电器有限公司
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Problems solved by technology

Therefore, the traditional FBD method has an inherent contradiction between the dynamic response speed and the steady-state detection accuracy in the current detection process.

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  • A harmonic current detection method for the power supply arm of a traction substation
  • A harmonic current detection method for the power supply arm of a traction substation
  • A harmonic current detection method for the power supply arm of a traction substation

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specific Embodiment approach

[0048] A specific embodiment of the present invention is: a harmonic current detection method for a power supply arm of a traction substation, the steps of which are as follows:

[0049] A. Signal sampling

[0050] Sampling the load current on the uplink and downlink power supply arms of the traction substation respectively obtains the discrete value i of the load current of the uplink and downlink power supply arms at the current time n α (n), i β (n); Obtain the reference voltage discrete value u of the upper and lower power supply arms at the current moment n in the same phase as the actual voltage of the upper and lower power supply arms of the traction substation through phase-locked loop processing α (n), u β (n); where the subscripts α and β are the labels of the upper and lower power supply arms respectively;

[0051] B. Calculate the equivalent conductance

[0052] According to the discrete value i of the load current of the uplink and downlink power supply arms at ...

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Abstract

A harmonic current detection method for the power supply arm of a traction substation, the steps of which are: A obtains the discrete values ​​iα(n), iβ( n) and the discrete values ​​of the reference voltage uα(n), uβ(n); B calculates the equivalent conductance Gp(n) of the power supply arm; C obtains the linear equivalent conductance G(n) of the adaptive filter; D is discrete according to the reference voltage Values ​​uα(n), uβ(n) and linear equivalent conductance G(n), calculate the fundamental active current ip1α(n), ip1β(n) on the upper and lower power supply arms; The load currents iα(n) and iβ(n) are subtracted from the fundamental active currents ip1α(n) and ip1β(n) respectively to obtain the generalized harmonic currents icα(n) and icβ(n) on the upstream and downstream power supply arms. ; F updates the adaptive filter weight coefficient w (n) according to the calculated residual signal e (n) and the revised step factor; G makes n=n+1, repeats the operation of the A-F step, The generalized harmonic current on the upper and lower power supply arms of the traction substation can be detected in real time. The method has high detection accuracy and fast dynamic response.

Description

technical field [0001] The invention relates to a harmonic current detection method for a power supply arm of a traction substation, and belongs to the technical field of harmonic current detection of a traction power supply system. Background technique [0002] In the electrified railway traction power supply system, because the electric locomotive has the characteristics of large output power, frequent changes in speed and load conditions, the power factor of the traction grid is low, the harmonic content is high, and the negative sequence current is large, which not only produces power loss, but also It has brought serious harm to the public power grid and equipment along the railway. As an effective power quality control device, the active power quality conditioner (APQC) has received widespread attention. Its working principle is: through real-time detection of the harmonic current of the traction power supply system, the control inverter generates an , Harmonic curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R15/00
Inventor 赵海全郑宗生
Owner 江苏森泰电器有限公司
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