Traction substation power supply arm harmonic current detection method

A technology for traction substations and harmonic currents, applied in the direction of measuring current/voltage, measuring devices, measuring electrical variables, etc., to overcome dynamic response speed and steady-state detection accuracy, high steady-state detection accuracy, and improve steady-state detection. The effect of precision

Active Publication Date: 2015-11-04
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.

Method used

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  • Traction substation power supply arm harmonic current detection method
  • Traction substation power supply arm harmonic current detection method
  • Traction substation power supply arm harmonic current detection method

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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

Provided is a traction substation power supply arm harmonic current detection method. The method comprises the following steps: A) carrying out sampling processing and phase-locked loop processing to obtain load current discrete values i[alpha](n) and i[beta](n) as well as reference voltage discrete values u[alpha](n) and u[beta](n) of uplink and downlink power supply arms at the current moment respectively; B) calculating equivalent conductance Gp(n) of the power supply arms; C) obtaining linear equivalent conductance G(n) of a self-adaptive filter; D) calculating fundamental wave active currents ip1[alpha](n) and ip1[beta](n) of the uplink and downlink power supply arms according to the reference voltage discrete values u[alpha](n) and u[beta](n) and the linear equivalent conductance G(n); E) subtracting the fundamental wave active currents ip1[alpha](n) and ip1[beta](n) from the load current discrete values i[alpha](n) and i[beta](n) of the uplink and downlink power supply arms respectively to obtain generalized harmonics currents ic[alpha](n) and ic[beta](n) of the uplink and downlink power supply arms; F) updating weight coefficient w(n) of the self-adaptive filter according to the calculated residual signal e(n) and the corrected step length factor mu(n)<->; and G) letting n=n+1 and repeating the operation of the steps A)-F), and thus generalized harmonic currents of the uplink and downlink power supply arms of a traction substation can be detected in real time. The method is high in detection precision and quick in dynamic response speed.

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 Applications(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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