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Traction power supply system resonance suppression method and device based on adaptive notch filter

A technology of adaptive wave trap and traction power supply system, which is applied in the direction of reducing/preventing power oscillation to achieve the effect of suppressing system resonance

Pending Publication Date: 2017-04-26
HUNAN RAILWAY PROFESSIONAL TECH COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problems existing in harmonic suppression in the existing traction power supply system, and propose a traction power supply system resonance suppression method and device based on an adaptive notch filter. The traction power supply system resonance suppression method and device can Effectively suppress low-order resonance and improve the operation stability of the traction power supply system

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  • Traction power supply system resonance suppression method and device based on adaptive notch filter

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Embodiment 1

[0057] The accompanying drawing shows an embodiment of the present invention, and it can be seen from the accompanying drawings that the present invention relates to a traction power supply system resonance suppression device based on an adaptive notch filter, including a locomotive grid-side rectifier, which consists of a The equivalent circuit control is characterized in that an adaptive notch filter is added to the equivalent circuit control of the locomotive network side rectifier, and the occurrence of system resonance is suppressed by the adaptive notch filter.

[0058] The adaptive notch filter is a second-order all-pass filter, and the transfer function of the second-order all-pass filter is shown in formula (1):

[0059] Transfer function A(z)=(α-β(1+α) z -1 + z -2 ) / (1-β(1+α) z -1 +αz -2 ) (1)

[0060] in:

[0061] β is the frequency factor, which is determined by the notch frequency of the notch filter.

[0062] α is the bandwidth factor, determined by the not...

Embodiment 2

[0076] The basic control principle of Embodiment 2 is the same as that of Embodiment 1, but the structure is different. It is a traction power supply system resonance suppression device based on an adaptive notch filter, including a locomotive grid-side rectifier, which consists of a locomotive grid-side rectifier It is characterized in that an adaptive notch filter is added to the equivalent circuit control of the locomotive grid side rectifier, and the occurrence of system resonance is suppressed by the adaptive notch filter.

[0077] The adaptive notch filter is a first-order all-pass filter, and the transfer function of the first-order all-pass filter is shown in formula (1):

[0078] Transfer function A(z)=(α-β(1+α) z -1 + z -2 ) / (1-β(1+α) z -1 +αz -2 ) (1)

[0079] in:

[0080] β is the frequency factor, which is determined by the notch frequency of the notch filter.

[0081] α is the bandwidth factor, determined by the notch filter bandwidth.

[0082] z is a discre...

Embodiment 3

[0093] The basic control principle of Embodiment 2 is the same as that of Embodiment 1, but the structure is different. It is a traction power supply system resonance suppression device based on an adaptive notch filter, including a locomotive grid-side rectifier, which consists of a locomotive grid-side rectifier It is characterized in that an adaptive notch filter is added to the equivalent circuit control of the locomotive grid side rectifier, and the occurrence of system resonance is suppressed by the adaptive notch filter.

[0094] The adaptive notch filter is a third-order all-pass filter, and the transfer function of the third-order all-pass filter is shown in formula (1):

[0095] Transfer function A(z)=( α-β(1+α) z-1+ z-2) / (1-β(1+α) z-1+αz-2) (1)

[0096] in:

[0097] β is the frequency factor, which is determined by the notch frequency of the notch filter.

[0098] α is the bandwidth factor, determined by the notch filter bandwidth.

[0099] z is a discrete domain...

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Abstract

The invention provides a traction power supply system resonance suppression method and device based on an adaptive notch filter. By adding the adaptive notch filter in a locomotive network-side rectifier control method, a control instruction at oscillation frequency is allowed to be attenuated greatly, and thus generation of system resonance is suppressed through control ability of a locomotive itself; and under the condition of not increasing extra investment, safe and stable operation of a power supply system is ensured. Through the adaptive notch filter, a low-frequency resonant component in a grid-connected current is extracted and multiplied by an appropriate proportion coefficient for attenuation, and then, a component, obtained after low-frequency resonance attenuation in the grid-connected current, is subtracted from a grid-connected instruction current obtained by a DC voltage regulator, so that effects of stabilizing the grid-connected current and voltage and suppressing oscillation are achieved, suppression effect is good, hardware cost is not increased, and no extra investment is caused.

Description

technical field [0001] The present invention relates to a control method and a system device for a traction power supply power supply, in particular to a resonance suppression method and device for a traction power supply system, which are mainly used for harmonic control in the traction power supply system to reduce the influence of harmonics on driving safety The invention belongs to the technical field of traction power supply control. Background technique [0002] With the extensive use of AC-DC-AC electric drive locomotives in electrified railways, the harmonic characteristics in the traction power supply system have changed. In addition to low-frequency harmonics such as the 3rd, 5th, 7th, and 9th orders, high-frequency harmonics are also very rich. . Studies have shown that when the parameters of the traction power supply system are under certain conditions, the harmonics of the corresponding order can resonate, and the resulting overvoltage and overcurrent will enda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 陶艳
Owner HUNAN RAILWAY PROFESSIONAL TECH COLLEGE
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