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Oscillation suppression method and system based on selective virtual harmonic resistor

A selective and harmonic technology, applied in the control system, vector control system, motor generator control and other directions, can solve the problems of compensation or limited design and application, and achieve the effect of suppressing unstable oscillation and improving stability

Inactive Publication Date: 2021-01-22
CHENGDU YUNDA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the technical problems of overcompensation or limited design and application in the existing instability suppression technology, the present invention provides an oscillation suppression method based on selective virtual harmonic resistance, so as to stabilize the voltage and current of the traction network side and improve traction Converter-motor input impedance characteristics improve the stability of the grid-vehicle system

Method used

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  • Oscillation suppression method and system based on selective virtual harmonic resistor
  • Oscillation suppression method and system based on selective virtual harmonic resistor
  • Oscillation suppression method and system based on selective virtual harmonic resistor

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Embodiment 1

[0077] This embodiment proposes an oscillation suppression method based on selective virtual harmonic resistance, such as figure 1 As shown, the method of the present embodiment includes the following steps:

[0078] Step S1, obtain the oscillation voltage of the DC side of the subway traction drive system, and obtain the oscillation frequency through Fourier analysis of the DC side voltage; according to the selective virtual harmonic resistance suppression strategy and the equivalent circuit of the DC side of the subway traction drive system, construct a Selective Virtual Harmonic Resistance Instability Suppression System. The specific construction process is as follows:

[0079] According to the Park transformation, the dq axis current component i sd i sq , motor frequency ω s , the feed-forward voltage component E sd with E sq The calculation formula is

[0080]

[0081] where R s is the stator resistance, σ=1-L m 2 / L s L r , L s is the stator inductance, L...

Embodiment 2

[0107] Based on the above embodiments, this embodiment proposes an oscillation suppression system based on selective virtual harmonic resistance, such as figure 2 As shown, the system of this embodiment includes an instability suppression system building block, a voltage compensation parameter calculation module, and an output module.

[0108] The building block of the instability suppression system in this embodiment is used to obtain the oscillation voltage on the DC side of the subway traction drive system, and obtain the oscillation frequency by performing Fourier analysis on the DC side voltage; according to the selective virtual harmonic resistance suppression strategy and the subway traction drive The equivalent circuit of the DC side of the system is constructed based on the selective virtual harmonic resistance instability suppression system.

[0109] Such as figure 2 As shown, the building block of the instability suppression system in this embodiment includes a s...

Embodiment 3

[0125] Simulation tests are carried out on the oscillation suppression method and system based on the selective virtual harmonic resistance proposed in the above embodiments, based on the hardware structure of the DSP controller model TMS320F28335 RT-LAB hardware-in-the-loop test platform.

[0126] Such as image 3 The structure diagram of the subway traction drive system is shown, which can be simplified as Figure 4 The simplified equivalent circuit of the DC-AC traction drive system is shown. By obtaining the oscillation voltage on the DC side of the subway traction drive system and obtaining the oscillation frequency through Fourier analysis, according to Figure 5 The selective virtual harmonic resistance equivalent diagram shown, Figure 6 The selective virtual harmonic resistance control strategy shown in the figure and the equivalent circuit of the DC side of the subway traction drive system are used to construct a selective virtual harmonic resistance instability su...

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Abstract

The invention discloses an oscillation suppression method and a system based on a selective virtual harmonic resistor, and the method comprises the following steps: constructing an instability suppression system based on the selective virtual harmonic resistor according to a selective virtual harmonic resistor suppression strategy and a direct-current side equivalent circuit of a subway traction transmission system; according to the constructed characteristic equation based on the instability suppression system based on the selective virtual harmonic resistor, and a system asymptotic stabilitycriterion, calculating to obtain a voltage compensation parameter under a synchronous rotating coordinate system meeting a stability criterion condition; and inputting the calculated voltage compensation parameters under the synchronous rotating coordinate system into a compensation link of the subway traction transmission system, thereby suppressing the instability oscillation of the direct current side. According to the method, a vibration suppression strategy based on the selective virtual harmonic resistor is adopted, compensation parameters are introduced, and the compensation parametersenable the system to just meet the stability criterion condition of a characteristic equation, so that instability oscillation can be effectively suppressed, and the stability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of DC side instability oscillation suppression of urban rail DC-AC traction transmission system, and in particular relates to an oscillation suppression method and system based on selective virtual harmonic resistance. Background technique [0002] Due to the continuous investment in the construction and operation of urban rail transit in major cities in China, the stability of the subway traction drive system has been closely watched, and its oscillation suppression strategy has become a research hotspot. The core power of the subway train comes from the subway traction drive system, and its system stability is related to the quality of the subway operation. Most of the subway traction drive system is powered from the DC catenary through the pantograph, and supplies power to the converter through the filter reactor and the supporting capacitor. However, due to the influence of vehicle capacity space, weigh...

Claims

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Application Information

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IPC IPC(8): H02J1/00H02P21/05H02P27/06
CPCH02J1/00H02P21/05H02P27/06
Inventor 陈溉泉葛兴来蒋朝勃孙伟鑫蒲俊楷杨静
Owner CHENGDU YUNDA TECH CO LTD
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