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Method for controlling DC (Direct-Current)-side voltage ripple of railway power regulator

A technology of power regulator and DC side voltage, applied in output power conversion device, AC network to reduce harmonics/ripples, electrical components, etc., can solve problems such as abnormal operation of devices, and achieve negative sequence and harmonic improvement , Eliminate the effect of the second fluctuation amount and the third harmonic current

Inactive Publication Date: 2013-06-12
马伏军
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Problems solved by technology

If the secondary ripple voltage is introduced into the DC side voltage control loop of the system, a command signal of the third harmonic will be output, which will cause the railway power regulator to output the third harmonic current, which will cause abnormal operation of the device

Method used

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  • Method for controlling DC (Direct-Current)-side voltage ripple of railway power regulator
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  • Method for controlling DC (Direct-Current)-side voltage ripple of railway power regulator

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Embodiment Construction

[0029] Such as figure 1 As shown, the compensation object of the railway power conditioner 4 based on the full bridge structure is a high-speed railway power supply system using a three-phase V / V traction transformer 1 . The railway power conditioner 4 based on the full bridge structure includes two single-phase step-down transformers 2 and a back-to-back H-bridge single-phase inverter module 3 . The back-to-back H-bridge single-phase inverter modules are connected together through the DC side capacitor, and the AC side is connected to the secondary side of the two single-phase step-down transformers through the filter inductor. The primary sides of the two single-phase step-down transformers are respectively connected to the two single-phase traction power supply arms of the V / V traction transformer.

[0030] Define the power supply arm connected to the ac terminal of the secondary side of the three-phase V / V traction transformer in the figure as α phase, and the other arm a...

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Abstract

The invention discloses a method for controlling DC (Direct-Current)-side voltage ripple of a railway power regulator. According to the power balance principle for the DC side of the railway power regulator, a situation that a secondary ripple voltage exists at the DC side of the railway power regulator can be extrapolated, and the value of voltage ripple is related to the fluctuation of the power at an AC (Alternating Current) side; if the secondary ripple voltage is introduced into a voltage control loop at the DC side, a command signal of triple-frequency harmonics can be output, so that the railway power regulator outputs a current of triple-frequency harmonics, and the abnormal operation of a device can be caused. According to the method for controlling the DC-side voltage ripple provided by the invention, by virtue of the analysis on the power balance model of the railway power regulator, the value of the secondary voltage ripple at the DC side can be extrapolated, so that a reverse secondary voltage ripple component can be superposed on the voltage control loop, the influence is eliminated, and the normal stable operation of the device is realized.

Description

technical field [0001] The invention relates to a DC ripple control, voltage outer loop control, and current inner loop control method for a railway power regulator, in particular to a DC side voltage ripple control method for a railway power regulator. Background technique [0002] With the development of electrified railway towards high speed, high power and load, the power quality of its electric traction transformer becomes more and more critical. Because the high-speed railway traction power supply system adopts single-phase power supply mode, negative sequence current is generated, which brings serious harm to the operation of power generation, transmission and transformation equipment in the power system, such as increasing the loss of generators, reducing the output of transformers, etc., seriously affecting Safe and economical operation of power systems. In addition, the harmonics generated by high-speed railway electric locomotives also reduce the reliability of i...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02M1/12
CPCY02E40/40
Inventor 马伏军毕然
Owner 马伏军
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