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A DC voltage closed-loop control method and a system of a single-phase converter

A technology of closed-loop control and DC voltage, which is applied in the field of power electronics and electric transmission, and can solve problems such as the inability to effectively eliminate the adverse effects of secondary pulsation on the DC side

Active Publication Date: 2019-01-15
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a DC voltage closed-loop control method and system for a single-phase converter, and the purpose is to solve the problem that the prior art cannot effectively eliminate the adverse effects of the secondary pulsation on the DC side of the single-phase AC converter system

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  • A DC voltage closed-loop control method and a system of a single-phase converter

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specific Embodiment approach

[0071] As a specific implementation manner, the above-mentioned voltage feedback signal acquisition module may include:

[0072] The preset sliding window time acquisition unit is used to obtain the preset sliding window time of the sliding average filter;

[0073] The acquisition unit is used to acquire the voltage feedback signal according to the preset sliding window time;

[0074] Wherein, the preset sliding window time is 0.01s or 0.02s.

[0075] As a specific implementation, the first-order equivalent inertial feedback delay link is in, T w is the preset sliding window time.

[0076] As a specific implementation, the transfer model is Among them, the PI controller is The controlled object model is u dcref is the preset voltage, U s is the phase voltage amplitude, C dc is the total capacitance of the DC side.

[0077] As a specific implementation, the integral time constant T of the PI controller I is the integral time constant T of the first-order equiva...

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Abstract

The invention discloses a DC voltage closed-loop control method and a system of a single-phase converter. The voltage feedback signal of the DC side of the single-phase converter which passes througha sliding average filter as a feedback link is collected. Based on the pre-established transfer model of the voltage outer loop closed-loop system of the single-phase converter, the closed-loop control is carried out according to the voltage feedback signal and the preset voltage. The transfer model includes feedback delay, PI controller, current inner loop closed loop system transfer model and controlled plant model. The integral time constant of PI controller is larger than the integral time constant of feedback delay. The transfer model open-loop cutoff frequency is set based on the response speed of the current inner loop being much greater than the response speed of the voltage outer loop. By introducing a moving average filter as a voltage loop feedback link, the secondary ripple component of the voltage signal is effectively separated, the secondary ripple component is avoided from entering the voltage loop, the adverse effect of the secondary ripple is eliminated, and the control stability of the system is ensured.

Description

technical field [0001] The invention relates to the field of power electronics and electric transmission, in particular to a DC voltage closed-loop control method and system for a single-phase converter. Background technique [0002] Single-phase converters are widely used, for example specifically for train power supply. The grid side part of the train power supply traction converter (also known as the four-quadrant converter) mainly realizes the introduction of the railway power catenary power into the train through the pantograph to provide power for the train. [0003] The four-quadrant converter converts the single-phase AC input voltage stepped down by the main transformer into a DC voltage for the intermediate DC circuit. For a single-phase AC system, the secondary pulsation of the input power of the four-quadrant converter will cause the secondary pulsation of the DC side voltage. [0004] In order to eliminate the influence of the secondary pulsation of the DC vol...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M1/14
CPCH02M1/14H02M7/217H02M1/0003
Inventor 许峻峰张志学王跃罗文广刘勇胡景瑜付刚孙璐
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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