Secondary pulsation power decoupling method based on DC bus voltage detection

A technology of secondary pulsating power and DC bus capacitance, which is applied in the direction of DC power input conversion to DC power output, AC power input conversion to DC power output, output power conversion device, etc., which can solve the problem of limited suppression effect and complicated control algorithm and other problems to achieve the effect of reducing pulsation and heating, suppressing beat frequency phenomenon, and improving safety and stability

Active Publication Date: 2021-05-28
BEIJING JIAOTONG UNIV +1
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Problems solved by technology

Although no beat frequency control can suppress the beat frequency phenomenon, but the control algorithm is complicate

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  • Secondary pulsation power decoupling method based on DC bus voltage detection
  • Secondary pulsation power decoupling method based on DC bus voltage detection
  • Secondary pulsation power decoupling method based on DC bus voltage detection

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[0054] The following will be combined with figure 1 , figure 2 and image 3 The technical scheme of the present invention is further described.

[0055] The secondary pulsating power decoupling method based on DC bus voltage detection provided by the present invention can be applied to EMUs with Buck bidirectional DC / DC converters to realize active secondary power decoupling. The existing technology calculates the amplitude and size of the secondary pulsating power by detecting the voltage, current and system parameters of the AC side, but this control method is an open-loop control, which is easily affected by parameters; there are also studies that use the method of detecting 4QC input to the DC side The secondary pulsating current and DC voltage are used to calculate the secondary pulsating power, which requires an additional current sensor, which is not convenient for system modification and increases the cost.

[0056] In view of the above technical problems, the pres...

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Abstract

The invention belongs to the technical field of rail transit, and relates to the technical field of energy storage devices of motor train units, in particular to a secondary pulsation power decoupling method based on DC bus voltage detection. A passive LC resonant filter topology is replaced by a Buck-type bidirectional DC/DC converter, actual secondary pulsation power is obtained through detection of DC bus voltage and calculation, a target voltage instruction value of a decoupling capacitor is given accordingly, and active power decoupling is achieved through voltage and current PI double-closed-loop control. According to the method, active power decoupling is realized through the bidirectional DC/DC converter, the stability of the DC bus voltage is ensured, the overall power density of the traction converter is further improved, and lightweight operation of the motor train unit is facilitated; moreover, the method does not need to add a sensor, is easy for system transformation, and is a practical secondary pulsation power decoupling method.

Description

technical field [0001] The invention belongs to the technical field of rail transit, relates to the technical field of energy storage devices of multiple trains, and in particular relates to a method for realizing active power decoupling of multiple trains. Background technique [0002] When a high-speed train is powered by catenary, the single-phase four-quadrant converter will generate secondary pulsating power, which will cause beat frequency phenomenon to the motor, resulting in obvious torque pulsation of the motor. Although the beat frequency control can suppress the beat frequency phenomenon, the control algorithm is complicated and the motor is in the process of dynamic change, so the suppression effect of the beat frequency control is limited. At present, passive LC resonant filters are generally used to realize passive power decoupling to ensure the stability of the DC bus voltage. However, the passive LC resonant filter is bulky and occupies a large space, which ...

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Application Information

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IPC IPC(8): H02M3/158H02M7/219H02M1/34H02M1/088
CPCH02M3/1582H02M7/219H02M1/34H02M1/088
Inventor 陈杰袁德强刘志刚况阳沈来来沈迪章予曦陈天宇苗逸飞吴楠邱瑞昌
Owner BEIJING JIAOTONG UNIV
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