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Bidirectional isolation type energy conversion system and control method thereof

A technology of energy conversion and two-way isolation, applied in control/regulation systems, converting AC power input to DC power output, and converting DC power input to DC power output, etc., can solve the delay in the operation time of EMUs and the inability of EMUs to obtain electric energy And other issues

Inactive Publication Date: 2020-09-11
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the event of an EMU pantograph failure or grid power supply failure, the EMU cannot obtain electric energy and will not be able to walk. It can only temporarily park on the rails and wait for other EMUs to rescue, which brings time delay risks to the operation of the EMU.

Method used

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  • Bidirectional isolation type energy conversion system and control method thereof
  • Bidirectional isolation type energy conversion system and control method thereof
  • Bidirectional isolation type energy conversion system and control method thereof

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Embodiment Construction

[0028] Specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] The present invention considers replacing the charger in the existing vehicle power supply system with a bidirectional energy conversion system to realize mutual conversion between AC and DC, so that when the train is running normally, the bidirectional energy conversion system realizes AC / DC conversion and charges the battery in the forward direction; emergency Under normal circumstances, the DC / AC conversion is realized through the bidirectional energy conversion system, and the stored electric energy is released in reverse to provide emergency power supply. Based on this, the embodiment of the present invention designs a two-way isolated energy conversion system, which replaces the charger and is used in the power supply system of the EMU, such as figure 2 As shown, it includes a three-phase PWM rectifier circuit and a cascaded bidire...

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Abstract

The invention relates to a bidirectional isolation type energy conversion system. The system comprises a three-phase PWM rectification circuit and a cascaded bidirectional active bridge DC / DC conversion circuit. The bidirectional active bridge DC / DC conversion circuit comprises a high-voltage side H bridge, an HSLP high-frequency transformer circuit and a low-voltage side H bridge. One side of thehigh-voltage side H bridge is connected with the three-phase PWM rectifying circuit, and the other side of the high-voltage side H bridge is connected with the high-voltage side of the HSLP high-frequency transformer circuit; and the low-voltage side of the HSLP high-frequency transformer circuit is connected with the low-voltage side H bridge. The system can achieve AC-DC bidirectional conversion, is simple in design, and achieves the lightweight design of equipment. Meanwhile, the invention further provides a corresponding control method. A SVPWM and PWM hybrid control mode is adopted, a three-phase PWM rectification circuit adopts SVPWM control, and a bidirectional active bridge DC / DC conversion circuit adopts PWM control, so that the control stability of the system is improved, and the control reliability of the system can be kept in a voltage full-range conversion mode in the hybrid control mode.

Description

technical field [0001] The technical field of power supply system design of the present invention, in particular, relates to a bidirectional isolated energy conversion system and a control method thereof. Background technique [0002] figure 1 For the existing EMU vehicle power supply topology, the EMU obtains electric energy from the 25kV high-voltage power grid through the pantograph on the roof for energy conversion, which is used to supply power to the traction power supply system and auxiliary power supply system of the EMU. However, in the event of an EMU pantograph failure or grid power supply failure, the EMU cannot obtain power and will not be able to walk. It can only temporarily park on the rails and wait for other EMUs to rescue, which brings time delay risks to the operation of the EMU. [0003] Therefore, for the power supply topology of EMU vehicles in emergency situations, it is considered to replace the charger in the power supply system with a bidirectiona...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M3/335H02J9/06B60L50/60B60L1/00
CPCB60L1/00B60L50/60H02J9/061H02M3/33584H02M7/219Y02T10/70Y02T10/72
Inventor 韩冰杨东军赵许强甄远伟张家明沈壮壮
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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