Urban rail train regenerative brake energy absorbing and using system and method

A regenerative braking, urban rail technology, applied in electric braking systems, power management, electric vehicles, etc., can solve the problem of insufficient train regenerative braking energy absorption, large regenerative braking energy power amplitude, and affecting the life of energy storage units and other problems, to avoid the use of energy-dissipating resistors, reduce losses, and improve utilization.

Active Publication Date: 2013-09-18
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] However, due to the frequent starting and braking of trains and the large amplitude of regenerative braking energy (up to 3-6MW), if the energy storage method is used alone, the energy storage unit is required to have a large power and capacity, resulting...

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  • Urban rail train regenerative brake energy absorbing and using system and method
  • Urban rail train regenerative brake energy absorbing and using system and method
  • Urban rail train regenerative brake energy absorbing and using system and method

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specific Embodiment approach

[0030] The energy feedback inverter may adopt a two-level three-phase bridge circuit, a three-level three-phase bridge circuit, three single-phase bridge circuits and the like. this invention Figure 4 A specific implementation is given, which mainly includes: three single-phase inverter bridges based on IGBT modules and three coupling reactors. The AC output side of the inverter bridges is connected to the AC grid in the traction substation through coupling reactors. In addition, it also includes the electrical quantity acquisition circuit, PWM control circuit and IGBT drive circuit necessary to realize the control algorithm.

[0031] The DC / DC bidirectional converter may adopt a bidirectional Cuk converter, a bidirectional half-bridge Buck / Boost converter, and the like. this invention Figure 4 A specific implementation is given, which mainly includes: a bidirectional half-bridge circuit based on IGBT modules (composed of two IGBT devices T1, T2, and two diodes D1, D2) and...

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Abstract

The invention provides an urban rail train regenerative brake energy absorbing and using system. The system comprises an energy feedback inverter, an energy-storing unit, a DC/DC (direct-current/direct-current) bidirectional converter and a direct-current flat-wave capacitor, wherein the direct-current side of the energy feedback inverter and the high-voltage side of the DC/DC bidirectional converter are connected in parallel with the direct-current flat-wave capacitor and are simultaneously connected in parallel with the anode and the cathode of a direct-current bus; the low-voltage side of the DC/DC bidirectional converter is connected with the energy-storing unit; and the alternating-current side of the energy feedback inverter is connected with the low-voltage side of a distribution transformer in a traction substation, and the energy feedback inverter is used for inverting regenerative brake energy on the direct-current bus to be used by electric equipment in the traction substation. The invention also provides a regenerative brake energy absorbing and using method based on the system. The energy feedback inverter and the DC/DC bidirectional converter are coordinated and controlled on the basis of the change status of the voltage of the direct-current bus, the train regenerative brake energy is quickly and fully absorbed, the voltage of the direct-current bus is kept stable, and the utilization rate of the train regenerative brake energy is improved.

Description

technical field [0001] The invention belongs to the field of urban rail transit power supply systems, and in particular relates to a system for absorbing and utilizing regenerative braking energy of urban rail trains. Background technique [0002] Urban rail transit adopts DC traction power supply mode. The DC power supply is obtained through uncontrolled rectifiers in traction substations. There are two voltage levels: DC750V and DC1500V. At present, the traction motors of urban rail trains mostly use AC induction motors, which obtain electric energy from the DC catenary (that is, the DC bus, hereinafter collectively referred to as the DC bus) through the variable voltage variable frequency speed regulation (VVVF) unit. At present, most trains use regenerative braking: when the train starts to brake, the induction motor works as a generator, converting the kinetic energy of the train into electrical energy and feeding it back to the DC bus. When the electric energy fed bac...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/28B60L7/00
CPCY02T10/72
Inventor 尹项根张哲王存平苏玉京唐萍文明浩
Owner HUAZHONG UNIV OF SCI & TECH
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