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High-power thyristor type traction rectifier and braking inverter bidirectional conversion system, and control method

A bidirectional converter and thyristor technology, which is applied in the direction of electric braking system, AC power input conversion to DC power output, output power conversion device, etc., can solve the problem of not filtering out harmonics well and large reactor inductance , unreliability and other problems, to achieve the effect of simple control scheme, strong short-circuit capability, and elimination of harmonics

Pending Publication Date: 2019-03-08
ZHENJIANG DAQO SECHERON TRACTION POWER
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Problems solved by technology

However, this method requires a large inductance of the reactor and a large volume and high cost. It is unreliable and uneconomical to solve the current sharing problem only by hardware. Therefore, the control of parallel current sharing is studied from the software control strategy. method is necessary
At present, as the capacity of power electronic devices continues to increase, more and more quality problems are brought to the power grid. Static reactive power compensation and dynamic reactive power compensation can no longer filter out harmonics well, so the invention can be applied to both The filter reactive power compensation device of the large-capacity rectification and inverter device is very important

Method used

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  • High-power thyristor type traction rectifier and braking inverter bidirectional conversion system, and control method
  • High-power thyristor type traction rectifier and braking inverter bidirectional conversion system, and control method
  • High-power thyristor type traction rectifier and braking inverter bidirectional conversion system, and control method

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Embodiment Construction

[0024] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0025] Such as figure 1 As shown, the high-power thyristor-type traction rectification, braking, inverter, and bidirectional conversion system is mainly composed of AC switchgear, phase-shifting transformer, thyristor bidirectional converter, DC switchgear, and negative isolation switchgear. Thyristor bidirectional conversion system has two purposes of rectification and inverter, which can feed back the braking energy of the train to the medium-voltage AC grid to achieve energy saving, and can also transmit the AC grid to the DC bus to provide electric energy for train traction and stabilize DC. The busbar voltage, using its own overload capacity, can temporarily replac...

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Abstract

The invention discloses a high-power thyristor type traction rectifier and braking inverter bidirectional conversion system, and a control method. The system comprises an alternating-current switch cabinet, a phase-shifting transformer, a thyristor bidirectional conversion device, a direct-current switch cabinet and an isolation switch cabinet; and the thyristor bidirectional conversion device comprises rectifier and inverter units, which are connected in parallel, wherein the rectifier (inverter) unit comprises a filtering and reactive power compensation device, an autotransformer and a thyristor rectifier (inverter) device, which are sequentially connected in series. When two sets of 12-pulse rectifier power supplies are connected in parallel, the purpose that two sets of power suppliesare connected in parallel is achieved through a method for performing current-sharing control by adopting double closed-loop digital PI adjustment; the bidirectional conversion system disclosed by theinvention integrates the functions of energy feedback, traction power supply, steady network voltage, high power supply quality, high overload capacity and the like into a whole; and thus, the comprehensive cost performance of the system is high.

Description

technical field [0001] The invention relates to a high-power thyristor-type traction rectification braking inverter bidirectional conversion system and a control method, and belongs to the technical field of regenerative braking energy absorption and utilization of urban rail transit trains. Background technique [0002] At present, subway trains use a mixed marshalling method of moving trains and trailers. During the braking process of the train, the motor car itself preferably adopts electric braking. When the electric braking force is insufficient, firstly, the mechanical brake of the trailer will make up for it, and secondly, the mechanical brake of the motor car will make up for it if it is insufficient, so as to ensure sufficient Braking force. This electro-pneumatic braking method can realize the conversion of kinetic energy to electric energy during the train braking process, but since the subway power supply system uses a 12-pulse or 24-pulse diode uncontrolled rec...

Claims

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Application Information

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IPC IPC(8): H02M7/757B60L7/10B60M3/06
CPCH02M7/757B60L7/10B60M3/06B60L2200/26Y02T10/72
Inventor 李学安王彬钱小森吴杰朱晓勇朱杰佘军
Owner ZHENJIANG DAQO SECHERON TRACTION POWER
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