Same-phase power supply system based on single-phase full-bridge diode clamping multilevel back-to-back converter

A diode clamp, back-to-back conversion technology, applied in the direction of converting AC power input to AC power output, electrical components, output power conversion devices, etc. The effect of improving circuit capacity and voltage level, reducing switching stress, and circuit function advantage
CN104796006AInactive Publication Date: 2015-07-22SOUTHWEST JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHWEST JIAOTONG UNIV
Publication Date
2015-07-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a same-phase power supply system based on a single-phase full-bridge diode clamping multilevel back-to-back converter. A secondary winding of an alpha-phase step-down transformer (2) is parallelly connected with an input end of a diode clamping multilevel rectifier through a connecting reactor (5), an output end of the diode clamping multilevel rectifier is parallelly connected with a second winding of a beta-phase step-down transformer (3) through a connecting reactor (5), and parallel output is connected in a traction network to power a load; a signal controller (7) mainly collects load current I load, phase signals of alpha-phase voltage and beta-phase voltage and voltage Vdc of a direct-current side capacitor, and current I alpha and I beta is controlled to be equal through a control circuit, so that balance of three-phase current on a network side is guaranteed. When the same-phase power supply system is applied in high-voltage high-power places, switch stress borne by devices can be lowered, switch loss of the devices is reduced, du / dt, di / dt and output waveform harmonic content during circuit running are lowered, capacity, grade and efficiency of the circuit are improved, and functions of the circuit are enabled to be more advantageous; the whole system is enabled to be small in loss and long in service life, so that maintenance frequency is lowered greatly.
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Description

technical field

[0001] The invention relates to an in-phase power supply system based on a single-phase full-bridge diode clamp multilevel back-to-back converter. Background technique

[0002] The traction load of the electrified railway is a single-phase AC load, which makes the three-phase of the traction power supply system seriously unbalanced and has reactive current. In order to reduce the impact of three-phase unbalance, the balance transformer is connected by commutation, which leads to different voltages in each power supply section, so it must be separated by a phase-splitting insulator. The phase-splitting insulator restricts the smooth and continuous current receiving of the locomotive, and becomes a weak link of power supply, restricting the development of high-speed and heavy-haul railways. The same-phase power supply technology fundamentally solves the problem of electrical phase separation. Through real-time detection of the comprehensive compensation curren...

Claims

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