Three-phase-single-phase power electronic converter system and rectifier fault tolerance method thereof

A technology of power electronics and three-level rectification, applied in the direction of converting AC power input to AC power output, electrical components, output power conversion devices, etc., can solve the problem of increasing switching frequency, reducing system reliability, and reducing the life of power switching devices And other issues

Pending Publication Date: 2020-06-12
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, the switching pulse sequence SSi leapfrog jumps, and each DC link charges and discharges the capacitor within one modulation wave cycle. These shortcomings will lead to the single-phase three-level cascaded inverter on the output side. The switching frequency increases, reducing the life of the power switching device, increasing the false conduction rate of the power switching device, and reducing the reliability of the system

Method used

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  • Three-phase-single-phase power electronic converter system and rectifier fault tolerance method thereof
  • Three-phase-single-phase power electronic converter system and rectifier fault tolerance method thereof
  • Three-phase-single-phase power electronic converter system and rectifier fault tolerance method thereof

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Embodiment 1

[0076] Such as figure 1 It is a topological structure diagram of a single traction substation in a through-type in-phase power supply system. Since the present invention realizes fault tolerance by deploying the switching pulse sequence of the back-end single-phase three-level cascaded inverter module, the second This technical solution mainly studies the topology of the back-end single-phase three-level cascaded inverter; it includes multi-winding transformers, three-phase three-level rectifiers, isolating switch banks, DC links, cascaded inverter modules and control circuits; all The cascaded inverter modules are cascaded to form a single-phase three-level cascaded inverter.

[0077] The primary winding of the multi-winding transformer is connected to the three-phase power grid; the multi-winding transformer is equipped with n secondary windings, and each secondary winding is connected to a three-phase three-level rectifier, isolating switch group, DC link, cascaded Inverte...

Embodiment 2

[0091] The embodiment of the present invention provides a fault tolerance method for the three-phase three-level rectifier in the converter system in the above-mentioned embodiment 1, such as figure 2 As shown, the structure involved includes an independent DC power supply, a DC link, the main circuit of the cascaded inverter module, and the control circuit; the input side of each cascaded inverter module is connected to an independent DC power supply to simulate The front-end three-phase three-level rectifier, each independent input DC power supply and the single-phase three-level cascaded inverter are connected in series with the isolation switch group K i (the i-th module), to simulate the isolation switch group to prevent the failure of the three-phase three-level rectifier from affecting the back-end equipment.

[0092] Such as image 3 Shown is a schematic diagram of the rectifier fault tolerance method provided by the present invention. When a fault occurs in a three-...

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Abstract

The invention discloses a three-phase-single-phase power electronic converter system and a rectifier fault tolerance method thereof. On the basis of a traditional three-phase-single-phase power electronic converter, an isolation switch group is added, the risk that rear-end equipment is damaged due to faults of a three-phase three-level rectifier to cause output instability of a traction network is reduced, the robustness of a single-phase three-level cascaded inverter is improved, and stable output of the traction network is guaranteed. During fault tolerance, the problems of override jump ofa switching pulse sequence SSi and unbalanced charging and discharging time of a direct current capacitor in a direct current link are fully considered. Fault-tolerant operation after a system faultis realized by utilizing charging and discharging of a direct-current capacitor to the greatest extent. The reliability of system operation is enhanced, the stability range of the system after fault tolerance is broadened, even if an extremely severe fault state occurs, i.e., after the three-phase three-level rectifier of a certain module completely quits operation due to a fault, the normal and stable operation of the system can still be ensured, and the network voltage of the traction network is not influenced by the fault.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a three-phase-single-phase power electronic converter system and a rectifier fault tolerance method thereof. Background technique [0002] At present, in order to solve the problems of dead zone, low power quality, and difficulty in cross-area power supply caused by electric phase separation in my country's existing electrified railway power supply system, some scholars have proposed a through-type railway power supply system with the same phase power supply. Using multi-winding transformers and three-phase-single-phase power electronic converters to replace the iron-core transformers in the original traction substations, combined with power electronic control technology, the entire line of the traction network can cancel the electric phase splitting device, and maintain the voltage phase of the entire network, Amplitude and frequency are the same. The thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02M1/32
CPCH02M1/32H02M5/4585H02M1/325
Inventor 何晓琼余昊伦韩鹏程刘梓舒泽亮
Owner SOUTHWEST JIAOTONG UNIV
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