Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter)

A single-phase AC, AC-DC technology, applied in the direction of converting AC power input into AC power output, AC power input into DC power output, output power conversion device, etc., can solve the problem of increased investment, complex structure, medium and high frequency Transformer volume reduction and other issues, to achieve the effect of reducing land occupation and investment, high capacity utilization, and reducing losses

Inactive Publication Date: 2014-09-10
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is to adopt AC-DC conversion + medium-high frequency transformer + AC-DC conversion method, which is called power electronic transformer (PET, power electronic transformer) or solid-state transformer (SST, solid-state transformer), and the medium-high frequency transformer realizes v

Method used

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  • Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter)
  • Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter)
  • Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter)

Examples

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Example Embodiment

[0021] Example

[0022] figure 1 It is shown that a specific implementation of the present invention is: six MMC bridge arms BA a1 , BA a2 , BA 1 , BA 2 , BA b1 , BA b2 Each MMC bridge arm is composed of p power modules PM with the same structure in series with an inductor L; the power module PM is a single-phase half-bridge structure, consisting of an IGBT half-bridge (including T 1 , T 2 ) And a DC energy storage capacitor C 0 Composition; MMC bridge arm BA a1 With BA a2 , BA 1 With BA 2 , BA b1 With BA b2 After series connection, a common DC port is shared internally, MMC bridge arm BA a1 With BA a2 Middle point draw out terminal a, BA 1 With BA 2 Mid-point draw out terminal x, BA b1 With BA b2 With the terminal b drawn out at the midpoint, the six MMC bridge arms form a three-phase connection and form two single-phase AC ports ax and bx, a total of one terminal x; the two single-phase AC ports share two of the six MMC bridge arms. Arm BA b1 And BA b2 .

[0023] The voltage phase...

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Abstract

The invention discloses a single-phase direct-hanging AC-DC-AC converting system based on a MMC (Modular Multilevel Converter), which is formed by six MMC bridge arms in connection. P power modules with the same structures and an MMC bridge arm inductor L are connected in series to form each MMC bridge arm; the power module has a single-phase half-bridge structure and is formed by an IGBT half bridge and a DC energy storage capacitor; the six MMC bridge arms are in a three-phase connection and form two single-phase AC ports; and the two single-phase AC ports share the two MMC bridge arms in the six MMC bridge arms. The voltage phase difference of the two single-phase AC ports is 90 DEG, and the capacity of each sharing MMC bridge arm is the square root of 2 times of the capacity of the remaining MMC bridge arms. According to the single-phase direct-hanging AC-DC-AC converting system based on a MMC (Modular Multilevel Converter), voltage conversion and active power transfer between the two single-phase AC ports can be realized, the two single-phase AC ports can compensate reactive power respectively, and the system can be applied to frequency conversion occasions; a traction and matched transformer can be omitted, the occupied area and the investment can be reduced, the loss is reduced, and the efficiency is improved; and the system of the invention is advanced in technology, reliable and easy in implementation.

Description

technical field [0001] The invention relates to an MMC-based single-phase direct-connected AC-DC converter system, in particular to the technical fields of AC electrified railways and power electronics. Background technique [0002] With the rapid development of technology, the technology of power electronic devices to achieve voltage conversion and power transmission has been widely valued and applied. Compared with transformers, it has some obvious advantages: small size, less land occupation; output voltage amplitude remains constant (does not vary with load ), and can be adjusted smoothly; the current, voltage, and power are well controllable; the power factor is adjustable; it has the function of a circuit breaker, which can quickly limit and cut off faults, etc. There is also the performance that the transformer does not have - it can change the frequency and phase. [0003] There are two types of AC voltage conversion and power transfer realized by power electronics ...

Claims

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Application Information

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IPC IPC(8): H02M5/458
CPCH02M5/4585H02M7/4835
Inventor 李群湛郭育华郭锴解绍锋夏焰坤李亚楠
Owner SOUTHWEST JIAOTONG UNIV
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