A three-phase double-T five-level converter and its control method

A control method and five-level technology, applied in the direction of converting AC power input to DC power output, electrical components, and output power conversion devices, etc., can solve the problems of large volume, large control complexity, complex structure, etc. High reliability, easy expansion level, and high equivalent switching frequency

Active Publication Date: 2018-11-16
SOUTHEAST UNIV
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Problems solved by technology

[0005] Purpose of the invention: In order to solve the problems of complex structure, large volume and high control complexity of traditional multi-level converters, the present invention discloses a three-phase double-T five-level converter and its control method, which simplifies The multi-level converter structure is improved, the number of power switching devices used is reduced, its size and cost are reduced, and the system structure is more optimized

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  • A three-phase double-T five-level converter and its control method
  • A three-phase double-T five-level converter and its control method
  • A three-phase double-T five-level converter and its control method

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Embodiment Construction

[0035] The present invention will be further explained below in conjunction with the accompanying drawings.

[0036] figure 1 (a), figure 1 (b) and figure 1 (c) shows the topology diagrams of three traditional five-level converters of diode clamp type, flying capacitor clamp type and cascaded H-bridge type respectively.

[0037] figure 2Shown is the topology of the three-phase double-T five-level converter proposed by the present invention. The converter is composed of three-phase double-T bridge arms and a DC bus 1 connected in parallel, wherein each phase bridge arm is composed of two three-voltage The flat-T converter topology is combined with two electrolytic capacitors connected in series. The three-phase double T-shaped bridge arms are respectively the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm with the same circuit structure; Point clamping bridge arm 24, right middle point clamping bridge arm 23 and lower half bridge bridge arm 25;

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Abstract

The invention discloses a three-phase double T-type five-level converter and a control method thereof. Each bridge arm of the converter is composed of two three-level T-type converter bridge arms and two electrolytic capacitors connected in series. evolved. Therefore, the converter has the advantages of small conduction loss and high efficiency of the three-level T-type converter. Compared with the traditional five-level converter, the three-phase double-T five-level converter uses fewer power switching devices and can generate 9 different switching states, so redundant switching states can be utilized, while Output the desired level voltage and control the balance of the flying capacitor voltage. The control method based on multi-carrier in-phase stacked SPWM modulation technology is adopted, so that the converter has better output power quality and higher efficiency. When the power switch tube fails, the converter can also use the redundant switch state for fault-tolerant operation, so the three-phase double T-type five-level converter is more suitable for occasions that require high reliability and efficiency.

Description

technical field [0001] The invention relates to the field of power electronic multilevel converters, in particular to a three-phase double T-type five-level converter and a control method thereof. Background technique [0002] Since the birth of power electronics technology in the 1950s, after nearly half a century of rapid development, it has been widely used in various fields that require power conversion. The concept of multilevel converter was first proposed by A.Nbaae et al. at the 1980 IAS annual meeting. Among them, the multi-level voltage source converter has become a hot spot for high-voltage and high-power applications due to its good characteristics such as various control methods, low output current harmonic content, and high inverter efficiency. R.H.Baker first proposed the concept of cascaded H-bridge multilevel converter in 1975; Japanese scholars A.Nabae, H.Akagi and others proposed a midpoint clamped multilevel PWM inverter in 1983; T.A.Meynard proposed th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/487H02M7/5387
CPCH02M7/483H02M7/487H02M7/53873H02M7/4835H02M1/0095H02M7/4837
Inventor 张建忠徐帅胡省姜永将
Owner SOUTHEAST UNIV
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