Clamp five-level back-to-back converter with flying capacitor auxiliary bridge arms

A technology of back-to-back converters and flying capacitors, which is applied in the conversion equipment for intermediate conversion to DC, conversion of AC power input into AC power output, conversion of AC power input into DC power output, etc., can solve the problem of power semiconductor materials Problems such as manufacturing process and withstand voltage limit limit, etc., to achieve the effect of reducing quantity, reducing harmonic influence, and high withstand voltage level

Active Publication Date: 2015-04-29
北京亚华博信科技有限责任公司
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Problems solved by technology

With the continuous increase of the capacity level of the generator set, the capacity level of the converter must also be increased accordingly, which requires the converter itself and the switching devices to h

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  • Clamp five-level back-to-back converter with flying capacitor auxiliary bridge arms
  • Clamp five-level back-to-back converter with flying capacitor auxiliary bridge arms
  • Clamp five-level back-to-back converter with flying capacitor auxiliary bridge arms

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] The invention discloses a novel five-level back-to-back converter applied to a permanent magnet direct-drive wind power conversion system and a control strategy thereof.

[0029] figure 1 The overall structure diagram of the five-level clamped back-to-back converter is given. The converter includes a 5L-Vienna rectifier connected to the wind turbine side to complete AC-DC conversion; the intermediate DC bus connects the rectifier and the inverter , the connected DC bus capacitor clamps the voltage on both sides; the 5L-NPC inverter completes the DC-AC conversion. In the present invention, a converter is composed of a 5L-Vienna rectifier, a DC bus voltage dividing capacitor, a midpoint balance auxiliary bridge arm and a 5L-NPC inverter, and the use of the 5L-Vienna rectifier as a variable speed controller of a permanent magnet synchronous gener...

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Abstract

The invention discloses a clamp five-level back-to-back converter with flying capacitor auxiliary bridge arms. The converter comprises a 5L-Vienna rectifier, neutral-point balancing auxiliary bridge arms, and a 5L-NPC inverter, wherein the 5L-Vienna rectifier is used as a variable speed controller of a permanent magnet synchronous generator, and higher voltage-withstand grade can be realized by adopting a five-level structure; the number of original parts is reduced, the problem of straight-through short circuit does not exist, the reliability is improved, the unity power factor variable speed control strategy can be realized, and the influences of harmonic waves are reduced since the current of the generator can be controlled to be sine waves; in addition, an auxiliary circuit formed by two three-level flying capacitor auxiliary bridge arms, which are connected in series, is provided for cooperating with modifying of the SVM strategy of the 5L-Vienna rectifier to realize neutral-point balancing, the auxiliary bridges can provide an unbalanced current flow path, and the problem of direct current unbalance is solved by using a voltage clamp principle of a flying capacitor.

Description

technical field [0001] The invention relates to a converter system and a control method thereof, in particular to a control method of a five-level rectifier and a capacitor voltage unbalance control method. Background technique [0002] At present, high-power direct-drive wind power generation systems all adopt the technical solution of direct-drive permanent magnet generator + full-power converter. Among them, the full power converter is used as the interface between the permanent magnet wind turbine and the grid, and its capacity is the same as the rated capacity of the system. With the continuous increase of the capacity level of the generator set, the capacity level of the converter must also be increased accordingly, which requires the converter itself and the switching device to have a higher voltage and power level. However, the manufacturing process of power semiconductor materials and withstand voltage limits, the traditional two-level converter has been unable to ...

Claims

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Application Information

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IPC IPC(8): H02M5/44H02M7/219
CPCH02M5/4585H02M7/487
Inventor 曾翔君张美美骆一萍张晓贺莹莹
Owner 北京亚华博信科技有限责任公司
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