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Capacitance voltage balancing strategy suitable for high level modular multilevel converter

A modular multi-level, high-level technology, applied in the field of power transmission and distribution, can solve the problems of increased computing and processing time of the controller, unsuccessful computing and processing, and increased sorting calculations, so as to ensure power and avoid repeated opening and closing The effect of breaking the process and reducing the loss of the device

Active Publication Date: 2016-06-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0008] As the number of MMC bridge arm sub-modules increases, the amount of sorting calculations will increase sharply, which will greatly increase the processing time of the controller, resulting in an overburdened controller, which will eventually lead to unsuccessful calculation and processing.

Method used

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  • Capacitance voltage balancing strategy suitable for high level modular multilevel converter
  • Capacitance voltage balancing strategy suitable for high level modular multilevel converter
  • Capacitance voltage balancing strategy suitable for high level modular multilevel converter

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Embodiment Construction

[0062] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0063] figure 1 is a typical topology diagram of a modular multilevel converter MMC. figure 1 In the topology of the modular multilevel voltage source converter (MMC), each phase has two upper and lower bridge arms, and each bridge arm is composed of n half-bridge sub-modules and a bridge arm reactor L. where U dc is the DC side voltage, I arm is the bridge arm current.

[0064] figure 2 It is a structural diagram of the half-bridge sub-module used in the high-voltage direct current transmission MMC-HVDC of the modular multilevel converter. figure 2 , the half-bridge sub-module is composed of two insulated gate bipolar transistors IGBTT 1 , T 2 , two antiparallel diodes D 1 、D 2 And a capacitor, the output ...

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Abstract

The invention discloses a capacitance voltage balancing strategy suitable for a high level modular multilevel converter submodule. A technical scheme is characterized in that bridge arm submodule capacitor voltages are sorted from large to small according to prime factors and each layer grouping is performed, a voltage balance link between groups and a capacitance voltage equalization link in the groups adopt an Hill sorting algorithm so that a sorting speed of a voltage balancing link is improved; and simultaneously, a halfway grouping mixing sorting algorithm is designed to reduce a power device switch frequency. The strategy is applied in a modular multilevel voltage source converter. Under the condition that there are a large quantity of bridge arm submodules, functions of increasing a submodule capacitance voltage sorting speed and reducing system simulation time are possessed; a complexity of the sorting algorithm is effectively reduced; the switch frequency of thesubmodule power device is decreased and system switch losses are reduced.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a capacitor voltage equalization strategy suitable for high-level modular multi-level converters. Background technique [0002] Modular multilevel converter based HVDC (MMC-HVDC) is an important branch of voltage source converter HVDC VSC-HVDC in the field of multilevel. It has the advantages of independent control of active power and reactive power, large number of output voltage levels (low harmonic content), modular design, redundant control, low switching frequency and power supply to passive networks. In addition, MMC has low switching loss and strong fault ride-through capability, and is more suitable for the field of flexible DC transmission. Therefore, it has broad application prospects in large-scale wind power grid integration, urban distribution network capacity expansion, power trading, and grid interconnection. . [0003] Com...

Claims

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Application Information

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IPC IPC(8): H02M7/219
Inventor 赵成勇许建中何智鹏苑宾
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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