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
CN105656330AActive Publication Date: 2016-06-08NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Publication Date
2016-06-08

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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.
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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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