Capacitance-voltage grouping balance optimization algorithm for modularized multi-level transverter

A modular multi-level, capacitive voltage technology, applied in the field of power transmission and distribution, can solve problems such as too many sorting times and too much calculation of the control system

Active Publication Date: 2015-08-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] Aiming at the problem that the number of sorting times is too many and the amount of calculation of the control system is too large when the sorting method is used to balance the capacitor voltage of the bridge arm sub-modules for a modular multi-level converter with a high level number, the present invention proposes a modular Multilevel Converter Capacitor Voltage Group Balance Optimization Algorithm

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  • Capacitance-voltage grouping balance optimization algorithm for modularized multi-level transverter
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  • Capacitance-voltage grouping balance optimization algorithm for modularized multi-level transverter

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Embodiment Construction

[0016] In the following, the multilevel converter capacitor voltage balance algorithm based on the prime factorization method will be described in detail in conjunction with the accompanying drawings.

[0017] figure 1 is the topological structure of MMC, if the traditional sorting method is used to arrange the bridge arms N sub-module capacitors for voltage equalization, when N When the value is large, the amount of sorting calculation will be very large, the calculation speed of the control system will become very slow, and even the calculation will crash. On the basis of the original capacitance voltage balance method, the present invention optimizes the bridge arm sub-module capacitance voltage balance method according to the idea of ​​integer prime factorization method, and the specific implementation steps are as follows:

[0018] step 1: Carry out prime factorization on the number of submodules of the bridge arm, and group the submodules in multiple layers according...

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Abstract

Disclosed is a capacitance-voltage grouping balance optimization algorithm for a modularized multi-level transverter, and belongs to the technical field of power transmission and distribution. The technical scheme of the invention comprises: firstly, performing prime factorization of a bridge arm sub-module number, and performing multi-level grouping of sub-modules according to the sequence of prime factors from large to small; secondly, according to a current direction of a bridge arm and capacitance-voltage values of sub-modules, and according to the grouping sequence of the multi-level grouping, distributing a turn-on sub-module number level by level till the last level; and finally, by each group distributed at the last level and according to the turn-on sub-module number obtained through the distribution and the current direction of the bridge arm, performing ordering of the capacitance-voltage of the sub-modules to ensure the turn-on sub-modules. The balance algorithm is used under the precondition of normal operation of the transverter; multi-level grouping of bridge-arm sub-modules is performed based on the prime factorization; grouping voltage-sharing of the sub-modules is realized; and the computation burden of a control system is obviously reduced, while the capacitance-voltage of the bridge arm capacitance-voltage is maintained balanced.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a modular multilevel converter capacitor voltage balance optimization algorithm based on a prime factor decomposition method. Background technique [0002] In recent years, high-voltage and high-power fully-controlled power electronic devices such as IGBTs and IGCTs have been widely used in long-distance power transmission systems and low-voltage power distribution networks, especially in high-voltage direct current transmission based on voltage source converters (VSC- HVDC) technology. Compared with the traditional two-level and three-level VSC-HVDC, the topology of the modular multilevel converter (MMC) (sub-module is a half-bridge structure) proposed by Siemens has the advantages of not requiring a large number of IGBTs to be directly connected in series, and the device can withstand voltage The current change rate is low and no filter ...

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Application Information

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IPC IPC(8): H02M7/00
CPCH02M7/49H02M7/4835
Inventor彭茂兰赵成勇郭春义
OwnerNORTH CHINA ELECTRIC POWER UNIV (BAODING)