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Distributed sub module control method, device and system

A distributed control and seed module technology, which is applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., can solve the sub-module voltage divergence, without considering the dynamic change of the number of sub-modules, input Problems such as the large number of sub-modules achieve the effects of shortening the development cycle, excellent pressure equalization effect, and reducing development costs

Active Publication Date: 2016-07-06
NR ELECTRIC CO LTD +1
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Problems solved by technology

This algorithm requires average grouping, and does not take into account the dynamic changes in the number of normal sub-modules such as sub-module fault bypasses in the running process; in addition, the invention uses the total voltage of each group to calculate the energy balance factor of each group. When the number of modules differs greatly, the submodule voltage diverges, and may cause the calculated number of input submodules to be greater than the normal number of submodules

Method used

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  • Distributed sub module control method, device and system
  • Distributed sub module control method, device and system
  • Distributed sub module control method, device and system

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Embodiment Construction

[0033] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] A sub-module distributed control method, by dividing all sub-modules of each bridge arm of a converter valve into M groups, M≥1, all sub-modules include fault sub-modules and normal sub-modules, and the number of all sub-modules corresponding to each group It can be equal or unequal. The number of normal sub-modules in each group is allowed to change dynamically. Each group corresponds to a valve control device. Each valve control device operates independently. The upper controller sends the number of sub-module inputs to the valve control device. The steps to calculate the number of sub-module inputs are as follows:

[0035] (1) The valve control device obtains the average voltage of the normal sub-module under its jurisdiction Count the number of normal submodules And send it to the upper controller;

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Abstract

The invention provides a distributed sub module control method. The method comprises steps that sub modules of each bridge arm are grouped, each group corresponds to one valve control device, weight of each group is calculated by an upper level control device according to a bridge arm current, the average voltage of each set of normal sub modules and the quantity, the quantity of involved sub modules of each group is calculated through combination with the quantity of involved sub module of the corresponding bridge arm and is issued to the valve control device, and the valve control device realizes operation according to the voltage sharing strategy and the gating method provided in the prior art.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a sub-module distributed control method, device and system. Background technique [0002] With the development of power electronics technology, flexible DC transmission technology based on modular multilevel converters has been widely concerned and applied. The bridge arm of this type of topology adopts the form of cascading basic operating units, avoiding the direct series connection of a large number of switching devices, and there is no problem such as drive consistency, which greatly reduces the technical barriers of DC power transmission. However, because this topology disperses and stores energy in the capacitors of each sub-module of the bridge arm, how to quickly realize the balanced control of the capacitor voltage of each sub-module during operation is one of the difficulties in its implementation. [0003] At present, the sub-module voltage equal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00
CPCH02M7/483H02M1/0003H02M1/325H02M7/4835H02M7/4833H02M1/0009H02M1/00H02M7/00
Inventor 丁久东田杰董云龙李海英曹冬明刘海彬卢宇
Owner NR ELECTRIC CO LTD
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