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Online loss calculation method for modular multilevel converter

A modular multi-level, calculation method technology, applied in the field of power transmission and distribution

Inactive Publication Date: 2012-07-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Therefore, it is necessary to find a loss calculation method that can be applied to any situation. At present, there is no systematic research on the online loss calculation method of modular multilevel converters. Therefore, with the wide application of engineering practice, choose the appropriate The simulation environment PSCAD / EMTDC has an urgent demand and necessity for in-depth research on the online loss calculation method of modular multilevel converters. This will not only have great theoretical innovation significance, but also have important practical engineering value

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  • Online loss calculation method for modular multilevel converter
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  • Online loss calculation method for modular multilevel converter

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Embodiment Construction

[0073] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0074] The technical problem to be solved by the present invention is to overcome the deficiencies in the reduced applicability of the modular multilevel converter loss calculation theory and empirical formulas when the system operating state changes, such as when the modulation degree changes or the system fails, under PSCAD / EMTDC , providing an efficient and real-time general platform for online loss calculation of modular multilevel converters

[0075] Under the PSCAD / EMTDC, the invention realizes the on-line loss calculation of the modularized multilevel converter through a switching frequency measurement module, a duty ratio measurement module, a duty ratio average solution module and a loss calculation module.

[0076] Such as figure 1 As shown, the modular multilevel converter is composed of A-phase bridge arm, B-phase bridge arm and C-phase bridge ar...

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Abstract

The invention discloses an online loss calculation method for a modular multilevel converter (MMC), and belongs to the field of power transmission and distribution. The method comprises the following steps of: 1) calculating the conduction loss of two insulated gate bipolar transistors (LGBT) and two flywheel diodes in each sub-module (SM); 2) calculating the switching loss of the two IGBTs and the reverse recovery loss of the two flywheel diodes in each SM; and 3) calculating related loss by using a loss calculation module. The method has the advantages that: 1, the complexity of manual measurement and calculation is effectively avoided when the MMC has a great number of modules, workload is greatly reduced, and the method is fast and convenient; 2, the online calculation of the loss of the MMC is realized, and the method is wide in application range, and can be applied to the loss calculation of an MMC system in any operating state; and 3, modular packaging is facilitated, a floor area is saved, the utilization rate of resources is increased, and the output of a platform comprises various kinds of loss and loss ratios, so that the method is direct and clear, and staff can conveniently observe the running state of the system at any time.

Description

technical field [0001] The invention belongs to the field of power transmission and distribution, in particular to a method for calculating online loss of a modular multilevel converter. Background technique [0002] In recent years, in order to meet the increasing demand of economic growth for power supply, the voltage source converter (Voltage Source Converter, VSC for short) based on high-power fully-controlled power electronic devices has been widely used in high-voltage direct current transmission ( High Voltage Direct Current (HVDC for short) technology, and has achieved good operating performance, called flexible direct current transmission technology (VSC-HVDC). However, the loss of this system (using flexible DC transmission technology) is far greater than the loss of the traditional DC transmission system, which is mainly due to the large converter loss caused by the flexible DC transmission technology, especially the two-level and three-level Although the topolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12
Inventor 赵成勇杨柳肖湘宁许建中
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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