Voltage equalization method for modular multilevel converters in flexible direct current transmission system

A modular multi-level, power transmission system technology, applied in the direction of DC power input conversion to DC power output, DC network circuit devices, control/regulation systems, etc., can solve problems such as voltage drop

Active Publication Date: 2016-08-24
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

However, after a power module failure occurs in a bundled module group, the voltage of the bundled module group will be significantly lower than the voltage of the rest of the bundled module groups, resulting in problem appear
Therefore, this method is also not suitable for the case of a power module failure within a bundled module group

Method used

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  • Voltage equalization method for modular multilevel converters in flexible direct current transmission system
  • Voltage equalization method for modular multilevel converters in flexible direct current transmission system

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] figure 1 is the architecture diagram of the control system of the modular multilevel converter, figure 1 The control system of the modular multilevel converter shown includes the converter control and protection system CCP that controls the macroscopic electrical quantity of the entire converter and the M power module group control systems VGC-1 and VGC-1 that control some power modules. 2, ..., VGC-M, M is a positive integer. Each power module group control system VGC is responsible for the voltage balance control of K power modules, where K is a positive integer.

[0021] figure 2 It is a flow chart of the specific implementation of the voltage equalization method of the present invention in the converter control and protection system CCP. In each voltage equalization control cycle, the number of conduction modules N of each bridg...

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Abstract

A voltage equalization method for a modular multilevel converter of a flexible high-voltage direct current transmission system, using the control system of the modular multilevel converter to control the voltage equalization of the modular multilevel converter; the voltage equalization Method The converter control and protection system CCP is based on the average voltage of all power modules of each bridge arm of the modular multilevel converter and the average voltage of the power module corresponding to a certain power module group control system VGC, through a closed-loop Regulator, bridge arm current, symbol judgment link and number of turned-on modules feed-forward item dynamically allocate the number of turned-on power modules required by each power module group control system VGC. In this method, the power module group control system VGC realizes the distributed balanced control of the corresponding K power module voltages, and the converter control and protection system CCP only needs to dynamically calculate and allocate the number of power modules that need to be turned on for each VGC .

Description

technical field [0001] The invention relates to a voltage equalization control method of a power module in a modular multilevel converter of a flexible high-voltage direct current transmission system. Background technique [0002] In recent years, the high-voltage flexible direct current transmission system (VSC-HVDC) based on the voltage source converter (Voltage Source Converter, VSC) has been widely used in the power transmission field due to its advantages of four-quadrant operation, small filter, and the ability to supply power to passive networks. received widespread attention. The emergence of the Modular Multilevel Converter (MMC) has injected new vitality into the development of flexible DC transmission, and also made the multi-port DC transmission system easy to implement. [0003] Modular multilevel converters for flexible direct current transmission systems contain a large number of power modules inside. In order to ensure the stable operation of the modular mu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02J1/00
Inventor 李子欣王平高范强徐飞李耀华
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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