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Fuzzy control-based modular multilevel converter voltage equalizing method

A modular multi-level, fuzzy control technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the module capacitor voltage fluctuation, increase the risk of safe and reliable operation of the system, etc. question

Active Publication Date: 2015-09-09
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

However, this method will lead to obvious fluctuations in the voltage of the module capacitors, especially in the application of high-voltage and large-capacity flexible DC transmission projects. The large bridge arm current will cause the voltage of the module capacitors that have been put into operation for a long time to become very high, which increases system safety. risk of reliable operation

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  • Fuzzy control-based modular multilevel converter voltage equalizing method
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  • Fuzzy control-based modular multilevel converter voltage equalizing method

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] figure 1 It is a modular multilevel converter (MMC) topology. Each phase of the modular multilevel converter consists of two upper and lower bridge arms, and each bridge arm includes a reactor L arm and N power modules SM connected in series 1 -SM N , N≥1.

[0025] figure 2 is the domain division of the bridge arm current and the membership function of the corresponding domain. Divide the positive and negative intervals of the bridge arm current into three discourse domains on average. In order to simplify the calculation, the simplest triangular and trapezoidal membership function is selected for each discourse domain interval, and the number of module rotations corresponding to the membership function is N max , N min and N nom Determined according to the system capacity and the number of bridge arm modules, generally 0≤N min ...

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Abstract

Provided is a fuzzy control-based modular multilevel converter voltage equalizing method. According to the invention, numbers of modules put into the period are calculated according to a converter control and protection system; a valve control system calculates the cut modules put in the former period, calculates numbers which should be put into / cut and alternated in this period according to the bridge arm current direction and bridge current size of this period, and calculates numbers of modules which should be alternated according to the bridge arm current value and the subordinating degree function in the bridge arm current intra-area, thereby adjusting numbers of modules which should be alternated in real time and performing voltage equalizing control for a modular multilevel converter.

Description

technical field [0001] The invention relates to a fuzzy control-based voltage equalization control method for a modular multilevel converter module of a flexible high-voltage direct current transmission system. Background technique [0002] In recent years, the flexible HVDC transmission system based on Voltage Source Converter (Voltage Source Converter, VSC) has been widely used in HVDC transmission due to its advantages of better flexibility, controllability, small filter, and ability to supply power to passive networks. field has received increasing attention. Especially in recent years, the modular multilevel converter (Modular Multilevel Converter, MMC) has been proposed. Its modular design makes it very easy to increase the voltage, injecting new vitality into the flexible HVDC transmission, and also makes the multi-terminal Flexible DC transmission is easy to implement. Up to now, more than 20 flexible direct current transmission projects have been put into operatio...

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Application Information

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IPC IPC(8): H02M7/483
Inventor 李耀华赵聪李子欣高范强徐飞罗永捷
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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