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Voltage Equalization Method for Modular Multilevel Converter Based on Fuzzy Control

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 risk of increasing the safe and reliable operation of the system, module capacitor voltage fluctuations, etc. question

Active Publication Date: 2017-03-15
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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  • Voltage Equalization Method for Modular Multilevel Converter Based on Fuzzy Control
  • Voltage Equalization Method for Modular Multilevel Converter Based on Fuzzy Control
  • Voltage Equalization Method for Modular Multilevel Converter Based on Fuzzy Control

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Embodiment Construction

[0023] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0024] figure 1 For the topology of the modular multilevel converter (MMC), 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. The positive and negative intervals of the bridge arm current are equally divided into 3 domains of discourse. In order to simplify the calculation, the simplest triangular and trapezoidal membership functions are selected for each domain interval, and the number of modules corresponding to the membership function is rotated N. max , N min and N nom Determined according to the system capacity and the number of bridge arm modules, generally 0≤N min ≤2, 1≤N...

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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 voltage equalization control method for a modularized multilevel converter module of a flexible high-voltage direct current transmission system based on fuzzy control. Background technique [0002] In recent years, the flexible HVDC transmission system based on Voltage Source Converter (VSC) has been widely used in HVDC due to its many advantages, such as better flexibility, controllability, small filter, and ability to supply power to passive networks. The field has received more and more attention. Especially in recent years, the Modular Multilevel Converter (MMC) has been proposed. Its modular design makes it very easy to increase the voltage, which injects new vitality into the flexible HVDC transmission, and also makes the multi-terminal flexible Direct current transmission is easy to implement. Up to now, more than 20 flexible DC transmission projects have been put into operation around the world, including the ±160kV...

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Application Information

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Patent Type & Authority Patents(China)
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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