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Method for voltage equalization of modularized multi-level converter for flexible direct current transmission system

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

Active Publication Date: 2014-09-10
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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  • Method for voltage equalization of modularized multi-level converter for flexible direct current transmission system
  • Method for voltage equalization of modularized multi-level converter for 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-N, 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 period, firstly, the number of conduction modules Narm_...

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Abstract

Provided is a method for voltage equalization of a modularized multi-level converter for a flexible high-voltage direct current transmission system. A control system of the modularized multi-level converter is utilized to perform voltage equalization control on the modularized multi-level converter. According to the voltage equalization method, a converter control protecting system CCP dynamically distributes the number of power modules needing to be connected by each power module grouping control system VGC through a closed loop regulator, a bridge arm current, a symbol judging link and a connecting module number feedback item according to the voltage average value of all the power modules of each bridge arm of the modularized multi-level converter and the voltage average value of the power modules corresponding to some power module grouping control system VGC. According to the method, distributed type balance control of voltage of the corresponding K power modules is achieved through the power module grouping control system VGC, and the converter control protecting system CCP only needs to dynamically calculates and distribute the number of the power modules needing to be connected by the 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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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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