Optimized MMC sub-module capacitor voltage dynamic equalization control method

A capacitive voltage and dynamic equalization technology, which is applied to electrical components, output power conversion devices, and conversion of AC power input to DC power output. The calculation is too large and the fluctuation consistency is good

Active Publication Date: 2019-05-03
XIAN UNIV OF TECH
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Problems solved by technology

[0007] For overcoming above-mentioned deficiencies in the prior art, the object of the present invention is to provide a kind of optimized MMC sub-module capacitor voltage dynamic equalization control method, to solve the current second type based on MMC sub-module capacitor voltage sorting direct method mentioned in the background technology The large amount of calculation of the control system in the voltage equalization method can reduce the number of actions of the switching tube to a certain extent, thereby reducing the switching loss

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  • Optimized MMC sub-module capacitor voltage dynamic equalization control method
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  • Optimized MMC sub-module capacitor voltage dynamic equalization control method

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[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The following descriptions are for illustrative purposes only, and are not intended to limit the scope of the present invention and its application.

[0032] figure 1 It is the topology diagram of the main circuit of the three-phase modular multilevel converter. It is a classic circuit structure, in which each phase of the three-phase converter is composed of upper and lower bridge arms, and each bridge arm has N MMC sub-modules SM k (k=1,2,3,...,N), a bridge arm inductance L arm ; Each MMC submodule SM k It is a half-bridge structure composed of two switch tubes VT1 and VT2 in series, and a power diode VD1 and VD2 in antiparallel, and then a capacitor C in parallel. In the three-phase conversion circuit, the MMC sub-module SM k There are two normal working states, namely: input state and cut-off state. Wherein, in the input state, the sw...

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Abstract

An optimized MMC sub-module capacitor voltage dynamic equalization control method comprises the following steps of: firstly determining a maximum allowable fluctuation range of a sub-module capacitorvoltage; performing equalization control on current sub-module capacitor voltages on an MMC bridge arm; if a certain sub-module capacitor voltage exceeds the specified maximum allowable fluctuation range, using a sub-module capacitor voltage direct equalization method based on improved sorting; and if all sub-module capacitor voltage on the bridge arm are within the specified range, using a sub-module capacitor voltage equalization control method without the need for sorting. The method can greatly reduce the problem that a control system has a large calculated amount due to the sorting problem.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an optimized dynamic equalization control method for capacitor voltages of MMC sub-modules. Background technique [0002] In recent years, Modular Multilevel Converter (MMC, Chinese name is Modular Multilevel Converter) has been vigorously developed in the fields of high-voltage DC transmission, high-voltage and high-power motor drive due to its many advantages. However, in the process of MMC research and application, there has always been a problem of dynamic balance of the capacitor voltage of the MMC sub-module to be solved, which has caused many scholars at home and abroad to devote a lot of energy to research the dynamic balance control technology of the capacitor voltage of the sub-module. It can be seen that the research on this technology has a very broad scope. application prospects. [0003] With regard to the MMC sub-module capacitor voltage equa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
Inventor 孙向东解飞飞任碧莹张琦陈桂涛
Owner XIAN UNIV OF TECH
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