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Control method of modular multi-level current converter

A modular multi-level, control method technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve uncontrollable, slow response to abnormal system conditions, and short system question

Active Publication Date: 2016-03-09
HUNAN UNIV
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Problems solved by technology

If the method of predicting the capacitor voltage is used in the normal operation of the system, the system is in a transient uncontrollable state, and the response to abnormal conditions of the system is slow, and the reliability of the system will be affected.

Method used

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  • Control method of modular multi-level current converter
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  • Control method of modular multi-level current converter

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Embodiment Construction

[0068] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0069] figure 1 It is a topological structure diagram of a modular multilevel converter, which is composed of three-phase bridge arms. Each phase contains two upper and lower bridge arms, and each bridge arm contains 2 N The same sub-module and a filter inductor L. The sub-module consists of two IGBTs and an energy storage capacitor.

[0070] figure 2 It is a schematic diagram of sub-module grouping of the upper bridge arm of phase A. In this implementation example, the value of N is 3, the inductance value L is 2.8mH, the capacitance value C is 2800uH, and the DC side voltage U ...

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Abstract

The invention discloses a control method of a modular multi-level current converter. According to the control method, 2N sub modules of a bridge arm is divided into N+1 module groups according to 20, 21, 22, and so on, and 2N-1, and 1, and during work, intra-group sub modules in each group are kept the same in state, namely being simultaneously turned on or turned off. Each group is configured with a voltage sensor used for measuring the voltage value of the group. According to such a structure, a voltage stability control method, a voltage recording method, a modulation method and an even pressure control method are designed. Voltage stability control adopts a PI adjustor to stabilize the sum of capacitor voltage of all sub modules of all phases; the voltage recording method is used for saving voltage values of all the module groups; the modulation method is used for determining the on-off state of each module group; even pressure control is used for keeping the average value of the sub modules of a component to be balanced. According to the control method provided by the invention, a control way of grouping sub module groups is adopted, voltage transformers required in an MMC system are greatly reduced, and further, hardware complexity of the system is reduced and the cost of MMC is reduced.

Description

technical field [0001] The patent of the invention belongs to the field of flexible direct current transmission, and in particular relates to a method for controlling a modular multilevel converter. Background technique [0002] Flexible DC transmission technology is an effective way to build a flexible, strong and efficient power grid and make full use of renewable energy. It represents the future development direction of DC transmission and has become one of the key technologies of the new generation of smart grid. The stability and economy of the modular multilevel converter, one of the core devices in the flexible power transmission project, are still one of the key points restricting the large-scale commercial operation of the flexible DC transmission technology. The invention patent starts from improving the economy of the modularized multilevel converter, and reduces the number of sub-module voltage sensors on the premise of ensuring the stability of the system, there...

Claims

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Application Information

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IPC IPC(8): H02M7/00H02M7/483H02M7/5387
CPCH02M7/00H02M7/483H02M7/5387H02M7/4835
Inventor 黄守道荣飞陈盼庆罗德荣龚喜长李旺
Owner HUNAN UNIV
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