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Average value model of MMC

A technology for modular multi-level, average value models, applied in the field of power transmission and distribution

Active Publication Date: 2014-07-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
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Problems solved by technology

[0006] Aiming at the deficiency of the average value model of the existing modular multilevel converter mentioned in the above background technology, the present invention proposes an improved average value model of the modular multilevel converter

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Embodiment Construction

[0015] The average value model of a modular multilevel converter involved in the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0016] The technical problem to be solved by the present invention is to improve the topology of the MMC average value model to make up for the inability of the existing average value model to accurately simulate the functions of DC faults and converter blocking of the MMC system, so that it has corresponding functions and is more suitable for multi-terminal DC power supply. Web simulation. The present invention adopts following technical scheme to realize:

[0017] The present invention realizes by carrying out following three-step improvement to existing mean value model:

[0018] Step 1: In figure 1 The DC side equivalent capacitance of the average model in C AVM Connect a diode D3 in parall...

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Abstract

The invention relates to an average value model of an MMC and belongs to the technical field of power transmission and distribution. Through an average value model of a prior MMC, direct-current faults of an MMC system and converter blocking can not be precisely simulated. According to the core technical scheme of the improved average value model, firstly, a diode is connected to an equivalent capacitor of the direct-current side of the average value model in parallel so that the capacitor voltage of the equivalent capacitor can be a nonnegative number all the time under serious double-pole direct-current short circuit fault conditions; then, the alternating-current side of the average value model is connected with the direct-current side of the average value model through a cascading switch very large in turn-off resistance, and it can be simulated that alternating-current side voltage bias can be accurately generated when single-pole direct-current grounding faults happen; finally, a fly-wheel diode is connected to an alternating-current side bridge of the average value model in series through a cascading bypass switch, and a reverse fly-wheel diode is connected with an equivalent capacitor branch circuit of the direct-current side in series through a bypass switch so that the average value model can have functions like simulating converter blocking or starting and locking after direct-current faults.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to an average value model of a modular multilevel converter. Background technique [0002] In recent years, high-voltage and high-power fully-controlled power electronic devices such as IGBTs and IGCTs have been widely used in long-distance power transmission systems and low-voltage power distribution networks, especially in high-voltage direct current transmission based on voltage source converters (VSC- HVDC) technology. Compared with the traditional two-level and three-level VSC-HVDC, the modular multilevel converter (MMC) topology proposed by Siemens has the advantages of not requiring a large number of IGBTs to be directly connected in series, the device withstands a low voltage and current change rate, and does not require a filter Etc. At the same time, at the same voltage level, it requires twice as many switching devices, and the co...

Claims

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Application Information

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IPC IPC(8): H02M7/797
Inventor 许建中赵成勇郭春义
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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