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An Optimal Configuration Method for Modular Multilevel Flexible DC System

A modular multi-level, flexible DC technology, applied in DC network circuit devices, circuit devices, conversion equipment that can be converted to DC without intermediate conversion, etc. Achieve the effects of AC and DC fault ride-through, filtering out harmonics, and compensating for capacitance loss

Active Publication Date: 2015-08-05
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the structure of the above-mentioned structure 2, its evolved topology is difficult to achieve DC fault ride-through

Method used

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  • An Optimal Configuration Method for Modular Multilevel Flexible DC System
  • An Optimal Configuration Method for Modular Multilevel Flexible DC System
  • An Optimal Configuration Method for Modular Multilevel Flexible DC System

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Embodiment Construction

[0046] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0047] A method for optimizing the configuration of a modularized multi-level flexible DC system provided in this embodiment, the flow chart of which is shown in Figure 10 As shown, it specifically includes the following steps:

[0048] (1) Configure the converter with bipolar topology, and its structure diagram is as follows Image 6 shown;

[0049] The inverter configured with a bipolar topology is connected to the same ground point through the negative poles and positive poles of the two serial topology inverters, and the other positive poles and negative poles are connected to the transmission line to form a bipolar topology inverter. streamer, or

[0050] The negative poles and positive poles of the two parallel topology converters are connected to the same ground point, and the other positive poles and negative...

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Abstract

The invention provides an optimal configuration method of a modular multi-level flexible direct current system. The method comprises the following steps of (1) configuring a converter in a double-pole topological structure, (2) configuring a capacitance energy balance current access according to the converter in the double-pole topological structure, and (3) computing an output voltage set value of a sub-module. Through the access, the sub-module is controlled according to the output voltage set value, and capacitance energy balance can be achieved. According to the optimal configuration method of the modular multi-level flexible direct current system, using number of elements is small, cost is low, a high-voltage high-capacity overhead line transmission structure is easy to realize, and a balance strategy can effectively achieve capacitance energy balance.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission, and in particular relates to an optimal configuration method of a modularized multilevel flexible direct current system. Background technique [0002] The flexible direct current transmission system is a direct current transmission system based on a voltage source converter with a fully controlled device (IGBT) as the core. It has superior performance and good application scalability. And many other fields have broad application prospects. In recent years, modular multi-level flexible DC transmission technology has developed extremely rapidly. [0003] The converter of the flexible DC transmission system is its core component, which is used to realize the conversion of AC and DC electrical quantities. The development of the high-voltage flexible DC converter has gradually changed from the original two-level topology and three-level topology to the current module The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/00H02M5/10
CPCH02M2007/4835H02M7/4835H02M1/0095
Inventor 杨杰贺之渊林畅孔明阎发友何维国刘隽
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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