Investment evaluation model considering redundancy for flexible direct current converter

An evaluation model, flexible DC technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, power transmission AC network, etc., can solve problems such as low switching frequency and reduced system operation reliability

Inactive Publication Date: 2018-06-12
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
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Problems solved by technology

Low switching frequency, easy to expand the system and many other advantages, but the MMC is composed of multiple sub-modules cascaded, the output function largely depends on the sub-modules, once a sub-module fails, it will affect the normal operation of the MMC, thereby reducing t

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  • Investment evaluation model considering redundancy for flexible direct current converter
  • Investment evaluation model considering redundancy for flexible direct current converter
  • Investment evaluation model considering redundancy for flexible direct current converter

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Embodiment Construction

[0016] The detailed content of the present invention and its specific implementation will be further described below in conjunction with the accompanying drawings.

[0017] see Figure 1 to Figure 5 As shown, in the investment evaluation model of the flexible DC converter considering redundancy in the present invention, the stable operation of the MMC is related to the reliability and stability of the MMC-HVDC system, and the redundant sub-module is an important means of MMC fault protection, which can Prevent the MMC from affecting other normal submodules or system functions due to a submodule failure. As the voltage level increases, the number of power modules will increase significantly. Under long-term operation, power module failures are inevitable. In order to avoid affecting the normal operation of the system, redundant modules need to be configured. When the working module fails, first bypass it, and then replace the failed module with a redundant module to ensure saf...

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Abstract

The invention relates to an investment evaluation model considering redundancy for a flexible direct current converter, and belongs to the field of flexible direct current transmission. No special redundant sub-modules are set, all the sub-modules take turns to work, and the sub-modules which are not involved in the work are the redundant sub-modules for this round; in a working cycle, appropriaten sub-modules are selected from 2 (n+m) sub-modules of one phase to be put into work, and all the remaining redundant sub-modules are also involved in sub-module sorting and switching operation at all times; after a fault occurs, the redundant sub-module is put into work through a bypass fault sub-module to replace the faulty sub-module, and at most m sub-modules can be allowed to fail. It can beensured that an MMC is always in symmetrical operation. Compared with other schemes which have asymmetrical operation situations, the investment evaluation model has the advantages that the generatedharmonic circulating current is small. Compared with other schemes which have the problem that redundant sub-modules need to be charged before being put into use, the investment evaluation model hasthe advantages that the charging time is effectively shortened, and the input sub-modules are determined only through a selection strategy to complete the input action.

Description

technical field [0001] The invention relates to the field of flexible direct current transmission, in particular to an investment evaluation model of a flexible direct current converter considering redundancy. Background technique [0002] Since the emergence of the high voltage direct current (HVDC) technology based on the voltage source converter (Voltage source converter, VSC), the commutation components of the direct current transmission have been constantly innovating. Early HVDC adopts two-level or three-level converter technology, and a large number of IGBTs are directly connected in series to form valves. Although the circuit structure is simple, the technology is very difficult and the loss is high. Modular multilevel converter (MMC) is a new type of voltage source converter with a highly modular structure, easy to expand the system and realize redundant control, low switching frequency, and good output voltage waveform , has been widely used in flexible direct cur...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M1/32H02J3/36
CPCH02J3/36H02M1/32H02M7/483H02M1/325Y02E60/60
Inventor 涂莉许韦华阳岳希江伟黄道姗杜镇宇张慧瑜张迪辛业春
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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