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Modular multilevel converter high voltage direct current (MMC-HVDC) converter station starting method used for power network black start

An MMC-HVDC, converter station technology, applied in the field of MMC-HVDC converter station start-up, can solve the problems of complex dynamic process of capacitor charging and other problems

Inactive Publication Date: 2013-03-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

The capacitors of MMC are dispersed in each sub-module, and the dynamic process of capacitor charging is more complex compared with the two-level topology

Method used

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  • Modular multilevel converter high voltage direct current (MMC-HVDC) converter station starting method used for power network black start
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  • Modular multilevel converter high voltage direct current (MMC-HVDC) converter station starting method used for power network black start

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Embodiment Construction

[0027] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0028] figure 1 is the topology of the modular multilevel converter MMC. figure 1 Among them, A, B, C, represent the three phases of the AC side of the MMC converter; SM1, SM2, ..., SMn, represent the first sub-module, the second sub-module, ..., the nth sub-module in a certain bridge arm of the MMC; L represents the bridge arm reactor; Udc represents the voltage difference between the positive and negative DC bus bars of the MMC.

[0029] figure 2 It is the sub-module topology of the half-bridge structure MMC. figure 2 middle, T 1 ,T 2 , respectively represent the upper and lower IGBTs in the half-bridge sub-module, D 1 ,D 2 respectively represent the anti-parallel diodes of the corresponding IGBT; C 0 Repr...

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Abstract

The invention discloses a modular multilevel converter high voltage direct current (MMC-HVDC) converter station starting method used for a power network black start and belongs to the technical field of power transmission and distribution. The technical scheme is that corresponding starting method and strategy are provided aiming at a two-end system and a multi-end system, wherein the method and strategy for the two-end system converter station black start comprise the steps of firstly, starting an active side converter station, closing a direct current transmission line disconnecting link, and charging a passive side converter station at the same time, secondly, carrying out charging in an alternation cycle sorting conversion mode, locking the converter station for a short time when pre-charging is finished, and finally, unlocking the converter station, placing a constant alternating-current voltage controller and fishing start-up. The method and strategy for the multi-end system converter station black start comprise the steps of respectively connecting a resistance (Rx) with positive and negative electrodes on the outlet side of each end of the multi-end system in series on the basis of the steps of the start-up of the two-end system and guaranteeing that the black start can be carried out at any ends with other ends keeping in stable operations. Therefore, reliability of power supply is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a method for starting an MMC-HVDC converter station used for a black start of a power grid. Background technique [0002] Modular Multilevel Converter (MMC) is a new voltage source converter topology proposed by R. Marquardt and A. Lesnicar in 2002. The output waveform has the advantages of low harmonic content. Therefore, the MMC-based high-voltage direct current transmission system (MMC-HVDC) has also become a research hotspot in the field of direct current transmission. In recent years, the research on using VSC-HVDC as the black start power supply to realize the black start of the power grid has received widespread attention, and has been applied in the Troll A drilling platform and the Eagle Pass project in the United States. Application literature is rare. When MMC-HVDC is used for grid black-start, the primary issue to be studied ...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02M1/36
Inventor 赵成勇李探王朝亮郭春义
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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