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This paper presents the control strategy of a dc series offshore wind farm with an onshore modular multilevel converter (MMC). The series connection of the dc wind turbines establishes the HVDC transmission voltage level with neither offshore transformer nor centralized converter station, indicating huge savings on offshore wind farm investment. However, power production unbalance in the wind farm...
This study presents control strategies of offshore wind farms with dc series collector systems and modular multi-level converter based high voltage direct current (MMC-HVDC) transmissions. Series connection of dc wind turbines enables the collector system to establish the HVDC transmission voltage level with neither transformer nor centralized converter platform, indicating huge savings on offshore...
The rapid development of economic is inseparable from the support of resources, while the huge consumption quantities of resources will inevitably lead the negative impact to the environment of mine, such as the poor environment for production of the mine, discharging the “three kinds of wastes”, geological disasters, and the destruction of environmental resources, etc. How minimize the extent of...
The dynamic matching mechanism between different niche strategy and technological capability is explored from the evolving perspective from the case of CHINT Group, which is a firm in China. The niche strategy can be categorized two kinds of product niche and process niche according to the different competitive position. The technological capability can be divided into duplicative imitation, creative...
In order to capture the inner-surface cloud of pipe figure components with different material rapidly and efficiently, a new cloud capturing system based on computer vision for inner-surface of pipe figure components was designed. Firstly, the IIRDL (Integrated Inner-reflection Ringy Discrete Laser-spot) method was proposed, which combined the merits of the LSS (Laser Single-spot Scanning) method,...
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