Wind power grid-connected control system based on direct-drive modular multilevel converter
A modular multi-level, control system technology, applied in the field of electric power, can solve the problems of inability to meet large-scale, discontinuous output current, inconvenient installation and maintenance, etc., and achieve the effect of improving overall operating efficiency, continuous output current, and convenient maintenance.
Active Publication Date: 2014-10-15
SHANGHAI JIAO TONG UNIV SUBEI RES INST
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Problems solved by technology
[0005] The purpose of the present invention is to provide a wind power generation grid-connected control system based on a direct-drive modular multilevel converter to solve the inconvenience of installation and maintenance and the large output harmonics in the existing wind power grid-connected control system, which requires additional installation Filtering equipment; output current is discontinuous, impacts the power grid and cannot meet the technical problems of large-scale wind turbine development needs
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[0028] The structure and principle of the wind power grid-connected control system based on the direct-drive modular multilevel converter provided by the patent of the present invention will be explained in detail below in conjunction with the accompanying drawings.
[0029] see figure 1 , a wind power grid-connected control system based on a direct-drive modular multilevel converter, comprising: a direct-drive modular multilevel converter 10 , an A / D sampling module 20 and a main control module 30 . One side of the direct-drive modular multilevel converter 10 is connected to the power grid 40, and the other side is connected to the low-frequency transmission line of the wind turbine 50 via a step-up transformer for variable-speed constant-frequency control and power control to achieve safety and reliability Economical grid connection, which includes a 9×n cascaded unit module matrix, and the 9×n cascaded unit module matrix includes 9 bridge arms, each bridge arm is formed by ...
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The invention discloses a wind power generation networking control system based on a direct driving modulation multi-level converter. The system comprises a direct driving modulation multi-level converter, an A / D (Analog-to-Digital) sampling module and a main control module, wherein one side of the direct driving modulation multi-level converter is connected with a power grid; the other side of the direct driving modulation multi-level converter is connected with the low frequency power transmission line of the wind power generation set after the of a wind power generation set is processed by a boost transformer for carrying out variable speed constant frequency control and power control; the system further comprises a 9*n cascading unit module matrix; the A / D sampling module is connected with the direct driving modulation multi-level converter and is used for acquiring electric parameters of the unit modules; and the main control module is respectively connected with the direct driving modulation multi-level converter and the A / D sampling module and is used for providing a switch action signal of each unit module according to the electric parameters of the A / D sampling module. The system has the advantages that the installation and maintenance are convenient, no filtering equipment is needed, the impact on a power grid is small and convenient to expand, and the requirements on the development of a large-scale wind power generation set are met.
Description
technical field [0001] The invention relates to the field of electric power technology, in particular to a wind power grid-connected control system based on a direct-drive modular multilevel converter that does not require additional filter equipment, has little impact on the power grid, and is easy to expand. Background technique [0002] With the development of the global economy, the development and utilization of new energy has been paid more and more attention. Wind energy, as a clean and green renewable energy, its market is also developing rapidly. Therefore, the wind power grid-connected control system has high practical significance. The access technologies widely used in wind power grid-connected systems now mainly include the access of constant-speed and constant-frequency units and the access of variable-speed and constant-frequency units. The outlet frequency of wind turbines is generally between 12 and 18HZ. With the increase of the capacity of wind turbines,...
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IPC IPC(8): H02J3/38
CPCY02E10/763Y02E10/76
Inventor 姜建国高淳徐亚军赵剑飞曹凯杨兴武罗杨兴华
Owner SHANGHAI JIAO TONG UNIV SUBEI RES INST