Dynamic simulation system of offshore wind power transmission and grid connection system via vsc‑mtdc

Abstract

The invention discloses a dynamic simulation system of an offshore wind power power-transmission and grid-connected system through a VSC-MTDC. A main circuit frame of a grid-connected system is given, a design scheme of a monitoring system is improved, a monitoring system framework based on a central monitoring system and convertor station monitoring system double-layer structure is provided, an interface scheme of a fan simulation device monitoring system and a convertor station monitoring system is given, and a coordination control method between VSC-MTDC power transmission system network side converter stations is designed. The dynamic simulation system is advantageous in that a reliable and convenient research platform is provided for a system scheme of the offshore wind power power-transmission and grid-connected system through the VSC-MTDC, control system design, control strategy research and dynamic response characteristic analyses, and a good test environment is provided for system engineering development and debugging.

Description

technical field [0001] The invention relates to a dynamic simulation system of a grid-connected system for offshore wind power transmission via VSC-MTDC (multi-terminal flexible direct current). Background technique [0002] Under the multiple pressures of tight supply of fossil energy and increasing environmental pollution, wind energy and other renewable energy power generation has developed rapidly, especially the development of large-scale offshore wind farms has become a major trend in the use of wind energy in the world. [0003] However, because offshore wind farms are far away from the coast, and most of the power grids on the seaside are at the end of the grid, the seaside power grid is relatively weak. Therefore, the integration of offshore wind power has a great impact on the stability and power quality of the connected power grid. At the same time, the long-distance power supply of these offshore wind farms cannot be realized because the AC cables are limited by ...

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Problems solved by technology

[0004] 1. The 201110308466.4 Chinese patent only provides the dynamic model device of the offshore wind power through two-terminal flexible DC transmission system, and does not propose the design scheme of the dynamic model device of the multi-terminal flexible DC transmission grid-connected system, and does not involve the multi-terminal flexible DC transmission grid-connected system. DC voltage control and optimal control

[0005] 2. The 201220206525.7 Chinese patent only provides a design scheme for the main circuit of a large-capacity converter composed of a phase-shifting transformer and cascade connection of multiple power unit DC side output terminals, which is the main circuit of a two-terminal flexible DC transmission system. Circuit design, does not involve the design of the main circuit and control system of the multi-terminal flexible direct current transmission system

[0006] 3. The 200810038541.8 Chinese patent only provides the control strategy of offshore wind power through the two-terminal flexible direct current transmission system converter station, does not involve the application of real-time communication in the control process, and does not involve the control system design of the multi-terminal flexible direct current transmission system

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