Coordination control technical design scheme for improving complex fault ride-through capability of offshore wind power flexible multi-terminal collection system

Abstract

The invention provides a coordination control technical design scheme for improving the complex fault ride-through capability of an offshore wind power flexible multi-terminal collection system. The scheme comprises the following steps: 1) a steady-state simulation verification control strategy: determining a basic control strategy mentioned in the invention, thereby enabling a multi-terminal network to operate normally and safely in a steady state; 2) verifying the feasibility of the scheme by implementing faults on the master station power grid, the slave station power grid and the wind power plant, and enabling the system to operate stably when a single fault is verified; and 3) implementing complex multiple faults to verify and analyze the comprehensive complex fault ride-through coordination control strategy, and simultaneously implementing faults on the master station power grid, the slave station power grid and the wind power plant to form a complex fault environment. When the DC bus voltage drops, the system is switched to a complex fault ride-through coordination control strategy under master-slave scheduling control, and redundant power is discharged through switching operation of the hybrid DC ETO control unloading circuit, so that the purpose of stabilizing and balancing the DC bus voltage is achieved.

Description

Technical field[0001]The technical field of the present invention is the field of design of multi-selection system, including multi-end flexible DC collection systems, model establishment and control technology design, and coordinated control technology design for system in complex multi-failure .Background technique[0002]In the context of global energy cleaning, sea wind power has the advantage of stable resource conditions, close to electricity load center, and has become an important direction for wind power in all countries in the world. According to relevant research, the global sea wind power is mainly concentrated in China and Europe. Based on the World Climate Change Report, by 2050, 80% of the world's energy supply came from renewable energy, with wind power to play an extremely important role. With the rapid development of sea wind power, especially the urgent needs of building large sea wind power bases, the delivery of large-scale sea wind power is an urgent need to stud...

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Problems solved by technology

[0003] At present, the research on fault ride-through of wind power flexible multi-terminal DC transmission system is mainly aimed at the case of a single fault in the system, and does not take into account the ride-through capability of offshore wind power multi-terminal flexible DC system under multiple faults; domain, and according to the design principle of the energy dissipation resistor, the switching control strategy suitable for different wind power operating conditions is given, but the control strategy of the multi-terminal system is not considered; Design of crossing control strategy, but not combined with offshore wind power multi-terminal system

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