Power Coordination Control Strategy of VSC-MTDC System for Large-scale Wind Power Grid Connection
The voltage source converter-based multi-terminal DC power transmission system(VSC-MTDC)has become the primary choice for achieving long-distance power transmission and grid connec-tion of large capacity wind power.This paper mainly focuses on the improved power coordination control strategy of VSC-MTDC systems with large-scale wind farms.Firstly,this paper analyzes the influence of sag coefficient on active power distribution when large-scale wind power is connected to the grid,and points out that the fixed droop coefficient has drawbacks such as the possibility of priority grid power shortage and lack of flexibility in allocating active power.To address these issues,this paper proposes a co-ordinated control strategy based on the combination of master-slave control and adaptive droop control,which formulates three control modes according to the wind power situation,so as to realize the flexible distribution of wind power.Finally,a four-terminal flexible DC transmission system for wind power con-nected to the grid is built on MATLAB/Simulink,and the simulation results verify the feasibility and effec-tiveness of the proposed control strategy.
VSC-MTDCactive power allocationcoordination control strategyadaptive droop controlwind power grid connection
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