Voltage source converter-high-voltage direct current (VSC-HVDC) is the mainstream technology of the offshore wind power\ntransmission, which has been rapidly developed in recent years. The small-signal stability problem is closely related to offshore wind\npower grid-connected safety, but the present study is relatively small. This paper established a mathematical model of the doubly fed\ninduction generator (DFIG) integrated into the IEEE9 system via VSC-HVDC in detail, and small-signal stability analysis of offshore\nwind farm (OWF) grid connection is specially studied under different positions and capacities. By selecting two load nodes and two\ngenerator nodes in the system for experiments, the optimal location and capacity of offshore wind power connection are obtained by\ncomparing the four schemes. In order to improve the weak damping of the power system, this paper presents a method to determine the\nparameters of the power system stabilizer (PSS) based on the particle swarm optimization (PSO) algorithm combined with different\ninertia weight functions. The optimal position of the controller connected to the grid is obtained from the analysis of modal control\ntheory. The results show that, after joining the PSS control, the system damping ratio significantly increases. Finally, the proposed\nmeasures are verified by MATLAB/Simulink simulation. The results show that the system oscillation can be significantly reduced by\nadding PSS, and the small-signal stability of offshore wind power grid connection can be improved.
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