Control of a Multi-terminal VSC-HVDC System for Wind Power Delivery

Among the most developed renewable energy sources, wind energy attracts the most research attentions. Wind energy is easily captured far away from the places where wind energy is used. Because of this unique characteristic of the wind, the generation and delivery systems of the wind energy need to be well controlled. This paper presents how to model and control the Multi-Terminal DC [MTDC] networks used in wind applications. The paper also provides two different control techniques, the PID controller and the Fuzzy Logic controller algorithms to ensure best power management between the wind farm side [WFS] and the grid side [GS] and to compare between the dynamic responses of the two controllers in the WFS. In the WFS, the Doubly Fed Induction Generator [DFIG] was applied as it can be directly linked to the grid and can reduce the scale of power electronics used to 30%[3] of the rated capacity hence the cost is reduced. The MTDC network with four terminals is fully simulated and tested using MATLAB/SIMULINK software.