Experiment on wind power grid integration via fractional frequency transmission system

Fractional frequency transmission system (FFTS) provides a novel approach for the remote wind farm integrated into grid. This approach could overcome the great challenges caused by the randomicity and the intermittence of the wind power. The key equipment of FFTS was cycloconverter. First, an experimental FFTS was proposed. And the power circuit and the control circuit of the 12-pulse cycloconverter were designed. In this experimental system, a synchronizing generator was used to simulate the permanent magnet synchronous generator (PMSG) in wind farm. Furthermore, the operation mode of cycloconverter was discussed. Finally, the open-loop active power regulations method was also introduced. Experiment results show that this system can transmit 20 kW electric power into grid, and verify the realizability of the system which used to integrate wind power into grid via FFTS.