Point-To-Point Low-Frequency AC Transmission of Offshore Wind Power Using Voltage Source-Based AC/AC Converter

This paper approaches an alternative way of transmitting wind power at low-frequency AC (LFAC) mode from the offshore grid to the onshore grid. At the onshore station, a voltage source converter (VSC)-based AC/AC converter is implemented in this study. Replacing the cyclo-converter and connecting wind power to a weak grid or even to a passive network. Whereas the cyclo-converter has a limitation of connecting to the only stiff grid. This approach gives the competitive options for VSC high voltage DC (HVDC) with regards to the multi-terminal HVDC network problem as the transmission distance and power transfer improves by using LFAC (1/3 of nominal frequency) approach. It also facilitates to independently controls the AC voltage and active power requirement. The requirement of filter will also be decreased which is normally more in line commutated converter (LCC) -based cyclo-converter. So, the wind power with LFAC can be interfaced with any type of AC network by using VSC-based AC/AC converter.