Remote Power Generating Systems with Using Low Frequency Transmission

The goal of this research is to evaluate alternative transmission systems from remote wind farms to the main grid using low-frequency AC technology. Low frequency means a frequency lower than nominal frequency (60/50Hz). The low-frequency AC network can be connected to the power grid at major substations via cyclo-converters that provide a low-cost interconnection and synchronization with the main grid. Cyclo-converter technology is utilized to minimize costs which result in systems of 20/16.66 Hz (for 60/50Hz systems respectively). Low frequency transmission has the potential to provide an attractive solution in terms of economics and technical merits. The optimal voltage level selection for transmission within the wind farm and up to the interconnection with the power grid is investigated. The proposed system is expected to have costs substantially lower than HVDC and conventional HVAC systems. The cost savings will come from the fact that cyclo-converters are used which are much lower in cost than HVDC. Other savings can come from optimizing the topology of the wind farms. Another advantage of the proposed topologies is that existing transformers designed for 60 Hz.