Compact power converter with high waveform quality for direct-drive renewable energy generators

Offshore wind turbines are being deployed with increasing power ratings to take advantage of the reduced cost of electricity achievable with larger machine sizes. The power conditioning system and transformer that interface the wind generator to the grid are a critical part and there is an industry need to make them more compact, reliable, easier to install and service, and capable of cleaner waveforms. The objective of the proposed work is to develop a compact power conditioner using wideband gap semiconductors and high frequency transformers for interfacing offshore wind machines such newly developing superconducting generators with high voltage 69 kV collection grids. A multilevel scalable power conditioner topology with novel high frequency and high voltage isolation will be developed. Computer models of the converter interface with a superconducting generator and a medium voltage grid were developed. Prototype testing of the new high frequency transformer insulation concept was carried out. Work to be done includes computer modeling and simulation of the converter system and controls along with generator and grid interface. A prototype 35 kV system will be built using the modular high frequency link converter concept. Commercialization tasks will be undertaken. Benefits of the new power conditioning system include reduced size and weight which will make it easier to install and service in offshore turbines. The technology can also be used for other applications such as solar farm integration, locomotives, and offshore oil and gas installations.