Abstract: A method of operation of a turbogenerator system is described. The system comprises a plurality of turbogenerators provided in parallel and in fluid communication with a gas stream. The method comprises identifying one or more of the turbogenerators which are currently operating closest to their maximum power output, and adjusting the speed of one or more of the turbogenerators to cause the power outputs of the plurality of turbogenerators to become more similar. In this way, it is possible to match the power output of the plurality of turbogenerators.

Abstract: A method of operation of a turbogenerator system is described. The system comprises a plurality of turbogenerators provided in parallel and in fluid communication with a gas stream. The method comprises identifying one or more of the turbogenerators which are currently operating closest to their maximum power output, and adjusting the speed of one or more of the turbogenerators to cause the power outputs of the plurality of turbogenerators to become more similar. In this way, it is possible to match the power output of the plurality of turbogenerators.

Abstract: An active damping arrangement for a power conditioning circuit comprising a converter or an inverter and an electronically driven output line having an output terminal for connecting to an external load, the active damping arrangement comprising an inductor-capacitor low-pass output filter (OPF) for connecting between an output of the inverter/converter (PWMVC or BBHCC) and the output terminal; means for sensing current in or voltage across the capacitor or voltage between one end of the capacitor (C) and an effective neutral point; means for multiplying the sensed voltage or current by a coefficient G to provide a damping signal, and means for feeding back the damping signal to an input of the inverter/converter (PWMVC or BBHCC), thereby to damp the output of the inverter/converter.

Abstract: An apparatus for the improvement of AC waveform comprising means for applying a demand input waveform at an input of a circuit for power conditioning (including an inverter PWMVC or BBHCC) that is operable to provide an output waveform at an output; a feedback loop between the input and output, the feedback loop including means for sampling the output waveform (ADC1), means for subtracting a required waveform (RW) from the output waveform to produce an error waveform, means for processing the error waveform in a pre-defined manner to produce a processed error waveform (Clip1, Disc1, Att1), means for adding or subtracting the processed error waveform from Th. demand waveform to produce a revised demand waveform, and means for applying the revised demand waveform to the input of the power conditioning circuit at a subsequent time as an input demand waveform to produce a new AC output waveform at the output.