Patent ID: 7432686

Claim:
A fluid-flow turbine with low voltage ride-through capability comprising: a rotor having at least one blade, an output of said rotor being rotational power; a generator connected to said output of said rotor, an output of said generator being electrical power; an inverter connected to said output of said generator, at least a portion of said electrical power output being conditioned by said inverter resulting in an inverter output voltage and current at a frequency and phase angle appropriate for transmission to a multi-phase utility grid; a frequency and phase angle sensor connected to said utility grid operative during a fault on said grid for detecting the frequency and phase angle of at least one phase of said multi-phase utility grid; and, a control system having a control system input connected to said sensor and a control system output connected to said inverter; said control system controlling said inverter to synthesize current waveform templates for phases of said electrical circuit based on said detected frequency and phase angle of said one phase, thereby providing current to said grid at a frequency and phase angle that are based on said detected frequency and phase angle to thereby utilize said current waveform templates to deliver electrical current to said phases of said utility grid during said fault condition; said control system output being a current command signal enabling said inverter to put out a current waveform which is of the same phase and frequency as detected by said sensor.