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AssigneeElectric Power Research Institute, Inc.
InventorsMichael B. Brennen, Steven A. Moran, Scott K. Suko
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An improved active power line conditioner is disclosed. The active power line conditioner includes a series inverter coupled to an energy input source, and a parallel inverter coupled to a non-linear load. The non-linear load is powered by a load current which includes fundamental components and harmonic components. An energy storage element is electrically connected between the series inverter and the parallel inverter. The parallel inverter is used for current control functions, while the series inverter is used for instantaneous output voltage regulation. In one embodiment of the invention, a parallel current limiter is used for the parallel inverter. The parallel current limiter is fixed to satisfy specified output voltage total harmonic distortion requirements or peak to rms output current ratios in the active power line conditioner. A series current limiter may be used for the series inverter. The series current limiter is set slightly above the peak of the active power line conditioner input current fundamental. This allows the onset of a small intentional peak output voltage distortion that in turn limits excessive nonlinear load peak currents without back feeding of current harmonics into the input supply of the active power line conditioner.
A method of operating an active power line conditioner which includes a series inverter coupled to a parallel inverter through an energy storage link, said method comprising the steps of:
An active power line conditioner comprising:
An active power line conditioner comprising:
Dependencies are inferred from the claim text.