Active power line conditioner with synchronous...

H - Electricity – 02 – M

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H02M 1/12 (2006.01) G05F 1/70 (2006.01) H02J 3/01 (2006.01) H02J 3/18 (2006.01)

Patent

CA 2147257

An improved active power line conditioner is disclosed. The active power line conditioner includes a series inverter (52) coupled to an energy input source, and a parallel inverter (54) coupled to a non-linear load (56). The non-linear load (56) is pow- ered by a three phase load current which includes fundamental components and harmonic components. An energy storage ele- ment (58) is electrically connected between the series inverter (52) and the parallel inverter (54). The series inverter (52) is con- trolled by a series filter controller (68) which performs synchronous transformations on the load current to generate a series filter feedforward signal corresponding to the fundamental components of the load current. The series filter feedforward signal is ap- plied to the series inverter (52) to generate sinusoidal input currents for the non-linear load (56). The parallel inverter (54) is con- trolled by a parallel filter controller (64) which performs synchronous transformations on the load current or series inverter input voltages to generage a parallel filter signal corresponding to the harmonic ripple components of the load current. The parallel fil- ter signal is applied to the parallel inverter (54) to generate sinusoidal voltages for the non-linear load (56).

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