Patent ID: 7352597
Filing Date: 2008-04-01
Classification: H02J,Y02E

Abstract:
1. A comprehensive power quality controller for a substation in an electric power system, comprising a Thyristor Controlled Reactor (TCR), a pure tuned passive filter (Z f ), an active power filter (APF) and a coupling transformer, wherein the active power filter (APF) is connected with an additional inductor (L a ) in parallel via the coupling transformer, then connected to the passive filter (Z f ) in series to comprise a hybrid power filter system, and the Thyristor Controlled Reactor (TCR) is connected to a power grid in parallel, wherein said additional inductance (L a ) is connected with the active power filter (APF) in parallel, and the active power filter (APF) is a controllable harmonic current source, so as to bypass the reactive current and greatly reduce the power rating of the active filter.