A simplified control strategy for Shunt Active Power Line Conditioner working under unbalanced non-sinusoidal supply conditions

Abstract

In this paper generalized definition of instantaneous power quantity in the multiphase system under balanced sinusoidal, unbalanced sinusoidal and unbalanced non-sinusoidal supply condition is discussed. In the area of Active Power Line Conditioners (APLC), shunt APLC is widely used in practice. Many reference current generation methods are proposed by different researchers, but most of them work optimally with balanced and sinusoidal source voltage. This paper proposes a novel concept of decomposing the multiphase current vector into different components, which represents different components of the power quantity. The components of current corresponding to zero-sequence power, oscillating power and unwanted components of active power are separated using these definitions. The separated components of current vector are directly used to derive reference for shunt APLC. The mathematical formulation of proposed control scheme with its applications to Shunt APLC is presented. The validity of the proposed control scheme is verified by the simulation study.