Optimized operation of SVC for minimal harmonics at distribution level

Electrical distribution system suffers from various problems like reactive power burden, unbalanced loading, voltage regulation and harmonic distortion. Though DSTATCOMS are ideal solutions for such systems, they are not popular because of the cost and complexity of control involved. Phase wise balanced reactive power compensations are required for fast changing loads needing dynamic power factor correcting devices leading to terminal voltage stabilization. Static Var Compensators (SVCs) remain ideal choice for such loads in practice due to low cost and simple control strategy. These SVCs, while correcting power factor, inject harmonics into the lines causing serious concerns about quality of the distribution line supplies at PCC. In this paper it is proposed to minimize the harmonics injected into the distribution systems by the operation of TSC-TCR type SVC used in conjunction with fast changing loads at LV distribution level. The harmonics are controlled by the optimistic switching of TCR to minimize Total Harmonic Distortion (THD) at PCC and correcting the power factor at the same time. Fuzzy logic system is used to solve this nonlinear problem, giving ranking of a switching pattern used to trigger switches in TCR. The scheme is attractive and can be used at distribution level where load harmonics are within limits.