Design of a continuously and linearly controlled VSI-based STATCOM for load current balancing purposes

In this paper, load current balancing are reviewed in both three-wire and 4-wire systems taking into account linearity, harmonics injection, control schemes. A linearized static compensator (STATCOM) based on H-bridge voltage source inverter (VSI). The proposed STATCOM is controlled closed loop mode via equipping it with a new controller. DC capacitor of the kept constant without using external energy injection or storage devices shunting suitable series filter. simulation results responses 220V, 50Hz reveal continuous linear performance during responding to reactive demands from 123A inductive 227A capacitive current. transition time required for treatment sudden change demand maximum less than 40ms. steady state portions show pure sinusoids, thus can be promoted as harmonic free Var compensator. considerable linearity promot bipolar susceptance (capacitive inductive) applications three four wire power systems.