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This paper presents a method to determine the weakest bus in a distribution network. The voltage stability indicator (VSI) identifies the weakest bus of system. The voltage stability indicator is derived from the voltage equation of radial distribution system. The weakest bus voltage profile is improved by placing a DSTATCOM. The DSTATCOM is modeled to supply the required reactive power for compensation and to maintain the voltage magnitude of the node where DSTATCOM is placed as 1 p.u. The validity of the proposed VSI and DSTATCOM modeling is examined by a standard 33 bus radial distribution system. The results validate the proposed VSI and DSTATCOM models in large distribution systems.

Identification of weak buses using Voltage Stability Indicator and its voltage profile improvement by using DSTATCOM in radial distribution systems