Study of the Dynamic Behavior of a DSTATCOM Installed in a Distribution Network in Case of Single and Multiphase Short Circuit

Abstract

The quality of the electricity delivered to consumers depends in particular on the stability of the distribution system. Any faults that appear on the distribution lines must be automatically controlled and eliminated as quickly as possible. These requirements lead electrical system operators and planners to look for modern equipment adapted to their system. This paper investigated thebehavior of a DSTATCOM in the face of contingencies that may arise in an electrical power distribution network. It shows that DSTATCOM is an effective attenuator to limit the impacts of perturbations on the distribution network. The model equations are simulated in a MATLAB environment and have shown that the exactitude of the network parameters is a determining factor in the capacity of a perturbed distribution network to absorb voltage variations in the presence of a DSTATCOM optimally positioned at a node. The capacitive current of the DSTATCOM increases inversely with a bad power factor and a critical voltage drop. The DSTATCOM in a network is therefore more solicited when the operating parameters of this network degrade as a result of singlephase or multiphase short circuits. Distribution system operators must therefore design protection plans that truly and sustainably limit the impacts of short circuits on distribution systems.