Performance Assessment of Power System by Incorporating Distributed Generation and Static VAR Compensator

Due to the continuous increment of the load demand, identification of weaker buses, improvement of voltage profile and power losses in the context of the voltage stability problems has become one of the major concerns for the larger, complex, interconnected power systems. If the voltage profile of the weaker buses is improved, the voltage stability can be improved significantly. Because of the increasing importance of the stability, it is essential to analyze and improve the voltage profile, power losses in the context of steady state stability considering weak buses of the network. Static VAR Compensators (SVC) and Distributed Generators (DGs) can be installed at the identified weaker buses to improve voltage stability and power loss. This paper focuses on identification of weakest bus/area of the system by analyzing several voltage stability indices. The multi-objective PSO is used to find the optimal location and size of DG and SVC. The impact of the distributed generation (DG) unit installation on electric power losses, voltage profile and steady state voltage stability is thoroughly analyzed. The performance is also assessed by connecting static VAR compensator (SVC). Remarkable improvement in the system performance is observed by integrating SVC and DG in the test systems like IEEE 30 interconnected and 12 bus radial systems. By showing results, the performances of DG, SVC and their combined incorporation in the same test systems are analyzed and compared. Keywords—Distributed Generation; Static VAR Compensator; weaker buses; power loss; voltage stability