Voltage stability improvement in power system using optimal power flow with constraints

In planning and security evaluation of power systems voltage stability correction or an improvement is a worthwhile issue. In current scenario the power utilization of the customers have been incremented drastically because of this nowadays the power system are running at massively strained out situation with decreased stability margins, the voltage stability improvement have a great attention in power system. Here this research developed a Voltage Stability Constraint - Optimal Power Flow (VSC-OPF) algorithm to improve the voltage stability and reduction in losses of system. Also the proximity value of all transmission lines and load buses are calculated using the VCPI indicator. The VCPI index is combined with the OPF formulation is in given two ways; (a) in OPF constraint it can be added as a new voltage stability constraint, or (b) used as the objective function of voltage stability. The standard IEEE 30 bus system has been used to evaluate the projected method. The obtained results from simulation are able to explain the efficacy of the Voltage Stability Constrained-Optimal Power Flow based on the line voltage stability index. The results are verified through coding using MATLAB SOFTWARE.