Voltage stability margin regarding with contingency ranking in radial distribution system using novel method is proposed in this paper. Two new indices are derived to forecast the voltage stability in the radial distribution feeders. Here, RSI_N(r) is the radial stability index calculated for each bus and utilized for forecasting the voltage stability. The second index is derived by finding the effect of receiving end voltage change on voltage stability index at a specific bus. Contingency planning by delta analysis method improves the reliability of the system. The proposed system is employed for optimally ranking the contingencies. Impact on voltage stability due to contingencies like loss of FACTS devices, loss of distributed generation (DG) sets and loss of lines is carried out on radial distribution feeders and compared the experimental results with the proposed method using MATLAB platform. The proposed indices are implemented on the test systems and outcomes are compared to existing indices on literature and it is viewed that the proposed indices are effective on predicting the system stability. Contingency due to a loss of DG set, due to a loss of reactive source, due to a loss of line, due to loss of DG set are the considered test cases. Voltage profile improvement using Static VAR Compensator (SVC)-DSTATCOM is also employed in this paper. The proposed system is also tested under 15, 28 bus system, IEEE-69 and 123 bus system.

Distribution systems (DSs) are highly stressed with addition of newer loads like electric vehicle charging stations and lower scope for expansion due to urbanization. Any line outage could cause interruption to major loads. Reliability studies have gained importance for lowering the frequency and lowering the duration of interruption for supply systems. In this paper a bistage method for optimum placement of reactive power compensation devices and distributed generations (DGs) for enhancing voltage stability and system reliability. A new method named delta analysis method is used to optimally locate the reactive power compensation devices and DGs. IEEE-33 radial DS, which is taken as experimental system. Based on the study, the fixing of reactive power compensation devices and DGs are to increase voltage outline of buses and decrease power fatalities. After the placement of DGs, the enhancement in reliability indices following line contingency is studied using MATLAB simulation.

Current scenario is modern existence and distribution system that is loaded heavily. Also, it altered a lot due to marvelous surge on distribution system load, surge in renewable supply group, accumulation of solar power systems by residential, manufacturing patrons and production of bulky rechargeable stations. Study on voltage stability distinguished based on distribution system is increasing demand. At some extent, an unintentional line outage puts the system security and reliability in kept under hazard. In this manuscript, the main focus is working on contingency analysis in standard 15 bus system Radial Distribution System. An algorithm shows that forecast the setting and quantity of capacity reduce the development of voltage stability in distribution system. Then, the proposed method is executed on a standard 15 bus system Radial Distribution System and effects indicates that voltage stability of the system enhanced along execution of above method uses DSTATCOM and it is implemented in MATLAB.

Distribution systems (DSs) are highly stressed with addition of newer loads like electric vehicle charging stations and lower scope for expansion due to urbanization. Any line outage could cause interruption to major loads. Reliability studies have gained importance for lowering the frequency and lowering the duration of interruption for supply systems. In this paper a bi-stage method for optimum placement of reactive power compensation devices and distributed generations (DGs) for enhancing voltage stability and system reliability. A new method named delta analysis method is used to optimally locate the reactive power compensation devices and DGs. IEEE-33 radial DS, which is taken as experimental system. Based on the study, the fixing of reactive power compensation devices and DGs are to increase voltage outline of buses and decrease power fatalities. After the placement of DGs, the enhancement in reliability indices following line contingency is studied using MATLAB simulation.