Optimal placement and Sizing of Compensator for Voltage Stability improvement Using Voltage Collapse Proximity Indicator

摘要

Voltage stability is considered to be the most important problem that the modern power system experiences, arises mainly due to the dominated lagging loads of the system. Analysis of voltage stability problem in the stressed network with efficient techniques can improve the reliability of the system. It became important for the electric utilities to monitor the system stability for secure and reliable operation of the interconnected system. An efficient method for voltage stability and contingency monitoring is described. Proposed method analyzes the entire system and calculates the VCPI Indices of each line in the system. This index varies in the range of 0 to 1. This technique is implemented on 5 Bus system and 6 Bus system and its credibility was desired in analyzing the stressful condition of the system. Depending upon the VCPI indices buses were ranked according to their vulnerability to voltage collapse and find the optimal location for the placement of shunt compensator. After finding the location optimal size of the compensator need to be found at the location by PV method, where Load bus is converted to PV bus and Reactive power needed will be considered as optimal size of shunt compensator. Size of the shunt compensator required is the reactive power injected at the vulnerable bus.