Voltage Stability Enhancement by Reactive Power Changes based on Voltage Stability Index PTSI

Abstract:
Voltage stability and preventing voltage collapse is becoming a major concern of grid operators based on flexible loads and volatile generation. In voltage stability analysis, stability margins of systems can be estimated by calculating voltage stability indexes. One well-known stability index is the power transfer stability index PTSI that determines maximal load at buses. Based on PTSI, this paper presents a novel approach for voltage stability improvement by calculating optimal reactive power measures using a sensitivity merit order list. In case studies, the effectiveness and functionality of this improved approach is shown on the IEEE 39-bus test system. To enhance voltage stability, this algorithm can be used to calculate optimal amount and location of reactive power changes as well as optimal location and sizing of additional reactive compensation systems. The proposed method is therefore a great tool to improve voltage stability in a targeted manner.