It can be seen that the alternate controller correctly locates the worst violation buses, identifies the most effective control devices with the lowest costs at each step, and finally brings voltage back to normal range. For this system, capacitors are switched in first; then LTC taps are changed or generator voltage set point are adjusted depending on their relative priority. The effects of the relative priority are shown clearly by the different control actions. The switching costs of LTC tap changing and generator voltage adjusting are set equal, thus the generators are chosen before LTCs as controls because the voltage penalties of generator actions are smaller than that of LTC. In contrast, the switching costs of generator voltage adjusting are set significantly higher than that of LTC tap changing, thus the LTCs are chosen to act before generators at each step

alternate controller, normal range, capacitor banks, modified base