Influence of Parallel Capacitor on Variable Electricity Distribution Cost

To clarify the active power supply process formed by the power source and the parallel capacitor and its accompanying economic transportation relation, by use of power component theory and countercurrent tracing method two times of power tracing operation were performed to obtain the power supply networks of each power source and each capacitor, and the power supply relationship between a power source and the capacitor was established. During the economic accounting it was discovered that the classical economic accounting mode of active power from power source to the load might lead to that the active power transmission expense at the capacitor port would be not equal to zero. For this reason, firstly, it was proposed that the economic accounting was performed from the capacitor port to the power source, and using such a economic accounting mode it might ensure that the active power transmission expense at the capacitor port was zero. Secondly, the active power price of load at the node, where the capacitor was connected, was taken as the active power price at capacitor port and the correction of power source injection expense was solved by expense balance equation. Computing results indicates that the expense transmission relation between parallel capacitor and power source impacted on both the power price of load at the node connecting with parallel capacitor and the power price of power supply.