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Based on the compensation degree of shunt reactor and series capacitor under the case of uniform placement, the voltage profile and transmitting power of EHV/ UHV transmission line are analyzed by using π-type equivalent circuit of long transmission line arranged at both ends of controllable shunt reactor. The impact of series capacitor on the compensation degree of controllable shunt reactor are studied deeply by analyzing the compensation degree of sectional placement controllable shunt reactor and then the mathematical expression of compensation degree of controllable reactor with uniform series capacitor compensation is derived carefully. The research results show that the segmented distance of controllable reactor is influenced by compensation degree of series capacitor and with the increase in the degree of series compensation, segmented distance increases. Keywords-extra high voltage (EHV)/ultra high voltage (UHV); controllable shunt reactor; series capacitor compensation; voltage profile; compensation degree

Compensation degree of controllable shunt reactor in EHV/UHV transmission line with series capacitor compensation considered