AES Sul's experiences using series compensation on medium-voltage distribution system

This work relates the experience of AES Sul on implementing series compensation to solve voltage drop problems on feeders. First, measures from a system, which present about 300% of compensation, will be showed. During the energizing, that feeder presented significant voltage oscillation. It occurred on every test was made due to the coupled between series capacitor and three-phase induction motors used in pumps on rice farms. The analyze of that situation showed significant voltage instability what makes impossible its work. After the analyze of damp insertion on electromagnetic transient programs, it was decided to install this series capacitor in another feeder. On that other feeder, the results were good, obtaining an elevated compensation level and a well voltage behavior. These results are also presented on this work.