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As China Railway High-speed , heavy accelerated pace of development , traction voltage loss increases, so that the terminal voltage reduces traction , even lower than the end of the arm part of power supply non-normal state minimum requirements for network voltage (19kV), led to the train can not run , the need to take measures to improve the traction network terminal voltage , in order to ensure normal operation of the train . To solve this problem is an important and effective way to supply arms in the middle of the head-end or series capacitor compensation , which is mainly used to reduce the traction network impedance and play to improve traction network terminal voltage. The topics to Kunming railway series compensation works in the background , first introduced the traction power supply system components , the basic theory of series compensation , role and device capacity is calculated ; traction substation and then introduced two kinds of series compensation device range design. Controlled series compensation system design , first against the previous series compensation device control shortcomings, proposed remote control system design, using half-duplex master / slave communication, effectively improve the work efficiency. The next bit machine programming , PLC program uses a modular programming ideas , to facilitate future modifications and maintenance ; then introduced the design of PC and HMI functionality. Finally, the upper and lower control unit communication design. Traction series compensation device into the distance after the protective devices will impact the reliability , then according to the basic principle of distance protection countermeasures were put forward . Finally, at the scene of the Nanning-Kunming railway series compensation device voltage compensation test , and in the final thesis analyzed the test data . The series compensation device in operation since 2006 since , well , the experimental verification , the heavy , high-speed conditions, the end of the traction network voltage input from a series compensated stable before 17.6-18.9kV up to 20kV or more, completely meet the requirements of rail transport to ensure the improvement of transport capacity of Southern line .
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