Study On Automatic Tuning Control System Of Arc-suppession Coil With Magnetic Bias Based On Dsp

With the future reconstruction of distribution network automation,especially with the development of the power system which consists of large quantity of cable, the system capacitive current to ground has been increasing dramatically, and hence more and more power systems become resonant grounded systems. For the system capacitive current compensated by arc-suppression coil, resonant grounded systems enhance the security and reliability of the power networks. And in order to make the arc-suppression coil reaches its best compensation effect, the system capacitive current to ground must be detected precisely. As the subject of dissertation for master degree,"Study on Automatic Tuning Control System of Arc-Suppession Coil with Magnetic Bias based on DSP", has great practical value.The automatic turning control system of the arc-suppression coil (ASC) with magnetic bias based on DSP is studied in this thesis. Based on the precious fixed-current variable-frequency source, the thesis proposes a method for automatically tracing the capacitance current of power system, which compares the phase-angles difference of single-phase-to-earth capacitance voltage of the power network and the injected current;and at the same time,with the excitation system of ASC, this paper proposes a communication system by using the CAN controller in the TMS320LF2407.Thus,the system can implement the tracing of the capacitance current of power system and automatic turning. The whole system is validated on the high voltage simulation network. The result shows that automatic turning control system gets good purpose in measuring capacitance current, having good compensation result and practical value. This method will be more used in the practice.