The Application Of Magnetic Controlled Reactor In Xinjiang Electric Railway

With the supergrid and ultra-high voltage grid put into operation, the customers require higher quality and reliability of a distribution network, which also produces a series of new problems. Large capacity and quick response controllable reactive power source is supposed to adjust voltage, maintain system reactive power flow balance,reduce network loss and improve power supply reliability due to the formation of the supergrid and intension of the load variation. Therefore according to the development of the electric power industry, research of the reactive power compensation device is a key technical issues which is very important for the operation of the electric reliability and economic growth. As a kind of reactive power compensation method, reactor is indispensable in the power system. The magnetic-valve controllable reactor, based on the principle of magnetic saturation, alter its inductance by adjusting the saturation offset through direct current. As a controllanble reactor, it has broad prospect of application in reactive compensation and filtering. The main work of this thesis focuses on applying the magnetic-valve controllable reactor in the Power quality management of Xinjiang electric railway, and make a research on the dynamic reactive compensation to validate its practicability and effect.After introducing the thesis analyzes the structure and principle of a certain controllable reactor based on magnetic saturation theory in the second chapter, its mathematical model is set up, its characteristic of working, harmonics, voltage-current, controlling and response are also analyzed, and at last work out how to select the good working condition.The third chapter studied the thyristor control methods of the MCR, including "voltage current in phase" and the "reactive current minimum", the advantages and disadvantages, the principle, the characteristics and applying conditions of each method are all analyzed, and provided the detail implementation algorithm.The fourth chapter analyzed the power quality of the Xinjiang Jingyihuo electric railway, and found the reason which lead the power factor of traction substation being generally very low. At last, a management plan combined with the actual situation is proposed.The fifth chapter first simulated the characteristic of the MCR, then realize the application of the MCR dynamic reactive compensation simulation in Aobao substation,what validates its practicability, and at last put forward the existing problem and its origin in the simulation.In the final chapter of the thesis, the analysis and summary of the total work has been made, and the further investigations about the controllable reactor are pointed out.