A Cooperative Control Method between OLTC and Thyristors for High Power Industrial Rectifier System

In general on-load tap changer (OLTC) device and rectifier of high-power rectifier system are adjusted respectively regardless of cooperative control, which will result in oscillation during output adjustment of the rectifier system and lead to poor stability. In order to realize cooperative control between OLTC and thyristors, a decouple control model was established, and then a cooperative hybrid control algorithm, combining expert arbitration strategy and fuzzy adaptive control, was designed. In addition, a time-shared control was implemented during dynamic adjustment of the system to guarantee adjustment efficiency and power quality. Moreover, taking a new industrial rectifier system with inductive filtering as a test object, the design process of the mentioned cooperative control was presented and the simulation and experimental results were shown for verifying correctness.