Double closed-loops control application in high frequency chopped wave cascade speed control system

The high frequency chopped wave cascade speed control system has an overt advantage on less controlling voltage, lower controlling power, simple structure and little technique difficulty, thus it is widely used in more and more industrial sites, especially the energy saving and improvement of high voltage, huge power fan blower and water pump. So, it is important to analyse and study the dynamic characters about this system. In this paper, the principle about it is firstly introduced. Then, the basic relationship between the input and output parameters of the main circuit is analysed by means of state-space averaging method. Subsequently, the simplified math model is derived. On the base of it, the simplified dynamic model of the high-frequency chopped wave cascade speed control system is deduced. According to this mathematical model, the dynamic characteristic structure graph is presented. At last, the corresponding current loop and speed loop are designed by means of using the model-optimizing engineering method and harmonic vibration peak minimum guide, and the double loops design is verified by the simulation model constructed in the simulink software. The controlling results acquired from simulation are satisfied.