Abstract
Fractional order PID controller has two degrees of freedom more than the integer order PID controller,and it has better control performance. The paper briefly describes the fractional order PID controller, and through Ziegler-Nichols type tuning rules, Padula & Visioli tuning rules and tuning by minimization methods to achieve fractional order PID controllers respectively. Additionally, the Oustaloup approximation methods are both introduced. Based on these methods, we have considered the steam pressure model and the vehicle wire control system. The simulation result shows that control system stability can be obtained by using the tuning-rules proposed in this paper.
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