Relay Auto Tuning Of Parallel Cascade Controller
نویسندگان
چکیده
The present work is concerned with relay auto tuning of parallel cascade controllers. The method proposed by Srinivasan and Chidambaram [10] to analyze the conventional on-off relay oscillations for a single loop feedback controller is extended to the relay tuning of parallel cascade controllers. Using the ultimate gain and ultimate cross over frequency of the two loops, the inner loop (PI) and outer loop (PID) controllers are designed by Ziegler-Nichols tuning method. The performances of the controllers are compared with the results based on conventional relay analysis. The improved method of analyzing biased auto tune method proposed for single feedback controller by Srinivasan and Chidambaram [11] is also applied to relay auto tune of parallel cascade controllers. The proposed methods give an improved performance over that of the conventional on-off relay tune method.
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