Design and application of discrete wavelet packet transform based multiresolution controller for liquid level system |
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Affiliation: | 1. EE department, Aliah University, New Town, Action Area II, A/27, Kolkata 700156, West Bengal, India;2. EE department, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, West Bengal, India |
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Abstract: | A new controller based on discrete wavelet packet transform (DWPT) for liquid level system (LLS) has been presented here. This controller generates control signal using node coefficients of the error signal which interprets many implicit phenomena such as process dynamics, measurement noise and effect of external disturbances. Through simulation results on LLS problem, this controller is shown to perform faster than both the discrete wavelet transform based controller and conventional proportional integral controller. Also, it is more efficient in terms of its ability to provide better noise rejection. To overcome the wind up phenomenon by considering the saturation due to presence of actuator, anti-wind up technique is applied to the conventional PI controller and compared to the wavelet packet transform based controller. In this case also, packet controller is found better than the other ones. This similar work has been extended for analogous first order RC plant as well as second order plant also. |
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Keywords: | Liquid level system Proportional-Integral controller Minimum description length Discrete wavelet transform based PI controller Discrete wavelet packet transform based PI controller Anti-wind up PI controller |
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