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A Comparative Study on PI – and PD – Type Fuzzy Logic Control Strategies

A Comparative Study on PI – and PD – Type Fuzzy Logic Control Strategies
	© 2021 by IJETT Journal
	Volume-69 Issue-7
	Year of Publication : 2021
	Authors : Ngoc-Khoat Nguyen, Duy-Trung Nguyen
	DOI :  10.14445/22315381/IJETT-V69I7P215

How to Cite?

Ngoc-Khoat Nguyen, Duy-Trung Nguyen, "A Comparative Study on PI – and PD – Type Fuzzy Logic Control Strategies," International Journal of Engineering Trends and Technology, vol. 69, no. 7, pp. 101-108, 2021. Crossref, https://doi.org/10.14445/22315381/IJETT-V69I7P215

Abstract
Control strategies applying intelligent techniques e.g. fuzzy logic have been able to completely replace conventional regulators such as PI, PD and PID on designing an efficient control system. This paper investigates a comparative study of two fuzzy logic controllers (FLCs) which are representative of typical fuzzy logic – based control schemes. The working principle of such two FLCs are highly similar to the conventional PD and PI regulators, leading to the corresponding PD and PI-type names. The two FLCs proposed in this study are compared in terms of working principle as well as applicability for a specific control problem. A condition to evaluate the differences between such two FLCs is that they are employing the same input signals and fuzzy logic rule sets. Two scenarios of fuzzy rule sets are also provided for the comparison purpose. Numerical simulation results obtained by using MATLAB/Simulink environment demonstrates the feasibility of such two FLCs as well as asserts the dominance of the PItype FLC together with a fully reasonable fuzzy rule set.

Keywords
PD-type FLC, PI-type FLC, Input/output relationship, Fuzzy rule set, Control performance.

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