Design and investigation of Fuzzy-PI and RST controllers for a high performance matrix converter using Venturini modulation strategy under distorted grid voltage

The purpose of this paper is to design and control the load´s current of a Matrix Converter (MC) using both Fuzzy-PI and RST controllers in terms of tracking the reference and robustness. RST controllers present a time delay on the system´s transient response. This technique is known to offer lower performance when it is used in complex and nonlinear systems. On the other hand, fuzzy-PI control offers better performance, even in case of highly nonlinear systems. In this paper, a Fuzzy-PI control strategy is proposed as an output current controller to improve the performance of the MC powered by unbalanced and distorted grid voltages. The overall operating principle, Venturini modulation strategy of MC, Fuzzy-PI control and characteristics of RST control are presented. Our investigation shows that the Fuzzy-PI can give better performance to overcome the limitation of RST control in nonlinear systems. To show the effectiveness of the control methods, the performance of the system is analyzed and compared in various operating conditions.