Abstract
This paper presents a thorough design and comparative study of two popular control techniques, i.e., classical Proportional Integral (PI) and RST, for Matrix Converters (MCs) in terms of tracking the reference and robustness. The output signal of MCs is directly affected by unbalanced grid voltage. Some research works have attempted to overcome this problem with PI control. However, this technique is known to offer lower performance when it is used in complex and nonlinear systems. On the other hand, RST control offers better performance, even in case of highly nonlinear systems. Therefore, the RST can achieve better performance to overcome the limitation of PI control of nonlinear systems. In this paper, a RST control method is proposed as output current controller to improve the performance of the MC powered by unbalanced grid voltage. The overall operating principle, Venturini modulation strategy of MC, PI control and characteristics of RST are presented.
Highlights
Recent advances in power electronics have enabled the emergence of Matrix Converter (MC) for direct AC/AC
To prevent the spread of current harmonics caused by the MC to the supply network, an input LC filter is used
The method used to determine the gains of the Proportional Integral (PI) controller is the compensation method of poles, we note here that the interest of the compensation of the poles occurs only if the system parameters are accurately identified as gains K p and Ki are based on these same parameters
Summary
Recent advances in power electronics have enabled the emergence of Matrix Converter (MC) for direct AC/ACHow to cite this paper: Hamane, B., Doumbia, M.L., Chaoui, H., Bouhamida, M., Chériti, A. and Benghanem, M. (2015) PI and RST Control Design and Comparison for Matrix Converters Using Venturini Modulation Strategy. Venturini and Alesina proposed a generalized high-frequency switching strategy in 1980 [3] The objective of this control strategy is to achieve an ideal electronic transformer capable of varying the voltage, current, frequency and power factor [4]. Another method, known as the direct transfer function approach, proposes the multiplication of the input voltages vectors by the modulation matrix M to obtain a vector of output voltages which correspond to a point of synthesis [4]. The design approach difficulties arise with the complexity of the nonlinear systems dynamics These approaches assume a precise mathematical system model and are able to cope with nonlinearities to a certain degree. To show the effectiveness of the control methods, the performance of the system is analyzed and compared in various operating conditions
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