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LQR controller with an integral action for Z-source DC-DC converter

Debbat Mohamed, Salem Mohammed, Bachir-Bouiadjra Rochdi

Przegląd Elektrotechniczny

2019

R. 95, nr 9

89--93

This paper presents a robust linear quadratic regulator with an integral action (LQR+i) designed for Z-source DC-DC converter (ZSC) operating in conduction continuous mode (CCM). Depending on converter’s commutation states and using the electrical equivalent circuits, both switched and small-signal models of ZSC are built. The design procedure of LQR + i controller is described. The robustness of the controller is tested, using Matlab/Simulink software, considering circuit parameter (source and load) uncertainties and external signal (reference voltage) disturbance. A comparison study with classical PI controller are performed. It has been shown that the robustness of LQR + i controller is better than classical PI controller.

W artykule zaprezentowano liniowy, kwadraturowy sterownik w włączonym LQR zaprojektowany do przekształtników DC-DC ze źródłem Z. Odporność kontrolera była testowania przy wykorzystaniu programu Matlab/Simulink. Porównano sterownik z klasycznym układem PI.

A new circuit topology using Z-source resonant inverter for high power contactless power transfer applications

Ghosh P. C., Sadhu P. K., Ghosh A., Pal N.

Archives of Electrical Engineering

2017

Vol. 66, nr 4

843--854

In this study, a new circuit topology using a Z-source resonant inverter (ZSRI) for high power applications in large-air-gap contactless power transfer (CPT) systems, has been investigated. The main shortcoming of a large-air-gap CPT system is the poor power transfer efficiency due to low magnetic coupling. In order to minimize this shortcoming and to improve the overall performance of the system by boosting the power transfer capability, in this paper a CPT system with the newly developed circuit topology using high frequency Z-source resonant inverter has been proposed. Using the newly developed circuit topology for the CPT system, it has been observed that the overall performance of the system has been improved to a reasonable level with a purely sinusoidal resonant current flowing through the primary side. Therefore, no harmonics will be injected into the source. The proposed CPT system with an air gap of 16 cm and a misalignment of 3 cm has been simulated using the Maxwell finite element tool and Simplorer circuit simulation software for an output power of 2 kW.