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The dynamic frequency stability issues in microgrids with large penetration of low inertia and intermittent photovoltaic (PV) systems can be improved by using virtual inertia (VI). A VI is the combination of energy storage system, power electronics converter and a proper control algorithm. This paper presents design and experimental verification of the VI in a PV-diesel generator based remote microgrid...
In this study, the feedback controllers for a power converter were designed and implemented to fulfill the constant-voltage (CV) and constant-current (CC) output modes. The topology used by the DC-DC converter was a phase-shifted full-bridge with a parallel current-doubler rectification converter (PSFB-PCDRC). In order to design the feedback controllers for the PSFB-PCDRC CV and CC operations, the...
A control system that includes a network in a feedback loop often becomes unstable, owing to a time delay in the network. Synchronous time-division multiple access (STDMA) is a dynamic routing protocol that achieves low-delay time communication. STDMA is expected to be a potential candidate in the design of a feedback control system over a network. Therefore, this paper analyzes stability and performance...
Most of the modern industries have multivariable processes wherein interactions exist. As the process outputs and inputs are coupled, designing controller for MIMO processes is a challenging task. The effective open-loop transfer functions (EOTFs) between the paired process input-output variables have complex high order dynamics. While many of the decoupling control methods uses effective transfer...
Connecting legs in parallel in a buck convertor is a way to increase the output current by improving the output's waveforms. By coupling these legs, it is possible to reduce the current ripple and thus the coil volume; however this coupling adds internal variables which must be controlled in order to prevent saturation of the iron core in the couplers and keep the linearity of the system. This paper...
This paper proposes a novel type of fast convergence robust controller for a non-laminated magnetic bearing system whose dynamics is governed by a non-commensurate fractional order model. The key feature of this approach is the use of Fractional Order PID sliding manifolds and the appropriate sliding mode control law developed to assure the robustness. The stability of the closed loop system is ensured...
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