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X-ray tube's cathode space charge effect is the main interference for real-time control of x-ray tube current. Those factors making filament current drift are unpredictable, which affects the dynamic response performance of the tube current. In order to quickly respond to a wide range of X-ray tube anode voltage, based on closed-loop control strategy of X-ray tube current, real-time voltage control...
A new non-isolated boost converter with high voltage gain is proposed in this work. This converter is suitable for nonisolated on-line UPS systems, with common neutral connection, that improves bypass circuit installation. The adopted control strategy uses a hybrid control that implements both analog and digital controllers, that implements the average current mode control. It presents characteristics...
In this manuscript, we propose an adaptive fuzzy logic controller for a DC-DC boost converter with parametric and load uncertainties. The control strategy aims to achieve accurate voltage tracking with unknown dynamics, highly parameter and load variations, and no current sensing. Therefore, robustness to uncertainties of large magnitudes is achieved without the inner current control loop, which reduces...
This paper presents a voltage doubler boost rectifier based on three-state switching cell (3SSC) for Uninterruptible Power Supply (UPS) applications. Its main features are: high power factor, reduced conduction losses, weight and volume, simple control strategy, and connection between input and output enabling the use of inverter and bypass. A theoretical analysis, simulation results and experimental...
Hybrid energy storage systems have been investigated with the objective of improving the storage of electrical energy. In these systems, two (or more) energy sources work together to create a superior device in comparison with a single source. In particular, batteries and ultracapacitors have complementary characteristics that make them attractive for a hybrid energy storage system. But the result...
The paper presents a comprehensive study on grid-connected photovoltaic (PV) systems, dealing both with control strategy aspects and performance evaluation techniques. In particular, an advanced control scheme to suitably drive the injection of both active and reactive power into a MV radial distribution grid is here discussed, highlighting its main features by means of the numerical simulation of...
The paper shows a new control strategy for the matrix converter, witch can be applied to the multiphase device. Multiphase converters (12 x12 structures) do not require costly and non effective filters and show much better over all performance than three phase ones, thus they can be utilized on a large scale. The task to be carried out by the MC, is to transform an N-phase, symmetric system of voltages...
This paper introduces the characteristics of drive system and the several running state of the SRM first. On the basis of relevant analyses such as running principle, timing characteristic and control method, this paper introduces the control policy-varying angle control and voltage chopping above base speed; fixed angle current chopping control below base speed. This paper takes a 8/6 pole, four-phase...
A novel conversion structure for photovoltaic (PV) grid connection is proposed in this paper. The conversion system is aimed to be relatively simple and effective in medium and high power range. The topology utilizes a dual two-level voltage source inverter (VSI), fed by two insulated PV fields, supplying a grid transformer with open-end connection. Use of proposed scheme doubles the output power...
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