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This paper presents the application of a robust nonlinear optimal controller for regulating the active and reactive power in a grid-connected three-phase inverter, which includes an LCL filter to mitigate the total harmonic distortion. The optimal control law is derived from the Hamilton-Jacobi-Bellman equation for state-dependent coefficient factorized nonlinear systems. An integral control term...
Input current of a Current Fed Switched Inverter (CFSI) contains the switching frequency component (75 kHz) and a second harmonic component of line frequency (100 Hz) apart from the DC part. In prior designs, the second harmonic component was suppressed by increasing the size of passive components (inductor or capacitor), which makes the inverter implementation bulky. This paper presents a control...
This paper proposes possibilities of Y-connected three-leg topologies, that are built from combinations of two-level and three-level legs (hybrid structures). Therefore, four topologies are studied and compared in aspects such as harmonic distortion of output voltages and rating of power switches. Additionally, semiconductor losses comparisons in different scenarios of load (either high current or...
This paper proposes a high efficient soft-switching multiple-input positive buck-boost converter. Multiple-input converters (MIC) use usually forward-conducting-bidirectional-blocking (FCBB) switches to control their input voltages and currents. However, these FCBB switches may decrease the overall system efficiency because of their switching losses. This paper applied a soft-switching method into...
Aalborg Inverter is a kind of high efficient Buck-Boost inverter. Since it may work in “Buck-Boost” mode, the control bandwidth should be high enough to ensure a good performance under any grid condition. However, during the “Boost” operation, the control bandwidth depends much on the grid impedance if the crossover frequency is traditionally chosen lower than the characteristic frequency of system...
This paper presents an analytical model of air gapped inductor considering the nonlinear magnetic behavior of the core along with temperature variation. First, a nonlinear magnetic behavior is represented by a mathematical function, which contains three coefficients and defines magnetic flux density (B) as a function of magnetic field strength (H). Using Matlab curve fitting toolbox, these coefficients...
Buck and buck-boost ac-ac converter topologies with a center-point-clamped circuit configuration have been recently reported in literature. These converter circuits reduce the voltage stress on the bidirectional switches employed in corresponding direct ac-ac converters. This new topological structure enables access to the mid-point of voltage terminals. This paper introduces a family of such ac-ac...
Simulation of power converters is particularly necessary in the automotive industry where the requirements for rapid development and the right choice of components allow reducing design time and allowing engineers to verify by more simulations many of the preliminary versions of the electronic power schemes. In this paper we present the simulation of the back 48 to 14V converter required nowadays...
In this paper, a novel effective duty cycle method is introduced to predict the RMS and average current for power components in discontinuous conduction mode (DCM) AC-DC boost power factor correction (PFC) topologies. The proposed model can be used for power component conduction losses estimation. The RMS current and average current of power components are derived. PSIM simulation and experimental...
A novel approach to evaluate asymptotic stability of current-mode control for DC-DC power converters is given based on the singular perturbations (time-scale separation) approach. The small parameter ε which separates time scales is related to the physical values of inductances and capacitances through the LC matrix M = εS. Our approach also results in asymptotic stability of a simple robust integral...
The photovoltaic system works in stand-alone or grid applications, where the operation at the maximum power point (mPP) of generation is required. Maximum Power Point Tracking (MPPT) algorithm allows increasing the output power and it works commonly with a DC-DC converter. This work shows a novel analysis and the basic features of response about different topologies of DC-DC converters with MPPT algorithms...
Boost type converters are commonly used as pre-regulators in applications such as photovoltaics, battery storage, and power factor correction. Normally, non-isolated step-up conversion is done using traditional hard-switching boost topologies, but these suffer from low efficiency due to hard switching transitions. Soft-switching boost topologies present an opportunity to increase switching frequency...
A high step-up switched-capacitor based converter is proposed in this paper. The proposed converter features high conversion ratio, low voltage stress and continuous input current, which makes it very suitable for renewable energy applications like photovoltaic systems. More importantly, the proposed switched-capacitor cells in series with converter can be generalized in two ways, resulting in dc-dc...
This paper presents experimental validation of a high-fidelity toroid inductor modeling technique. The aim of this research is to accurately model the instantaneous magnetization state and core losses in ferromagnetic materials. Quasi-static hysteresis effects are captured using a Preisach model. Eddy currents are included by coupling the associated quasi-static Everett function to a simple finite...
Interleaved DC-DC converter employing close-coupled inductors is a popular topology among other power converters topologies. Close-coupled inductors allow the power converter to achieve high power density and high efficiency. This paper proposes a novel magnetic structure of close-coupled inductors suitable for increasing the thermal handling capability. The proposed magnetic structure is combined...
The biological treatment of industrial waste is a priority theme for the sustainable development of any society. In recent years, there has been a significant increase in the study of the efficiency and reduction of the energy costs of this process, as active sludge treatment plants are characterized by a high cost of aeration. This study aims at modeling an active sludge treatment plant based on...
In photovoltaic (PV) systems, module level power electronics has focused a lot of attention in the last years. The microinverter, also known as AC module, has shown to be an interesting solution. For this purpose, PV microinverter architectures with pseudo DC-link consisting in a DC-DC converter followed by an unfolding inverter have been analyzed as good alternatives. This paper proposes a new push-pull...
A soft-switching solution implemented to the traditional bidirectional DC/DC converter is developed. The soft-switching cell, which composed of three auxiliary switches, one resonant capacitor and one resonant inductor, is equipped in the traditional bidirectional DC/DC converter to realize circuit ZCT or ZVT operations in both energy transmission directions. Two driving methods are presented to charging...
In this paper, a new quasi Z-source inverter based on new capacitor basic units (CAQZSI) is proposed. It is possible to develop the proposed topology by using n numbers of the basic units that is one of the main advantages of the proposed CAQZSI. The boost factor equation, voltage and current equations of the capacitors, diodes and inductors are obtained for the proposed topology and developed CAQZSI...
In this paper, a current control is studied based on D-Σ digital control to improve the grid-connected performance for a three-level T-type inverter. The control principle is analyzed in accordance with the single-phase equivalent circuit of the three-level T-type inverter. The influence of the neutral-point voltage on both output current error and modulation signal is discussed, and the relationship...
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