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Model Predictive Control (MPC) becomes more prevalent in power converters due to its faster response in tracking the reference values of the controlled variables. In this paper, the MPC is applied on the Switched-Inductor quasi Z-Source Inverter (SL-qZSI) topology. The MPC modeling for the capacitor voltage, inductor current, and output load current of the topology are designed to predict their values...
This paper proposes a charging scenario of a battery power bank constructed by a number of buck-boost type battery power modules (BPMs) in parallel. With associated power electronic converters, the BPMs in the power bank can be individually controlled. The charging scenario is programmed to fully utilize the available power from the dc source, and at the same time to perform charge equalization during...
This paper describes a new application of SEPIC (Single Ended Primary Converter) and Cuk converter for distributed generation systems. A DC/DC converter configuration based on a combination of both converters is proposed. In the resulting topology the switching node is shared by the SEPIC and Cuk converter, since they have the same instantaneous duty cycle. This topology allows the connection of renewable...
Bidirectional power flow in energy storage facilities is common and required. Energy supply from energy storages and energy imbursement back to the storages and preferably at high-efficiency are basic operations for these kinds of equipment. Since the boom growth on uninterruptable power supplies for critical loads and electric vehicles, storages, especially batteries, are in deep demands nowadays...
Current sensing techniques are widely used for over current protection and current mode control of switching DC-DC converters for loop control. The major drawback with the conventional current sensing technique is that the accurate tuning of the low pass filter time constant with the inductor and its dc resistance (DCR) is required. However, this can hardly be guaranteed as the tuning depends on the...
This paper presents a current control method for totem-pole PFC-rectifiers which avoids the need for expensive sensing circuits. The design makes use of only one switch current as current feedback signal. The control method is based on a detection algorithm for conduction mode detection in mixed conduction mode (MCM) operation. Using a DSP the mode detection is calculated on-line and based on the...
The increase in non-linear loads in the electrical network deteriorates the voltage waveform quality. One of the most used methods to correct the quality lack is to use shunt, series or mixed topologies of active power filters. Mixed filters can compensate loads that generate voltage harmonics and current harmonics, but the economic investment is high. Commercial shunt filters are more widespread...
This paper deals with a new ZCS bidirectional buck-boost converter for the energy storage applications. The conventional buck-boost converter is upgraded with an auxiliary resonant circuit to obtain the zero current switching during commutation of main IGBTs. The key advantage of this proposed topology has the reduced switching losses, as all the switching devices are operated in ZCS soft-switching...
Recently, reduced switch-count converters have garnered exceptional attention in power electronic systems due to the diversified advantages such as low cost, low weight and volume, and high reliability offered by them. In this paper, a novel design of single-phase inverters with a reduced number of switching devices is proposed based on the single-ended primary-inductance converter (SEPIC). The proposed...
Conventional maximum power point tracking (MPPT) algorithms are designed under assumption that all modules are uniformly insulated and therefore can be characterized by a single maximum power point (MPP). At increasing power level PV arrays become larger in area. Moreover, to achieve a reasonable voltage level modules are connected in series, creating strings. These two factors make any array susceptible...
This paper presents a novel class of quasi-Z-source galvanically isolated DC-DC converters intended for the integration of low voltage renewable energy sources into a DC microgrid. These converters combine characteristics of the transformer based and the inductor based impedance-source galvanically isolated DC-DC converters. They feature the continuous input current essential for photovoltaic applications...
This paper discusses the inductor-saturation-aware design of switching power supply. A new modeling and analysis method is presented, including thermal dependence of parameters, which allows a reliable prediction of current waveshape and consequent losses for Ferrite Core (FC) inductors. The proposed algorithm can be easily applied to predict the range of the operating conditions sustainable for FC...
This paper proposes a circuit that combines the class E inverter with DC-DC converter so as to provide dual controllable outputs. This study is motivated because the industrial equipment often needs different voltage sources to operate, yet with an inadvertent choice of parameters in the isolated converters, the voltage quality is often highly affected. Therefore, by connecting an auxiliary power...
Renewable energy sources entail the power electronics inverters are the orbit of research objectives for optimum operation. Two commonly used inverters exist; the current source inverters (CSI) and the voltage source inverters (VSI). The first one supports only the boost capability and the other supports the buck capability, but due to the high variation of the output voltage of these renewable energy...
Development of control strategies for grid connected power converters is a fundamental aspect for applications such as integration of renewable energy sources, motor drives and energy storage systems. Hence, this topic has received significant attention from both academic and industry researchers. This paper presents the use of the Reduced Optimal Switching Sequence Direct Power Control (ROSS-DPC)...
This paper presents a multipurpose converter for solar photovoltaic (PV) systems. The main purpose of this converter is to serve as a transformerless grid connected inverter having solar PV array at its input. In addition to this the same converter can be employed for catering to dc load simultaneously. The aforementioned dc load can be supplied from the PV array and/or the grid. Thus the proposed...
In the recent past, we have observed great advances in the way that people are connected, from social networks to small smart devices At the same time, we are entering the era of smart cities and the internet of things, where sustainability and quality of life are key concerns. Despite these trends, we did not observe an equal level of adoption of technologies or services that leverage the automation...
In Z-Source Inverters (ZSI), the modulation strategy determines the size of the inductors and capacitors as well as the system losses. In this paper the impact of the modulation method on the design of the passive components is examined in detail with an Interior Permanent Magnet Synchronous Machine as load. Specific features of several modulation methods are presented for steady state operation and...
Interleaving of voltage source converter legs enables higher output currents per phase, effectively increasing the power rating without increasing semiconductor ratings. Different switching patterns between the converter legs increase the number of Thevenin output voltage levels and, hence, the quality of the waveform but also generate circulating currents within one phase. This paper proposes a controller...
A novel dimmable LED driver is presented in this paper. The circuit topology uses two active switches. One active switch shared by a buck-boost converter and a buck converter is operated at a high-switching frequency while the other one is low-frequency pulse-width modulated to dim high power light-emitting diodes (LED). The buck-boost converter plays the role of a power-factor corrector (PFC). It...
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