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A family of single phase converters with reduced number of components is introduced in this paper. There are two switches, one coupled inductors and one capacitor in their structure, therefore the cost is reduced considerably. The proposed converters can be used as four quadrant DC/DC converter when fixed duty cycle (D) is applied to switches. On the other hand, they can be used as single phase inverter...
Parallel connected multi-modular (M-M) singlephase UPS inverter system is an attractive choice for a reliable and scalable power delivery for critical loads. However, a proper current sharing control technique is required to avoid the inter-modular circulating (IMC) currents without use of any extra power circuit components. The output current of an UPS module is used as load disturbance compensation...
Present work aims to remove the source current harmonics of order 6n±1 where, n is an integer present in power utility system under realistic scenario. This realistic scenario represents a harmonically unbalanced condition which is caused by multiple non-linear loads attached to different phases of 3-phase power supply. It creates different amplitude spectrum of individual source current harmonic...
The present work aims to remove dominant current harmonics (5th,7th,11th and 13th) of a 240V(rms) utility at the point of common coupling for the harmonically unbalanced condition of source current, using parallel combination of two shunt hybrid active filters. The harmonically unbalanced condition of source current has been created by connecting different types of non-linear loads in different phases...
Z-Source inverters can overcome some of the limitations, inherent in traditional Voltage Source and Current Source Inverters and can provide boosted outputs. Most of the literature on Z-source inverters deals with 3-phase or 1-phase bridge inverters. This paper proposes a Single-Phase Z-Source Push-Pull Inverter topology. This scheme has several advantages compared to basic Z-source full-bridge inverter...
In this paper a new coil design has been proposed, called as Quad D Quadrature (QDQ), in order to keep the maximum flux linkage between wireless charging system (WCS) coils even with reasonable misalignment. The proposed coils use their inherent five flux linkage loops at zero misalignment and three loops when encountered 50% misalignment between coils. The careful selection of optimized parameters...
At present, due to over-exploitation and utilization of non-renewable resources such as fossil fuels, the energy crisis has become a worldwide problem. In this context, the inexhaustible solar received more and more attention. Photovoltaic is one of the main formal uses of solar energy. This paper expounds the advantages of micro-inverter systems and analyzes the design requirements of micro-inverter...
This paper described a synchronized output regulation (SOR) strategy for control of inverters working in grid-connected and stand-alone modes. As a concept of networked dynamic systems, SOR means that the nodes have their outputs synchronized but also demonstrate the desired wave shape. Both the inverter and the utility are regarded as two nodes of the simplest network consisting of themselves. In...
The simulation of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Various simulations, varying the torque and current tolerances, are carried out in the low torque and high torque range. Simulation results show a direct influence...
In this paper, two types of isolated converter topologies for the implementation of the galvanic isolation of a low-voltage DC network is discussed. Advantages and problems of the topologies are compared and a selection for the suitable topology for two conversion ratios, 1:1 and 2:1 is carried out. The selection is carried out by comparing the life-cycle costs of the converters if used in the low...
This paper presents a design methodology for a first order L filter inductance used to connect a three-phase power converter to the grid. This method uses the desired THDi to calculate the L filter inductance to ensure the grid-connection standards are met. This methodology was designed for converters operating with Space Vector PWM modulation.
This paper proposes a class-E2 inductive power transfer (IPT) system with pre- and post-regulators. The proposed system can maintain high system efficiency against coupling-coefficient and load variations by maximum efficiency tracking. Additionally, the system size can be reduced by sharing inductors. The feasibility and the usefulness of the proposed system were investigated by circuit experiments.
Dual-buck circuit has higher reliability as it overcomes the straight-leg problem existing in the traditional bridge circuit. However, more magnetic components are needed in this topology, especially in three-phase dual buck inverter. Magnetic integration is a good way to reduce the volume and weight of the magnetic components and improve the density of the system. The coupled-inductor dual-buck circuit...
The grid connected photovoltaic (PV) system have been modeled and simulated using control algorithm with dedicated PI control for dc link voltage regulation. Generally, the PI controller used for the system is tuned using trial and error method but this method is having manual limitation for the tuning of controller so as to obtain the desired response like as regulating dc link voltage to reference...
Series-series (SS) compensation is widely used in contactless power transfer (CPT) for electric vehicle because of their constant current and constant voltage charging features. In this paper, a mathematical model of SS compensation for CPT system is presented. This model includes the effects of harmonics on parameters of SS compensated CPT system. Fourier series analysis is used for mathematical...
Simulation is a fundamental tool for the design of next generation power systems. At the same time, existing simulation methods are inadequate to tackle the complexity of such systems. In this paper we present a simulation approach based on the combination of Quantized Discrete Event System Specification (QDEVS) and the Latency Insertion Method (LIM). The combination of these two approaches leads...
The opportunities for both power density and efficiency improvements of photovoltaic (PV) inverter have come with the development of commercially available wide bandgap (WBG) devices such as Gallium Nitride (GaN), and Silicon Carbide (SiC). The focus of this paper is to demonstrate a methodology for achieving a minimum volume of the differential and common mode parts of the output filtering while...
This work provides a simple and effective state space discrete-time model for LCL filters connected to the grid with uncertain inductance. This model is suitable for the design of digital robust controllers for this application. The proposed description is given by the combination of matrices obtained for the minimum and maximum values of the grid inductance, and is capable to provide small errors...
This paper proposes a synergistic operation of distributed compensators. By a synergistic operation, a part of a distribution system can behave as a single element. Two distributed compensators are responsible for achieving the operation. The grid may demand three requirements from the element: cancellation of the input current, operation under unit power factor and injection of active power into...
The objective of this paper is to design partial state feedback controllers, in order to reduce the number of sensors needed to implement this strategy for current control of grid-connected converters. The resulting control vector is suitable for digital implementation. The control gains are computed by means of linear matrix inequalities. The grid inductance is considered as an uncertain parameter...
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