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This paper proposes a novel pulse-width-amplitude-modulation (PWAM) method for three-phase quasi-Z source inverter system in motor drive application. It is demonstrated that it operates at only 1/3 switching frequency of traditional PWM methods, with less harmonic distortion. As a result, switching actions and losses are also reduced significantly. With the proposed modulation, the required capacitance...
This paper proposes a novel fixed off-time control method for single-phase micro-inverter operating in discontinues conduction mode. In this method, the off-time of the active switch is fixed to a constant value over the whole power level. The on-time of the active switch is obtained for current shaping without sensing inductor current. The proposed method has two advantages. One is that the switching...
In this paper, the suppression of the circulating current flowing between inverters in parallel with non-isolated dc-link is described. If the inverters are connected in parallel through sharing inductor, circulating current would follow between inverters. In early researches, the circulating current generally is considered as zero sequence component. However, circulating current is not confined as...
In this paper, the conventional three-level diode-neutral-point-clamping (3L-DNPC) inverter is deeply investigated from the view of power loss. It is concluded that the conventional 3L-DNPC inverter has high zero-vector conduction loss due to clamping Diode+ IGBT structure's high on-state voltage, high clamping diode reverse recovery loss and so on. Therefore, the clamping diodes are most deeply related...
This paper presents an FPGA-based adaptive predictive control scheme for single-phase T-type NPC inverter in applications to microgrids with high efficiency and robust performance. Predictive control is applied for current regulation to achieve fast dynamic response with low total harmonic distortion (THD). Implementation of a grid inverter with minimum inductor will result nonlinear inductance due...
This paper proposes a novel highly reliable single-stage buck-boost inverter. It can be operated as grid-connected and stand-alone inverter. In a single-stage, it can generate an output ac voltage higher and lower than the input dc voltage. The proposed inverter can be employed in grid-connected single-phase PV systems without injecting large dc current into the grid. In addition, it has no shoot-through...
The article presents the review of power electronics converters applied in induction heating. The IH application area of the medium frequency and medium power was taken into account. The different types of power electronics converters, resonant circuits and numerous control methods are introduced. The issue of inverter output and heating inductor matching is presented, including examples of solutions...
Investigated in this paper is the use of state variable feedback control combined with a PI controller for a single-phase grid-connected inverter with an LC filter operating under weak grid conditions. This condition is characterized by a grid impedance much larger than the inductance in the LC filter. Under weak grid conditions, variations in the grid impedance can degrade the performance of the...
Single-phase inverters suffer from double-frequency ripple of the input power. For mitigation, an input capacitor is applied but the fluctuation range of power across it is limited according the desired fluctuation in the dc-link voltage. To realize power decoupling without changes in the main circuit and in the control strategy of it, an additional independent power decoupling circuit can be applied,...
Multi-output converters are widely used in various electronic devices and Electric Vehicles (EVs) due to their benefit in terms of cost, efficiency and space for installation. On the other hand, Wireless Power Transfer (WPT) methods including Inductive Power Transfer (IPT) and Capacitive Power Transfer (CPT) have been applied increasingly in EVs since they are more convenient and safe as compared...
A novel integrated dual-Mosfets Forward micro-inverter is proposed in this paper to overcome the shortcomings in the existing photovoltaic micro-inverter. An inductor is connected in series to the primary side of the transformer and the leakage of transformer can be viewed as a part of the inductor. The performance of proposed micro-inverter is compared with the classical Flyback and Forward micro-inverter...
This paper proposes a wireless power transfer system with Class E inverter and half-bridge Class DE rectifier. The proposed system consists of a Class E inverter, a half-bridge Class DE rectifier, and a loosely coupling transformer. Both the inverter and the rectifier achieve zero-voltage switching (ZVS) and zero-voltage derivative switching (ZVDS) at an optimum coupling coefficient. Therefore the...
This paper proposes a controller design to compensate the current harmonics from the nonlinear load when a grid-connected inverter operates as an active power filter. When the LCL filter is installed at the output of inverter, the controller should be designed differently depending on the location of the nonlinear load. As this nonlinear load is connected to the grid before or after the grid side...
The conventional structure of buck-boost inverter uses IGBTs. IGBTs have features like long tail current, fixed voltage drop and that is why its switching losses are high. In this paper switching cells structured buck-boost inverter is proposed. In switching cell structure, MOSFETs and external diodes with very fast reverse recovery characteristics are used, while the body diodes have no chance of...
Variable carrier single rate deadbeat control method for low carrier frequency was proposed. In the large capacity inverter system, the carrier frequency range is limited to relatively lower frequency range, the trade off between the control accuracy and the efficiency should be considered. Digital hysteresis control was applied to the inductor current, suitable carrier frequency was adopted in every...
This paper proposes a power-circulating operation at light load operation for a parallelly-connected dual-active-bridge (DAB) converter in order to achieve zero voltage switching (ZVS) over entire load range and wide battery-voltage variation. At the light load, a power flow of each DAB converter is controlled in such a way that the transferred power of each DAB converter satisfies the condition for...
A digital zero-voltage switching(ZVS) current control method which is suitable for full-bridge or half-bridge inverter is proposed in this paper to achieve high power density, low cost and high conversion efficiency. The digital current control scheme is realized by DSP TMS320F28035 and does not demand complex algorithm, or extra analog circuits. Furthermore, ZVS is achieved by inductor current operating...
Conventional photovoltaic (PV) systems using a micro-inverter tend to be complex and costly as three separate converters (i.e., a boost converter, inverter, and voltage equalizer to prevent partial shading issues) are necessary. This paper proposes a novel micro-inverter integrating a voltage equalizer to achieve not only system-level but also circuit-level simplifications. The voltage can be boosted...
In this study, a mode transition scheme between a single phase half bridge 2-level voltage source converter (VSC) and a 3-level T-type VSC is proposed. The efficiency of 3-level T-type VSC can be increased by the mode transition scheme. The mode transition scheme select the efficient operation method between a 2-level and 3-level VSC. The 2-level VSC or 3-level VSC operation method are selected depending...
Grid-connected voltage source converters are widely used in various applications. In these Grid-connected converters, volume of the passive components such as AC side inductors and harmonic filters becomes sometimes a practical problem. As a solution to reduce the volume of the passive components in the grid-connected converters, flying capacitor multilevel converters are expected. The multilevel...
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