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This paper introduces a predictive voltage controller for multilevel inverter used in Dynamic Voltage Restorer, which is able to protect a sensitive load against grid voltage sags dynamically. The compensated voltages are obtained by using Phase-Lock Loop to detect the phase and the magnitude of the grid voltage then compare to the load reference voltage. A three-phase NPC inverter with output LC...
Inductive Power Transfer (IPT) systems have been more and more popular as they offer numerous advantages over conventional wired power transfer systems in terms of convenience, safety, isolation, and flexibility. This paper presents an overview of power converter topologies as well as modulation strategies for IPT systems. Besides, a brief introduction to the overview of fundamental components in...
This paper concerns the design of a Solid-State Transformer (SST) based grid integrated battery charger with an isolated bi-directional dc-dc converter to maintain the overall system competitiveness. The proposed full bridge DC-DC converter exploits the shoot through mode in the V2G mode for the boosting purpose, which is the uniqueness of the proposed topology. The inclusion of SST in the design...
This paper proposes a new switching method to increase the efficiency in Dual Active Bridge converter (DAB). Two level PWM is general method but the efficiency is lower than three level PWM. In this paper, three level inverter is applied in DAB and the efficiency is compared two level PWM. The power loss of MOSFET checked and the power loss with three level PWM is expected to lower loss. The dead-time...
This paper reviews the existing structures for converter stages in renewable energy and motor drive systems that offer high voltage gain at the input of an inverter. The inverter may also connect the DC supply to the utility grid. For traction motor drives in vehicle and rail transport and in high-frequency transformer connected grids, bi-directional power flow capability is also required. Cascaded...
A non-isolated dual half-bridge zero-voltage-switching (ZVS)/ zero-current-switching (ZCS) high step-down converter with zero dc bias current and active clamp is presented in this paper. Owing to the use of the dc-blocking capacitors, the dc magnetizing inductance current of the coupled inductor is zero. Thus, the magnetizing current can be both positive and negative, which means that the entire core...
In this paper, a SVPWM for an indirect matrix converter (IMC) with dual output inverter has been proposed to eliminate the common-mode voltage (CMV). The presented converter is a combination of the conventional rectifier stage and a dual inverter stage for feeding open-end winding load. The principles of selecting suitable active vectors and zero vectors and then properly arranging the switching sequence...
In this paper, the dynamics of the half-bridge LLC resonant converter are investigated based on the small signal model and a piecewise PI regulation is studied and derived by simulation. Small-signal dynamics of the circuit under consideration contain many factors that may affect regulation accuracy and performance of digitally controlled regulators. The load factor is specifically addressed here...
This paper presents an enhanced reconfiguration method for the cascaded H-bridge inverter (CHBI) that maintains high quality of the output voltage waveforms. This method is based on controlled shifting of the system neutral point together with the phase-shifted pulse-width modulation (PS-PWM) scheme. During fault conditions, if the carrier signals are not properly adjusted in the healthy working power...
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