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This paper discusses an isolated three-phase AC-DC converter using Modular Multilevel Converter (MMC) topology for a medium voltage application. The MMC at a primary stage of an isolated AC-DC converter directly obtains the high frequency AC voltage from the three-phase AC voltage of the commercial frequency. In addition, the proposed system obtains the low total harmonic distortion (THD) in the input...
The concept of ultra fast charging of Electric Vehicles (EVs) is expected to contribute significantly to their widespread utilization in long-distance travels. Towards this direction, emerging power electronic topologies will be the key components of the developed charging infrastructures. Lately, a novel converter architecture has been proposed for such a purpose. The latter is based on a Cascaded...
Microgrids are distributed generation structures that link groups of Distributed Generators (DGs) to either connect to the utility grid, or to operate as a standalone (islanded) system. However, the injected power from each DG must be carefully controlled to ensure reliable power distribution, balanced modular operation, and regulated voltages across the microgrid. It is commonly accepted that DG...
In this paper the problem of effective current control in Switched Reluctance Machine (SRM) drives is addressed. A sliding mode pulse width modulator (SMPWM) is introduced to govern the inherently highly nonlinear system dynamics. The proposed SRM drive is analyzed theoretically and subsequently validated through simulation. Satisfactory dynamic performance and precise speed control with reduced torque...
Photovoltaic (PV) inverters autonomously adjust their DC-link voltages to maximize power generation. Around sunrise or sunset, a PV inverter may operate at much lower DC-link voltage than the nominal level due to the low irradiance. The inverter would be under over-modulation if the DC-link voltage is relatively low to the grid voltage at the point of common coupling. In this paper, a series of implementation...
A higher order passive power filter (LLCL-filter) for the grid-tied inverter is becoming attractive for the industrial applications due to the possibility to reduce the cost of the copper and the magnetic material. To avoid the well-known stability problems of the LLCL-filter it is requested to use either passive or active damping methods. This paper analyzes the stability when damping is required...
This paper presents an optimized tuning method of Proportional Resonant (PR) current controllers implemented in the stationary frame. The approach consists of defining three operation regions based on behavior of the closed loop poles, and of determining simplified tracking and disturbance transfer functions for each of these regions. Charts of proportional and resonant normalized gains versus settling...
This paper examines the fault ride-through strategy of a three-phase PV system with respect to compliance to the German Transmission Code. Specifically, the paper examines the case of a single line-ground fault which occurs predominantly in the distribution system. The paper proposes the injection of reactive power on a perphase basis to the faulty phases while maintaining active power injection to...
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