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Generally, selective harmonic elimination (SHE) complexity for multilevel converters increases with the increase in number of levels. In this paper, an approach for multilevel converters' SHE is introduced. This approach is based on cancelling the 5th and 7th order harmonics irrelevant of the number of levels in three-phase cascaded-type multilevel converters with unequal DC sources, such that the...
The control of power electronic converters is subjected to several challenges as measurement sensors drift, malfunction in harsh environments, non-ideal grid, and performance degradation due to the delay of discrete control systems. In this paper, a stationary frame resonant current controller for inverter-based distributed generation (IBDG) with sensor-less grid voltage operation is proposed. The...
One of the main issues accompanied with the high penetration of PV distributed generation (DG) systems in low voltage (LV) networks is the overvoltage challenge. The amount of injected power to the grid is directly related to the voltage at the point of common coupling (PCC), which necessitates limiting the amount of injected power to the grid to conservative values compared to the available capacity...
Energy storage systems have become an essential part of power utilities due to their capability of providing high level of power quality and stability. Flywheel energy storage systems (FESSs) are now employed with numerous grid and renewable energy applications due to their operational merits. Some of these applications are related to fault ride-through and critical load support. Therefore, the reliability...
The development of static power converters capable of transforming DC energy obtained from alternative sources into AC has become one of the main challenges in renewable energy systems. In this context, the buck-boost inverter is advantageous for being capable of providing an AC output voltage higher or lower than the input DC voltage in a single power conversion stage. In this paper, a controller...
Reliable balancing of active power generated via wind farms is vital for power system stability and for maintaining system frequency deviations within acceptable limits. This paper presents a backup power balancing technique for the energy-fed voltage source converter high voltage DC transmission systems during different AC side faults based on flywheel energy storage systems. The proposed technique...
Offshore wind energy is now seen as a key contributor to the renewable energy future. HVDC technology is among the chief technologies enabling widespread use of offshore wind. This paper proposes a new configuration, namely, Multimodule Buck-Boost Inverter (MBBI) for HVDC transmission applications. The MBBI consists of several simple buck-boost converters that can be easily assembled for high-voltage...
This paper presents a simple active-power control technique for low voltage grid-connected three-phase inverters with zero injected reactive power (unity power factor at grid). Two versions of the proposed controller are introduced, namely, open-loop and closed loop controllers. The proposed controller is characterized by lower computational burden and reduced number of sensors, which are desired...
Multiphase induction machine is normally controlled using rotor field oriented vector control. Under phase(s) loss, the machine currents can be optimally controlled to satisfy certain optimization criteria. In this paper, a vector control scheme to a five-phase induction machine is introduced to ensure equal phase currents and minimum torque ripples under a phase open circuit. The controller idea...
Energy storage is becoming a basic component of modern renewable power plants, especially wind farms. For several considerations, local wind turbine (WT) energy storage is preferred. Flywheel energy storage is among the most promising storage systems regarded for wind applications. This paper proposes a new architecture for flywheel energy storage based on doubly fed induction machine (DFIM) where...
Currently, in high performance computer systems, processors are faster and have vastly increased in performance and computational power. It is important for system designers to get an early estimation of power dissipation to meet the challenging methodologies for power dissipation reduction and optimization. In addition to the current design methodologies, the designer might need to consider the factors...
A dynamic voltage restorer (DVR) is a series connected device that can support the voltage at existing critical loads during voltage sags. Voltage restoration may need active and/or reactive power injection into the distribution feeder. Due to the limitation of the DVR energy storage element, the Interline Dynamic Voltage Restorer (IDVR) can be used to mitigate the voltage sag in distribution systems...
A new control strategy for megawatt scale series connected multilevel photovoltaic (PV) inverters is proposed. The proposed strategy ensures balanced operation under partial shading. Further under transient grid conditions such as low voltage ride through (LVRT) it is shown that the system remains connected and is fully controllable. In the proposed system, the PV arrays are grouped into zones and...
In this paper, a new control strategy for megawatt scale multilevel photovoltaic (PV) inverters under partial shading is proposed. In the proposed system, the photovoltaic arrays are divided into zones and each zone is connected to DC to AC inverter. The DC to AC inverters of multiple zones are connected in series to form the required medium voltage and transfer power to the grid. In such a system...
The polymer electrolyte membrane fuel cell (PEMFC) has been projected to be the fuel cell of choice for future automotive applications. Among the most challenging aspect of this application is the occurrence of severe and frequent changes in power demand. This paper will present a model aimed at mimicking the load expected in a fuel cell vehicle, including a DC motor, DC-DC converters and a rechargeable...
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