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Multi-inverter and multiphase power electronic installations have additional degrees of freedom for construction of system topology, and for the choice of modulation schemes and algorithms for control of inverters in these systems. It has been shown, that in combined six-phase drives on the basis of two standard inverters and two neutral-point-clamped converters symbiosis of specialized control schemes...
The current paper aims to put forward the arrangement of a new high speed, low power synchronously clocked NOR-based JK flip-flop embracing modified Gate Diffusion Input (GDI) procedure in 45nm technology. The propounded design on comparison with a synchronously clocked NOR-based JK flip-flop employing the traditional CMOS transistors, transmission gates and Complementary Pass-Transistor Logic (CPL),...
In droop-controlled inverter-based microgrids, component mismatches and parameter drifts may have a significant effect on system stability. Analyzing this practical and important problem, it is shown that droop control is sensitive to such drifts and certain conditions have to be satisfied to maintain stability. Furthermore, these mismatches lead to a deviation in power sharing between the droop-controlled...
The use of fine-grain Dynamic Voltage and Frequency Scaling (DVFS) has increased the number of distinct clock domains on a given Network-on-Chip (NoC). This necessitates robust synchronizers to prevent clock domain communication failures, even as FinFET devices have begun to replace planar devices. This paper presents simulation results and comparisons between dynamic (requiring reset) and non-dynamic...
This paper shows a novel design and implementation of a multi-purpose power module used to manage the energy produced by renewable energy sources and at the same time compensate the discontinuous power absorption from loads, with the final goals to increase power distribution efficiency and grid stability.
This paper illustrates the potential of using projects like IEEEs International Future Energy Challenge as a way to consolidate acquired knowledge and independently deepening it. To do so, the opinion of both a participating student and the supervising professor are stated using the example of the controls of a solar energy system.
This paper presents a novel approach to deal with the synchronization of microgrids to the main grid. It is based on the use of a power electronic device derived from the original concept of the SSSC (Static Synchronous Series Compensator). The proposed scheme considers the connection of this device at the point-of-interconnection (POI) of the microgrid to the low voltage side of the substation transformer...
The operation of low/full swing LC resonant clocking scheme helps in reducing the overall power of the system by introducing a modern new flip-flop. The proposed dual mode low/full-swing differential conditional capturing flip-flop (LF-CCFF) operates with a low/full-swing sinusoidal clock through the utilization of reduced swing inverters at the clock port. The LF-CCFF reduces the power consumption...
Power converters are the subject of extensive research because of their ability to work under different operating conditions, providing bidirectional power flow, high dynamic range and fast response. These advantages allow them to be used as an interface between the electric grid and many high power applications such as motors, energy storage, active filters and renewable energy sources. To be able...
In this paper we investigate the use of distributed PI actions to achieve consensus and synchronization in complex networks. We show that by extending the classical linear diffusive coupling with an integral action it is possible to achieve better performance and steady-state behavior than with more traditional strategies. After briefly summarizing the theoretical results, we investigate the viability...
Basic schemes of discontinuous synchronized space-vector modulation (providing continuous phase voltage symmetry), including combined scheme of discontinuous PWM, have been disseminated for control of dual inverters (with multilevel phase voltage) of transformer-based photovoltaic installation. Simulations give a behavior of these systems.
A universal control method to operate the single phase inverters was proposed recently. The proposed method can operate the inverter regardless of whether it is connected to a stiff grid, to a weak grid, or to a load. Moreover, the transition between these modes of operation can be performed seamlessly. This feature makes the proposed method promising for smart microgrid applications where flexible...
Energy and sustainability are now on the top agenda of many governments. Smart grids have become one of the main enablers to address energy and sustainability issues. Many research centres have been set up worldwide to address various aspects of energy and sustainability. Renewable energy, distributed generation, hybrid electrical vehicles, more-electric aircraft, all-electric ships, smart grids etc...
A bidirectional battery charger using a three-phase voltage source inverter (VSI) is presented to be employed in plug-in electric vehicle applications enabling Vehicle-to-Grid (V2G) and Vehicle-to-Home (V2H) functionality with simultaneous active and reactive power control. The charger is controlled by a grid supervising unit with voltage droop control, providing it with P (active) and Q (reactive)...
One of the main electrical characteristics of weak grid is high grid impedance, which will easily lead to harmonic resonance and grid voltage waveform distortion. Distorted grid voltage can make the phase-locked loop of photovoltaic (PV) grid-connected inverter occur deviation even failure and power quality deteriorates. Aiming at the problem, this paper takes the LC-type PV power generation system...
The paper describes methods and techniques of synchronized space-vector pulsewidth modulation (PWM), providing symmetry (quarter-wave symmetry and/or half-wave symmetry) of the output voltage waveforms of modulated voltage source inverters for adjustable speed drives. In this case spectra of symmetrical output voltage of inverters do not contain subharmonics (of the fundamental frequency), which are...
The integration of small sized standalone solar systems to the grid is technically complicated resulting into expensive operation which is not affordable to all. As such, this paper presents a smart controller based design using digital signal processing for cost effective operation of solar-grid tied system. The hybrid system is able to size the connected system and deploy the operation strategy...
Grid synchronization instability issues and low frequency oscillations between synchronous generators exist in electrical power system. This kind of stability issue happens between paralleled power converters is also reported. Analysis based on small-signal model of inverters with phase-locked loops (PLL) has been proposed. Different from that approach, which needs detailed inverter and controller...
This paper proposes a method to parallel m digital controlled cascaded H-bridge (CHB) multilevel inverters directly with high bandwidth current sharing capabilities. The proposed method utilizes switch signal synchronization with dead time control to eliminate circulating current and adopts “piecewise” master-slave strategy to achieve equal current distribution in less than one cycle. A prototype...
Renewable-intensive microgrids are mainly actualized using voltage-source inverters (VSI). Voltage-controlled and current-controlled VSIs can manage voltage/frequency and active/reactive power flow in microgrids, respectively. A two-layer cooperative strategy is proposed that simultaneously controls both the voltage/frequency as well as the active/reactive power flow. The proposed strategy is fully...
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