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This paper presents a grid-connected bi-directional modular multilevel converter (MMC) with division-summation (D-Σ) digital control to achieve power injection and rectification functions. The D-Σ digital control is adopted to track current reference, regulate dc-bus voltage and cell voltage, and balance the upper and lower dc-bus voltages. It can accommodate wide filter inductance variation and take...
This paper presents a three-phase transformerless uninterruptible power supply (UPS) with sinusoidal pulse width modulation (SPWM) based division-summation (D-Σ) digital control. A transformerless UPS controls the power flow between dc link and utility grid, as well as tracks the ac reference voltage. The proposed control law derived with D-Σ digital approach takes into account the effects of dc-link...
With the development and deployment of IEC 61850 based smart substations, cybersecurity vulnerabilities of supervisory control and data acquisition (SCADA) systems are increasingly emerging. In response to the emergence of cybersecurity vulnerabilities in smart substations, a test-bed is indispensable to enable cybersecurity experimentation. In this paper, a comprehensive and realistic cyber-physical...
The ferromagnetically coupled ferroelectric domain walls (DWs), which may be more conductive, in multiferroic material BiFeO3 (BFO), make it possible to realize intrinsic multiferroelectricity in single phase material and open a chance for combining spintronics and ferroelectricity in multifer-roic systems.[1] From the aspect of conductivity, the conductive DWs will influence the macroscopic transport...
Terahertz surface plasmon polaritons propagating in the surface of semiconductor are switched by varying the plasma frequency through a temperature effect. A device design is proposed to achieve the desired functionality.
In this paper, simple modeling of the DC-DC converter is presented, which is based on the current in the switch and the voltage on the switch, together with some other variables. Two types of DC-DC converters are used herein to verify the proposed modeling method.
Bulk memory copies incur large overheads such as CPU stalling (i.e., no overlap of computation with memory copy operation), small register-size data movement, cache pollution, etc. Asynchronous copy engines introduced by Intelpsilas I/O Acceleration Technology help in alleviating these overheads by offloading the memory copy operations using several DMA channels. However, the startup overheads associated...
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