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Due to the advantages of cost, volume and efficiency, transformerless grid-connected power converters have drawn an increasing attention, especially in low-power PV applications. However, the lack of isolation between inverter and grid brings in some potential risks to the distribution network. Among them, the dc injection flows into the grid remains a significant concern. Owing to the offset and...
Reliable fault indication is crucial in any distribution feeder management system. A distribution line protective device can use different algorithms to detect whether or not it is in the fault path. When the downstream fault involves all three phases, detection is typically easy to achieve and phase elements are sufficient. Single line to ground faults cannot always be treated in the same manner,...
Protection coordination represents one of the main challenges in the developing process of reliable and efficient DC systems. In the current research, a new protection coordination scheme based on fault matrix concept was developed. A testbed was established at Institute of High Voltage Engineering and Electrical Power Systems (elenia) laboratory, Braunschweig University of Technology to verify the...
Robust management of short-circuit faults in MVDC systems must rely on a combination of communication-dependent and communication-independent methods. In one approach, an MVDC system is designed to operate without breakers [1], so both methods rely on coordinated control of power converters and non-fault-breaking mechanical disconnect switches to effect the fault clearance process-fault detection...
Multilevel converters have been widely used in traction drive systems due to their attractive output performance. However, one major disadvantage of multilevel converters is the large number of switching devices employed, which could increase the failure probability of drive systems. Thus, an effective diagnosis method for switch faults in multilevel converters is of high importance for the fault-tolerant...
A new 5-level PFC topology with fault-diagnosis and fault-tolerant capability is proposed and compared to known structures. It is derived from a 3-level non differential double-boost PFC including 2-stacked fly-cap cells. The series-connection of the two low-voltage switching-cells is decoupled by a single flying capacitor that provides a failed-safe tolerant capability increasing the availability...
An active control law for a current fed push-pull converter used in photovoltaic applications is discussed in this paper. The proposed control law aims at avoiding magnetic flux saturation and eliminating the magnetic flux imbalance observed at both windings of the converter transformer. The most prominent advantages of operating without flux saturation are: a more effective magnetic core design;...
The paper presents a novel programmable BICS topology in IBM 65 nm CMOS technology. Programmability, which is the main motivation of this approach, is shown on three different CUTs, simultaneously. It is shown that proposed topology has 473 MHz bandwidth, 200.6ps detection time with 1.5μA sensitivity. Moreover, these specifications are achieved with only one control pin. The advantage on area overhead...
This work considers incipient fault diagnosis and prognosis for hybrid systems with unknown mode changes. A set of augmented analytical redundancy relations (ARRs), termed AARRs, is proposed to extend the capability of ARRs to identify degradation of components which are not represented by physical parameters. The methods utilize the unified constraint relations, named global AARRs (GAARRs), for health...
In this paper the development of protection schemes for multi-phase and phase-to-ground faults in autonomous micro-grids is dealt with, accounting for the fact that a distribution ldquoislandrdquo can be intentionally intended to operate for a long time duration (e.g. during maintenance in the main upstream network or due to economic advantages for the micro-grid electrical customers). The definition...
Polymorphic gates can be considered as a new reconfigurable technology capable of integrating logic functions with sensing in a single compact structure. Polymorphic gates whose logic function can be controlled by the level of the power supply voltage (Vdd) represent a special class of polymorphic gates. A new polymorphic NAND/NOR gate controlled by Vdd is presented. This gate was fabricated and utilized...
Dependability is an important system attribute for microfluidic lab-on-chip devices. On-line testing offers a promising method for detecting defects, fluidic abnormalities, and bioassay malfunctions during chip operation. However, previous techniques for reading test outcomes and analyzing pulse sequences are cumbersome, sensitive to the calibration of capacitive sensors, and error-prone. We present...
With technology scaling, vulnerability to soft errors in random logic is increasing. There is a need for on-line error detection and protection for logic gates even at sea level. The error checker is the key element for an on-line detection mechanism. We compare three different checkers for error detection from the point of view of area, power and false error detection rates. We find that the double...
In this paper we present a low cost fault-tolerant attitude determination system to a scientific satellite using COTS devices. We related our experience in developing the attitude determination system, where we combine proven fault tolerance techniques to protect the whole system composed only by COTS from the effects produced by transient faults. We detailed the failure cases and the detection, reconfiguration...
In this paper, we present a new technique to improve the reliability of H-tree SRAM memories. This technique deals with the SRAM power-bus monitoring by using built-in current sensor (BICS) circuits that detect abnormal current dissipation in the memory power-bus. This abnormal current is the result of a single-event upset (SEU) in the memory and it is generated during the inversion of the state of...
We have proposed a new floating p-well voltage reset scheme for reliable and fast discharging voltage sensing terminal by employing the negative gate bias, which stabilizes the floating p-well voltage spontaneously during the transient state and off-state by turning on the internal PMOS of the floating p-well IGBT. We have investigated the switching stability characteristics of the floating p-well...
The dominant application of electronics today is to process information. The computer industry is the biggest user of semiconductor devices and consumer electronics. Due to the successful development of semiconductors, electronic system and controls have gained wide acceptance in power and computing technology and due to the continuous use of drive systems (rotating machines, controlling thyristors...
This paper examines the effort of solid state switching upon aerospace electric power conditioning equipment. During the past ten years, aerospace solid state switching concepts have undergone laboratory and flight test evaluations to establish the feasibility of the systems approach. This extension of the program to include power conditioning studies reveals several parameters affecting the design...
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