A new topology with fault-tolerant ability that improves the reliability of multilevel converters is proposed. This developed through analysis different power device's failure modes. With proposed scheme, function stage can be maintained even part it fails. Its results from redundant nature multiswitching-state and control signal modification. Furthermore, balances voltage levels automatically without any assistance other circuits. The validity scheme confirmed by experiments in a five-level...

Power converters are known to be generators of harmonics on both their AC and DC sides. They also transfer existing from one side the other with an associated change frequency. Analysis techniques that can used calculate these transferred using amplitude modulation (AM) theory proposed. The authors show how, in a high-voltage direct-current (HVDC) link, intercouple systems thus act as medium for harmonics. Examples how given comparisons made computer-aided design (CAD) model check accuracy...

Physical layer key generation (PKG) is a promising means to provide on-the-fly shared secret keys by exploiting the intrinsic randomness of radio channel. However, performance PKG highly dependent on propagation environments. Due its feature controlling wireless environment, reconfigurable intelligent surface (RIS) appealing be applied in PKG. In this article, contrast existing literature, we investigate both constructive and destructive effects RIS scheme. For aspect, have identified static...

This paper focuses on the fault-tolerance potential of multilevel inverters with redundant switching states such as cascaded and capacitor self-voltage balancing inverters. The failure situations are classified into two types according to relationship between output voltage levels states. gate signals can be reconfigured modes when some power devices fail. reconfiguration method is discussed for phase disposition PWM strategy (PDPWM) shifted (PSPWM) in it extended other carrier-based...

Reconfigurable intelligent surface (RIS) is a disruptive technology to enhance the performance of physical-layer key generation (PKG) thanks its ability smartly customize radio environments. Existing RIS-assisted PKG methods are mainly based on idealistic assumption an independent and identically distributed (i.i.d.) channel model at both base station (BS) RIS. However, i.i.d. inaccurate for typical RIS in isotropic scattering environment neglecting existence spatial correlation would...

This paper describes the study of reliability capacitor units installed and operated in a distribution system during period 1980 through 1990. Failures substations can be very costly to supply reliable power consumers. To enhance utility reliability, failure analysis rates, origin physical damage causes were performed for these units. Two approaches, statistical physical, utilized this study. In area, modes, levels are analyzed. The mainly deals with mechanism deterioration composite...

When HVDC schemes are used to join AC systems of different frequencies, frequencies other than the well known characteristic harmonics produced in systems, and these often called interharmonics. This paper examines interharmonics shows that, for with low DC side reactance, another set will exist only on side. These a function impedance convertor seen from It is shown that this time varying and, by modulation theory, produce harmonic some which may be at frequency. also amplitudes changed...

A new topology with fault tolerant ability is proposed to improve the reliability of multilevel converters, which based on analysis different power devices failure modes. With scheme, function stage can be maintained even part it fails. The resulted from inherent redundant nature multiswitching-states and control signals modification. Further more, balances voltage levels automatically except for achieving fault-tolerance. validity scheme confirmed by experiments in a five-level inverter prototype.

The difference between traditional IT network and industrial control determines the different methods of security assessment. In face increasingly serious cybersecurity status, assessment research faces new challenges. This paper compares composition, function possible damage network, discusses existing standards key technologies related to It analyzes challenges faced by two networks looks forward future research.

Automatic ship detection from optical satellite images remains a tough task. In this paper, novel method of satellites is proposed by analyzing the distribution probability. First, an anomaly model constructed sea cluster histogram model; then, based on safety navigational criterion analyzed to obtain candidates, and obvious non-ship objects are removed area properties candidates; finally, structural continuity descriptor designed remove false alarms candidates. Experiments numerous...

AC side current harmonics in an HVDC system are shown to be dependent on the commutation overlap and DC ripple. Interharmonics exist when networks operate at different frequencies. An analytical method is proposed represent such effects harmonic calculation. The algorithm does not require iteration between sides. result obtained using verified time domain simulation.

Least square support vector regression (LSSVR) is a method for function approximation, whose solutions are typically non-sparse, which limits its application especially in some occasions of fast prediction.In this paper, sparse algorithm adaptive pruning LSSVR based on global representative point ranking (GRPR-AP-LSSVR) proposed.At first, the (GRPR) given, and relevant data analysis experiment implemented depicts importance points.Furthermore, strategy removing two samples decremental...

Physical-layer key generation (PKG) exploits the reciprocity and randomness of wireless channels to generate a symmetric between two legitimate communication ends. However, in multi-cell systems, PKG suffers from severe pilot contamination due reuse pilots different cells. In this paper, we invoke multiple reconfigurable intelligent surfaces (RISs) for adaptively shaping environment enhancing performance. To end, formulate an optimization problem maximize weighted sum rate (WSKR) by jointly...

Due to the capability of controlling wireless environments, reconfigurable intelligent surface (RIS) can be exploited assist radio channel-based physical-layer key generation (PKG). However, this may also pose great security threats PKG when it is controlled by an attacker. To end, letter studies a RIS leakage (RISL) attack that assists attacker manipulate generated keys between legitimate ends in systems. Specifically, block fading alternatingly adapting reflection coefficients all 0s and...

A new topology of interleaved three-level boost converter is proposed in this paper. By using topology, an overall reduction the inductor size as well low boost-rectifier reverse-recovery loss can be achieved, and voltage device used high power applications.

A new method that can be used in the calculation of characteristic harmonic components generated by a converter system is described. This based on modulation theory and an AC side equivalent circuit for derived. The effects commutation overlaps impedance are correctly represented providing overlap angles known. Using this method, entire performed at converter, thus substantially simplifying analysis process. particularly useful when information DC link not needed. understanding into...

This paper describes the study of reliability capacitor units installed and operated in a distribution system during period 1980 through 1990. Failures substations can be detrimental to supply reliable power consumers. To enhance utility reliability, failure analysis rates, origin physical damage causes were studied for these units. Two approaches, statistical physical, utilized this study. In area, modes, levels are analyzed. The mainly deals with mechanism deterioration composite...

Converters built with integrated modules have many advantages such as increased power density, flexible distributed control, multi-functionality, reliability and short design cycles. However, the system performance will be affected due to synchronization errors among each modules. This paper analyzes impact of two kinds on whole performance, well detailed implementation. Meanwhile, some valuable conclusions are derived from theoretical analysis, simulations experimental results