This paper proposes a dual-space vector control scheme for the open-end winding permanent magnet synchronous motor (OEW-PMSM) drive fed by dual inverter with single dc supply. Potential zero-sequence current in system has to be considered since it causes circulating and leads high stress of power semiconductor devices losses. Zero-sequence ac drives is usually caused voltage, therefore switching combinations which do not produce voltage are used synthesize reference existing methods. But...

As a development direction of urban rail transit system, the train autonomous circumambulate system (TACS) can operate in safer, more efficient, and economical mode. However, most systems transmit signals through industrial, scientific, medical (ISM) frequency bands or narrow bands, which cannot meet requirements TACS. promising solution, 5th generation (5G) mobile communication provides services for future systems, covers shortages exiting technologies terms capacity reliability. In this...

5G radio access networks are expected to provide very high capacity, ultra-reliability and low latency, seamless mobility, ubiquitous end-user experience anywhere anytime. Driven by such stringent service requirements coupled with the dense deployments diverse use case scenarios, architecture of New Radio (NR) wireless has further evolved from traditionally cell-centric a more flexible beam-based user-centric access. This article provides an overview NR system multi-beam operation in terms...

The application of train-to-train (T2T) communication in urban rail transit is expected to simplify system structure, reduce maintenance costs, and improve operational efficiency. In particular, train-to-wayside (T2W) coexist with T2T the train control based on communication. To make full use limited spectrum resources, frequency reuse adopted as an efficient technique, but it brings co-channel interference unfortunately, which affects quality service (QoS) for T2W users. this paper, we...

Train-to-train (T2T) communication is expected to increase efficiency of train operation and reduce life-cycle cost in construction for the urban rail transit system. In this paper, we adopt millimeter wave (mmWave) band achieve T2T focus on alignment problem narrow beams between trains turning scene. We first investigate beam coherence time related a number antennas speed avoid misalignment problems then propose location-assisted method obtain analog beamforming combining vectors by...

Multi-cell processing (MCP) is regarded as an effective way for interference mitigation in cellular networks. We propose a joint Base Station (BS) selection and linear precoding design algorithm the downlink transmission MCP enabled The solves regularized utility maximization problem to find sparse solution matrix. BS thus based on sparsity pattern of resulted With design, proposed rigorously takes into account optimizes effect overall system performance. total power minimization target...

Aiming at the problems of promoting new energy consumption, reducing carbon emissions, load fluctuations, and multi-agent conflict interests in networked microgrid system, this article proposes a optimization operation strategy based on demand response reward-penalty ladder-type trading mechanism. First, order to determine electricity sales price an optimal scheduling model for operators is established, including gas cost, profit users, surplus power supply network profit. Second, low-carbon...

The simplest Alamouti space-time block code is coupled with a larger number of transmit antennas via ideal beamforming to achieve higher diversity gain. It shown that the combined system can remain both full and rate without orthogonality loss. Simulation results show significant performance gain over conventional codes.

In this paper, we present the recent progress of evaluation multi Si PERCT technology in an industrial pilot production Chinese cell manufacturer Lu'an. Our is alternative to AlOx based PERC for improving multi-crystalline solar efficiencies above 18.5% and it on standard mass equipment wafer quality. An additional unique feature manufacture bifacial cells with screen-printed finger grid rear side instead a full area Al-BSF. The architecture "passivated emitter totally diffused (PERT)"...

At present, the proportion of new energy sources such as wind power and photovoltaic in system is gradually increasing, flexibility has become one important evaluation criteria for safe stable operation current future systems. As a measure its ability to respond uncertain events, reasonable quantification analysis system's prerequisite. This paper, quantified under two time scales 15min 1h, then indicators are proposed ramp gap peak-shaving gap. Finally, according actual data regional grid,...

Single carrier frequency division multiple access (SCFDMA) has been adopted as a possible air interface for future wireless networks it combines the advantages of Orthogonal Frequency Division Multiple Access (OFDMA) and low envelope variation properties single (SC) transmission. The classical transmit antenna diversity technique Space-Frequency Block Coding (SFBC) will harm single-carrier property thus enhance power amplifier efficiency mobile terminal. To solve this problem, modified...

This paper studies the problems of minimizing power dissipation an interconnect wire by simultaneously considering buffer insertion/sizing and sizing (BISWS). We consider two cases, namely with optimal delay constraints, a given penalty. derive closed form solutions for both cases. These can be used to efficiently estimate in early stages VLSI designs. observe that much different even same delay.

This paper addresses the development of high voltage direct current High-Speed Switch (HSS) for multi-terminal DC transmission systems. The performance HSS significantly affects power capability and operational flexibility these To enhance ±800 kV products, this discusses key technologies related to insulation, no-load charging breaking, arc withstand. presents latest research results using simulation experimental methods. findings contribute improving continuity safe stable operation

The performance of a double closed-loop vector control system for permanent magnet synchronous motor (PMSM) relies on the accurate estimation rotor positions or speed. extended Kalman filter (EKF) algorithm is used estimating speed in this paper. Aiming at problems traditional EKF method such as time-consuming computation covariance matrices, poor robustness, and low precision when load torque disturbances exist, genetic (GA) to optimize selection process parameters. Also, state observer...

Although perfect quantum network coding has been proved to be achievable, it is still puzzling whether feasible whenever one or more of the channels are replaced by hidden ones emerging from entanglement. The question answered in this paper. First, we propose a protocol over butterfly with two channels. Second, investigate general situation, where d-level letters transmitted through containing arbitrarily distributed channels, and prove that on such networks achievable.

We propose a linear precoding technique, called multiuser generalized eigenmode transmission (MGET), based on the leakage-based technique. A signal-to-leakage-plus-noise (SLNR) scheme is one approach for in multiple-input multiple-output broadcast channel that sends multiple data streams to different users same cell. Unfortunately, SLNR-based neglects other-cell interference, which limits performance of at edge MGET addresses shortcomings previous beamformers by transmitting each user or...

The power line communication detection device is the core equipment of low-carbon building energy Internet. Although carrier (HPLC) adopted by it has a fast transmission speed, its path search signaling reliability low, which seriously restricts performance relay. two-way automatic system (TWACS) high reliability, but speed slow, affects timeliness communication. In order to improve coverage and in Internet information perception, an improved multi-mode fusion algorithm based on HPLC TWACS...

Carrier frequency offset estimation and adjustment is essential to wireless communication receiver. Scanning receiver both a measurement instrument, carrier affects performance accuracy. In this paper, we introduced phase based algorithm for estimation, experiments analysis were also given verify its effectivity limitations. To compensate the drawback of significantly improve accuracy, GPS was proposed in paper.

The rapid development of electric vehicles, in addition to strengthening technical research, improve battery life, convenient charging facilities is very necessary. At present, for vehicle users, the biggest obstacle install piles residential parking spaces from property, and property companies generally refuse safety reasons. In this paper, a new solution proposed replace original fixed pile into movable form. separated foundation connected with screw lock head. connection adopts form air...

This work investigates the open-loop transmit antenna selection (OL-TAS) modes in uplink of long term evolution (LTE) 3G standard. The subframe is composed two slots based on single-carrier frequency-division multiple access (SC-FDMA) system. conventional OL-TAS mode switches antennas alternatively for every slot. A non-neglectable performance loss resulted from hardware switch antennas. To reduce number switches, a special proposed this LTE uplink, where only performed middle subframe. Thus...

Potential lack of witness and monitoring equipments make timely accident rescue a challenge after vehicle collision happens. It is necessary to deploy onboard sensors achieve the real-time detection for collisions. However, how accurately detect collisions by filtering fluctuate data from near engine remains problem. In this paper, we take first step conduct an experiment gather labeled 2,700 Then, detecting scheme based on linear discriminant analysis (VCD-LDA) in big enabled vehicular...

The existing research results show that in the network configuration section WC can get close to performance of whole wavelength conversion network.The design optical backbone should not only satisfy service, but also consider further involved service electric power system.Partial capability sparse is temporarily an intermediate form during evolution system communication system.This paper mainly studied and routing algorithm assignment, we have proposed a new multi-layer assignment by using...

The simplest Alamouti's space-time block code is coupled with a larger number of transmit antennas via ideal beam-forming to achieve higher diversity gain compared the conventional Alamouti scheme only two antennas. An exact union bound on bit error rate (BER) derived for combined system beamforming and based calculation pairwise probability (PEP) same system. To calculate PEP, Gauss-Chebyshev quadrature rule moment-generating function (MGF) approach adopted. analysis carried out slow...