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Updates found with 'stations'

IEEE 2016 JAVA PROJECTS ABSTRACTOPTIMAL USER-CELL ASSOCIATION FOR MASSIVE MIMO WIRELESS NETWORKS ABSTRACT: Massive MIMO is one of the most promising approaches for coping with the predicted wireless data traffic explosion. Future deployment scenarios will involve dense heterogeneous networks, comprised of massive MIMO base stations with different powers, numbers of antennas and multiplexing gain capabilities, and possibly highly non-homogeneous user density (hot-spots). In such dense irregularly deployed networks, it will be important to have mechanisms for associating users to base stations so that the available wireless infrastructure is efficiently used. In this paper, we consider the optimal user-cell association problem for massive MIMO heterogeneous networks and illustrate how massive MIMO can also provide non-trivial advantages at the system level. Unlike previous treatments that rely on integer program problem formulations and their convex relaxations, the user-cell association problem is formulated directly as a convex network utility maximization and solved efficiently by a centralized sub-gradient algorithm. As we show, the globally optimal solution is physically realizable, in that there exists a sequence of integer-valued associations approaching arbitrarily closely the optimal fractional association. We also consider simple decentralized user-centric association schemes, where each user individually and selfishly connects to the base station with the highest promised throughput. Such user-centric schemes where users make local association decisions in probabilistic manner can be viewed as games and are known to converge to Nash equilibria. Surprisingly, as we show, under certain conditions, the globally optimal solution is close to these Nash equilibria. Such decentralized approaches are there fore attractive not only for their simplicity, but also because they operate near the system social optimum. Our theoretical results are confirmed by extensive simulations with realistic LTE-likenetwork parameters.
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EEE 2016 POWER ELECTRONICS ABSTRACT:POSITION SENSORLESS CONTROL WITHOUT PHASE SHIFTER FOR HIGH-SPEED BLDC MOTORS WITH LOW INDUCTANCE AND NONIDEAL BACK EMF ABSTRACT: As the key actuator for the attitude control of space stations and satellites, a magnetically suspended control moment gyro (MSCMG) has the character of high precision, large moment, and long life owing to the zero friction and enhanced damping of a high-speed rotor. The high-speed motor of an MSCMG is usually operating at a constant high speed to supply the demanded angular momentum for the high-speed rotor system. For space application, high reliability and low power loss are demanded in the high-speed motor. Brushless DC (BLDC) motors with ironless and slotless stator are introduced. EXISTING SYSTEMS: The phase back electromotive force (EMF) zero-crossing points (ZCPs) detection method is widely used in the position sensorless control. The ZCPs detection of phase voltages is accomplished using the motor neutral voltage. The virtual neutral point is adopted for the motor in which the neutral point voltage cannot be easily achieved. The ideal commutation instants which are the ZCPs of the line-to-line back EMF voltages delayed to the ZCPs of the phase back EMF voltages by 30 electrical degrees. The calculation of the commutation instants should take the phase delay of the low-pass filter (LPF) and the motor velocity into account especially in the high speed region. A phase shifter which can shift the detected ZCP signals with a specific angle is proposed by implementing on a microcomputer. The compensated phase is calculated in real time. This kind of method needs hardware or software resource that may lead to computational errors. The research adopts a coordinate transformation method to compensate the rotor position detection error by controlling the angle between two coordinates in real time. The method is suitable for the wide speed range. The method using the integration of the unconducting phase back EMF voltage is presented. However, the error accumulation problem in the low-speed region should be taken into account. The sensorless control method based on the phased-lock loop and the third-harmonic back EMF is proposed. PROPOSED SYSTEM: An improved position sensorless control method for the high-speed BLDC motor with low inductance and nonideal back EMF is proposed. Based on the analysis of the position detection error of the traditional line voltage detection method, a two-stage commutation error compensation method using virtual neutral point without complicated software algorithm is proposed. The transformative line voltages and hysteresis comparators are adopted to achieve high precision commutation in the medium- and high-speed region. Meanwhile, LPFs and the transformative line voltages are adopted to achieve high reliable commutation in the low-speed region. The parameter design of the proposed method is presented in detail. The effect of the nonideal back EMF voltage is eliminated by the characteristic parameters measured in the offline mode. The proposed method can directly generate commutation signals replacing Hall signals and achieve high reliable and high accurate commutation without phase shift measures in the whole operating speed region of the back EMF-based sensorless control process. ADVANTAGES:• High precision commutation in the medium- and high-speed region.• High reliable commutation in the low-speed region• Effect of the nonideal back emf voltage is eliminated by the characteristic parameters measured in the offline mode.APPLICATIONS:• Space stations and satellites.
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POWER ELECTRONICS ABSTRACT 2016-2017 EFFECTIVE VOLTAGE BALANCE CONTROL FOR BIPOLAR-DC-BUS FED EV CHARGING STATION WITH THREE-LEVEL DC-DC FAST CHARGER The development of high-power charging stations with fast chargers is a promising solution to shorten the charging time for electric vehicles (EVs). The neutral-point-clamped (NPC) converter based bipolar-dc-bus fed charging station brings manymer its, but it has inherent voltage balance limits. To solve this issue, a voltage balance control (VBC) method based on a new modulation together with three-level (TL) dc-dc converter based fast charger is proposed. Additionally, an effective VBC coordination between the TL dc-dc converter and NPC converter is formulated. Through the proposed VBC coordination, the controllable balancing region is extended so that additional balancing circuits are eliminated. Meanwhile, the grid-side currents quality is improved as the NPC converter has more free Dom to control currents. The low-frequency voltage fluctuations in dcbuses are removed because the TL dc-dc converter performs most of the balancing tasks. Faster VBC perturbation performance is achieved due to higher available balancing current at TL dc-dc converter side. In addition, the voltage balance limits of both the TL dc-dc converter and the NPC converter are explored. The voltage balancing performances are compared when VBC is located at different sides. Simulation and experimental results are provided to verify the proposed VBC and the VBC coordination.
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NS2 PROJECTS ABSTRACT 2016-2017 A NOVEL APPROACH FOR IMPROVED VEHICULAR POSITIONING USING COOPERATIVE MAP MATCHING AND DYNAMIC BASE STATION DGPS CONCEPT ABSTRACT: In this paper, a novel approach for improving vehicular positioning is presented. This method is based on the cooperation of the vehicles by communicating their measured information about their position. This method consists of two steps. In the first step, we introduce our cooperative map matching method. This map matching method uses the V2V communication in a vehicular ad hoc network (VANET) to exchange global positioning system (GPS) information between vehicles. Having a precise road map, vehicles can apply the road constraints of other vehicles in their own map matching process and acquire a significant improvement in their positioning. After that, we have proposed the concept of a dynamic base station DGPS (DDGPS), which is used by vehicles in the second step to generate and broadcast the GPS pseudo range corrections that can be used by newly arrived vehicles to improve their positioning. The DDGPS is a decentralized cooperative method that aims to improve the GPS positioning by estimating and compensating the common error in GPS pseudo range measurements. It can be seen as an extension of DGPS where the base stations are not necessarily static with an exact known position. In the DDGPS method, the pseudo range corrections are estimated based on the receiver’s belief on its positioning and its uncertainty and then broadcasted to other GPS receivers. The performance of the proposed algorithm has been verified with simulations in several realistic scenarios.
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IEEE 2016 MAT LAB PROJECTS ABSTRACTOPTIMIZED LTE CELL PLANNING WITH VARYING SPATIAL AND TEMPORAL USER DENSITIES ABSTRACT: Base station deployment in cellular networks is one of the fundamental problems in network design. This paper proposes a novel method for the cell planning problem for the fourth generation (4G) cellular networks using meta-heuristic algorithms. In this approach, we aim to satisfy both cell coverage and capacity constraints simultaneously by formulating an optimization problem that captures practical planning aspects. The starting point of the planning process is defined through a dimensioning exercise that captures both coverage and capacity constraints. Afterwards, we implement a meta-heuristic algorithm based on swarm intelligence (e.g., particle swarm optimization or the recently-proposed grey wolf optimizer) to find suboptimal base station locations that satisfy both problem constraints in the area of interest which can be divided into several subareas with different spatial user densities. Subsequently, an iterative approach is executed to eliminate eventual redundant base stations. We also perform Monte Carlo simulations to study the performance of the proposed scheme and compute the average number of users in outage. Next, the problems of green planning with regards to temporal traffic variation and planning with location constraints due to tight limits on electromagnetic radiations are addressed, using the proposed method. Finally, in our simulation results, we apply our proposed approach for different scenarios with different subareas and user distributions and show that the desired network quality of service targets are always reached even for large-scale problems.
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IEEE 2016 POWER SYSTEM ABSTRACT: REACTIVE POWER AND AC VOLTAGE CONTROL OF LCC HVDC SYSTEM WITH CONTROLLABLE CAPACITORS ABSTRACT: Traditional Line-Commutated Converter (LCC) based High Voltage Direct Current (HVDC) technology has played an important role in long distance bulk power transmission around the world since its first application 60 years ago. However some well-known limitations associated with it still exist today which to a certain extent limit further applications of such a technology. One of the limitations is significant reactive power requirement at both sides of the HVDC system. The reactive power requirement originates from the firing of thyristors after commutation voltage becomes positive, which in effect delayed the current waveforms with respect to the voltage waveforms. EXISTING SYSTEM: In this case since the two converter stations are located on the same site, the problems of communication delay and the risk of loss of communications between rectifier and inverter control systems are minimized. Also the measurements from both terminals are readily available for both control systems. Hence it is possible for the inverter to control its reactive power consumption by varying its extinction angle while the danger of losing commutation margin can be mitigated by the rectifier controller modifying its operating conditions. This type of control helps improve the AC voltage stability at the inverter bus by controlling reactive power consumption, but considerable steady state reactive power consumption still remains. In addition this type of control strategy is limited to back-to-back HVDC schemes. For point to point HVDC schemes, unlike back-to-back schemes, the communication delay and/or the requirements for the system to operate without communications largely limit the possibility of reactive power control. Most of the literatures are then focused on reactive power compensation rather than reducing reactive consumption level of converter. PROPOSED SYSTEM: The LCC HVDC system with controllable capacitors and the connected AC system at the inverter side. In the figure, TY1-TY6 and TD1-TD6 are thyristor valves, CapYa, CapYb, CapYc and CapDa, CapDb, CapDc are capacitor modules, S1Ya-S4Ya are four Insulated Gate Bipolar Transistor (IGBT) switches for capacitor module CapYa. An induction machine is added to the inverter AC bus to test the AC voltage controller performance. Capacitor modules are connected in series between the secondary side of converter transformers and thyristor valves. Each capacitor module can be realized by a single module (as that for 2-level VSC) or by a number of series connected sub-modules to achieve higher insertion voltage. Each module consists of four IGBT switches with anti-parallel diode across each one of them. The reference polarity of the capacitor is shown in Figure. Each capacitor module will be inserted as a positive voltage when S1 and S4 are switched on and S2 and S3 are switched off, and will be inserted as a negative voltage when S2 and S3 are switched on and S1 and S4 are switched off. Bypass is achieved by switching S1 and S3 on or S2 and S4 on at the same time.ADVANTAGES:• An induction machine is added to the inverter AC bus to test the AC voltage controller performance.• Commutation voltage from the inserted capacitors guarantees the successful commutations when inverter is exporting reactive power.DISADVANTAGES:• Significant reactive power requirement at both sides of the HVDC system.• Due to no voltage control the large AC disturbances in the system.APPLICATIONS:• Bulk power transmission applications.
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IEEE 2016-2017 EMBEDDED PROJECTS ABSTRACTTHE DESIGN OF BUILDING FIRE MONITORING SYSTEM BASED ON ZIGBEE-WIFI NETWORKS ABSTRACT:- With the rapid development of wireless communication technology, people's life has undergone great changes. In recent years, the comfort and safety of the building environment have become a universal concern. However, building fire is the greatest threat to building safety. In consideration of the current issues on building security, the design applies the important part, the wireless sensor network technology to building fire safety monitoring system and establishes the wireless sensor network by using ZigBee technology and ZigBee-WiFi gateway which transforms ZigBee network into WiFi network, In addition, taking advantage of the ZigBee wireless sensor network locates a fire place so that the fire information is uploaded to the handheld terminal and the building security personnel work out the retreat and rescue plan in time. This paper provides a new solution for building fire monitoring system. EXISTING SYSTEM:- Modern building fire safety system mainly focuses on wireless sensor networks fire alarm. However, the monitoring center can't take effective evacuation and guidance in time. When the fire occurs, it is particularly important for people in danger to escape quicklyPROPOSED SYSTEM:- The proposed system consists of micro controller which interfaced with sensors and ZigBee module. The sensor values are converted and verified for any abnormal values. If found the values are sent to the ZigBee-WiFi module through ZigBee. In the ZigBee-WiFi module the controller gets the sensors value and transfers it to the WiFi module to the wireless gateway inorder to reach the monitoring centre. ADVANTAGES:- These methods are effective to detect fire with in a fraction of second. This development will certainly help to utilize the data collected in various networks or applications in a smart system and provide safer environment to live. DISADVANTAGE:- It achieves wireless technology with limited options of connecting to particular devices only. It does not connect with the centralized monitor station to prepare for quick evacuation.CONCLUSION:- This paper focuses on the issue on building fire monitoring, combined with thought of wireless sensor network technology, and comes up with a ZigBee-based wireless sensor network to collect the information from the entire building, and making use of ZigBee nodes to locate the fire stations. Taking full advantages of WiFi and ZigBee, this design builds a ZigBee-WiFi network. The purpose is to design a real-time building fire monitoring system which is more facilitative to contact with the personal handy terminal and has wider covering range.
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IEEE 2016-2017 EMBEDDED PROJECTS ABSTRACTVOICE-ACTIVITY HOME CARE SYSTEM ABSTRACT:- With the rapid development of wireless communication technology, people's life has undergone great changes. In recent years, the comfort and safety of the building environment have become a universal concern. However, building fire is the greatest threat to building safety. In consideration of the current issues on building security, the design applies the important part, the wireless sensor network technology to building fire safety monitoring system and establishes the wireless sensor network by using ZigBee technology and ZigBee-WiFi gateway which transforms ZigBee network into WiFi network, In addition, taking advantage of the ZigBee wireless sensor network locates a fire place so that the fire information is uploaded to the handheld terminal and the building security personnel work out the retreat and rescue plan in time. This paper provides a new solution for building fire monitoring system. EXISTING SYSTEM:- Modern building fire safety system mainly focuses on wireless sensor networks fire alarm. However, the monitoring center can't take effective evacuation and guidance in time. When the fire occurs, it is particularly important for people in danger to escape quicklyPROPOSED SYSTEM:- The proposed system consists of micro controller which interfaced with sensors and ZigBee module. The sensor values are converted and verified for any abnormal values. If found the values are sent to the ZigBee-WiFi module through ZigBee. In the ZigBee-WiFi module the controller gets the sensors value and transfers it to the WiFi module to the wireless gateway inorder to reach the monitoring centre. ADVANTAGES:- These methods are effective to detect fire with in a fraction of second. This development will certainly help to utilize the data collected in various networks or applications in a smart system and provide safer environment to live. DISADVANTAGES:- It achieves wireless technology with limited options of connecting to particular devices only. It does not connect with the centralized monitor station to prepare for quick evacuation.CONCLUSION:- This paper focuses on the issue on building fire monitoring, combined with thought of wireless sensor network technology, and comes up with a ZigBee-based wireless sensor network to collect the information from the entire building, and making use of ZigBee nodes to locate the fire stations. Taking full advantages of WiFi and ZigBee, this design builds a ZigBee-WiFi network. The purpose is to design a real-time building fire monitoring system which is more facilitative to contact with the personal handy terminal and has wider covering range.
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