scholarly journals Bidirectional DC–AC Converter-Based Communication Solution for Microgrid

2020 ◽  
Vol 5 (1) ◽  
pp. 177-188
Author(s):  
Yixuan Zhang ◽  
Kai Ni ◽  
Yangang Wang ◽  
Yihua Hu
Keyword(s):  
Power Consumption ◽  
Power Supply ◽  
Data Transmission ◽  
Communication System ◽  
Transmission Rate ◽  
Circuit Structure ◽  
Control Centre ◽  
Power Switches ◽  
Converter Topology ◽  
The Cost

AbstractThe communication system of a microgrid can transfer the information of electricity price, power consumption and so on between users and the control centre. This capability is of great significance to improve the efficiency and sustainability of power facilities. In this paper, a bidirectional DC–AC converter topology is proposed to achieve the composite transmission of power and signals in microgrids. Since the transmitted signals are modulated by power switches of converters and integrated into the currents, the cost of signal couplers can be saved and the circuit structure can be simplified. In order to verify the feasibility of the proposed method, a simulation model of the proposed converter is implemented in MATLAB/Simulink. With the power supply frequency of 50 Hz, when the converter operates in the inverter mode and rectifier mode, the data transmission rate can reach 120 bit/s and 48 bit/s, respectively.

Design of Power Meter Reading Circuit Based on CC2430 and RS485 Bus

2014 ◽  
Vol 608-609 ◽  
pp. 494-498
Author(s):  
Xi You Liu ◽  
Hong Ying Wang
Keyword(s):  
Power Consumption ◽  
Data Transmission ◽  
Communication System ◽  
Hardware Implementation ◽  
Data Communication ◽  
System Model ◽  
Single Chip ◽  
Power Meter ◽  
Reading System ◽  
Reduced Power Consumption

The article analyze current situation of the electric meter reading system, and given circuit of the remote automatic meter reading based on single-chip system model, and introduced in detail the key part of data acquisition, data concentrator and the monitoring center software, hardware implementation. The wiring complexity of the project has been reduced by using the technology of RS485 communication for data transmission, which has been improved the reliability of data communication system, and reduced power consumption. The results show that the terminal is normal and reliable.

A Low Standby Power Consumption Control Circuit for Switching Power Supply

2014 ◽  
Vol 571-572 ◽  
pp. 893-896
Author(s):  
Zhu Lei Shao
Keyword(s):  
Power Consumption ◽  
Power Supply ◽  
Control Circuit ◽  
Switching Power Supply ◽  
Load Detection ◽  
Switching Power ◽  
Detection Circuit ◽  
Power Switches ◽  
Standby Power ◽  
Consumption Control

Aiming at reducing standby power consumption of switching power supply, a low standby power consumption control circuit for switching power supply is designed. The control circuit is composed of power switches, the driving circuit, the load detection circuit and the low power supply circuit. The control circuit effectively closed the input of switching power supply when the switching power supply is without load. The control circuit ensures the normal work of switching power supply when the switching power supply is with load. From the experiment results, the control circuit can effectively reduce standby power consumption of switching power supply.

scholarly journals Novel Reduced Parts Online Uninterruptible Power Supply

2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
Bahram Ashrafi ◽  
Mehdi Niroomand
Keyword(s):  
Power Supply ◽  
Matrix Converter ◽  
Design Consideration ◽  
Excellent Performance ◽  
Uninterruptible Power Supply ◽  
Three Phase ◽  
Power Switches ◽  
Uninterruptible Power ◽  
And Performance ◽  
The Cost

This paper presents design consideration and performance analysis of novel reduced parts online three-phase uninterruptible power supply (UPS) system. The proposed UPS system is based on reduced switch count dual bridge matrix converter. It employs only six power switches and results in reducing the cost of the system compared to conventional online UPS topologies, while achieving excellent performance. The performance of the proposed system is evaluated through simulation in terms of input/output waveforms quality and shows the viability of topology.

The Research and Implementation of USB Communication Interface Circuit Based on FPGA

2012 ◽  
Vol 220-223 ◽  
pp. 2032-2035 ◽  
Author(s):  
Cai Hong Wang ◽  
Guang Feng Jin
Keyword(s):  
Data Transmission ◽  
Communication System ◽  
Transmission Rate ◽  
Transmission System ◽  
Test Results ◽  
Communication Interface ◽  
Interface Circuit ◽  
Usb Communication ◽  
Data Transmission System ◽  
Transmission Speed

This paper puts forward the design of communication system based on FPGA. USB controller CY7C68013 is widely used for its faster data transmission rate and diverse interface way which provide a simple and seamless connecting interface for the ATA, FPGA and DSP . This paper introduces the basic working principles of the controllers, and uses its affiliate FIFO method in order to produce corresponding control signal in FPGA with VHDL. It realizes fast data transmission between PC and FPGA through USB. Test results shows that the scheme transmission speed fast, data accurate, and can be extended to other need through the USB fast data transmission system.

scholarly journals UMTS rapid response real-time seismic networks: implementation and strategies at INGV

2015 ◽  
Vol 41 ◽  
pp. 35-42 ◽  
Author(s):  
A. Govoni ◽  
L. Margheriti ◽  
M. Moretti ◽  
V. Lauciani ◽  
G. Sensale ◽  
...  
Keyword(s):  
Power Consumption ◽  
Real Time ◽  
Power Supply ◽  
Data Transmission ◽  
Seismic Station ◽  
Internet Security ◽  
Service Availability ◽  
Time Data ◽  
The Real ◽  
Real Time Data

Abstract. Universal Mobile Telecommunications System (UMTS) and its evolutions are nowadays the most affordable and widespread data communication infrastructure available almost world wide. Moreover the always growing cellular phone market is pushing the development of new devices with higher performances and lower power consumption. All these characteristics make UMTS really useful for the implementation of an "easy to deploy" temporary real-time seismic station. Despite these remarkable features, there are many drawbacks that must be properly taken in account to effectively transmit the seismic data: Internet security, signal and service availability, power consumption. – Internet security: exposing seismological data services and seismic stations to the Internet is dangerous, attack prone and can lead to downtimes in the services, so we setup a dedicated Virtual Private Network (VPN) service to protect all the connected devices. – Signal and service availability: while for temporary experiment a carefull planning and an accurate site selection can minimize the problem, this is not always the case with rapid response networks. Moreover, as with any other leased line, the availability of the UMTS service during a seismic crisis is basically unpredictable. Nowadays in Italy during a major national emergency a Committee of the Italian Civil Defense ensures unified management and coordination of emergency activities. Inside it the telecom companies are committed to give support to the crisis management improving the standards in their communication networks. – Power consumption: it is at least of the order of that of the seismic station and, being related to data flow and signal quality is largely unpredictable. While the most secure option consists in adding a second independent solar power supply to the seismic station, this is not always a very convenient solution since it doubles the cost and doubles the equipment on site. We found that an acceptable trade-off is to add an inexpensive Low Voltage Disconnect (LVD) circuit to the UMTS router power supply that switches off the data transmission when the power is low. This greatly reduces the probability of data loss but lowers the real-time data availabilty. This approach guarantees on the average a satisfactory data acquistion rate, only in very few cases and when the real-time data is extremely important for a particular site we needed to double the power supply on the site. Overall the UMTS data transmission has been used in most temporary seismic experiments and in all seismic emergencies happened in Italy since 2010 and has proved to be a very cost effective approach with real-time data acquisition rates usually greater than 97 % and all the benefits that result from the fast integration of the temporary data in the National Network monitoring system and in the EIDA data bank.

scholarly journals POWER SUPPLY MANAGEMENT SYSTEM DESIGN ON NODE EARLY WARNING SYSTEM FOR PEATLANDS FIRE MITIGATION

SINERGI ◽  
2018 ◽  
Vol 22 (1) ◽  
pp. 29 ◽  
Author(s):  
Taufiq Muammar ◽  
Rahyul Amri ◽  
Yusnita Rahayu
Keyword(s):  
Power Consumption ◽  
Early Warning ◽  
Power Supply ◽  
Data Transmission ◽  
Early Warning System ◽  
Power Saving ◽  
Warning System ◽  
Emergency Situation ◽  
Sensor Nodes ◽  
Sleep Mode

Early warning system is one of the technology to detect land fires by utilizing a network of wireless sensors. Constant data transmission by the sensor nodes consumes a large amount of energy on the nodes’ sides that could affect the battery’s longevity. This research is done to discover the amount of power consumption and battery longevity during fire emergencies, and during non-emergency situation on peatlands. Power saving on the fire detecting system uses an LM35 temperature sensor, ATmega8 micro-controller and HC-12 transmission module. The overall result of powered by a 9 volt battery during fire emergencies, and during non-emergency, the power consumption reaches up to 1 Wh, with various longevity levels of the battery. The implementation of sleep/wake up mode scheduling during fire emergencies and non-emergencies could save battery for 2 hours compared to those without the power saving mode implementation. Power saving during fire emergency could be minimalized by activating the sleep mode activation power-down on the micro controller and it can also set the data transmission schedule to minimalize data usage during fire emergency, so that the usage of sleep/wake up mode interval scheduling during transmission could minimalize energy consumption and elongate the power supply active period.

Research of Power-On Detection in POE Topology

2014 ◽  
Vol 936 ◽  
pp. 2196-2200
Author(s):  
Zhao Han ◽  
Jie Wu ◽  
Qing Yun Dong ◽  
Ke Ren ◽  
Juan Dong
Keyword(s):  
Theoretical Analysis ◽  
Power Consumption ◽  
Power Supply ◽  
Data Transmission ◽  
Power Transmission ◽  
Experimental Results ◽  
Step Response ◽  
New Approach ◽  
System Power

POE (Power Over Ethernet) realizes the multiplexing of power transmission and data transmission. To ensure the safety of power supply process, PD (Powered Device), when connected, must be detected by PSE (Power Sourcing Equipment). This article describes the methods of PD detection especially in the symmetrical architecture. The symmetrical architecture means that PSE and PD are connected and either of them can play a role of PSE or PD. In our new approach, signature resistance is replaced by signature capacitance. The connection of PD changes the capacitance load of the system, so the step response can be used to detect the change of capacitance load. This method requires zero static current, which reduces the system power consumption. The theoretical analysis, PSPICE simulation and the experimental results are given.

scholarly journals CFD Simulation of a Hyperloop Capsule Inside a Low-Pressure Environment Using an Aerodynamic Compressor as Propulsion and Drag Reduction Method

2021 ◽  
Vol 11 (9) ◽  
pp. 3934
Author(s):  
Federico Lluesma-Rodríguez ◽  
Temoatzin González ◽  
Sergio Hoyas
Keyword(s):  
Shock Waves ◽  
Power Consumption ◽  
High Speed ◽  
Cfd Simulation ◽  
Aerodynamic Drag ◽  
Flow Behavior ◽  
Critical Conditions ◽  
Vehicle Speed ◽  
Blockage Ratio ◽  
The Cost

One of the most restrictive conditions in ground transportation at high speeds is aerodynamic drag. This is even more problematic when running inside a tunnel, where compressible phenomena such as wave propagation, shock waves, or flow blocking can happen. Considering Evacuated-Tube Trains (ETTs) or hyperloops, these effects appear during the whole route, as they always operate in a closed environment. Then, one of the concerns is the size of the tunnel, as it directly affects the cost of the infrastructure. When the tube size decreases with a constant section of the vehicle, the power consumption increases exponentially, as the Kantrowitz limit is surpassed. This can be mitigated when adding a compressor to the vehicle as a means of propulsion. The turbomachinery increases the pressure of part of the air faced by the vehicle, thus delaying the critical conditions on surrounding flow. With tunnels using a blockage ratio of 0.5 or higher, the reported reduction in the power consumption is 70%. Additionally, the induced pressure in front of the capsule became a negligible effect. The analysis of the flow shows that the compressor can remove the shock waves downstream and thus allows operation above the Kantrowitz limit. Actually, for a vehicle speed of 700 km/h, the case without a compressor reaches critical conditions at a blockage ratio of 0.18, which is a tunnel even smaller than those used for High-Speed Rails (0.23). When aerodynamic propulsion is used, sonic Mach numbers are reached above a blockage ratio of 0.5. A direct effect is that cases with turbomachinery can operate in tunnels with blockage ratios even 2.8 times higher than the non-compressor cases, enabling a considerable reduction in the size of the tunnel without affecting the performance. This work, after conducting bibliographic research, presents the geometry, mesh, and setup. Later, results for the flow without compressor are shown. Finally, it is discussed how the addition of the compressor improves the flow behavior and power consumption of the case.

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