scholarly journals A Single-Phase Buck-Boost Matrix Converter with Low Switching Stresses

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
Naveed Ashraf ◽  
Tahir Izhar ◽  
Ghulam Abbas
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Single Phase ◽  
Low Voltage ◽  
Sliding Mode ◽  
Low Frequency ◽  
Matrix Converter ◽  
Power Distribution System ◽  
Selective Approach ◽  
Switching Devices

The suggested single-phase ac-to-ac matrix converter operated with inverting and noninverting characteristics may solve the grid voltage swell and sag problem in power distribution system, respectively. It is also employed as a direct frequency changer for domestic induction heating. The output voltage is regulated through duty cycle control of high frequency direct PWM (DPWM) and indirect PWM (IDPWM) switching devices. The DPWM control switches control the switching states of IDPWM switching devices. The inverting and noninverting characteristics are achieved with low voltage stresses and hence low dv/dt across the high and low frequency-controlled switches. This reduces their voltage rating and losses. The high voltage overshoot problem in frequency step-up operation is also analyzed. The sliding mode (SM) controller is employed to solve this problem. Pulse selective approach determines the power quality of load voltage. The validity of the mathematically computed values is carried out by modelling the proposed topology in MATLAB/Simulink environment and through hardware results.

scholarly journals A Single-Phase Buck and Boost AC-to-AC Converter with Bipolar Voltage Gain: Analysis, Design, and Implementation

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1376 ◽  
Author(s):  
Naveed Ashraf ◽  
Tahir Izhar ◽  
Ghulam Abbas ◽  
Valentina E. Balas ◽  
Marius M. Balas ◽  
...  
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
High Frequency ◽  
Single Phase ◽  
Low Voltage ◽  
Voltage Gain ◽  
Control Effort ◽  
Power Distribution System ◽  
Operating Modes ◽  
Bipolar Voltage

In this research, a new single-phase direct AC-to-AC converter, operating in buck and boost mode, with a bipolar voltage gain, is proposed. The operation is accomplished through high frequency direct and indirect PWM control of a single switch with low voltage stresses. This reduces, not only the control effort, but also the switching losses. The low voltage stresses across the high frequency switches, reduce the dv/dt problem significantly without any loss and bulky voltage snubber arrangement. The operation, in its all-operating modes, has a low inductor ripple current and switching current. The proposed converter may be employed as an AC voltage restorer in a power distribution system to cope with the voltage sag and swell issues. The detailed analysis of the proposed converter is carried out in order to compare its performance with the existing converters. The simulation results obtained using the MATLAB/Simulink environment are verified through experimental results.

scholarly journals Power distribution system fault monitoring device for supply networks in Nigeria

2019 ◽  
Vol 9 (4) ◽  
pp. 2803
Author(s):  
Olalekan Kabiru Kareem ◽  
Aderibigbe Adekitan ◽  
Ayokunle Awelewa
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Distribution System ◽  
Low Voltage ◽  
Copper Wire ◽  
Low Cost ◽  
Monitoring Device ◽  
Power Distribution System ◽  
Fault Monitoring ◽  
Quick Service

Electric power is the bedrock of our modern way of life. In Nigeria, power supply availability, sufficiency and reliability are major operational challenges. At the generation and transmission level, effort is made to ensure status monitoring and fault detection on the power network, but at the distribution level, particularly within domestic consumer communities there are no fault monitoring and detection devices except for HRC fuses at the feeder pillar. Unfortunately, these fuses are sometimes replaced by a copper wire bridge at some locations rendering the system unprotected and creating a great potential for transformer destruction on overload. This study is focused on designing an on-site power system monitoring device to be deployed on selected household entry power cables for detecting and indicating when phase off, low voltage, high voltage, over current, and blown fuse occurs on the building’s incomer line. The fault indication will help in reducing troubleshooting time and also ensure quick service restoration. After design implementation, the test result confirms design accuracy, device functionality and suitability as a low-cost solution to power supply system fault monitoring within local communities.

Shunt Petersen-Coil with Resistor for Single Phase Fault Detection in Resonant Grounded Power Distribution Systems

2013 ◽  
Vol 860-863 ◽  
pp. 2007-2012 ◽  
Author(s):  
Xiao Meng ◽  
Neng Ling Tai ◽  
Yan Hu ◽  
Xia Yang
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Single Phase ◽  
Detection Sensitivity ◽  
Power Distribution Systems ◽  
Power Distribution System ◽  
Multi Level ◽  
The Difference ◽  
Petersen Coil

The failure current in resonant grounder power distribution system is small, so it is difficult to detect the fault feeder. This passage presents the equivalent circuit of resonant grounded system, and discusses the difference of electrical characteristics between faulty feeder and sound feeders by using shunt resistors. To reduce the influence of shunt resistors on the system and improve the detection sensitivity, it presents the method of shunting multi-level resistors, and it proves the sensitivity and reliability of this method by EMTP simulation.

Design of Low-Voltage Power Distribution System

2013 ◽  
Vol 791-793 ◽  
pp. 1889-1891
Author(s):  
Yan Li Fan ◽  
Qing En Li
Keyword(s):  
Power System ◽  
Power Distribution ◽  
Distribution System ◽  
Low Voltage ◽  
Electrical Power ◽  
Scientific Basis ◽  
Voltage Distribution ◽  
Electrical Power System ◽  
Power Distribution System ◽  
High Rise

The low-voltage distribution system is the key component of the electrical power system. Some analysis and research of the low-voltage distribution system is carried out in this paper, which provides some scientific basis to design the low-voltage distribution system. Firstly, the summarize of low-voltage distribution system is taken. The influence to productions and livings of low-voltage distribution system is introduced. Secondly, the mode of connection and design philosophy of low-voltage distribution system is studied in detail, especially the high-rise buildings low-voltage distribution system is concluded and summarized.

Improving Power Quality in Low-Voltage Networks Containing Distributed Energy Resources

2013 ◽  
Vol 14 (1) ◽  
pp. 67-78 ◽  
Author(s):  
Sumit Mazumder ◽  
Arindam Ghosh ◽  
Firuz Zare
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution System ◽  
Low Voltage ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Distributed Energy ◽  
Power Distribution System ◽  
Computer Simulation Studies ◽  
Excess Power

Abstract Severe power quality problems can arise when a large number of single-phase distributed energy resources (DERs) are connected to a low-voltage power distribution system. Due to the random location and size of DERs, it may so happen that a particular phase generates excess power than its load demand. In such an event, the excess power will be fed back to the distribution substation and will eventually find its way to the transmission network, causing undesirable voltage–current unbalance. As a solution to this problem, the article proposes the use of a distribution static compensator (DSTATCOM), which regulates voltage at the point of common coupling (PCC), thereby ensuring balanced current flow from and to the distribution substation. Additionally, this device can also support the distribution network in the absence of the utility connection, making the distribution system work as a microgrid. The proposals are validated through extensive digital computer simulation studies using PSCADTM.

AGC Control of Scheduling with Distributing Power Generation and Performance Study

2012 ◽  
Vol 220-223 ◽  
pp. 101-106
Author(s):  
Xing Wan ◽  
Xiao Li Zhang
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Low Voltage ◽  
Performance Study ◽  
Power Distribution System ◽  
Power Resources ◽  
Distributed Generators ◽  
Load Demand ◽  
Micro Grid ◽  
And Performance

Abstract: Scheduling plans of running a large, traditional power grid often distribute power resources in each small system. And they didn’t take the scope of scheduling operation within the power distribution system into consideration. With the trend separate transmission and distribution, the number of distributed generators that installed is growing rapidly. More and more micro-grid network composed of low-voltage distribution power network are formed. With effective regulation, this system can satisfy local load demand and support networking. The establishment of mechanisms such as AGC support services, with be vital to insure the power quality and reliability. Keywords: distributing power Micro-Grid DG AGC

scholarly journals ANALISIS DROP TEGANGAN PADA JARINGAN TEGANGAN MENENGAH DENGAN MENGGUNAKAN SIMULASI PROGRAM ETAP

2019 ◽  
Vol 10 (1) ◽  
pp. 26-37
Author(s):  
Redaksi Tim Jurnal
Keyword(s):  
Electric Power ◽  
Power Distribution ◽  
Distribution System ◽  
Low Voltage ◽  
Voltage Drop ◽  
Power Distribution System ◽  
Medium Voltage ◽  
Cable Channel ◽  
Electric Power Distribution ◽  
Manual Calculation

Distribution system is very important in the distribution of electric power to the load. Therefore, a good and efficient distribution system is needed. The underlying cause of poor electric power distribution system is the amount of voltage drop values in the existing system. In the electric power distribution, 20 kV medium-voltage and 380/220V low voltage networks are used. The distribution system of Gandum Feeder in Angke Substation uses medium-voltage network with Underground Cable channel. They are used because of the towering buildings and the dense population in the area. It is known that the longest the channel and the load current are, the greater the voltage drop. From the result of the voltage drop calculation of Feeder Gandum in Angke Substation, which uses manual calculation and ETAP 12.6.0 program, it showed a slight difference in the result. The result of the voltage drop obtained from manual calculation showed that the percentage value of voltage is 1,94%, while the result obtained from ETAP 12.6.0 program showed that the percentage value is 2,01% These results are still in the PLN standard, because it has not exceeded the specified standard that is -10% of its nominal voltage.

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