New trends in converter topologies and control methods for active power distribution grids

2013 ◽  
Keyword(s):  
Power Distribution ◽  
Active Power ◽  
Control Methods ◽  
Converter Topologies ◽  
And Control ◽  
Distribution Grids

scholarly journals A comprehensive review of distributed power system architecture for telecom and datacenter applications

2021 ◽  
Vol 12 (3) ◽  
pp. 1535
Author(s):  
Ramesh B. Darla ◽  
Chitra A
Keyword(s):  
Power Distribution ◽  
Power Conversion ◽  
Power Losses ◽  
Voltage Level ◽  
Information And Communication ◽  
Converter Topologies ◽  
Dc Bus ◽  
Bus Voltage ◽  
And Control ◽  
Bus Architecture

With the dominating utility of the internet, it becomes critical to manage the efficiency and reliability of telecom and datacenter, as the power consumption of the involved equipment also increases. Much power being wasted through the power conversion stages by converting AC voltage to DC voltage and then stepping down to lower voltages to connect to information and communication technology (ICT) equipment. 48/12 VDC is the standard DC bus architecture to serve the end utility equipment. This voltage level is further processed to multiple lower voltages to power up the internal auxiliary circuits. Power losses are involved when it is converted from higher voltage to lower voltages. Therefore, the efficiency of power conversion is lower. There is a need to increase the efficiency by minimizing the power losses which occur due to the conversion stages. Different methods are available to increase the efficiency of a system by optimizing the converter topologies, semiconductor materials and control methods. There is another possibility of increasing the efficiency by changing the architecture of a system by increasing the DC bus voltage to higher voltages to optimize the losses. This paper presents a review of available high voltage options for telecom power distribution and developments, implementations and challenges across the world.

scholarly journals Adaptive Monitoring and Control Architectures for Power Distribution Grids over Heterogeneous ICT Networks

2015 ◽  
Vol 1 (2) ◽  
pp. 151-180
Author(s):  
Rasmus L. Olsen ◽  
Christian H¨agerling ◽  
Fabian M. Kurtz ◽  
Florin Iov ◽  
Christian Wietfeld ◽  
...  
Keyword(s):  
Power Distribution ◽  
Monitoring And Control ◽  
Adaptive Monitoring ◽  
And Control ◽  
Distribution Grids

Overview of multi-phase switched reluctance motor drives for electric vehicles

2021 ◽  
Vol 13 (9) ◽  
pp. 168781402110451
Author(s):  
Shouyi Han ◽  
Kaikai Diao ◽  
Xiaodong Sun
Keyword(s):  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Torque Control ◽  
Potential Candidate ◽  
Control Methods ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Converter Topologies ◽  
Multi Phase ◽  
And Control

Switched reluctance motor (SRM) provide a potential candidate for electric vehicle (EV) applications due to rigid structure, potentially low production cost, the absence of permanent magnets, excellent power-speed characteristics, and high reliability and robustness. This paper aims to review the current research on the design, winding topologies, converter topologies, and control methods of switched reluctance motors (SRMs). Torque ripple and vibration are the main drawbacks of SRMs, which constrain their application. To conquer these drawbacks, multi-phase SRMs (MSRMs), optimum structure, and control methods of SRMs have been utilized over the past decades. In this paper, MSRMs with multiple combinations of stator/rotor poles and winding arrangements are investigated. Different converter topologies are compared, and a full-bridge converter is suitable for SRMs used in EVs. Torque sharing function, direct torque control, and direct instantaneous torque control are the main control methods to reduce the torque ripple of SRMs, which have been comprehensively summarized.

scholarly journals Review of MVDC Applications, Technologies, and Future Prospects

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8294
Author(s):  
Sophie Coffey ◽  
Victor Timmers ◽  
Rui Li ◽  
Guanglu Wu ◽  
Agustí Egea-Àlvarez
Keyword(s):  
Case Studies ◽  
Distribution Systems ◽  
Wind Farm ◽  
Distribution Networks ◽  
Offshore Wind ◽  
Converter Topologies ◽  
The Common ◽  
Protection And Control ◽  
And Control ◽  
Distribution Grids

This paper presents a complete review of MVDC applications and their required technologies. Four main MVDC applications were investigated: rail, shipboard systems, distribution grids, and offshore collection systems. For each application, the voltage and power levels, grid structures, converter topologies, and protection and control structure were reviewed. Case studies of the varying applications as well as the literature were analyzed to ascertain the common trends and to review suggested future topologies. For rail, ship, and distribution systems, the technology and ability to implement MVDC grids is available, and there are already a number of case studies. Offshore wind collection systems, however, are yet able to be implemented. Across the four applications, the MVDC voltages ranged from 5–50 kV DC and tens of MW, with some papers suggesting an upper limit of 100 kV DC and hundreds of MV for distribution networks and offshore wind farm applications. This enables the use of varying technologies at both the lower and high voltage ranges, giving flexibility in the choice of topology that is required required.

Improving the efficiency of oilfield electric power distribution

2019 ◽  
pp. 79-87
Author(s):  
Yu. F. Yu. F. Romaniuk ◽  
О. V. Solomchak ◽  
М. V. Hlozhyk
Keyword(s):  
Power Distribution ◽  
Reactive Power ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Active Power ◽  
Oil Field ◽  
Total Power ◽  
Simultaneous Increase ◽  
Active Load ◽  
Step Down

The issues of increasing the efficiency of electricity transmission to consumers with different nature of their load are considered. The dependence of the efficiency of the electric network of the oil field, consisting of a power line and a step-down transformer, on the total load power at various ratios between the active and reactive components of the power is analyzed, and the conditions under which the maximum transmission efficiency can be ensured are determined. It is shown by examples that the power transmission efficiency depends not only on the active load, but also largely on its reactive load. In the presence of a constant reactive load and an increase in active load, the total power increases and the power transmission efficiency decreases. In the low-load mode, the schedule for changing the power transmission efficiency approaches a parabolic form, since the influence of the active load on the amount of active power loss decreases, and their value will mainly depend on reactive load, which remains unchanged. The efficiency reaches its maximum value provided that the active and reactive components of the power are equal. In the case of a different ratio between them, the efficiency decreases. With a simultaneous increase in active and reactive loads and a constant value of the power factor, the power transmission efficiency is significantly reduced due to an increase in losses. With a constant active load and an increase in reactive load, efficiency of power transmission decreases, since with an increase in reactive load, losses of active power increase, while the active power remains unchanged. The second condition, under which the line efficiency will be maximum, is full compensation of reactive power.  Therefore, in order to increase the efficiency of power transmission, it is necessary to compensate for the reactive load, which can reduce the loss of electricity and the cost of its payment and improve the quality of electricity. Other methods are also proposed to increase the efficiency of power transmission by regulating the voltage level in the power center, reducing the equivalent resistance of the line wires, optimizing the loading of the transformers of the step-down substations and ensuring the economic modes of their operation.

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