A new adaptive instantaneous average current sharing technique for circulating current minimization among parallel converters in a LV DC-microgrid

2022 ◽  
Vol 136 ◽  
pp. 107562
Author(s):  
Walid M. Nassar ◽  
Olimpo Anaya-Lara ◽  
Khaled H. Ahmed
Keyword(s):  
Dc Microgrid ◽  
Current Sharing ◽  
Circulating Current ◽  
Average Current ◽  
Parallel Converters

scholarly journals An Implementation of Parallel Buck Converters for Common Load Sharing in DC Microgrid

Information ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 91 ◽  
Author(s):  
Sikander Ali ◽  
Tang Shengxue ◽  
Zhang Jianyu ◽  
Ahmad Ali ◽  
Arshad Nawaz
Keyword(s):  
Control Level ◽  
Load Sharing ◽  
Current Control ◽  
Simulation Software ◽  
Buck Converters ◽  
Droop Control ◽  
Primary Control ◽  
Dc Microgrid ◽  
Current Sharing ◽  
Circulating Current

The increase in demand for clean, safe, and environmentally friendly renewable energy sources faces several challenges such as system design and reliable operations. DC microgrid (MG) is a promising system due to higher efficiency and natural interface to renewable sources. In the hierarchical control of DC Microgrid, the V-I droop control is deployed usually in primary control level for common load sharing between converters. However, conventional droop control causes improper current sharing, voltage variations, and circulating current regulation due to the presence of droop and line resistance between converters. The aim of this paper is to presents the primary control level design of buck converters in current mode control according to the concepts of time constant and time delay, and secondary control design for parallel operations in distributed manners by combining methods, namely, low bandwidth communication (LBC), circulating current minimization techniques, and average voltage/current control. Moreover, different time delays are used for two converters to testify the effects of communication delays on current sharing and voltage restoration. The simulation is done for 2 × 2.5 KWdc parallel buck converters in PLECS (a Simulation software used for high speed simulation for power electronics) environment which shows excellent results in minimizing circulation currents, enhancing proportional current sharing, and restoring the grid voltage.

The efficient use of stabilizing materials in superconducting solenoids

1969 ◽  
Vol 47 (13) ◽  
pp. 1401-1407 ◽  
Author(s):  
Richard Stevenson
Keyword(s):  
Current Density ◽  
Transient Heat Conduction ◽  
Point Of View ◽  
Average Current Density ◽  
Initial Current ◽  
Current Sharing ◽  
Purity Aluminium ◽  
High Purity Aluminium ◽  
Average Current ◽  
Composite Conductor

The problem of stability of superconducting solenoids is considered from a thermal point of view. The transient heat conduction equation for a superconducting tape clad with normal material and operated in a current sharing mode is studied, and a solution for the temperature distribution is obtained. The composite conductor is considered stable if its final temperature in the current sharing mode corresponds to the critical temperature for the initial current density in the superconductor. Using this criterion, the operating point of the superconductor and its stabilizing cladding thickness can be chosen to give a maximum average current density in the composite conductor at any field. Calculations are given for Nb3Sn tape clad with OFHC copper and with high purity aluminium.

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