Control Systems for Independent Operation of Parallel DG Units in DC Distribution Systems

2006 ◽  
Author(s):  
M. Mahmoodi ◽  
G. B. Gharehpetian ◽  
M. Abedi ◽  
R. Noroozian
Keyword(s):  
Control Systems ◽  
Distribution Systems ◽  
Dc Distribution

TO THE STABILITY OF TANK VEHICLES IN THE BRAKE MODE

2019 ◽  
pp. 27-32
Author(s):  
Denys Popelysh ◽  
Yurii Seluk ◽  
Sergyi Tomchuk
Keyword(s):  
Mathematical Model ◽  
Control Systems ◽  
Distribution Systems ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Center Of Mass ◽  
Dynamic Processes ◽  
Course Stability ◽  
The Stability ◽  
Tank Vehicles

This article discusses the question of the possibility of improving the roll stability of partially filled tank vehicles while braking. We consider the dangers associated with partially filled tank vehicles. We give examples of the severe consequences of road traffic accidents that have occurred with tank vehicles carrying dangerous goods. We conducted an analysis of the dynamic processes of fluid flow in the tank and their influence on the basic parameters of the stability of vehicle. When transporting a partially filled tank due to the comparability of the mass of the empty tank with the mass of the fluid being transported, the dynamic qualities of the vehicle change so that they differ significantly from the dynamic characteristics of other vehicles. Due to large displacements of the center of mass of cargo in the tank there are additional loads that act vehicle and significantly reduce the course stability and the drivability. We consider the dynamics of liquid sloshing in moving containers, and give examples of building a mechanical model of an oscillating fluid in a tank and a mathematical model of a vehicle with a tank. We also considered the method of improving the vehicle’s stability, which is based on the prediction of the moment of action and the nature of the dynamic processes of liquid cargo and the implementation of preventive actions by executive mechanisms. Modern automated control systems (anti-lock brake system, anti-slip control systems, stabilization systems, braking forces distribution systems, floor level systems, etc.) use a certain list of elements for collecting necessary parameters and actuators for their work. This gives the ability to influence the course stability properties without interfering with the design of the vehicle only by making changes to the software of these systems. Keywords: tank vehicle, roll stability, mathematical model, vehicle control systems.

Full-current-based directional pilot protection for VSC-DC distribution systems

2019 ◽  
Vol 13 (16) ◽  
pp. 3713-3724 ◽  
Author(s):  
Meng Li ◽  
Ke Jia ◽  
Tianshu Bi ◽  
Congbo Wang ◽  
Rui Zhu ◽  
...  
Keyword(s):  
Distribution Systems ◽  
Dc Distribution ◽  
Pilot Protection

scholarly journals Guest Editorial: Special Section on Smart DC Distribution Systems

2014 ◽  
Vol 5 (5) ◽  
pp. 2473-2475 ◽  
Author(s):  
Josep M. Guerrero ◽  
Ali Davoudi ◽  
Fqarrokh Aminifar ◽  
Juri Jatskevich ◽  
Hiroaki Kakigano
Keyword(s):  
Distribution Systems ◽  
Guest Editorial ◽  
Special Section ◽  
Dc Distribution

scholarly journals Soft-Switching Full-Bridge Converter with Multiple-Input Sources for DC Distribution Applications

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 775
Author(s):  
Sheng-Yu Tseng ◽  
Jun-Hao Fan
Keyword(s):  
Conversion Efficiency ◽  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Soft Switching ◽  
Maximum Output ◽  
Power Distribution Systems ◽  
Distribution Method ◽  
Dc Distribution ◽  
Multiple Input

Due to the advantages of power supply systems using the DC distribution method, such as a conversion efficiency increase of about 5–10%, a cost reduction of about 15–20%, etc., AC power distribution systems will be replaced by DC power distribution systems in the future. This paper adopts different converters to generate DC distribution system: DC/DC converter with PV arrays, power factor correction with utility line and full-bridge converter with multiple input sources. With this approach, the proposed full-bridge converter with soft-switching features for generating a desired voltage level in order to transfer energy to the proposed DC distribution system. In addition, the proposed soft-switching full-bridge converter is used to generate the DC voltage and is applied to balance power between the PV arrays and the utility line. Due to soft-switching features, the proposed full-bridge converter can be operated with zero-voltage switching (ZVS) at the turn-on transition to increase conversion efficiency. Finally, a prototype of the proposed full-bridge converter under an input voltage of DC 48 V, an output voltage of 24 V, a maximum output current of 21 A and a maximum output power of 500 W was implemented to prove its feasibility. From experimental results, it can be found that its maximum conversion efficiency is 92% under 50% of full-load conditions. It was shown to be suitable for DC distribution applications.

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