Improvements of reactive power and energy measurements insensitive to frequency variations

2002 ◽  
Author(s):  
B. Djokic ◽  
P. Bosnjakovic
Keyword(s):  
Reactive Power ◽  
Power And Energy ◽  
Frequency Variations

scholarly journals Optimization of the power consumption mode of pumping stations of “Suv Okova” by reactive power

2021 ◽  
Vol 264 ◽  
pp. 04089
Author(s):  
Shavkat Muzafarov ◽  
Abdusaid Isakov ◽  
Ruzimurat Choriev ◽  
Zukhra Ismailova ◽  
Durdona Mustafoyeva
Keyword(s):  
Reactive Power ◽  
Optimality Criteria ◽  
Operating Conditions ◽  
Absolute Minimum ◽  
Unconstrained Optimization Problem ◽  
Pumping Stations ◽  
Mode Of Operation ◽  
Nonlinear Form ◽  
Compensating Devices ◽  
Power And Energy

The optimal modes of the existing compensating devices under operating conditions were determined. Minimum power and energy losses were taken as optimality criteria. The unconstrained optimization problem was considered, i.e., finding the absolute minimum. When solving the problem to find the optimal mode of operation of the “SUV OKOVA” network, a relative minimum was found since the system of constraints has a nonlinear form. The problem of conditional optimization in terms of reactive power is solved, for which the gradient method of quadratic programming is used.

New method for reactive power and energy measurement

1992 ◽  
Vol 41 (2) ◽  
pp. 280-285 ◽  
Author(s):  
B. Djokic ◽  
P. Bosnjakovic ◽  
M. Begovic
Keyword(s):  
Reactive Power ◽  
New Method ◽  
Energy Measurement ◽  
Power And Energy

scholarly journals Modular Self-Balancing Battery Charger Concept for Cost-Effective Power-Assist Wheelchairs

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1526 ◽  
Author(s):  
Ilya Galkin ◽  
Andrei Blinov ◽  
Ievgen Verbytskyi ◽  
Denys Zinchenko
Keyword(s):  
Reactive Power ◽  
Cost Effective ◽  
Power Losses ◽  
Battery Charger ◽  
Good Efficiency ◽  
Current Harmonics ◽  
Size Constraints ◽  
Electrical Devices ◽  
Power And Energy ◽  
The Given

The paper deals with a power charger capable of quick simultaneous charging of several unevenly discharged batteries. The charger is designed for use in conjunction with a recently developed power-assist wheelchair composed of two armrest modules associated with wheels—each with its own motor, driver and battery. Uneven discharge of the batteries is very possible in this application. Taking into account the charging power and energy comparable with the most powerful household electrical devices, the refreshing of these batteries and integration of the entire power supply chain into the household grid become a topical and challenging task. Solving of this task requires a special charger that has several channels and can unevenly apply charging power to these channels. At the same time, the charger must not generate current harmonics or reactive power, must operate with good efficiency and satisfy size constraints. In the given research, a configuration of several interleaved isolated single-ended primary-inductor converters is studied. The synthesized mathematical model of the proposed charger provides data about its static and dynamic characteristics while its experimental investigation focuses on operation details (power losses, control features etc.). The obtained results prove that the proposed concept complies with the above-mentioned requirements and can be applied in the discussed application.

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