Wyniki wyszukiwania - BazTech

1

Hybrid parametric islanding detection technique for microgrid system

Jayanthi S., Xavier S. Arockia Edwin, Manoharan P. S.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 1

art. no. e140101

EN

In microgrid distribution generation (DG) sources are integrated parallelly for the economic and efficient operation of a power system. This integration of DG sources may cause many challenges in a microgrid. The islanding condition is termed a condition in which the DG sources in the microgrid continue to power the load even when the grid is cut off. This islanding situation must be identified as soon as possible to avoid the collapse of the microgrid. This work presents the hybrid islanding detection technique. This technique consists of both active and parametric estimation methods such as slip mode shift frequency (SMS) and exact signal parametric rotational invariance technique (ESPRIT), respectively. This technique will easily distinguish between islanding and non-islanding events even under very low power perturbations. The proposed method also has no power quality impact. The proposed method is tested with UL741 standard test conditions.

2

An improved air supply scheme for battery energy storage systems

Xinlong Zhu, Hong Shi, Wenbing Xu, Tong Zhang, Yansong Wang

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 2

art. no. e140692

EN

The overall efficiency of battery energy storage systems (BESSs) strongly depends on the temperature uniformity of the batteries, usually disregarded in studies of the integrated performance of BESSs. This paper presents a new battery thermal management system (BTMS) using a personalized air supply instead of a central air supply. Thermal models are established to predict the thermal behavior of BESSs with 400 battery packs. Moreover, several optimizations comprising the effect of the position and number of air inlets, the number, and angle of the baffles on the air distribution in the ducts are proposed. The results show that the distributed air supply from the main air inlet makes the air velocity in the main air ducts more uniform. It is demonstrated that air deflection is the main source of airflow inhomogeneity at the air outlets. The airflow uniformity is better when the baffles are added at the entrance and the bottom of each riser duct than at other locations. The improved air supply scheme makes the nonuniformity coefficient of air velocity reduced from 1.358 to 0.257. The findings can guide the selection of a cooling form to enhance the safety of BESSs.

3

A novel revolutionary substantial transformative control technique for solar fed-full bridge converter based energy stabilization for grid connected applications

Umamaheswari S., Karthigaivel R., Satheesh Kumar G., Vengadachalam N.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 2

art. no. e140517

EN

Nowadays, there is a need to increase the continuous usage of the power electronic converters like AC-DC, DC–DC, and DC–AC based on various applications like mobile charge controller and telecom base station. Also, for power stability control, these converters are utilized in the renewable energy system (RES). The output cannot be stable for a longer duration due to the inappropriate switching pulse and continued usage of the converter. For resolving the above issues, the soft-switching technique is implemented in the proposed system for controlling both converter and inverter for proper energy stabilization during the continuous operation of devices. The main objective of this work is to improve the solar power system using high voltage gain DC / DC converter. Similarly, an inverter delivers the continuous AC power to the grid system without any fluctuations. The revolutionary substantial transformative control (RSTC) technique has been employed to monitor and control the converters used in this system. The additional advantage of this system is battery-based energy management, which is only utilized under necessary conditions. During the initial stage, RSTC will track the solar power, and it compares with the reference voltage and produces the appropriate pulse to the converter switch. Based on the switching pulse, the full-bridge converter (FBC) will also enhance the DC voltage by providing the constant voltage for the grid-connected inverter system. Secondly, the proposed RSTC controller will be monitoring voltage amplitude and frequency of grid power system. If any variation appears due to source power fluctuation, the controller will recognize it and automatically vary the pulse width modulation (PWM) of an inverter and compensate the grid power. The design analysis and operating approaches of the proposed converter are verified by MATLAB / Simulink 2017b. The performance analysis has been done with various parameters like total harmonics distortion (THD), steady-state error and converter efficiency.

4

Zintegrowane systemy magazynowania energii elektrycznej w akumulatorach (BESS) w odpowiedzi na zapotrzebowanie na energię elektryczną. Z myślą o wyzwaniach w zakresie energii odnawialnej

Blood D.

Napędy i Sterowanie

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2018

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R. 20, nr 10

18--19

PL

Rozwiązania oparte na systemach magazynowania energii elektrycznej w akumulatorach (BESS) wykorzystują zalety najnowszych falowników, akumulatorów i pakietów oprogramowania w celu zwiększenia opłacalności energii odnawialnej.

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Zastosowania akumulatorowych systemów magazynowania energii w sieciach elektroenergetycznych

Ciach K.

Wiadomości Elektrotechniczne

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2006

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nr 8

30-32

PL

Omówiono bateryjny system magazynowania energii dla zastosowań regulacji mocy i wygładzania szczytów obciążenia.

EN

Application of batteries-based power storage system in power control and peak power smoothing systems - is discussed.