Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 4
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

In the 18th century Łazienki, Mokotów and Królikarnia were located outside of Warsaw. Due to the capital’s expansion, they lost part of their territory and the elements responsible for harmonious integration with the surroundings. An iconographic and cartographic documentations’ comparison with the current state shows, which parts and functions of the composition have been changed. These residences do not create the linked Warsaw Escarpment landcape gardens run, but still build the city identity.

Go to article

Authors and Affiliations

Anna Szendi
Download PDF Download RIS Download Bibtex

Abstract

A new type of non-inflatable metal tire is designed to prevent the flat tire caused by puncture and shrapnel penetration, and it can be used on star rovers and military or civilian wheeled vehicles. In order to study vibration damping characteristics of the new wheel, a specimen with the same size as the pneumatic tire (235/70 R16) is made for contrast tests. A filtering method is proposed to reduce impulse and random interference noise in collected vibration signal. Comparative analysis of ride comfort performance is conducted by solving weighted acceleration root mean square (RMS) values. The results show that the filtering method has a good effect, and ride comfort of the metal tire is slightly worse, while it has a better grasping ability. Therefore, some extended structures have been recommended to improve the vibration damping performance.

Go to article

Authors and Affiliations

Z. Zhenglong
S. Bin
L. Jiangang
D. Zhiguang
H. Zhongbo
Download PDF Download RIS Download Bibtex

Abstract

The problem of the proper functioning of Park-and-Ride facilities seems to be of key importance for ensuring appropriate transport in cities in which the intensity of road traffic is systematically increasing, together with the increase of environmental pollution (air pollution, noise etc.). The attractiveness of a car park of this kind seems obvious – instead of a burdensome journey in one’s own car, one changes the vehicle to fast municipal public transport or another means of transport (a bike, a scooter), or reaches the destination on foot. This results in benefits – above all in terms of comfort (shortening the time of the journey), health advantages etc. As has been proven by experiments, facilities of this kind are an expensive investment, the location of which (e.g. stand-alone) does not always ensure full utilization. The concept presented in the article assumes the possibility of a gradual extension of the multistorey car park following the increase of the demand. The article attempted to demonstrate that one of the sources of increasing attractiveness is the appropriate location (guaranteeing easy commute to the car park), the possibilities to continue the journey in an attractive way, then increasing the attractiveness through the possibility to use various services (shopping, the gym, the swimming pool, cinema, restaurants) and thirdly: the plan of launching the car park and its utilization in the life cycle should ensure the possibility of flexible reacting to changes of the demand (the experiences of the ongoing pandemic indicate that there is no guarantee of ensuring systematic demand increase). An element which also seems significant is the limitation of costs in the initial stage of investments of this kind with the possibility of gradual extension following the change of user habits.
Go to article

Authors and Affiliations

Jerzy Paslawski
1
ORCID: ORCID
Tomasz Rudnicki
2
ORCID: ORCID

  1. Poznan University of Technology, Faculty of Civil and Transport Engineering, 5 Piotrowo St., 60-965 Poznan, Poland
  2. Faculty of Civil Engineering and Geodesy, Military University of Technology in Warsaw,2 Gen. S. Kaliskiego St., 01-476 Warsaw, Poland
Download PDF Download RIS Download Bibtex

Abstract

For voltage-source-converter based high-voltage-direct-current (VSC-HVDC) transmission systems, fault ride-through (FRT) capability is a very important grid requirement in order to enhance its operational availability under an alternating current (AC) grid fault condition. Voltage sags during a short-circuit fault in power transmission lines can lead to fluctuations in the direct current (DC) link voltage of converter systems, and may induce reversed power flow and even trip a VSC-HVDC transmission system. A practical method is developed in this paper for investigating FRT capability of VSC-HVDC transmission system characteristics during a voltage sag event using experimental results from Smart Grid Laboratory. Symmetrical and asymmetrical voltage sag events with different remaining voltages are applied to an AC grid that lasts with a variable duration. The experimental waveforms of the two converter systems are recorded and analyzed in order to evaluate the FRT capability of VSC-HVDC transmission systems.
Go to article

Bibliography

[1] Hingorani N., Gyugyi L., Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems, IEEE Press, Willey (2000).
[2] Zhang X.P., Rehtanz C., Pal B., Flexible AC Transmission Systems: Modelling and Control, Springer- Verlag (2006).
[3] Yazdani A., Iravani R., Voltage-sourced converters in power systems: Modeling, Control, and Applications, IEEE Press, Wiley (2010).
[4] Flourentzou N., Agelidis V.G., Demetriades G.D., VSC-Based HVDC Power Transmission Systems: An Overview, IEEE Transactions on Power Electronics, vol. 24, pp. 592–602 (2009).
[5] Sessa S.D., Chiarelli A., Benato R., Availability Analysis of HVDC-VSC Systems: A Review, Energies, vol. 12, no. 14, pp. 1–22 (2019), DOI: 10.3390/en12142703.
[6] Alassi A., Bañales S., Ellabban O., Adam G., MacIver C., HVDC Transmission: Technology Review, Market Trends and Future Outlook, Renewable and Sustainable Energy Reviews, vol. 112, pp. 530–554 (2019), DOI: 10.1016/j.rser.2019.04.062.
[7] Patil P.R., Bhole A.A., A review on enhancing fault ride-through capability of distributed generation in a microgrid, In Proceedings of 2017 Innovations in Power and Advanced Computing Technologies (i-PACT), April 21–22, Vellore, India (2017), DOI: 10.1109/IPACT.2017.8245189.
[8] Yaramasu V., Wu B., Sen P.C., Kouro S., Narimani M., High-power wind energy conversion systems: State-of-the-art and emerging technologies, Proceedings of the IEEE, vol. 103, pp. 740–788 (2015).
[9] Feltes C.,Wrede H.,Koch F.W., Erlich I., Enhanced fault ride-through method for wind farms connected to the grid through VSC-based HVDC transmission, IEEE Transactions on Power Systems, vol. 24, pp. 1537–1546 (2009).
[10] Sang Y., Yang B., Shu H., An N., Zeng F., Yu T., Fault Ride-Through Capability Enhancement of Type-4 WECS in OffshoreWind Farm via Nonlinear Adaptive Control of VSC-HVDC, Processes, vol. 7, no. 540 (2019), DOI: 10.3390/pr7080540.
[11] Vrionis T.D., Koutiva X.I., Vovos N.A., Giannakopoulos G.B., Control of an HVDC Link Connecting a Wind Farm to the Grid for Fault Ride-Through Enhancement, IEEE Transactions on Power Systems, vol. 22, no. 4, pp. 2039–2047 (2007).
[12] Ramtharan G., Arulampalam A., Ekanayake J.B., Hughes F., Jenkins N., Fault ride through of fully rated converter wind turbines with AC and DC transmission systems, IET Renewable Power Generation, vol. 3, iss. 4, pp. 426–438 (2009).
[13] Sun W., Torres-Olguina R.E., Anaya-Laraa O., Investigation on Fault-ride through Methods for VSCHVDC Connected Offshore Wind Farms, Energy Procedia, vol. 94, pp. 29–36 (2016).
[14] Haleem N.M., Rajapakse A.D., Gole A.M., Fernando I.T., Investigation of Fault Ride-Through Capability of Hybrid VSC-LCC Multi-Terminal HVDC Transmission Systems, IEEE Transactions on Power Delivery, vol. 34, iss. 1, pp. 241–250 (2019).
[15] Li Y., Liu C., Tian X., Wang Z., Study on fault ride-through control of islanded wind farm connected to VSC-HVDC grid based on the VSC converter AC-side bus forced short circuit, The Journal of Engineering, vol. 2019, no. 16, pp. 3325–3328 (2019).
[16] Moawwad A., El Moursi M.S., Xiao W., Advanced fault ride-through management scheme for VSC-HVDC connecting offshore wind farms, IEEE Transactions on Power Systems, vol. 31, no. 6, pp. 4923–4934 (2016).
[17] Zhou Z., Chen Z., Wang X., Du D., Yang G., Wang Y., Hao L., AC fault ride through control strategy on inverter side of hybrid HVDC transmission systems, Journal of Modern Power Systems and Clean Energy, vol. 7, iss. 5, pp. 1129–1141 (2019).
[18] Feldman R., Farr E., Watson A.J., Clare J.C., Wheeler P.W., Trainer D.R., Crookes R.W., DC fault ride-through capability and STATCOM operation of a HVDC hybrid voltage source converter, IET Generation, Transmission and Distribution, vol. 8, iss. 1, pp. 114–120 (2014).
[19] Oguma K., Akagi H., Low-Voltage-Ride-Through Performance of an HVDC Transmission System Using Two Modular Multilevel Double-Star Chopper-Cells Converters, Electrical Engineering in Japan, vol. 200, pp. 33–44 (2017), DOI: 10.1109/TPEL.2016.2615048.
[20] Yang B., Sang Y.Y., Shi K., Yao W., Jiang L., Yu T., Design and real-time implementation of perturbation observer based sliding-mode control for VSC-HVDC systems, Control Engineering Practice, vol. 56, pp. 13–26 (2016).
[21] Yang B., Jiang L., Yu T., Shua H.C., Zhang C.K., Yao W., Wu Q.H., Passive control design for multiterminal VSC-HVDC systems via energy shaping, International Journal of Electrical Power and Energy Systems, vol. 98, pp. 496–508 (2018).
[22] Dumnic B., Popadic B., Milicevic D., Vukajlovic N., Delimar M., Control Strategy for a Grid Connected Converter in Active Unbalanced Distribution Systems, Energies, vol. 12, no. 7 (2019), DOI: 10.3390/en12071362.
[23] Latorre H.F., Ghandhari M., Soder L., Active and Reactive Power Control of VSC-HVDC, Electrical Power System Research, vol. 78, pp. 1756–1763 (2008).
[24] Li C., Li Y., Guo J., He P., Research on emergency DC power support coordinated control for hybrid multi-infeed HVDC system, Archives of Electrical Engineering, vol. 69, no. 1, pp. 5–21 (2020).
[25] Yang B., Yu T., Zhang X., Huang L., Shu H., Jiang L., Interactive teaching-learning optimizer for parameter tuning of VSC-HVDC systems with offshore wind farm integration, IET Generation, Transmission and Distribution, vol. 12, no. 3, pp. 678–687 (2018).
Go to article

Authors and Affiliations

Ngo Minh Khoa
1
ORCID: ORCID
Nguyen An Toan
1
ORCID: ORCID
Doan Duc Tung
1
ORCID: ORCID

  1. Faculty of Engineering and Technology, Quynhon University, Vietnam

This page uses 'cookies'. Learn more