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AC and DC - DOAJ

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Last Updated: 10 May 2022

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A comparative study of AC and DC public electric vehicle charging station usage in Western Australia

Many times faster than Level 2 AC charging stations, DC fast-charging stations can charge an electric car several times faster than Level 2 AC charging stations. For Western Australia, this paper investigates and compares typical customer usage patterns at DC fast-charging stations against Level 2 AC charging stations to determine the benefits of moving to DC charging for Western Australia. It includes details from The University of Western Australia's AC and DC charging network in Perth, Western Australia's rural South West, from Augusta to Augusta.

Source link: https://doi.org/10.1016/j.rset.2022.100021


Investigation of electronic polarization – AC and DC conductivities of CeO2/MnO2 nanocomposite

The dielectric reaction of CeO2/MnO2 powder particle was investigated and synthesized by using hydrothermal method. Our X-ray diffractometer analysis helps us determine cubic volume with an average crystallite size 11. 39 nm. The particular surface area and band gap of our products was calculated as 3. 78 eV by this study's diffusive reflectance spectrum. The correlation between dielectric loss and conductivity is reported. According to crystallite size and nancomposites' presence, the dielectric constant is high.

Source link: https://doi.org/10.1016/j.jksus.2022.101990


Research on Hybrid Microgrid Based on Simultaneous AC and DC Distribution Network and Its Power Router

The global energy consumption structure reform continues to expand under the dual pressure of environmental pollution and energy crisis, while the concept of energy internet has flourished quickly. To achieve power routing control of microgrid and ensure reliable operation oversight of the microgrid, a modular multi-interface system of power routers applied to AC–DC hybrid microgrid and its control scheme are used, together with power electronics, a modular multi-interface system of power routers and its control system are used. The efficiency and effectiveness of the power router for microgrid routing control are determined by building the prototype of simultaneous AC–DC hybrid microgrid and its power router.

Source link: https://doi.org/10.3390/en12061077


Equivalence of Primary Control Strategies for AC and DC Microgrids

Microgrid frequency and voltage control is a challenging proposition, considering that conventional generators with rotational inertia are usually replaced by converter-interfaced controllers that do not have any inertial response. The aim of this paper is to investigate and compare auto-control methods for alternating current and direct current microgrids that increase this transient behavior. In this context, a virtual synchronous machine method for AC microgrids is investigated, and its behaviour for different values of emulated inertia and droop slopes is investigated.

Source link: https://doi.org/10.3390/en10010091


Active and reactive power control of hybrid offshore AC and DC grids

The power transfer capacity from the larger offshore wind farm is limited by the HVDC transmission system, however, it is still economical for large power wind farm integration with the grid. Another way to expand the offshore network is to establish an offshore AC grid network connecting many offshore wind farms. In this article, an offshore AC grid is connected to an offshore DC grid, which is integrated with a voltage source converter's operational and control scheme. The article discusses the control principle of offshore AC network frequency and voltage with respect to active and reactive power distribution in the AC network.

Source link: https://doi.org/10.1080/00051144.2019.1639119


Peer-to-Peer Energy Trading of a Community Connected with an AC and DC Microgrid

The recognition of self-consumption of grid-connected rooftop solar photovoltaic owners in a community as well as the development of a new peer-to-peer energy trading system for next-generation power systems resulted in the creation of a new peer-to-peer energy trading system for next-generation power systems. Prosumers and customers can self-organize and trade energy among themselves in the peer-to-peer energy trade market environment. The operational costs of an individual household and community when using alternating current and DC home appliances are estimated in this paper, according to bill sharing and the mid-market rate method for various degrees of PV penetration. In proportion to the amount of electricity they use/generate, the bill sharing scheme discloses the operational cost and income of all of their peers. Based on the relationship between total production and demand, the mid-market rate method calculates the P2P internal price at the median of the import and export price at the median of the import and export price at the median of the import and export price.

Source link: https://doi.org/10.3390/en12193709


AC and DC global electric circuit properties and the height profile of atmospheric conductivity

An apparent discrepancy was pointed out at all heights and by up to an order of magnitude - between the height profiles of atmospheric conductivity extracted at AC using ELF propagation studies, especially from studies on Schumann resonance of the Earth-ionosphere cavity, and a simulation of the DC global atmospheric electric circuit. The AC results in the middle atmosphere, where the atmosphere's resistance is the most prominent, are close to the Earth's surface, where the atmospheric resistance is the most prominent, whereas in the middle atmosphere, at heights of 40 and 100 km, full wave computations indicate that the AC results are the more important. SGR 1806-20, a massive gamma-ray fire that occurred at 21:30 U. T. , has been recognized internationally in the context of a global averaged profile. Published observations of the ionospheric effects of the massive gamma-ray eruption from SGR 1806-20, which occurred at 21:30 U. T. , published in the context of a globally representative snapshot.

Source link: https://doi.org/10.4401/ag-6870


Comparative Study of Breakdown Voltage of Mineral, Synthetic and Natural Oils and Based Mineral Oil Mixtures under AC and DC Voltages

This paper discusses a comparative investigation of AC and DC breakdown voltages of based mineral oil blends with natural and synthetic esters mainly used in high voltage power transformers. According to IEC 60156 standards, AC breakdown voltages were measured using a sphere-sphere electrode system; the same model was used for DC measurements because there are no standard voltage waveforms for this voltage waveform. The Normal and Weibull distribution functions were used to analyze the experimental results, and the best function that the data followed was used to determine the breakdown voltage with a chance of 1%, 10%, and 50%. Ester oils have a significantly higher breakdown voltage than mineral oil, regardless of the applied voltage waveforms, according to the author. The addition of just 20% of natural or synthetic ester oil was enough to greatly raise the breakdown voltage of mineral oil. Thus, re-filling transformers with up to 20% mineral oil residues with ester oils poses no issue; it is also convenient considering only the breakdown voltage. The natural ester mixtures are always traceable under AC, and they never follow the behavior of vegetable oil alone. With the exception of the 20% natural ester in DC, the breakdown voltages of all the tested mixtures were in accordance with the standard distribution, making it possible to determine the breakdown voltages for the risk factors of 1%, 10%, and 50% of likelihood.

Source link: https://doi.org/10.3390/en10040511


AC and DC Differential Bridge Structure Suitable for Electrochemical Interfacial Capacitance Biosensing Applications

This paper discusses a capacitive differential bridge system with both AC and DC excitation as well as balancing capability for low cost electrode-solution interfacial capacitance biosensing applications. Because of the necessary establishment of the balancing networks, sensitivity, and linearity, it is necessary to assess the bridge's results in practice. To determine the bridge's results in practice, potential effects of initial bridge imbalance due to component mismatches are investigated. With a custom single frequency real-time amplification/filtering readout board and sine fitting, the proposed series RC bridge system is introduced along with a custom single frequency real-time amplification/filtering readout board.

Source link: https://doi.org/10.3390/bios10030028


Transition towards DC micro grids: From an AC to a hybrid AC and DC energy infrastructure

Photovoltaics convert DC voltages at the same time, while most common storage techniques use DC. It is possible to minimize significant energy losses that occur whenever electricity is converted by converting DC power to DC instead of converting it to AC first. In one of the buildings of the newly developed living lab area called the District of Tomorrow, which is located in Heerlen, the Netherlands, a prototype DC installation will be designed and tested. The new energy infrastructure is largely based on AC, manufacturers produce AC-based AC controls, and consumers are still using several AC products over a long life span. The aim is to investigate the challenges involved in the switch to DC micro grids, assess the commercial viability of DC applications in the built environment, and create a framework that results in commercial success.

Source link: https://doi.org/10.7480/spool.2017.2.1934

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions