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High gain DC-DC converters have become increasingly popular in recent years as there is greater need to interface low voltage DC sources such as solar cells and batteries with much higher voltage DC buses. A new high gain DC-DC converter with high gain, galvanic isolation and an integrated passive snubber network is proposed in the paper. In the paper, the general operation of the converter is discussed,...
Impedance source inverters have attracted much attention in recent years due to their ability to behave as voltage elevators/reducers at their output terminals without the need of an extra dc/dc converter to accomplish this task. Among these inverters, the quasi-impedance source inverter (qZSI) is one of the most known topologies. It considers two basic operating states, the no-shoot-through state...
Power storage systems are expected to contribute the stable power distribution under disturbances in power systems. Recently, power quality such as momentum voltage sag is a critical issue for power systems. For maintaining power quality, battery is inevitable and expected to quickly respond to the disturbances in the power systems. Redox Flow Battery (RFB) is one of the batteries which is capable...
Lead-acid battery has been widely used as a standby power for telecom industry. As the different electrical characteristic of battery among different categories, even battery banks of same category and same manufacture but different serving age, they can't be directly used in parallel connection, or it will bring disastrous consequences, including fewer discharge capacity, shorter battery life. This...
In this study, we examined demand response using air conditioners, determined the number of people by measuring CO2, and examined an application method to demand response. Most of the power in buildings is consumed by air conditioners, and their impact on the overall power consumption is high. Therefore, controlling the power consumption of air conditioners is an important factor in conducting demand...
The evaluation of energy consumption for space heating in urban environment is an interesting topic for the issues related to energy and pollution management. In the paper is presented the analysis of measured energy consumption for residential buildings located in the cities of Torino and Reggio Emilia (Italy). In the first analysis, space heating consumptions were correlated with climatic data....
In this paper, we report on the results of controlling the state of charge (SOC) of batteries for back-up use by using weather forecasts in order to improve the self-consumption rate and store power for back-up. Regarding battery systems for utilizing variable renewable energy and back-up use, we suggest a method for charging and discharging batteries positively by changing the back-up capacity depending...
In this paper, methods of energy transformation to reduce OPEX for remote area are introduced which can be divided into efficiency improving and consumption reducing.
Telecommunications networks have been transitioning from a centralized to distributed architecture. With Fiber extending deeper into the wireline network and Small Cells becoming a more prevalent means for targeting hard-to-reach subscribers, there has been significant growth in the number of network elements located far from the central switching office. The sheer quantity of network devices increases...
Resonant inductive coupling wireless power transfer (RIC-WPT) is attracting attention as a convenient power supply method to small mobile apparatus. The efficiency and the power transfer capability of RIC-WPT has been known to be profoundly dependent on the quality factor of the receiving resonator. However, the quality factor of the receiving resonator tends to be deteriorated because of the conduction...
Cell voltage equalizers are important for the batteries of electric vehicles and other energy storage systems in order not to be reduced their capacity. The authors have proposed a cell voltage equalizer using an LC series circuit; however, the equalizer requires a lot of bi-directional and multi-stage connected switching elements to equalize the voltage across each battery cell. This paper proposed...
Front end PFC (power factor correction) boost ac-dc converter is an intrinsic part of applications like telecom servers, electric vehicle (EV) charging, and microgrids. In this paper a bridgeless PFC boost rectifier with two dc/dc boost circuits topology is employed to convert universal ac input to a fixed and regulated output dc voltage. High efficiency and power density are key figure-of-merits...
Multiple functions — Increasing Utility-Electrical Rates with lowering Energy (Solar) Costs — are influencing the decision of whether we should deploy solar for On-Grid Solutions. In this study, with a set of simulations, we look at what at the current considerations that can justify deploying Solar for On-Grid sites.
Telstra's telecommunication network covers a diverse area, which is subject to Australia's challenging environmental factors. These factors present challenges to the network and can prominently affect Telstra's remote sites, especially off-grid sites. This paper presents the key findings of using stationary fuel cells at these remote sites. The fuel cells implemented by Telstra are indirect methanol...
Digital lifestyle with always-on connection to internet as well as the emergence of Internet of Things (IoT) throughout the world calls for reliable, concurrently maintainable data center and telecommunications systems. Thus, this need had pushed the limit of electrical and mechanical system, in particular power and cooling systems to provide reliable, economical and maintainable services. This requirements...
Eco mode UPS will power the load with mains power supply directly when the quality of mains power supply is good. When the quality of mains power supply decreases Eco mode UPS will switch to double conversion mode rapidly to meet the requirement of power quality. Eco mode UPS has the highest efficiency and the highest reliability. Using Eco mode UPS is an important measure of data center energy saving,...
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