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Reduction of power use in telecommunications building has become a social responsibility as a means of reducing the level of atmospheric CO2 that is a cause of global warming and to counter rising costs of electricity. One means of reducing power consumption is to introduce HVDC systems. This paper reports the issues involved in studying a multi-output HVDC/48Vdc power supply system and presents the...
The facility cost of the storage systems are a critical issue in the construction of micro grid, which is the core of the renewable energy. We propose the direct current mutual power interchange system as a way to reduce the storage battery capacity. This paper reports the outline of the proposed system and the verified result on the effect caused by electricity interchange upon the reduction of battery...
In recent years, storage batteries have been introduced to suppress fluctuations in the output power of renewable energy sources. The lifetime of batteries used in these systems varies based on the operational methods used. In this study, we investigated the effects of introducing a flywheel into a microgrid comprising photovoltaic equipment, batteries, and a load. The flywheel reduced the maximum...
In this paper a resonant voltage doubler circuit is reported on, which enables high efficiency and low power consumption of a solar cell DC-DC converter (PV converter) for solar cell input. We have also developed a PV converter that uses a resonant voltage doubler circuit and achieved high conversion efficiency of 97.6% at an output power of 10kW.
At the present time, the concept of coordination of photovoltaic generation systems with existing power systems has become the focus of increasing attention. Taking coordination between photovoltaic generation systems and power storage equipment as its theme, this paper elucidates the outlook for control conditions and the recovery of costs with the focus on economic performance and also reports on...
The effectiveness of two patterns for operating a self-sufficient (i.e., smart) microgrid was investigated. One pattern minimizes connection time to the utility power grid, and the other minimizes the peak load drawn from the utility power grid and maximizes battery life. Field testing of a demonstration system showed that it can switch between modes (island, charge, and backup) and continue to supply...
A consideration of short-circuit protection in high voltage direct current (HVDC) distribution system is written in this paper. There are some types of energy sources in HVDC system, and the behavior of short-circuit current is affected by the way to rectify. Therefore, it may be more complicated to protect short-circuit in HVDC system than it is in AC system. In this study, a protection technique...
In recent years, 380Vdc distribution systems have been expected to be one of the energy saving solutions for telecommunication buildings and data centers. However, DC distribution systems have various problems. In this paper, We report the results of an investigation of inrush current, including current size, effects and testing methods, as one problem in the construction and operation of 380Vdc power...
In recent years, higher voltage direct current (HVDC) distribution systems have been developed to reduce power consumption in telecommunication buildings and data centers. Thus, a demonstration test has been conducted to determine the energy efficiency, power stability, and safety of the HVDC system. The demonstration test was conducted in an in-service data center. The test results show that the...
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