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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, there is growing interest in improving lithium-ion battery state monitoring. This is due to growing concern over ensuring reliable and safe operation of lithium-ion based energy storage system especially in automotive and stationary e.g. UPS in data center applications. In this paper, battery state of charge estimation based on Extended Kalman Filter (EKF) and improved battery model...
NTT Facilities has studied a degradation prediction technology for Valve-Regulated Lead-Acid Batteries which makes use of data obtained from a lead storage battery management system. This paper reports functions and effectiveness of the degradation prediction technology.
For IT data center and high voltage UPS applications, selecting a lithium-ion (Li-ion) backup solution for a critical standby power source can help users to benefit from a reduced installed footprint, optimized total facility energy and a reduced environmental footprint when compared to conventional battery solutions. Backup systems utilizing high power Li-ion cells offer the ability to significantly...
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...
Reducing the power consumed by base stations is an urgent requirement. Our research shows that it is possible to reduce electricity consumption, especially peak loads, by predicting the power demands of base stations. This approach is implemented in the Green Power Controller, a technique developed for the Green Base Station which is the power system of base stations used for disaster relief and reducing...
Cylindrical large formatted lithium-ion-battery “CH75” cells, battery pack “CH75-6” for stationary use, energy storage systems utilizing the CH75-6 to be applied to industrial applications and these characteristic points are described. In particular, energy storage systems for frequency-regulation applications and the cooling design of the battery panel are described.
Renewable energy system such as a photovoltaic, a wind turbine generation and fuel cell has attracted attention as alternative energy sources of fossil fuel. However, a distributed generating system with the photovoltaic or the wind turbine generation is difficult to obtain a constant power supply. Thus control of power leveling system is required to maintain the balance of power flow for irregular...
Recently, the Electric vehicles (EV) became more popular. The construction of the EV charging stations is important in order to satisfy the energy demand of large quantity of electric vehicles. This paper presents design and simulation of EV charging station using three-level converter in the grid-side as well as in the EV-side. The charging station architecture with an AC/DC conversion and DC/DC...
This paper discusses a control method for an electrolytic capacitor-less single-phase AC/DC converter with PFC capability and with constant dc-output voltage. Generally, single-phase AC/DC converters employ bulky electrolytic capacitors in order to smoothen the ripple power with twice the utility frequency. The proposed control method uses a T-type NPC circuit with a small film capacitor and decouple...
In this work the deployment of the Redflow Zinc Bromine Module (ZBM) in telecommunication applications under different scenarios is proposed. With a specific focus on remote area applications and long backup time, the ZBM can be used to outperform existing technologies. In fact, not only does the battery have superior performance compared to existing solutions, but the product proved to be very versatile...
Nickel Zinc technology was originally developed & patented in 1901 by Thomas Edison. The historical performance limitation has been the cyclic capability and stability of the rechargeable system. Recently, technological advancement and development activities made in several key areas have addressed this issue. The advanced Nickel Zinc electrochemical system we have been evaluating and developing...
In this paper, serial multi-module UPS system control considering battery module balancing is proposed. Because of the organization, the UPS system has some properties. One of them is output voltage is sum of each UPS module output voltage. Thus, each UPS module output voltage respective control can accomplish each battery module balancing according to SOCs of each battery module. As SOC is high or...
The application benefits of operating stationary batteries in a partial state of charge (PSoC) can be significant. Emerging markets and applications which require dynamic cycling operation with high charge efficiency, such as, utility scale energy storage and hybrid telecommunications sites can especially benefit from this mode of operation. PSoC operation improves charge efficiency (up to 99%) and...
This paper proposes state-of-charge (SOC) and remaining charge estimation algorithm of each cell in series-connected lithium-ion batteries. SOC and remaining charge information are indicators for diagnosing cell-to-cell variation; thus, the proposed algorithm can be applied to SOC- or charge-based balancing in cell balancing controller. Compared to voltage-based balancing, SOC and remaining charge...
Generally, the way of 0.1C current fully discharge battery capacity measurement, which is required for 10 hours discharge during this process, is time and energy consuming. This paper is to introduce a new method to measure battery capacity accurately in shorter time. This new method will use the technique of multi-frequency measurement for battery during discharge. This measurement will eventually...
The electric power generation system using the renewable energy has the essential problem of the output fluctuation. With expanding deployment of renewable energy, it is necessary to smooth the fluctuation of both long and short term frequency. One of the solutions to solve this problem is combining the renewable energy and the storage batteries. It is important to install the large storage system...
Energy consumption in Japan has been increasing year by year. In particular, energy consumption of the civilian sector and the transportation sector have doubled since the first oil crisis. Recently, energy saving activities, such as the power peak-cut or power peak-shift for the purpose of reducing electricity bills, is carried out. On the other hand, in the demand side of electric power, research...
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