成果報告書詳細
管理番号20130000000668
タイトル*平成24年度中間年報 米国ニューメキシコ州における日米スマートグリッド実証(12)
公開日2013/11/20
報告書年度2012 - 2012
委託先名古河電池株式会社
プロジェクト番号P09023
部署名スマートコミュニティ部
和文要約
英文要約1. Research and development details and results
1.1 Advanced Lead Acid Battery equipment used in the Smart Grid Project
This storage system consists of 163 series, connected batteries with a rating capacity of 500Ah (10 hour rate capacity).A monitoring system is attached to the battery to measure the voltage, internal impedance, and temperature of single cells and the total voltage, current of string of the batteries, and ambient temperature. Measured data is transmitted to the battery management system.
1.2 Capacity test of string of the batteries
Capacity test of string of the batteries was conducted in Albuquerque. The discharge current was approximately 0.1 C10A and approximately 0.5 C10A and the cut-off voltage was 303 V (1.86 V/cell). The discharge capacity was 492 Ah (approximately 0.1 C10A) and 293 Ah (approximately 0.5 C10A).
1.3 Charge and discharge efficiency of string of the batteries
The charge and discharge efficiency of string of the batteries during the capacity test was calculated. When the discharge current was approximately 0.1 C10A, the charge and discharge efficiency of string of the batteries was 86.3% (target: 80% or higher), so the result was excellent.
1.4 Charge and discharge behavior of string of the batteries
The charge and discharge behavior of the operating string of the batteries was checked at the demonstration site in Albuquerque and the results showed that the battery quickly responded within several seconds to instructions for charging and discharging from the BEMS (Building Energy Management System).
1.5 Capacity test of single cells
The capacity test was conducted under the test conditions of an ambient temperature of 25°C, a discharge current of 0.1-0.6 C10A, and a cut-off voltage of 1.8 V/cell. The discharge capacity of 0.1 C10A is equal to or higher than the rated capacity. The discharge voltage was within the DC voltage of the PCS at each discharge current value.
1.6 Input and output test of single cells
The input/output test was conducted under the test conditions of an ambient temperature of 25°C, an SOC of 70%, and a charge and discharge current of 0.1-0.6 C10A. The charge and discharge voltage was within the DC voltage of the PCS at each charge and discharge current value.
1.7 Summary of the results
a. The initial capacity test performed in the project showed that string of the batteries has good characteristics, as the battery’s charge and discharge efficiency was 86.3%.
b. We will investigate whether the electric energy needed for an equalizing charge can be reduced according to the benchmark evaluation.
c. Judging from the charge and discharge behavior during the battery’s operation, the Advanced Lead Acid Battery appears to be working effectively in the Smart Grid Project.
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