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This paper presents a flywheel energy storage system (FESS) for load-leveling. In order to improve the efficiency and the lifetime, a permanent magnet synchronous motor, a spherical spiral groove bearing (SSGB) and a magnetic assist system are applied to the prototype. The variable thrust by the proposed magnetic assist system is evaluated. As a result, the variation of thrust becomes 16.4%. In addition,...
This paper introduces the flywheel energy storage system (FESS) in a long lifetime uninterruptible power supply. The first prototype FESS (3.0-MJ) uses low cost ball bearings and general purpose induction motor in terms of cost reduction. From the experimental results, it is confirmed that the charge and discharge efficiency of the FESS is 60.7% (charge 80.7%, discharge 75.1%). In order to improve...
This paper introduces the performance of a power leveling system with a 3.0-MJ, 3315-r/min flywheel energy storage. In terms of cost reduction, this system uses low cost ball bearings and general purpose induction motor. Therefore, such a system configurations occurs large loss during standby mode. In order to overcome this problem, low loss design algorithm that focuses on the mechanical loss is...
This paper discusses an uninterrupted power supply (UPS) with a flywheel and a matrix converter using a direct grid connection. A flywheel type UPS has a problem where a standby power is bigger than that of the battery or EDLC type UPS. To solve this problem, an operation known as direct grid connection mode is proposed, where a matrix converter is the interface converter between the flywheel and...
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