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The Wide-Area Control and Operation System for stabilizing renewable energy generations utilizing averaging effect was proposed to reduce capacity of battery energy storage system and a demonstrative project supported by Ministry of Environment of Japan was conducted in order to verify effects of the proposed system. In this paper, concept and configuration of the system are introduced and verification...
This paper proposes a PFM+PWM hybrid controlled soft-switching half-bridge converter which has both benefit of conventional half-bridge converter and LLC converter. Generally, conventional half-bridge converter has good constant current characteristic due to PWM control, however it has some drawbacks of (1) primary side switches and secondary side diodes operate under hard switching, (2) two magnetic...
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 data center of the cloud which supports the recent communications infrastructure requires the high reliable control systems in order to control its enormous electric power and exhaust heat. It is important to reduce the energy wasted by the control systems. The FPGA is watched because of the low energy, the long sustainability, and the simple architecture. It is clarified that the FPGA realizes...
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