NTT DoCoMo, Nagasaki University of Science and Technology, and NTT Device Cross Technology (NXTEC) will develop control technology that can efficiently supply solar power to base stations. Specifically, we will develop a high-efficiency 1200V DC type power converter (DC power converter) and cooperative control technology that realizes highly efficient energy management and demonstrate its practical application. It was announced on November 12.
Verification will be conducted in cooperation with Nagasaki City, Kyushu Electric Power Transmission and Distribution, TMEIC and other organizations.
Improving the efficiency of solar power supply requires high voltage to reduce power loss and high efficiency energy management. In this demonstration, we will verify a system that prevents voltage sags and transmission blackouts by using high voltage 1200V in the solar power generation system and reduces conversion losses by transmitting the generated power as direct current instead of converting it to alternating current as alternating current does.
Series-parallel configuration DC power converter
(Source: NTT Docomo, Nagasaki University of Science and Technology and NXTEC jointly released)
Specifically, we will develop a DC power converter with 4 series inputs and 4 parallel outputs using gallium nitride, which is smaller and more efficient than conventional silicon. It is expected that the overall size and weight can be reduced to 1/3 of that of conventional power converters. The aim is to reduce the loss in the power supply process to 15%, which is about half of the conventional level. We will also verify stable operation through digital control and aim to achieve highly efficient power management through cooperative control.
The demonstration system has a solar panel capacity of 50kW and a battery capacity of 50kWh. Since the equipment on the Nagasaki University of Science and Technology campus will be used, power will not be supplied to the actual base station. Through this demonstration, we will establish the technology and consider verifying it at base stations. If the system built this time is applied to a real environment, it is expected to be able to supply enough power to 20 base stations. We aim to conduct demonstrations from 2024 to 2026, and commercialize and apply it in practice in 2027.
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