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Smart Grid for Realization of Low-Carbon Society Prospect and Realization of Smart Grid YOKOTA Takeshi Trends in Smart Grid Technologies and Toshiba's Approach WATANABE Hiroshi / SHOBATAKE Yasuro Global warming due to increased emissions of greenhouse gases has become a serious issue in recent years. In order to achieve a low-carbon society, there is a strong need for the construction of smart grids to introduce renewable energy sources and improve the efficiency of energy usage in the power generation sector. However, as renewable energy sources such as solar, wind, and other natural energies are extremely dependent on natural factors, more efficient integration of solar and wind power into existing grid systems has been attracting considerable attention as a solution to these issues. Toshiba has been participating in large-scale pilot projects to gain a deeper understanding of these issues, and developing related technologies to realize a smart grid based on the results of these efforts. We are also actively promoting the international standardization of such smart grid-related technologies for entry into the global market. µEMS Next-Generation Energy Management System for Smart Grids YOSHIMURA Yoshihiko / KOBAYASHI Takenori / YANO Ryo The introduction of renewable energy sources such as solar power and wind power into existing power systems is being promoted on a global scale with the aim of realizing a low-carbon society. As power generation from renewable energy sources fluctuates greatly depending on the weather conditions, a smart grid integrating these renewable energy sources is required to perform both supply and demand control in the smart grid itself and coordinate operation with trunk power systems, in order to maintain the energy balance between supply and demand. Toshiba has developed the µEMS (Micro Energy Management System) not only to improve power supply reliability for smart grids but also to enhance operation efficiency of whole power systems through optimum power control using storage batteries. Output Power Fluctuation Suppression Technology for Photovoltaic Power Generation Systems OKUDA Yasuo / KIMURA Misao Photovoltaic (PV) power generation is expected to play a significant role in reducing carbon dioxide (CO2) emissions. Japan has set a target of increasing the introduction of PV power generation systems to 20 times the installed capacity by 2020 compared with the level in 2005. However, as renewable energy sources such as PV power are affected by weather conditions, their output tends to be unstable. The large-scale connection of PV power generation systems to the power grid will therefore make it difficult to maintain frequency control of power grid lines. Toshiba has developed prototype suppression equipment to control output power fluctuations through the use of rechargeable batteries, and verified the performance of the system for practical application. We are continuing our efforts to further improve the performance of this system, and incorporate it into PV power generation systems. 50 kW Storage Battery System Applying SCiBTM Batteries for Photovoltaic Power Generation Systems SHIMADA Naoto / UMEHARA Tatsushi / OTSUKA Masahiro As electricity generation systems using renewable energies such as photovoltaic (PV) power make a substantial contribution to the reduction of carbon dioxide (CO2) emissions, such systems have been increasingly introduced in recent years. However, when PV power generation systems, whose output tends to fluctuate in accordance with weather conditions, are incorporated into an electric power system, it is necessary to introduce an energy storage system with rechargeable batteries for the stabilization of output fluctuations. Toshiba has developed a 50 kW storage battery system applying our SCiBTM batteries with excellent life performance and high safety. This system can store 10 kWh of power and maintain more than 80% of capacity after 34,000 charge-discharge cycles through the optimization of output power capacity between the storage battery system and power conditioning system (PCS). Advanced Metering Infrastructure for Smart Grid NITTA Keiko / MIE Kunitoshi / GOTO Yoshihide The United States is actively promoting the smart grid to solve power supply and demand problems existing between power utilities and consumers by means of information and communication technology (ICT). Toshiba has developed major components for a prospective advanced metering infrastructure (AMI) system for the smart grid including a smart meter, an in-home display, and a meter data management system (MDMS). The smart meter measures the instantaneous values of active power, reactive power, voltage, current, and frequency based on the American National Standards Institute (ANSI) C12.20 0.5% accuracy class standard. It also transmits measurement data for power utilities via Ethernet, and communicates watt-hour values to the in-home display using the ZigBee short-range wireless communication protocols for home appliances. The in-home display shows real-time power, watt-hour, and demand trend graphs. The MDMS performs management and control of smart meters using interactive network communications and analyzes utility operations from the collected data. AMSOTM Unified Key Management Mechanism Integrating Authentication and Encryption for Smart Meters An advanced metering infrastructure (AMI) system is one of the important elements of a smart grid system. In an AMI system, so-called smart meters with communication functionality are required instead of conventional electrical meters. Toshiba has developed AMSOTM (advanced meter sign-on), a unified key management mechanism for smart meters, which integrates the key management functions of authentication, encryption, and integrity for all communication applications on smart meters. It can be used for future communication applications for smart meters as well as for strengthening the security of smart meters. |