Progress of Internet-Based Energy Management/Supervisory Control and Data Acquisition Systems Innovations in Power System Computer Control Technology Considering Paradigm Change in Energy Systems TAKENAKA Shoji Trends in Advanced Control Systems for Power Systems WATANABE Hiroshi / MITAMURA Kenichi / KUDO Yoshimasa Toshiba provides a broad range of systems for power systems, including energy management systems (EMS) for generation control and network analysis, supervisory control and data acquisition (SCADA) systems, and distribution automation systems (DAS). The requirements for these systems have been changing greatly in recent years, in line with the changing circumstances in the power system environment. We have therefore been making innovations to power system technologies in order to develop advanced control systems for power systems. First, we have developed an advanced middleware applied to virtual technology as an innovation of the system configuration. Second, we have developed a new information system, a high-performance telecommunication unit, and a remote terminal unit to assist operators. Through these innovations in power system technologies, we are aiming at the development of optimized control systems supporting stable power supply. Advanced Energy Management Systems for Electric Power Systems FUJIMOTO Yuji / ICHIKAWA Tadashi / ASANO Toshiaki In the field of energy management systems (EMS) for load dispatching centers of electric power utilities, a number of automatic load dispatching functions have been developed and introduced to ensure stable power supplies and optimally economic operation. Toshiba has been engaged in the research and development of various technologies and the creation of new services for EMS. With the progress made in introducing network technologies to EMS in recent years, it has become possible to improve the system of wide-area dispatching operations, such as joint training and cooperative operation between load dispatching centers and backup of a central load dispatching center. Furthermore, to reduce the burden on operators and facilitate optimal operation, we have developed an automatic supply and demand control technology that can respond flexibly to various operational restrictions, uncertainties with regard to distributed generators, and operator skills. New Distributed SCADA Systems on Wide-Area IP Network OHSAKO Yoshiaki / SAITO Hideki / TSUJI Hisashi Toshiba developed a middleware applying intranet technologies for supervisory control and data acquisition (SCADA) systems ahead of other companies, and supplied Japan’s first wide-area-network distributed SCADA system incorporating this middleware in 2005. For wide-area Internet Protocol (IP)-network distributed SCADA systems, we have applied our original technologies to realize the integration of servers by multisite management and highly reliable communications control, and to ensure security from unsecured networks. Based on the advantages of these technologies we have been leading the field of wide-area-network distributed systems, which has recently become the mainstream model for updating SCADA systems. Distribution Automation System for Wide-Area Operation NISHI Akinori / SAKURAI Mikiya / KONO Hiroki Since Toshiba's introduction of Japan's first distribution automation system (DAS), we have been developing such systems applying state-of-the-art technologies to meet the functional, operational, and performance requirements of users. In recent years, there has been growing demand from users for wide-area operation via information and communication networks, which can improve both the efficiency and flexibility of operations, reduce costs, and allow rapid sharing of information. We have therefore developed a new DAS for wide-area operation, and supplied this system to electric power utilities. The system is now in operation in large cities. High-Performance Remote Terminal Unit for Next-Generation SCADA System HASEGAWA Yoshiaki / SAIGO Nobuhiro / EBATA Yoshio The introduction of high-performance microprocessors with low power consumption is making it possible to improve remote terminal units (RTUs),leading to changes in the architecture of supervisory control and data acquisition (SCADA) systems. High-performance RTUs incorporating some of the server functions of a SCADA system will realize a distribution system that can manage theinformation of each substation connected to the computer center via a wide-area network. This is expected to be one of the key technologies forthe next-generation SCADA system. Remote Terminal Unit with Advanced Functions for Distribution Automation Systems TSUKADA Toru / TANAKA Toshio / KOSUGI Mitsugu Remote terminal units (RTUs) are widely used in the distribution automation system (DAS) environment to supervise and control load break switches dividing distribution feeders from branch facilities of electric power companies. Recently, there has been increasing demand for RTUs offering higher performance and functionality to safeguard the public from breakdown faults and control power quality including in connections between distributed power sources. Toshiba has developed an RTU for DAS to meet these requirements. The new RTU provides power system fault detection, fault tripping and quantitative measuring functions as well as a waveform collection function. In addition, it can also be used in an Internet Protocol (IP) network system. |