Transmission and Distribution System Business

We support power transmission and distribution by fusing power system technology with the latest ICT

Transmission and Distribution System Business

Electricity used in factories, offices, and homes is generated by sources such as power plants, solar panels, and wind turbines, and is delivered through power distribution facilities such as transmission lines and substations.
The environment surrounding power distribution continues to change rapidly, with developments such as power liberalization and strengthening measures against power outages in the event of large-scale natural disasters. We constantly monitor, control, and protect power distribution facilities using the power system technology we have cultivated and the latest ICT to ensure that power distribution facilities can safely and reliably deliver electricity.

Power System Control

Power System Control accurately predicts the electricity used by consumers (factories, offices, homes, etc.) and electricity generated by renewable energy, and contributes to the stable supply of electricity by monitoring and controlling the electricity generated by power plants and the electricity flowing through transmission lines and substations in real time.
In addition, while monitoring the state of the system, these systems determine the control details in advance assuming a grid accident, and contribute to preventing large-scale power outages by performing high-speed control at the time of an accident. Also, by providing control to maintain the stability of the grid during normal times, they contribute to the effective use of power equipment and the introduction of renewable energy.

Business Overview

Central power supply control center systems with prediction, planning, analysis, and control technology

We plan the balance between demand and supply by predicting electricity consumption and generation, and develop systems that realize stable supply of electricity, economic operation, and appropriate information provision through grid analysis calculations and real-time supply and demand adjustment.

Wide area grid monitoring and control systems connecting multiple bases

We develop systems that realize efficient operations and rapid accident response by monitoring and controlling the overall flow of electricity from power plants to consumers by linking the operation bases of electric utilities on a network.

Grid stabilization development using advanced technology

We develop systems that prevent large-scale power outages and maintain stable operation of the grid by using cutting-edge AI technology to control the output of generators in response to changing grid conditions over time.

Large-scale database of power grid that realizes CPS

We reproduce power equipment from changing real-world power plants to consumers and the interconnections between power equipment in cyberspace, and create value in grid monitoring and control systems through Cyber Physical Systems (CPS).

Responsible Systems

  • Central power supply control center system
  • Centralized power supply monitoring and control system
  • Power distribution automation system
  • Grid stabilization system
  • Training simulator

Substation Monitoring and Control

Substation Monitoring and Control is a system for supplying stable power by directly capturing information from the substation’s equipment that raises and lowers the voltage in the process of supplying power from each power station to consumers, monitoring and controlling the equipment, and measuring the power value being transmitted.
It is also applied to substations for long-distance power transmission and DC power transmission that is suitable for power interchange between different frequency areas.
These facilities, such as substations and converter stations, are monitored 24 hours a day and contribute to a stable supply of electricity.

Business Overview

Development of Substation Monitoring and Control systems

We develop systems that capture and monitor in real time operation status, fault status, and electric quantity status of substation equipment that performs step-up and step-down of AC grids, and operate equipment during substation inspection and maintenance.

Development of DC power transmission monitoring and control systems (HVDC)

We develop systems for monitoring and controlling long-distance power transmission between Hokkaido and Honshu for the purpose of interregional power transfer in an emergency, and power conversion equipment suitable for DC power transmission at different frequencies between 50 Hz and 60 Hz.

Development of battery monitoring and control systems

Battery monitoring and control systems are indispensable to eliminate instability of supply due to fluctuations in power generation, which is a challenge for renewable energy generation. We develop systems that monitor the status of batteries and control charging and discharging according to the amount of power generated.

Responsible Systems

  • Substation Monitoring and Control systems
  • DC power transmission monitoring and control systems
  • Battery monitoring and control systems
  • Remote monitoring and control devices
  • Centralized monitoring and control devices
image:Substation Monitoring and Control

Grid Protection

For grid protection, we develop systems that instantly detect accidents (tens of milliseconds) and output a command to separate the accident section in order to minimize the impact of an accident such as a lightning strike on the power grid.
They are indispensable systems for stable power supply, and Japan’s low power outage rate has been achieved thanks to the correct functioning of these grid protection systems.
We have delivered a large number of products both domestically and internationally, contributing to the stable supply of electricity.

Business Overview

Development of grid protection systems

We develop grid protection systems, which are installed for each piece of power equipment such as generators, transmission lines, and transformers. They monitor the electricity flowing to each piece of power equipment in real time, and when an accident is detected, they output a command to disconnect the relevant section to minimize the impact of the accident.

Development of accident spread prevention systems

The balance between power demand and supply can become unbalanced due to the disconnection of power equipment resulting from system accidents, etc., and the impacts can spread across the grid. In order to minimize such impacts, we develop systems that detect frequency fluctuations and abnormal voltages.

Grid accident analysis

When a grid accident occurs, we analyze the accident to determine whether it is a simple event or a multiple event, the accident point, and the time until resolution. Grid analysis is performed based on the current and voltage data of the grid saved by the grid protection system at the time of the accident to determine the effectiveness of the grid protection system and equipment.

Responsible Systems

  • Grid protection systems
    Transmission line protection
    Power rail protection
    Transformer protection, etc.
  • Accident spread prevention systems
    Frequency relay systems
    Abnormal voltage detection relay systems, etc.
image:Grid Protection