Master Unit Control Notification for Power System Monitoring
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Solution Overview
Problem
Conventional control and monitoring systems for power systems face issues where the information used for judging controllability becomes outdated during control execution, leading to potential improper control and unnecessary multiple control operations among input/output terminal devices.
Innovation Solution
The master unit acquires the necessary information for judging controllability at the time of control object selection notification and sends a control object selection notification containing specifying information to both selected and non-selected input/output terminal devices, ensuring the information is up-to-date and preventing multiple control operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If information is collected before control object selection (conventional method 1), then control object can be selected based on available information, but the information becomes outdated by the time control is executed
Solution Approach 1:
The master unit sends control object selection notifications to all input/output terminal devices in advance, before determining which device will actually execute the control. This preliminary notification allows all devices to prepare and respond simultaneously, eliminating the time delay between information collection and control execution while ensuring information freshness.
2Object-generated harmful factors
If control object selection notification is sent only to selected input/output terminal device, then communication is minimized, but multiple control operations may occur simultaneously among non-selected devices
Solution Approach 1:
The master unit sends control object selection notifications to all input/output terminal devices, including non-selected ones. The non-selected devices receive the notification and proactively inhibit their control operations in advance, preventing multiple simultaneous control operations before they can occur. This approach increases communication traffic slightly but ensures system safety and prevents harmful multiple control actions.
3Reliability
If information collection is performed after control object selection (conventional method 2), then information is fresher, but control execution is delayed further
Solution Approach 1:
The master unit sends control object selection notifications to all input/output terminal devices in advance, before determining which device will execute the control. This allows all devices to collect and prepare their information simultaneously with the selection process, ensuring information freshness without delaying control execution. The parallel execution of notification and information collection eliminates the sequential delay inherent in conventional methods.
Data Source
AI summary
The object of the present invention is to make information necessary for judging whether control output is possible closer to the latest information than in the conventional method or made the latest, and shorten the time from control start to control execution. In a control and monitoring system for a power system which controls monitoring control objects by supplying a control instruction from a master unit 6 to a plurality of input/output terminal devices BCU1, BCU2, and so on provided for each of the plurality of monitoring control objects in a power system, the master unit 6 starts operations to acquire information necessary for judging whether control output to the input/output terminal devices BCU1, BCU2, and so on is possible at the time of control object selection notification from the master unit 6 to the input/output terminal devices BCU1, BCU2, and so on.