Voltage Phase Angle Data Capture Using Triggered Transmission
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Solution Overview
Problem
Existing AC power grid systems struggle to efficiently capture voltage phase angle data in distribution and low-voltage systems due to the high-cost and resource-intensive requirements of high-reliability, high-bandwidth data transmission networks, which are not economically justified in these areas.
Innovation Solution
The method involves periodically measuring voltage phase angles relative to a timing reference signal, storing data locally, and transmitting only pre-trigger and post-trigger measurements in response to specific events detectable across multiple locations over a slower, less reliable data network, eliminating the need for expensive high-bandwidth connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-reliability, high-bandwidth data transmission connections are used to transmit voltage phase angle data in real-time, then measurement precision and reliability are improved, but device complexity and cost increase significantly
Solution Approach 1:
The system performs preliminary actions by storing voltage phase angle measurements locally at each PMU location before they are needed. The data is captured and buffered in advance, so when a trigger event occurs, the information is already available for immediate transmission without requiring continuous high-bandwidth real-time connections.
Solution Approach 2:
The invention extracts and transmits only the specific data elements that are actually needed - namely, voltage phase angle measurements surrounding trigger events. Instead of continuously transmitting all measurements, the system identifies and extracts only the relevant pre-trigger and post-trigger data for transmission, reducing communication requirements.
2Loss of information
If continuous real-time transmission of voltage phase angle measurements is implemented, then information availability is improved, but data transmission bandwidth requirements and costs increase
Solution Approach 1:
The system applies partial action by transmitting only a selective portion of the measured data - specifically, the pre-trigger and post-trigger measurements surrounding events of interest. This partial transmission approach maintains information availability for critical events while significantly reducing the overall data transmission bandwidth required compared to continuous real-time transmission of all measurements.
Solution Approach 2:
Measurements are captured and stored in advance (pre-trigger) so that when events occur, the data is already available locally. This preliminary capture eliminates the need for continuous high-bandwidth transmission, as only the stored relevant data needs to be transmitted when triggered.
3Adaptability or versatility
If PMUs are installed in distribution systems and low-voltage systems, then measurement coverage is improved, but economic feasibility deteriorates due to high infrastructure costs
Solution Approach 1:
The invention employs a simplified data transmission approach that uses less expensive communication infrastructure. By storing data locally and transmitting only when triggered, the system can operate over slower, lower-cost communication channels rather than requiring expensive high-reliability dedicated networks, making deployment in cost-sensitive distribution and low-voltage systems economically feasible.
Solution Approach 2:
The system performs preliminary data capture and local storage, which eliminates the need for expensive real-time high-bandwidth communication infrastructure. This approach allows PMUs to be deployed in distribution and low-voltage systems where cost is a concern, as the communication requirements are significantly reduced while still providing valuable measurement coverage.
Data Source
AI summary
A method and apparatus are provided for capturing voltage phase angle data on an alternating current power grid. The method includes periodically making a voltage phase angle measurement at each of a plurality of locations on the alternating current power grid relative to a timing reference signal (e.g., a GPS timing signal) that is available at each location. For each of the locations, the voltage phase angle measurements are stored locally at the location. A trigger event is selected that will be simultaneously detectable at two or more of the locations. The method includes monitoring for the trigger event at each of the plurality of locations. In response to detecting the trigger event at one or more of the locations, a select amount of pre-trigger and post-trigger measurements are transmitted over a data communications network to a pre-designated destination from each location at which the trigger event was detected.