Power System Stability Monitoring for PCS Parallel-Off Fault Screening
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Solution Overview
Problem
Conventional stability monitoring devices face increased calculation times and excessive power supply restrictions due to the growing number of PCS power supplies, which are not accounted for in existing severity calculations, leading to prolonged calculation periods and potential system instability.
Innovation Solution
A stability monitoring device that includes a simple stability calculation unit, a severity indicator calculation unit, a PCS power supply severe parallel-off condition extracting unit, and a detailed stability calculation unit, which calculates angular velocities and internal phase angles to identify and prioritize fault cases with high severity indicators, thereby narrowing down the number of detailed stability calculations to only severe combinations of PCS power supply parallel-offs and continuous operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed stability calculation is performed for all fault cases, then stability determination accuracy is improved, but calculation time becomes excessively long
Solution Approach 1:
The fault case analysis is divided into two segments: simple stability calculation for all fault cases to generate severity indicators, and detailed stability calculation only for high-severity cases. This segmentation allows the system to maintain accuracy for critical cases while reducing overall calculation time by excluding low-severity cases from computationally intensive detailed analysis.
Solution Approach 2:
The system changes the parameter of calculation depth based on the severity indicator value. For fault cases with high severity indicators, detailed stability calculation is performed; for cases with low severity indicators, only simple stability calculation is performed. This parameter-based differentiation resolves the contradiction by adapting calculation resources to actual system needs.
2Quantity of substance
If the number of PCS power supplies increases, then power supply capacity is improved, but the number of fault cases to be analyzed increases exponentially
Solution Approach 1:
The system extracts only the high-severity fault cases from the complete set of fault cases using severity indicators. By taking out only the critical cases that require detailed analysis, the system avoids the exponential growth in computational complexity while maintaining the ability to handle increased power supply capacity through selective focus on problematic configurations.
3Productivity
If simple stability calculation is used to narrow down fault cases, then calculation speed is improved, but accuracy of stability determination may be reduced
Solution Approach 1:
The system performs preliminary simple stability calculation for all fault cases to generate severity indicators before conducting detailed stability calculation. This preliminary action filters out low-severity cases, ensuring that detailed analysis is applied only where necessary, thus maintaining accuracy while improving overall calculation speed.
Solution Approach 2:
The severity indicator serves as an intermediary between simple stability calculation and detailed stability calculation. It mediates the transition by identifying which cases require detailed analysis, ensuring that accuracy is maintained for critical cases while allowing speed improvements for non-critical cases.
Data Source
AI summary
A power system stability monitoring device comprising: a simple stability calculation unit that calculates the angular velocity and internal phase angle of a generator in each fault case based on fault conditions and the system configuration of the power system; a severity indicator calculation unit that calculates a severity indicator that represents the degree of system instability based on the angular velocity and internal phase angle; a PCS power supply severe parallel-off condition extracting unit that calculates a PCS power supply parallel-off severity indicator based on a parallel-off sensitivity indicator representing a degree of influence of PCS power supply parallel-off on the degree of instability and the severity indicator, and that extracts fault cases where the parallel-off severity indicator exceeds a prescribed threshold; and a detailed stability calculation unit that performs a detailed stability calculation for each extracted fault case based on the severity indicator or parallel-off severity indicator.