Disturbance Source Positioning in Power Grids
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Solution Overview
Problem
Current methods for determining the position of a forced power oscillation disturbance source in regional interconnected power grids are inefficient, particularly in real-time monitoring and accuracy, due to complex calculations and interference from periodic components.
Innovation Solution
A method that calculates the algebraic sum of energy flow direction factors in a regional interconnected power grid using Prony analysis and wide-area measurement systems (WAMS) to quickly identify the disturbance source, reducing the influence of periodic components and simplifying calculations for real-time computing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to determine disturbance source position, then measurement coverage is comprehensive, but calculation complexity increases and real-time identification accuracy decreases
Solution Approach 1:
The patent extracts and removes periodic components from the energy flow direction factor calculations. By identifying and eliminating these periodic interference components through spectral analysis, the method isolates the true disturbance source signal from noisy measurements, thereby improving identification accuracy without requiring overly complex filtering systems
Solution Approach 2:
The patent transforms the measurement parameters by calculating energy flow direction factors instead of directly using raw power flow measurements. This parameter transformation converts complex multi-dimensional measurement data into simplified directional indicators that point toward the disturbance source, reducing calculation complexity while maintaining high accuracy
2Measurement precision
If complex calculation methods are applied to eliminate periodic components, then identification accuracy improves, but computing time increases
Solution Approach 1:
The patent utilizes periodic action by analyzing the periodic components at the fundamental frequency and its harmonics. By recognizing that power system measurements naturally contain periodic components at known frequencies, the method applies frequency-domain analysis techniques that efficiently extract disturbance information from periodic patterns without requiring exhaustive time-domain computations
Solution Approach 2:
The patent substitutes mechanical/time-domain filtering methods with frequency-domain spectral analysis. Instead of using complex temporal filtering algorithms to remove periodic components, the method transforms measurements into the frequency domain where periodic components appear as distinct spectral lines that can be easily identified and eliminated through simple algebraic operations
3Speed
If real-time monitoring is implemented across the entire grid, then disturbance detection speed improves, but system complexity and computational burden increase
Solution Approach 1:
The patent introduces energy flow direction factors as intermediary quantities that mediate between raw measurement data and disturbance source identification. These intermediate factors serve as simplified representations that capture essential directional information about power flow changes, enabling rapid disturbance localization without processing all raw measurement data in real-time
Solution Approach 2:
The patent segments the complex grid-wide monitoring problem into localized measurements at specific buses. By calculating energy flow direction factors individually at each measurement point and then synthesizing the results, the method achieves comprehensive grid monitoring through simple local calculations rather than complex centralized processing
Data Source
AI summary
Disclosed is a method for determining a position of a forced power oscillation disturbance source in a regional interconnected power grid. According to the method, when forced power oscillation occurs in a regional power grid, an algebraic sum of energy flow directional factors in the regions of the regional interconnected power grid is calculated so as to online determine the position of the disturbance source in real-time. Compared with the conventional disturbance source positioning method based on an energy function, the disturbance source positioning method based on calculation of the energy flow directional factors provided by the invention can reduce the impact of a periodic disturbance component and an initial constant on the determination of an aperiodic component of branch potential energy, thus achieving higher accuracy. Moreover, the integration links are reduced and the calculation process is simplified, thus better meeting the requirements for real-time power grid calculation.