A time-varying harmonic impedance calculation method
By constructing the harmonic impedance variation equation and the background harmonic variance equation, and using matrix equations to solve the time-varying harmonic impedance, the problem of not considering the change of grid impedance in existing methods is solved, and accurate calculation under time-varying environment is achieved with the error controlled within 15%.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- STATE GRID ZHEJIANG ELECTRIC POWER CO LTD
- Filing Date
- 2022-11-08
- Publication Date
- 2026-06-19
AI Technical Summary
Existing methods for calculating harmonic impedance fail to effectively account for the time-varying nature of harmonic impedance in power grids, resulting in large errors in the calculation results, which has adverse effects, especially in medium- and high-voltage systems.
Using harmonic voltage and current data based on the point of common coupling, a harmonic impedance variation equation and a background harmonic variance equation are constructed. The time-varying harmonic impedance is solved by matrix equations, taking into account the effects of factors such as short-circuit faults and changes in power grid operation.
It achieves accurate calculation of harmonic impedance under time-varying conditions with an error controlled within 15%, which is superior to traditional methods and is applicable to medium- and high-voltage systems.
Smart Images
Figure CN116165442B_ABST