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Abstract
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As the amount of new energy injected into the power system increases, the system inertia decreases and the spatio-temporal characteristics become apparent. Due to the uneven distribution of inertia in the power system, the dispersion of the frequency response after disturbance is more pronounced, and the inertia estimation error has a random nature when different frequency measurement points are selected. For the above problems, a method is proposed to select the frequency measurement point based on the centre of inertia. Firstly, based on the frequency dynamic response characteristics, the main influencing factors of the frequency distribution characteristics are studied and the spatial and temporal distribution characteristics of the frequency of the new energy power system are analyzed. Secondly, the method of frequency sampling through the centre of inertia is proposed with full consideration of the electrical distance and generator inertia constants. Finally, the simulation is carried out with a 10-machine, 39-node system as an example to verify the correctness of the above theoretical analysis, which provides a favourable basis for further improvement of inertia analysis and frequency control of power systems.
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