A review on high-frequency electromagnetic interference induced by power electronics in new electric power systems

The increasing penetration of PV power generation inevitably leads to the decline of system inertia, posing challenges to frequency stability. To this end, virtual inertia control has been proposed; however, it causes more fluctuations of system inertia. To address this issue, a novel equivalent inertia evaluation method for multiple PV power generation under virtual inertia control is proposed. The total system inertia is first estimated based on historical or injected disturbance. Then, the total inertia of multiple PV power generation is directly calculated by subtracting the inertia of synchronous generators from the estimated system inertia. To improve practicality, a partition-based strategy is introduced, which divides the system into regions characterized by homogeneous frequency response behaviors. After partitioning, only the synchronous generator data within the region and inter-area transmission line power are required for evaluation, reducing the demand for PMU data compared to traditional methods requiring measurements at each PV connection point. Comprehensive simulation results in a 10-machine 39-bus system penetrated with multiple PV power generation validated the effectiveness of the proposed method.