Frequency Support Demand Analysis of High Non-synchronous Resource Penetration Receiving-end Power Grid Based on System Frequency Response Model

Abstract

With the increase in the scale of external High Voltage Direct Current (HVDC) transmission and renewable energy power generation in the receiving-end power grid, the problem of frequency stability has gradually become prominent. This paper analyzes and studies the frequency support demand of the receiving-end power grid for the typical scenario that the power shortage caused by the HVDC blocking fault causes the system frequency to drop. Firstly, the System Frequency Response (SFR) model of the receiving-end power grid is constructed, and the trajectory sensitivity analysis of the model parameters is carried out to clarify the influence of each parameter on the frequency at different stages of frequency response process. Then, the improved SFR model considering non-synchronous resource penetration is established, the analysis method of inertia and primary frequency regulation demand of the receiving-end power grid is proposed. Finally, the applicability of the proposed method is verified by a simulation example of East China power grid.