Frequency Control Parameter Optimistic Method of Converter-interfaced Generation Considering Frequency Stability

Abstract

Aiming at the problem that the frequency control of the converter-interfaced generation only considers the large disturbance frequency index and causes frequency oscillation, in this paper, the frequency control of the converter-interfaced generation is analyzed regarding both the frequency index and the frequency oscillation. Firstly, the influence of the voltage source inertia control and the droop control on the system frequency stability is analyzed based on the lower order frequency model. On this basis, the response characteristics of the current source inertia control with time delay are studied. In the aspect of the frequency oscillation, the calculation of the value range of inertia control parameters that restrains the frequency oscillation is given. In the aspect of the frequency index, the current source inertia control has an optimal delay time to minimize the maximum frequency deviation. At the same time, the analytical calculation of the optimal delay is given and the relationship between the optimal delay and the system regulation parameters is analyzed. Relevant examples verify the correctness and effectiveness of the proposed method, and provide a theoretical basis for the selection of the inertial control parameters for the converter-interfaced generation.