Research on Under Frequency Load Shedding Method Considering Inertia Information

Abstract

With the transformation of energy system to low carbonization, the low inertia characteristics of high proportion of renewable energy and high proportion of power electronic equipment, which is, "double high bring serious challenges to the frequency security of the power system, and the traditional offline fixed under frequency load shedding (UFLS) will be more easily lead to overcutting phenomenon, which has an impact on the economy, so it is urgently needed to design a new inertia-adapted load shedding strategy to apply to the "double-high" grid. Therefore, there is an urgent need to design a noval load shedding strategy to adapt to the change of inertia to apply to the "double-high" grid.In view of this, this paper firstly analyzes the influence of inertia change on the system frequency and the effect of UFLS implementation. Moreover, an adaptive inertia change control scheme for UFLS system is designed to accomplish the boundary tunning with low inertia and the reasonable configuration of UFLS strategy.Finally, an adaptive low-inertia scenario under frequency load shedding scheme is proposed taking into account the main control elements of under frequency load shedding and its reasonableness and feasibility are verified by PSD-BPA simulation.