924 / 2019-04-30 17:00:06

A Method of Power Grid Frequency Gradient Aided Control Based on Rotational Inertia of Power Grid

Index Terms—Frequency stability, under-frequency load shedding scheme，over-frequency generator-shedding, respond speed

Abstract—In the frequency control measures of power grid in our country, when the power grid suffers from large-scale load or power shortage, it is necessary to adopt frequency determination measures such as over-frequency generator-shedding or under-frequency load shedding, the response time is slow and the ability of the power system resilience is reduced. There is a lack of flexible control method for frequency gradient changing with time. Therefore, this paper proposes a frequency gradient control method based on grid inertia to form a frequency gradient early warning control matrix under different start-up modes. When the grid suffers from large-scale power shortage, it can quickly implement over-frequency generator-shedding or under-frequency load shedding measures to reduce frequency offset and improve the ability of the power system resilience.