A new adaptive load shedding control strategy based on the transient voltage disturbance scale detection in power systems

Conventional load shedding control strategy adjusts undervoltage load shedding and underfrequency load shedding respectively, and undervoltage load shedding only focuses on local voltages without consideration on characters of transient voltage responses. This paper analyses the relationship between the disturbance scale and transient voltage drops, thus proposing a novel index for the disturbance scale detection of transient voltages based on the offset of voltage drops. From this index, the transient voltage disturbance can be divided into the partial-grid transient voltage disturbance and the whole-grid transient voltage disturbance. Considering frequency and voltage dynamics during the disturbance, this paper provides a new adaptive load shedding control strategy based on the transient voltage disturbance scale detection. This strategy solves the partial-grid transient voltage disturbance and the whole-grid transient voltage disturbance respectively with two adaptive load shedding schemes. The effectiveness and superiority of this strategy are verified by simulations on the IEEE 39-bus system.