Considering the escalating usage of renewa-ble energy and rising frequency of extreme meteorological events,the risk of emergency load shedding(ELS)in power grids due to faults is increasing.The existing ELS strategie...Considering the escalating usage of renewa-ble energy and rising frequency of extreme meteorological events,the risk of emergency load shedding(ELS)in power grids due to faults is increasing.The existing ELS strategies fail to provide users with advance warnings and blackout preparation time.To address this issue,an in-novative strategy called warning and delayed load shed-ding is proposed in this study.In this approach,when it becomes necessary to shed load for emergency control,users are immediately notified with a power outage warning.Subsequently,energy storage and other regula-tory resources are employed to substitute for load shed-ding,thus postponing the execution of the load shedding command.This delay equips users with the ability and time to respond and prepare.To implement this strategy,the operational principles supported by energy storage and backup power are further discussed.Five perfor-mance indexes are utilized to evaluate the delayed load shedding capability.Moreover,the delayed load shedding switch function and energy storage power balance equa-tion are constructed to determine the relationship be-tween energy storage,backup power sources,and load shedding time.Subsequently,two optimized load shed-ding models supported by energy storage are established,i.e.,maximum and flexible delayed models.For compar-ison,improvements are made to the conventional load shedding model without delay by incorporating energy storage.An IEEE 30-node network with energy storage is used to test the three load shedding models.Accordingly,the evaluation indexes are calculated and compared.The results of the performance indexes and comparative analysis validate the effectiveness of the proposed meth-ods,indicating that by using energy storage,users can be notified with advance power outage warnings and prep-aration time.展开更多
基金supported by the National Natural Sci-ence Foundation of China(No.52077017).
文摘Considering the escalating usage of renewa-ble energy and rising frequency of extreme meteorological events,the risk of emergency load shedding(ELS)in power grids due to faults is increasing.The existing ELS strategies fail to provide users with advance warnings and blackout preparation time.To address this issue,an in-novative strategy called warning and delayed load shed-ding is proposed in this study.In this approach,when it becomes necessary to shed load for emergency control,users are immediately notified with a power outage warning.Subsequently,energy storage and other regula-tory resources are employed to substitute for load shed-ding,thus postponing the execution of the load shedding command.This delay equips users with the ability and time to respond and prepare.To implement this strategy,the operational principles supported by energy storage and backup power are further discussed.Five perfor-mance indexes are utilized to evaluate the delayed load shedding capability.Moreover,the delayed load shedding switch function and energy storage power balance equa-tion are constructed to determine the relationship be-tween energy storage,backup power sources,and load shedding time.Subsequently,two optimized load shed-ding models supported by energy storage are established,i.e.,maximum and flexible delayed models.For compar-ison,improvements are made to the conventional load shedding model without delay by incorporating energy storage.An IEEE 30-node network with energy storage is used to test the three load shedding models.Accordingly,the evaluation indexes are calculated and compared.The results of the performance indexes and comparative analysis validate the effectiveness of the proposed meth-ods,indicating that by using energy storage,users can be notified with advance power outage warnings and prep-aration time.
