Abstract
Power system controlled islanding is an emergency control to stop the propagation of disturbances and to avoid blackouts. This paper presents a three-stage method for intentional controlled islanding of power systems. It enables to search out reasonable islanding cutsets, which have the minimum load-generation imbalance or the minimal power flow disruption, without low-voltage problems. In the first stage, a self-adaptive graph simplification algorithm is proposed to obtain a two-terminal graph as a suitable islanding cutset search area from the original power network graph model. In the second stage, an islanding cutset search algorithm is designed to find all of islanding cutsets, including the minimum load-generation imbalance cutset, in the two-terminal graph. In the third stage, an islanding scheme checking algorithm is developed to examine the outputs of stage two. It uses the depth first search algorithm to determine reasonable islanding cutsets without low-voltage problems. The IEEE 30-bus system and the IEEE 118-bus system are utilized to demonstrate the proposed method. The simulation results show its validity and accuracy in large-scale power systems.
Highlights
Since 1990, the modern electricity market has expanded in several countries
Reference [19] employs a power flow tracing method to determine the domain of each group of coherent generators, and it aims to split the network along the boundaries of groups that may miss some reasonable islanding cutsets
Derive the simplified two-terminal graph based on power flow tracing method and graph theory
Summary
Since 1990, the modern electricity market has expanded in several countries. A great number of power systems operate close to their limits due to severe economic stresses. Reference [19] employs a power flow tracing method to determine the domain of each group of coherent generators, and it aims to split the network along the boundaries of groups that may miss some reasonable islanding cutsets. A three-stage method for intentional islanding of power systems is proposed to avoid the above mentioned problems The aim of this method is to find islanding cutsets with the minimal load-generation imbalance or the minimal power flow disruption for any given number of islands, while ensuring that each island follows the voltage limit constraint. A self-adaptive graph simplification algorithm is proposed in stage one This algorithm, which matches various operating conditions and network configurations, can automatically determine the islanding cutset search area in different power systems.
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