Abstract
Voltage sags and swells are significant issues of power quality. In order to alleviate voltage sags and swells on sensitive loads, a method is proposed to evaluate the bus and grid structure based on voltage sags/swells using voltage ellipse parameters. The voltage matrix is established for voltage sags/swells caused by four types of short-circuit faults. The voltage matrix can be converted into a minor axis matrix and a major axis matrix using the Clarke transformation, and accordingly a voltage sag matrix and a voltage swell matrix can be obtained with the interaction between voltage sags/swells and voltage ellipse parameters. The key indicator and the vulnerability indicator of bus as well as the indicator of grid structure are defined according to the voltage sag matrix and swell matrix. The buses are sorted using the indicators proposed, and the result of bus sorting provides a basis for selecting the buses that need to be managed to alleviate voltage sags/swells. The experiment results in IEEE 30-bus system and IEEE 57-bus system show that these indicators facilitate the selection of the access point for newly-added sensitive loads, and provide a theoretical guidance to the mitigation of voltage sags and swells, and help to accomplish the planning, operation and transformation of power grid.
Highlights
With the increasing proportion of the sensitive load in industrial load, the problems caused by voltage sags and swells are gradually complicated
The key indicator of bus based on the influence level QBi can reflect the degree of harm to the load caused by voltage sags/swells.this paper proposes the corresponding grid structure indicator by using the key indicator of bus based on the influence level
In order to reduce the impact of bus faults on sensitive loads, the sensitive loads on bus 12 should be transferred to the bus with lower vulnerability indicator
Summary
With the increasing proportion of the sensitive load in industrial load, the problems caused by voltage sags and swells are gradually complicated. A method for evaluating the bus and grid structure based on the voltage sags/swells is needed to provide decision-making guidance for the selection of sensitive load access points and power grid planning and reconstruction considering power quality. The buses are sorted using the key indicator based on influence level, and the result of bus sorting provides a basis for selecting the buses that need to be managed to alleviate voltage sags/swells. (3) This paper proposes the indicator of grid structure considering the impact of voltage sags/swells on sensitive loads, which can provide reference for grid planning, operation and transformation. Voltage swell influence level indicator of bus i when bus i has x-type short circuit fault
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