Abstract
Voltage sag has become one of the most serious power quality problems in modern power grid. Voltage sag risk assessment is an important prerequisite for implementing economic and efficient management of voltage sag. This paper presents a multi-dimensional evaluation method for voltage sag risk of regional grid sensitive enterprises. This method takes all of the operating sensitive enterprise as the object, from the perspective of the whole optimization of power grid service area, and gives full consideration to all the fault types of lines of different voltage levels, different ways of erection, as well as to the effects of voltage sag, balanced voltage sag electric load loss and sensitive enterprise economic losses. The multi-dimensional evaluation of voltage sag risk is implemented from the aspects of the voltage sag influence of line fault and the voltage sag risk of sensitive enterprises, which can guide the optimal operation of regional power grid, the differentiated operation and maintenance of lines and the optimal power supply of dual-power sensitive enterprises.
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