Abstract
Reliable, safe, efficient and environmental-friendly power supply ensures the favourable operation of the whole society. With the continuous increase of electricity consumption and with the sustainable development of distributed generation, comprehensive analysis of vulnerability of power grids has become urgent. This paper, based on complex network theory, studies failures on the transmission lines, which little research had been done on before, other than nodes. This paper proposes a new vulnerability assessment algorithm, considering two types of different stress that the power grid undergoes: the increase of electricity consumption and the fluctuations caused by distributed generation. This paper simulates IEEE 30-bus system and IEEE 118-bus system to prove this assessment algorithm efficient, and is different from typical research method using network attacks. It also shows that power grid vulnerability has negative correlation with network average degree. This paper shed new light on the vulnerability analysis of power grid based on complex network theory.
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