Abstract：The accuracy and the calculation speed of disturbance identification have a significant impact on the power equipment safety and power system stability. Until now, the purpose of most researches is to identify the type and location of disturbance. There is no method to identify the disturbance energy. However,the magnitude of disturbance energy reflects the impact of disturbance on power system. If the disturbance energy can be assessed online, the control strategy can be designed according to the disturbance energy. In this paper, the relationship between energy enthalpy and free energy in thermodynamics field is introduced into the description of disturbance free energy. For assessing the disturbance energy size, the free energy of the disturbance was defined to describe the energy transfer strength after the disturbance occurs. To take into account the effect of the initial injection energy of the generators, the free energy changes caused by different types of disturbances were analyzed respectively. And the disturbance free energy function was modified. Finally, the proposed theory was validated using the standard IEEE 39-bus and IEEE 118-bus system. The free energy sizes of different types and positions were analyzed. The relationship between the intensity of disturbance and the free energy was compared. The simulation results show that the disturbance free energy can describe the energy impact for the power system after the disturbance occurs. The proposed method laid the foundation for the control strategies based on the magnitude of disturbance energy.
秦骏达, 毕天姝. 基于自由能理论的电力系统扰动能量评估[J]. 电工技术学报, 2018, 33(3): 543-552.
Qin Junda, BiTianshu. Evaluation of Power System Disturbance EnergyBased on Free Energy Theory. Transactions of China Electrotechnical Society, 2018, 33(3): 543-552.
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2018, Vol. 33 
