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With the development of renewable resources, large amounts of Distributed Generation (DG) units penetrated into distribution network. Instead of traditional passive PQ bus equivalence, DG characterized Active Distribution Network (ADN) need to be appropriate modeled as active components to represents its dynamic behaviors. Though existed ADN equivalent research considered the inverter-based DG units...
Direct drive for wind turbines is a relevant and challenging issue, hence they carry all of the advantages of gearless motion transmission. Nevertheless, they need customization for the housing of the position sensor. This sensor is often forced to work in hard, even extreme, environmental conditions, and it actually represents the most critical item for the drive reliability. In this case, the sensorless...
Power and energy supply has been faced with many challenges in the 21st century, accordingly the future development and innovation of power technologies is urgently needed. As a result of environmental pressures and energy shortage, human society needs to be powered by low-carbon or distributed sustainable energy, thus a conceptual smart grid with an originally created structure is brought forward...
Voltage vulnerability has been important in power system security research. Considering the characteristic that the voltage are mainly influenced by the reactive power, the potential energy margin which can embody the impacts from the reactive load, the reactive output of generator, the reactive compensation, and so on, was proposed as the benchmark, and then, the degree index and the trend index...
According to the integral theory of energy function, branch potential energy function model is constructed, and then two indexes are proposed: one is the current vulnerability, which quantifies the distance between the current transmitted power and initial transmitted power to identify the current vulnerable area, the other is the forecasting vulnerability, which is gained through computing the branch...
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