Abstract
The voltages on the AC overhead transmission lines (OTLs) can be calculated inversely based on the measured electric field around the lines, which will much contribute to the non-contact condition monitoring of OTLs. To more realistically simulate the actual operating state of OTLs in the wild, a refined catenary equation of OTL with consideration of the vertical suspension and horizontal deflection is established, and the according improved three-dimensional electric field mathematical model are proposed. Furthermore, the OTLs' voltages are calculated based on an improved optimization algorithm that combines particle swarm algorithm and genetic algorithm. Some simulation and experiment cases by setting different measurement errors and wind speeds are employed to verify the improving effect of the proposed model. The analysis results shown that the three-phase maximum amplitude error is 6.48% and maximum phase error is 6.26° when the electric field measuring error is as high as 20% (beyond the normal level); on the other hand, the maximum amplitude error and phase error are 2.54% and 0.96° respectively when the wind speed is set to the strong wind of 15m/s. The results demonstrate the accuracy and robustness of the proposed model.
Highlights
The amplitudes and phase-differences of three-phase voltages are the characteristic parameters for indicating the operating state of AC overhead transmission lines (OTLs)
The inverse calculation is regarded as a multi-objective optimization process embedded with OTLs’ electric field calculation, in which the measured electric field data are used as the input and the OTLs’ voltages are the target of optimization
The result based on the improved model shows much more accuracy than that based on the unimproved model in both simulation and experiment case, which indicates the promotion effect of proposed improved electric field calculation model
Summary
The amplitudes and phase-differences of three-phase voltages are the characteristic parameters for indicating the operating state of AC overhead transmission lines (OTLs). The inverse calculation is regarded as a multi-objective optimization process embedded with OTLs’ electric field calculation, in which the measured electric field data are used as the input and the OTLs’ voltages are the target of optimization This non-contact voltage measurement method has some self-evident advantages in safety and convenience [8]–[10], which would be much more useful for the on-line monitoring of OTLs’ operating state. To apply this new method in practical engineering, the accuracy and robustness of inverse calculation need to be improved.
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