The current-temperature relationship of contact wire in high-speed railways is the key to the design of pantograph-catenary system and operational planning of electrified locomotives. The traditional researches on the...
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The current-temperature relationship of contact wire in high-speed railways is the key to the design of pantograph-catenary system and operational planning of electrified locomotives. The traditional researches on the current-temperature relationship of bare overhead conductors and model parameters mainly focus on aluminum conductor steel reinforced (ACSR), while the description of the heat balance process of contact wire is relatively lacking. In this paper, by optimizing the features of the existing models, an electrothermal coupling (ETC) model is established to describe the current-temperature relationship under different convection conditions. For the unknown parameters in this model, a parameter identification method based on the nonlinear primal-dual interior point algorithm is applied. The effectiveness of the parameter identification method and the ETC model is verified by the current-temperature experiment of contact wire under different current levels. The experimental results show that the root mean square error of the ETC model using identified parameters is only 1.22%, which demonstrates that the parameter identification method can effectively obtain the model parameters under natural convection. On this basis, a comparison shows that the root mean square error of the ETC model is 6.81% lower than that of the IEEE model, which demonstrates that the ETC model can describe the current-temperature relationship of contact wire under natural convection more accurately after parameter identification.
This paper presents the prototype of a direct dynamic optimization strategy to enhance the long term voltage stability. Based on the Quasi-steady-state model, the coordinated voltage control problem is presented by a ...
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ISBN:
(纸本)9781424465477
This paper presents the prototype of a direct dynamic optimization strategy to enhance the long term voltage stability. Based on the Quasi-steady-state model, the coordinated voltage control problem is presented by a differential-algebra optimization form. The dynamic optimization problem is transferred to a nonlinear programming model by approximating state variable, algebraic variable and control variable profiles based on a family of polynomials on finite time elements. nonlinearprimal-dualinteriorpoint method is applied to solve this nonlinear programming model. Filter line search method is used to compute the search step coupling with the Newton directions, larger steps may be accepted while the iteration approaches to the solution. This integrated strategy is tested on New England 10 generator 39 bus system and the simulation results show the potential for further extension on large scale optimization problems.
This paper presents the prototype of a direct dynamic optimization strategy to enhance the long term voltage stability. Based on the Quasi-steady-state model, the coordinated voltage control problem is presented by a ...
详细信息
ISBN:
(纸本)9781424465460
This paper presents the prototype of a direct dynamic optimization strategy to enhance the long term voltage stability. Based on the Quasi-steady-state model, the coordinated voltage control problem is presented by a differential-algebra optimization form. The dynamic optimization problem is transferred to a nonlinear programming model by approximating state variable, algebraic variable and control variable profiles based on a family of polynomials on finite time elements. nonlinearprimal-dualinteriorpoint method is applied to solve this nonlinear programming model. Filter line search method is used to compute the search step coupling with the Newton directions, larger steps may be accepted while the iteration approaches to the solution. This integrated strategy is tested on New England 10 generator 39 bus system and the simulation results show the potential for further extension on large scale optimization problems.
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