Optimal Control Method Based on Mechanical Ventilation Volume of Long Vertical Enclosed Busbar

Abstract

The invention discloses an optimal control method based on the mechanical ventilation volume of a long vertical closed busbar. The mechanical ventilation volume V in the long vertical closed busbar, the temperature difference ΔT between the inlet and outlet of the IPB, and the heat source intensity q satisfy the relational formula: V=a1+a2*ΔT+a3 *q+a4*ΔT2+a5*q2﹣a6q*ΔT, where: a1 is the first coefficient, a2 is the second coefficient, a3 is the third coefficient, a4 is the fourth coefficient, a5 is the fifth coefficient, a6 is the first coefficient Six coefficients. The invention verifies the result that the mechanical ventilation of the long vertical enclosed busbar (IPB) has the best ventilation rate under the condition of meeting the heat balance and temperature requirements through numerical calculation and on-site measured data. By optimizing the calculation of the mechanical ventilation volume, the temperature difference requirements can be guaranteed, and at the same time, the energy consumption of the selected ventilation equipment can be guaranteed to be the lowest, so as to achieve the purpose of energy saving. The research results of the optimized mechanical ventilation rate control method for long vertical closed busbars proposed by the present invention are of great significance for finding the optimal mechanical ventilation rate for the heat balance of IPB shafts and achieving energy saving and emission reduction under the premise of meeting the IPB operating environment.

Description

technical field [0001] The invention belongs to the electromechanical technical field of water conservancy and hydropower engineering, and specifically refers to an optimal control method based on the mechanical ventilation of a long vertical closed bus bar. Background technique [0002] The temperature distribution and heat dissipation of long vertical closed busbars in large underground power stations are the guarantee for the safe operation of busbars. With the rapid development of domestic hydropower projects, long vertical isolated phase-enclosed bus bars (IPB) are more and more widely used in underground hydropower stations. In the past, the main cooling method relied on natural ventilation. With the increase of the rated heat flow rate of the long vertical closed busbar of the underground power station and the complexity of the layout, whether natural ventilation alone still meets the heat balance requirements of IPB needs to be judged after specific calculations. Wh...

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Problems solved by technology

[0005] In order to solve the problem that the current large-scale underground power station IPB cannot fully meet the heat dissipation requirements by relying on natural convection, and how to correctly select the heat balance method and the optimal ventilation volume, the present invention provides a mechanical ventilation volume based on long vertical closed busbars that can quickly and accurately correct deviations. Optimal control method

[0007] V=a 1 +a 2 *ΔT+a 3 *q+a 4 *ΔT 2 +a 5 *q 2 +a 6 q*ΔT

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