Hyper-model-based on-load tap-changer dynamic model hierarchy validation method
A dynamic model and an on-load tap technology, applied in the field of structural dynamics, can solve problems such as the jamming failure of the operating mechanism, the failure rate of the on-load tap changer, and the overheating and burning of the contacts.
Pending Publication Date: 2018-11-30
国网宁夏电力有限公司超高压公司 +2
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[0002] On-Load Tap Changer (OLTC) is the core component of the converter transformer to realize on-load voltage regulation. It can not only stabilize the load center voltage, but also connect to the power grid, adjust the load flow, and improve reactive power distribution, etc. Indispensable and important equipment, it bears huge mechanical and current shocks when it operates frequently, which leads to electrical or mechanical failures such as overheating and burning of contacts, loosening of fasteners, and jamming and failure of operating mechanisms during use. With the increasing application of converter transformers in the power grid, the incidence of on-load tap-changer failures also increases
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[0017] The modeling process of hypermodel in described step (1) (such as figure 2 shown) is
[0018] (1) Geometric model cleaning—check and clean the geometric model, eliminate errors generated during the geometric modeling process, and compatibility issues between geometric modeling software (such as UG) and finite element software (such as ANSYS), Ensure that the geometric model is consistent with design expectations and can be meshed;
[0019] (2) Initial model analysis - given a coarser grid size, the second-order tetrahedron element is used for finite element grid division, and the modal calculation under free-free boundary conditions is performed in the frequency range of interest;
[0020] (3) Mesh size iterative analysis - gradually refine the mesh size according to the uniform mesh size, and conduct correlation analysis between the mesh size model of the previous reference model and the current refined mesh model to determine the same mode shape Mode pair, analyze ...
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The invention discloses a hyper-model-based on-load tap-changer dynamic model hierarchy validation method. The method comprises the hyper model modeling technology, a finite element model simplifyingmethod, the sensitivity-based model correction technology, the connector modeling technology and a related analysis method. The method which uses high-precision hyper-model data as the reference dataand uses the hierarchy thought to perform dynamic modeling on the overall model of the tap-changer includes: building the hyper-models and simplified models of parts, and correcting the dynamic features of the part simplified initial finite element models according to the hyper-model data of the tap-changer parts to obtain validated part models; building the hyper-models of connectors to achieve the dynamic modeling of the validated part simplified model connectors, and correcting according to the connecting parameters among hyper-model data part simplified models of the connectors, and substituting the identified connecting parameters into the overall tap-changer model to perform dynamic analysis. The method provides reference for complex-structure dynamic model validation and is promising in application prospect.
Description
technical field [0001] The invention relates to the field of structural dynamics, in particular to a method for hierarchically confirming a dynamic model of an on-load tap changer based on a hypermodel. Background technique [0002] On-Load Tap Changer (OLTC) is the core component of the converter transformer to realize on-load voltage regulation. It can not only stabilize the load center voltage, but also connect to the power grid, adjust the load flow, and improve reactive power distribution, etc. Indispensable and important equipment, it bears huge mechanical and current shocks when it operates frequently, which leads to electrical or mechanical failures such as overheating and burning of contacts, loosening of fasteners, and jamming and failure of operating mechanisms during use. With the increasing application of converter transformers in the power grid, the incidence of on-load tap-changer failures also increases. According to statistics, the faults of domestic on-loa...
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IPC IPC(8): G06F17/50
CPCG06F2111/04G06F30/23G06F30/17G06F2119/06
Inventor 刘志远邹洪森宋永强刘青杨陈海军窦俊廷赵欣洋康真许涛张超
Owner 国网宁夏电力有限公司超高压公司