Method for selecting gears of ultrahigh-voltage main transformer tap of chained power grid
A chain grid, ultra-high voltage technology, applied in the field of power systems, can solve problems such as difficulty in gear selection
Pending Publication Date: 2020-09-22
STATE GRID XINJIANG ELECTRIC POWER CORP +1
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for gear selection of ultra-high voltage main transformer taps in chain-type power grids, and to solve the difficulty in selecting gears without ultra-high voltage main transformer taps in the prior art technical problem
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Embodiment
[0168] The present invention verifies the correctness of the method based on the specific implementation cases of the power grid in this area, which mainly includes calculating the voltage pass rate of the typical operation mode of the power grid in this area under different gear combinations of the main transformer taps of the three 750kV substations in Aksu, Shache, and Hotan , Overhaul mode voltage pass rate, voltage pass rate after accident, voltage fluctuation, reactive power exchange index. Its specific implementation process is as follows:
[0169] Using PSD-BPA power system simulation calculation software, taking Xinjiang southern power grid as an example, the correctness of the method is verified. The result of the southern Xinjiang power grid is a long-chain power grid. The temperature difference between day and night in southern Xinjiang is large, and the load fluctuation is more obvious. Under the small load and new energy generation mode, the southern Xinjiang pow...
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The invention discloses a method for selecting gears of an ultrahigh-voltage main transformer tap of a chained power grid. The method comprises the following steps: analyzing evaluation indexes of gear selection of the main transformer tap of an ultrahigh-voltage substation of the chained power grid; calculating the weight of each evaluation index by adopting a plurality of evaluation methods, andoptimally combining the weights of the evaluation indexes calculated by adopting the plurality of evaluation methods by adopting a moment estimation theory to obtain a comprehensive evaluation indexweight; and calculating comprehensive index evaluation results of power grid operation under the position combination of the main transformer taps of the ultrahigh-voltage transformer substations, sorting the comprehensive index evaluation results, and selecting an optimal gear of the ultrahigh-voltage main transformer tap. According to the method, the optimal main transformer tap position can beselected according to the comprehensive index evaluation sorting result, and the method has important reference value for selection of the chain type power grid ultrahigh-voltage main transformer tapposition.
Description
technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a method for selecting gears of tap joints of ultra-high voltage main transformers in chain-type power grids. Background technique [0002] By adjusting the transformer taps, the reactive power distribution of the system can be adjusted, and then the voltage level of the grid can be adjusted. For the chained grid with weak network connections in the early stage of grid construction, the voltage regulation effect of transformer taps is more obvious. At present, most of the main transformers of ultra-high voltage substations in my country use off-load voltage regulating transformers. Since the taps are fixed, the location of the taps needs to meet the voltage regulation requirements of various operating conditions of the power grid. Therefore, the gear selection of the ultra-high voltage main transformer tap is a problem worth studying. [0003] The sele...
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Login to View More IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06
Inventor 亢朋朋赵伯铉杨桂兴张文朝孙谊媊杨俊炜郭小龙王衡樊国伟宋朋飞印欣
Owner STATE GRID XINJIANG ELECTRIC POWER CORP