A method for determining the transformer taps in the initial operation of a chain power grid
A technology for transformer taps and determination methods, which is applied in the field of power systems and can solve problems such as less analysis of actual power grid characteristics
Active Publication Date: 2019-10-15
SOUTHERN XINJIANG ELECTRICITY SUPPLY COMPANY OF STATE GRID XINJIANG ELECTRIC POWER +2
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Problems solved by technology
[0004] At present, the literature focuses on the research on the transformer tap algorithm, and there are few analyzes on the characteristics of the actual power grid.
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[0052] Taking the library-A-Ba-Ka power transmission and transformation project in the southern Xinjiang power grid as an example, this principle is used to determine the location of its taps. This method is applied to the determination of the 750kV transformer taps of the Kuabaka power transmission and transformation project in the southern Xinjiang power grid, as follows:
[0053] Such as figure 2 As shown, it is estimated that from September to the end of 2015, the 750 kV Kuqa-Aksu-Bachu-Kashgar Power Transmission and Transformation Project will be put into operation. , 1,000 kilometers of 750 kV lines are all single lines, and the connection with the main network is weak. The transformers of the 750kV substations in southern Xinjiang are no-load tap-changing transformers. There are five taps to choose from on the 220kV side, that is, 220kV±2×2.5%.
[0054] The power grid in southern Xinjiang has long lines, light power flow, serious excess reactive power, and overvoltag...
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The invention relates to a chain type power grid initial stage operation transformer tap joint determination method and is applicable to a power grid in a chain type power grid finger radiation non-ring network wiring mode. The determination method comprises steps that according to two-side voltage control targets and an allowable operation scope, a voltage control target is determined; reactive compensation control strategies are evaluated in a large load mode and a small load mode; post-accident voltage verification is carried out; light power flow single-side trip overvoltage and heavy power flow N-1 low voltage are determined; voltage control measure evaluation in a maintenance mode is carried out; air charging line voltage control measure evaluation is carried out; the tap joint position is determined through comprehensively evaluating the large load mode, the small load mode, post-accident conditions, the maintenance mode and the air charging line voltage control strategies. The method is advantaged in that in combination with actual power grid operation characteristics, power grid voltage regulation characteristics are summarized, voltage regulation requirements of large load and small load operation modes are integrated, post-accident voltage control, air charging line operation and the maintenance mode are considered, the transformer tap joint determination principle is proposed, and tap joint position determination is carried out through applying the principle.
Description
technical field [0001] The invention relates to a method for determining a tap of a transformer in the field of electric power systems, in particular to a method for determining a tap of a transformer in the initial operation of a chain power grid. Background technique [0002] It is one of the main voltage regulation measures of the power grid to adjust the voltage by adjusting the transformer tap, that is, changing the transformer ratio. The adjustment range of the tap should be able to meet the requirements of the operating voltage, and the main function of the tap adjustment of the regulating transformer is to adjust the reactive power distribution. For the off-load voltage regulating transformer, since its taps are fixed, the position of its taps must meet the voltage regulation requirements of various operating conditions of the power grid. [0003] Generally, the principle of determining the tap is to determine the location of the tap based on a comprehensive analysi...
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IPC IPC(8): H02J3/12
Inventor 韩军朱国平彭龙李大立宋军王晓飞杨光宇朱洪伟潘艳
Owner SOUTHERN XINJIANG ELECTRICITY SUPPLY COMPANY OF STATE GRID XINJIANG ELECTRIC POWER