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Simplified interpolation algorithm for improving electric energy quality analysis precision of digital transformer station

A power quality analysis and interpolation algorithm technology, applied in the measurement of electrical variables, complex mathematical operations, measurement of electricity and other directions, can solve the problems of large harmonic analysis errors, low sampling rate, and reduce the accuracy and reliability of monitoring results. Effects of improved accuracy, reduced time, fence effects and spectral aliasing suppression

Active Publication Date: 2018-06-08
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, the photoelectric / electronic transformer + merging unit sampling mode used in the existing intelligent substation has problems such as low sampling rate and large harmonic analysis error, which affects the accuracy of monitoring and reduces the accuracy and reliability of monitoring results. sex

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  • Simplified interpolation algorithm for improving electric energy quality analysis precision of digital transformer station
  • Simplified interpolation algorithm for improving electric energy quality analysis precision of digital transformer station
  • Simplified interpolation algorithm for improving electric energy quality analysis precision of digital transformer station

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Embodiment Construction

[0026] The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0027] figure 1 Shown is a schematic flow chart of one embodiment of the simplified interpolation algorithm for improving the accuracy of digital substation power quality analysis in the present invention. The algorithm includes the following steps:

[0028] Apply the three-moment method to solve the three-spline interpolation function, and use the second derivative M i As interpolation coefficients, establish with respect to M by equality of first derivatives and boundary conditions i The system of equations, the three-spline interpolation function is obtained as follows:

[0029]

[0030] where x i and y i Represent the position and size of the i-th sampling point, h i =x i -x i-1 Indicates the distance between adjacent sampled data (that is, the node interval). It can be seen from the abov...

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Abstract

The invention provides a simplified interpolation algorithm for improving the electric energy quality analysis precision of a digital transformer station. A three-batten interpolation algorithm is applied to expansion of electric energy quality monitoring sampling data of the intelligent transformer station, the three-batten interpolation algorithm is simplified on the basis of sampling characteristics to solve the problem that the three-batten interpolation algorithm is slow in calculation and needs relatively long time, and equally-spaced characteristics are used to simplify a calculation process and reduce calculation parameters; virtual sampling points are added to satisfy periodic requirements of three-batten interpolation, and a boundary condition calculation process is simplified; and a three-diagonal linear equation serves as a simplified batten equation, an equation set is solved in a chasing method, and calculation steps are reduced. The electric energy quality analysis precision of the intelligent transformer station can be improved, and the defects of complex calculation and long solving time of the traditional three-batten interpolation algorithm can be overcome.

Description

technical field [0001] The invention relates to the fields of on-line monitoring and sampling data processing of electric power systems, in particular to a simplified interpolation algorithm for improving the analysis accuracy of power quality in digital substations. Background technique [0002] There are a large number of non-linear, impact and fluctuating loads in the power system. These loads cause power quality problems such as waveform distortion (harmonics), voltage fluctuations, and three-phase imbalances in the power grid, which have caused great damage to the normal operation of sensitive loads. impact, resulting in huge economic losses. To improve the power quality of the power grid, it is first necessary to accurately detect and analyze the power quality, measure the power quality level of the power grid, analyze and judge the causes of various power quality problems, and provide a basis for power quality improvement. However, the photoelectric / electronic transf...

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Application Information

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IPC IPC(8): G01R31/00G06F17/12
CPCG01R31/00G06F17/12
Inventor 李伟丁凯钱一民陈乔王易王晋李鹏宿磊
Owner STATE GRID CORP OF CHINA
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