Optimal-design-based variable sampling rate re-sampling method

An optimized design and re-sampling technology, applied to electrical components, emergency protection circuit devices, etc., can solve the problem of out-of-synchronization of sampling data, and achieve the effect of low calculation amount and high calculation accuracy

Active Publication Date: 2015-02-18
STATE GRID ELECTRIC POWER RES INST +1
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Problems solved by technology

However, after the electronic current transformer is applied, the sampling frequency of each branch electronic transformer may be different, and the sampling frequency of the electronic transformer is inconsistent with the internal sampling rate set by the busbar protection device. Therefore, one of the main obstacles to the application of electronic current transformers in busbar differential protection is the synchronization of sampling data. It is necessary to convert all sampling data to the same sampling frequency for protection calculation.

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  • Optimal-design-based variable sampling rate re-sampling method
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  • Optimal-design-based variable sampling rate re-sampling method

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Embodiment Construction

[0022] According to above design principle, design anti-mirror filter, below in conjunction with 1000kV test demonstration engineering busbar three-phase short-circuit fault fault emulation current, CT strong saturation, the situation that three kinds of high-frequency components such as transformer air-drop exciting inrush current are very high make the present invention described in further detail.

[0023] 1) According to the above design principles of L and filter, test the input sampling data of the three-phase short-circuit fault of the busbar in the 1000kV test demonstration project, the fault simulation current, the CT strong saturation, and the transformer air-drop excitation inrush current, and the total resistance band The attenuation index is set at about -60 decibels, which can control the resampling error within 0.5%. Therefore, the total stopband attenuation index is taken as -60 decibels, and the interpolation multiple L should be calculated as 250 according to...

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Abstract

The invention discloses an optimal-design-based variable sampling rate re-sampling method, which comprises the following steps of: first over-sampling an input discrete signal, namely, performing L-fold interpolation on the input discrete signal by using an L-fold interpolation filter; then recovering the discrete signal into a continuous signal by using a zero-order holding filter; and finally re-sampling the continuous signal according to conversion requirements. The method has the advantages that: high calculation accuracy and lower calculated amount are ensured; the method is fully digital and discrete; only multiplication and addition operations are required, and typical digital signal processing convolution calculation is performed; the hardware accelerated calculation capability of a digital signal processor (DSP) can be fully utilized; and the various protected data re-sampling requirements are met.

Description

technical field [0001] The invention relates to an automatic control method of a power system, in particular to a resampling method with variable sampling rate based on optimal design. Background technique [0002] In modern microcomputer protection, especially after the application of electronic transformers, the problem of data synchronization has become the primary problem to be solved for many protections. For example, the longitudinal differential protection of transmission lines needs to solve the problem of data synchronization first; in addition, for busbar protection, differential protection of sampled values ​​is its main principle, and its characteristic is to use sampled values ​​to calculate the differential current point by point, requiring sampled data of all branch currents Strictly synchronized in time. However, after the electronic current transformer is applied, the sampling frequency of each branch electronic transformer may be different, and the samplin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22
Inventor 吴崇昊戴魏潘书燕
Owner STATE GRID ELECTRIC POWER RES INST
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