Harmonic measurement method and system of power system
A power system and harmonic technology, applied in the field of electric power, can solve the problems of complex hardware structure, high cost and complicated synchronous sampling operation of the hardware system, and achieve the effect of improving the harmonic measurement efficiency and the measurement speed.
Active Publication Date: 2017-05-31
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Fast Fourier transform has high computational efficiency, but fast Fourier transform requires synchronous sampling of signals. Synchronous sampling of high-performance signals is generally realized through hardware systems. The hardware structure of hardware systems is complex, resulting in complicated synchronous sampling operations and high cost. high
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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0030] Although the steps in the present invention are arranged with labels, they are not used to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a certain step requires other steps as a basis, the relative order of the steps can be adjusted.
[0031] see figure 1 , figure 1 It is a schematic flowchart of the first embodiment of the method for measuring harmonics in a power system according to the present invention.
[0032] The harmonic measurement method of the power system of this embodiment may include the following steps:
[0033] Step S101,...
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The invention discloses a method and a system for measuring harmonics of a power system. The method comprises the following steps of synchronously sampling power signals to generate a synchronous data sequence; enabling the length of the synchronous data sequence in a unit fundamental wave cycle to be equivalent with the unit time length, and generating equivalent fundamental wave frequency; multiplying the synchronous data sequence by a preset window function data sequence, and to generate a window data sequence; performing multiple integer calculation on the window data sequence to generate the equivalent harmonics frequency amplitude; obtaining the ratio of the equivalent harmonics frequency amplitude and the equivalent fundamental wave frequency amplitude, so as to measure the harmonics. The method and the system can improve the harmonic measuring speed.
Description
technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for measuring harmonics of a power system. Background technique [0002] The measurement of power harmonics is of great significance to the power system. Fast Fourier transform and window function are the basic mathematical calculation methods to realize the calculation of power harmonics. Fast Fourier transform has high computational efficiency, but fast Fourier transform requires synchronous sampling of signals. Synchronous sampling of high-performance signals is generally realized by hardware systems. The hardware structure of hardware systems is complex, resulting in complicated synchronous sampling operations and high cost. high. Contents of the invention [0003] Based on this, it is necessary to provide a harmonic measurement method and system for a power system in view of the above technical problems. [0004] A method for measuring harmoni...
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IPC IPC(8): G01R23/16
Inventor 李军万文军庞志强任娟娟史玲玲
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID