Harmonic detecting method based on adaptive neuronal on-line setting
A harmonic detection and neuron technology, which is applied to measurement devices, measurement of electrical variables, frequency measurement devices, etc. The effect of improving real-time computing performance
Inactive Publication Date: 2008-04-23
SHANGHAI JIAOTONG UNIV
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However, there are still obvious defects in this method, that is, there is a mutual restrictive relationship between detection accuracy and speed performance: if in order to maintain the high precision of harmonic calculation, the calculation convergence speed is very slow; if the detection speed is increased, the calculation accuracy will be significantly reduced, Therefore, it is difficult for this method to achieve the best calculation speed and accuracy at the same time.
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[0016] Provide following embodiment in conjunction with content of the present invention:
[0017] Such as figure 1 As shown, the input is the current signal i s and the voltage signal u s , the main calculation process is the multiplication and integration of voltage and current signals in the figure, i sh is the harmonic component of the calculated output. At the same time, the weight and integration of the current signal, and the online tuning calculation of the learning rate η: the weight initial value and the integral control module control the restart of the integration process, and the optimization of the initial value of the integration; and the learning rate tuning module controls Optimization of the learning rate η. In the entire calculation process, the calculation parameters in the main process are optimized according to the real-time status of the current to achieve the best effect of calculation speed and accuracy.
[0018] Taking the square wave with severe...
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The present invention relates to a harmonic detection method based on adaptive neuro on-line setting, which is used in the field of current signal processing technology. Using voltage as reference input, using load current as original input, utilizing real-time operation to output the signal whose active component amplitude and phase are identical to that of load current basic wave, deducting said signal from load current to obtain the total sum of harmonic and reactive current component; at the same time, in order to raise speed and aaccuracy of calculation on-line setting learning rate and integration link; utilizing data window analysis of sampling value of harmonic current to judge that the harmonic wave is produced or not or suddenly-changed, in the initial stage of detection or under the condition of current sudden-change firstly, taking large value of leaning rate, then taking smaller value; utilizing weighted value theoretical calculating formula to calculate the estimative value of initial value of weighted value so as to utilize optimized initial value to again make integration.
Description
technical field [0001] The invention relates to an accurate and fast detection method of harmonic and reactive current components, in particular to a harmonic detection method based on adaptive neuron online tuning, which is used in the technical field of current signal processing. Background technique [0002] With the improvement of power system automation and informatization, many advanced equipment have appeared, such as active power filter, static var compensator and dynamic voltage restorer. The detection of wave and reactive current is the key to the whole scheme. Whether it can quickly and accurately detect the components to be compensated and have good dynamic tracking performance determines the working performance of the entire automation device. [0003] Harmonic and reactive current detection methods generally include: (1) FFT method based on frequency domain analysis, which is characterized by slow speed, poor detection effect on high-order harmonics, and inabil...
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IPC IPC(8): G01R23/09G01R23/00
Inventor 王冲陈陈解大
Owner SHANGHAI JIAOTONG UNIV