Power supply network harmonic suppression method and system capable of resisting impulse noise interference

Abstract

The invention discloses a power supply network harmonic suppression method and system capable of resisting impulse noise interference. On the basis of an active filter method, the self-sensing actuator principle is used for fusing a sensing part and an execution part together so as to enable the two parts to transmit information mutually, the defect that when errors occur in sensing signals, harmonic waves cannot be eliminated, or even the signals are worse can be overcome, and meanwhile, the harmonic suppression effect can also be improved; during updating of sub-harmonic weights, the RLS algorithm is adopted, therefore, the defect that step size factors are different to determine in the LMS algorithm is overcome, and the convergence rate is increased. Fractional lower order statistics-fractional lower order correlation (FLOC) is used for processing signals, so that the power supply network harmonic suppression method and system have a certain suppression effect on impulse noise interference. During frequency estimation, the PHD algorithm is used, implementation is simple, the calculated amount is low, a formula for calculating an autocorrelation matrix in the algorithm is improved according to an FLOC calculation method, the influence of impulse noise can be suppressed, and therefore frequency estimation is more accurate.

Description

technical field [0001] The invention relates to a method for suppressing harmonics of a power supply network, in particular to a method for suppressing harmonics capable of resisting impulse noise interference. Involving patent classification number H03 Basic electronic circuit H03D Demodulation or conversion of modulation from one carrier frequency to another carrier frequency H03D7 / 00 Modulation conversion from one carrier frequency to another carrier frequency, such as frequency conversion H03D7 / 16 Multiple frequency conversion . Background technique [0002] A power supply network is a network that connects power generating equipment and electrical equipment, and is used to transmit and distribute electrical energy to electrical equipment. In the power supply network, there are a large number of power electronic devices, such as switching power supplies, variable frequency speed regulation, thyristor rectifiers, etc. The power electronic devices in these devices mostly ...

AI Technical Summary

Problems solved by technology

Among them, the sensing part is separated from the execution part, both functionally and physically. If the sensing part is faulty or other reasons (the perceptron will introduce high-order harmonics under fault), the estimated result is wrong, then execute Some parts cannot produce correct results, and even make the signal worse, that is, when the perceived signal is wrong, the harmonics cannot be eliminated or even make the signal worse; in the actual system, the volume and weight of the components will be relatively large, in a certain It is not applicable in some technical fields with high requirements (such as aviation, aerospace, etc.); the influence of noise is not considered

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