Power line communication signal filtering method and system

Abstract

The invention relates to a power line communication signal filtering method and system, and relates to the technical field of power systems. The method comprises the following steps: determining a signal difference sequence by utilizing difference values of elements in a real-time power line communication signal sequence; determining an expected sequence by using the power line communication signal sequence and the signal difference sequence; determining a Lagrange function matrix by using the signal difference sequence and the expected sequence; determining a Lagrange factor vector by using the Lagrange function matrix; determining a Lagrange optimal matrix by using the Lagrange function matrix and the Lagrange factor vector; and filtering the power line communication signal sequence by using the Lagrange optimal matrix to obtain a filtered signal sequence. According to the method, the Lagrange factor vector is introduced, the Lagrange optimal matrix is determined by using the Lagrange function matrix and the Lagrange factor vector, and the Lagrange optimal matrix is used for filtering the power line communication signal sequence, so that the pulse noise in the PLC signal is effectively filtered.

Description

technical field [0001] The present invention relates to the technical field of power systems, in particular to a power line communication signal filtering method and system. Background technique [0002] Compared with various wired communication technologies, Power Line Communications (PLC) has the advantages of no need for rewiring and easy networking, and has broad application prospects. The power line communication technology is divided into narrowband power line communication (Narrowband over power line, NPL) and broadband power line communication (Broadband over power line, BPL). Narrowband power line communication refers to the power line carrier communication technology with a bandwidth limited to 3kHz to 500kHz, including the specified bandwidth (3 to 148.5kHz) of the European Committee for Electrotechnical Standardization (CENELEC) and the regulations of the US Federal Communications Commission (FCC). Bandwidth (9-490kHz), Japan's Association of Radio Industries an...

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Problems solved by technology

[0004] With the application and popularization of non-linear electrical appliances (such as juice machines using motors, coffee machines, soybean milk machines, etc.), more and more impulse noises appear in PLC communication signals. The instantaneous power of such noises is very large, showing It has obvious non-stationary and non-Gaussian characteristics, but the commonly used low-pass filter does not perform well in filtering out impulse noise, which seriously affects the performance of the PLC communication system

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