Harmonic wave detection circuit of distribution system and harmonic wave detection method of harmonic wave detection circuit

Abstract

The invention discloses a harmonic wave detection circuit of a distribution system and a detection method of the harmonic wave detection circuit. The harmonic wave detection circuit comprises a power line L, a power line N, a transformer (1) and a power carrier wave module (2) and further comprises a voltage stabilizing module (3), an optical coupler (4), a sampling resistor R1, a triode V1, a reference voltage VCC and a power line communication module (5), wherein the voltage stabilizing module (3) is electrically connected with the power line L, the optical coupler (4) and the power line N, the sampling resistor R1 is connected in series with the power line L, b electrode of the triode V1 is electrically connected with the sampling resistor R1, an e electrode of the triode V1 is electrically connected with the sampling resistor R1, a c electrode of the triode V1 is electrically connected with the optical coupler (4), and the reference voltage VCC is separately electrically connected with the optical coupler (4) and an input end of the power carrier wave module (2). The detection circuit is advantaged in that power line carrier wave detection on the external network environment can be carried out, and a detection result is stored or sent out.

Description

technical field [0001] The invention relates to a harmonic detection circuit of a power distribution system and a detection method thereof. Background technique [0002] With the widespread popularization of smart energy meters, power line carrier technology is more and more widely used in power distribution systems. Power line carrier technology is a technology based on power lines to achieve communication. Power line carrier modules are based on power line carrier technology and use power lines as carriers for communication equipment , so in the actual application process, the power line carrier module is used together with the smart energy meter, but a harmful waveform will be parasitic on the power line, that is, the power line harmonic. The power line harmonic suppression module suppresses the power line harmonics in the intranet (the power line harmonics in the transformed power line) to avoid interference with communication signals, and the data interaction function o...

AI Technical Summary

Problems solved by technology

[0002] With the widespread popularization of smart energy meters, power line carrier technology is more and more widely used in power distribution systems. Power line carrier technology is a technology based on power lines to achieve communication. Power line carrier modules are based on power line carrier technology and use power lines as carriers for communication equipment , so in the actual application process, the power line carrier module is used together with the smart energy meter, but a harmful waveform will be parasitic on the power line, that is, the power line harmonic. The power line harmonic suppression module suppresses the power line harmonics in the intranet (the power line harmonics in the transformed power line) to avoid interference with communication signals, and the data interaction function of the power line carrier module will not be affected , that is to ensure the normal and smooth data interaction between the master station and the electric meter, but the existing power line carrier module used in the power distribution system cannot detect the power line harmonics in the external network (the power line harmonics in the power line before transformation) , the external network environment (external grid environment) cannot provide early warning, that is, it is impossible to judge whether the power line harmonics in the external network exceed the harmonics allowed by the national standard. If the value exceeds the normal range, it will endanger the smart energy meter, or even directly Cause damage to the smart energy meter, and at the same time, after some electrical equipment fails in the daily power environment, or is in an abnormal working state, a large number of harmonics will be radiated to the power line (that is, the harmonics of the internal network power line), and these harmonics will also endanger smart power. The meter may also directly cause damage to the smart energy meter. The situation we are facing now is that if the power line harmonics cause the smart energy meter to fail to work (damage, damage), it is impossible to judge whether it is caused by the external power grid environment or by some internal electrical appliances. caused by equipment failure

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