A Power Grid Waveform Detection Method Based on Operational Amplifier Circuit

Abstract

The invention discloses a power grid waveform detection method based on operational amplifier circuits. A detection circuit is adopted to be matched with detection. An operational amplifier circuit is adopted to convert the sine wave of a power grid into a synchronous square wave, so that the period value of the power grid is obtained. After that, another operational amplifier circuit is adopted to compress the power grid. The sampling is conducted according to a preset sampling point number N through the AD sampling port of a main control chip and a sampling period value is obtained at the same time. The square wave is captured by an input capturing interruption circuit. When a moment appears at a rising edge, the moment is represented as the zero crossing point of the power grid. A sampling point at the current moment is sent to a sampling window as a first sampling start point through the AD sampling port. After that, the sampling of N points is conducted according to the sampling period value and the sampling point value of each point covers the sampling point value of the previous sampling operation within the sampling window. In this way, the start point of a periodic waveform in the sampling window each time is ensured to be the zero crossing point. Meanwhile, the number of the sampling points in the sampling window is always N and the waveform is always synchronous.

Description

technical field [0001] The invention relates to grid waveform detection, in particular to a grid waveform detection method based on an operational amplifier circuit. Background technique [0002] In recent years, with the increasing maturity of household energy storage system technology, clean, convenient and intelligent electricity has been sent to thousands of households. However, different users are in different grid environments, and the quality of the grid directly affects whether the energy storage system can bring clean and healthy energy to users. For example, the increase of the harmonic content of the power grid will shorten the life of electrical equipment, or even damage it, increase the network loss, and increase the possibility of harmonic resonance in the system. At the same time, it may cause relay protection and automatic device malfunction, instrument indication and power A series of problems such as inaccurate measurement and interference in communication...

AI Technical Summary

Problems solved by technology

However, different users are in different grid environments, and the quality of the grid directly affects whether the energy storage system can bring clean and healthy energy to users

For example, the increase in the harmonic content of the power grid will lead to shortened life of electrical equipment, or even damage, increased network loss, and increased possibility of harmonic resonance in the system. At the same time, it may cause relay protection and automatic device malfunction, instrument indication and power A series of problems such as inaccurate measurement and communication interference

If the quality of the power grid is poor, and the user installs a household energy storage system, the life of the electrical equipment will be shortened or even damaged due to the poor quality of the power grid, and the energy storage system will also collapse, causing irreparable losses. Therefore, a safe and reliable , Automated grid waveform detection method to monitor the health index of the grid

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