Electric energy quality monitoring device

Abstract

The invention discloses an electric energy quality monitoring device. The electric energy quality monitoring device comprises a signal acquisition circuit, a signal conditioning circuit, a control circuit and a man-machine interaction circuit. The signal acquisition circuit located at the front end adopts a voltage transformer or a current transformer and a resistance circuit to convert voltage or current signals, the signals are processed and then sent to the signal conditioning circuit with an operational amplifier as a main component, the voltage or current signals with appropriate amplitude are obtained through conversion, then the signals are sent to the control circuit composed of a single-chip microcomputer STM32F405 to be calculated and displayed, and the man-machine interaction circuit adopts an LM240120BCW liquid crystal display module to display the fundamental current and voltage, the harmonic current and voltage and the fundamental power value which are measured at present. The electric energy quality monitoring device not only can effectively monitor the electric energy quality, but also has low power consumption and reasonable processing speed.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a power quality monitoring device. Background technique [0002] With the increasing demand for electricity, a large number of various power electronic devices are connected to the power grid, causing problems such as harmonics, voltage fluctuations and voltage flicker in the power grid, which seriously affect the safety and stability of the power system. Equipment is also affected by the power quality of the power system. In addition, the current general distributed generation technology will also affect the power supply quality of the power system. For example, random changes in distributed power generation will cause power quality problems such as voltage fluctuations and voltage flicker, and bring new challenges to the stable operation of the power system. . Therefore, the monitoring of the power quality of the power grid is particularly important, and the development...

AI Technical Summary

Problems solved by technology

[0003] At present, most traditional power quality monitoring devices are designed and implemented based on 8-bit or 16-bit single-chip microcomputers, which have disadvantages such as slow processing speed and imperfect hardware structure.

In order to overcome this shortcoming, some power quality monitoring devices use DSP processors. Although the processing speed is fast and the precision is high, the cost is high and the power consumption is too large.

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