Nonlinear load electric energy metering device

Abstract

The invention discloses a nonlinear load electric energy metering device which comprises a voltage sensing and conditioning unit, a voltage RC filter circuit, a current sensing and conditioning circuit, a current RC filter circuit, an ADC analog-digital converter and a data processing and managing unit. Voltage signals are transmitted to the ADC analog-digital converter through the voltage sensing and conditioning unit and the voltage RC filter circuit. Current signals are transmitted to the ADC analog-digital converter through the current sensing and conditioning circuit and the current RC filter circuit. The ADC analog-digital converter carries out conversion on the received voltage signals and the current signals and transmits the voltage signals and the current signals to the data processing and managing unit. The nonlinear load electric energy metering device achieves the advantages that metering signal transmission distortion does not occur and work is stable and reliable in the conditions that impact load is wide in frequency band and large in dynamic range.

Description

technical field [0001] The invention relates to the field of electric energy metering devices, in particular to a non-linear load electric energy metering device. Background technique [0002] With the rapid development of power electronics technology, the proportion of nonlinear loads is gradually increasing, and nonlinear problems are becoming increasingly prominent in power grids. This type of load has obvious impact characteristics. During production or operation, it will take fast-changing power from the power supply network. The instantaneous peak value of power may be several times or even dozens of times its average value. This type of load is collectively referred to as Shock load. Currently, no special means are used to measure the electric energy of impact load users, and ordinary ammeters are still used, which is difficult to reflect the actual energy consumed by the impact load, and the pollution of the load to the grid is also lacking in monitoring and evaluat...

AI Technical Summary

Problems solved by technology

Currently, no special means are used to measure the electric energy of impact load users, and ordinary electric meters are still used, which is difficult to reflect the actual energy consumed by the impact load, and the pollution of the load to the power grid is also lack of monitoring and evaluation

[0003] Most of the current electric energy metering devices are based on the traditional sinusoidal power theory. When the grid load is mainly linear load and the distortion and fluctuation of the line waveform are small, the traditional electric energy metering device can achieve accurate metering.

[0004] Harmonic watt-hour meters can also be used, which can measure the energy consumption and energy flow direction of each harmonic (such as 0~63 times), but the harmonic watt-hour meter also has limitations, and the harmonic watt-hour meter is more effective for steady-state harmonic analysis , but there is no effective detection method for the dynamic and transient process reflected in the impact load operation

Images