On-line electric energy quality monitoring device

Abstract

The invention discloses an on-line electric energy quality monitoring device. A hardware platform is an embedded hardware platform and is in a complex structure consisting of a Power PC (Personal Computer) functional unit, an FPGA (Field Programmable Gate Array) functional unit and a DSP (Digital Signal Processing) functional unit, wherein the Power PC functional unit is independent of the DSP functional unit; and data interaction is performed between the Power PC functional unit and the DSP functional unit through a double-port RAM (Random Access Memory) configured in the FPGA functional unit. The conventional normal electric energy quality device has a high-speed transient signal acquisition function by only increasing limited cost. The on-line electric energy quality monitoring device is widely applied to nonlinear load and impact load, including on-line monitoring of conventional electric energy quality index parameters at places with more serious transient interference such as equipment connection and lightning strike on a power grid; and when a high-speed voltage transient abnormal event occurs, the current transient signal can be automatically acquired and truly and completely recorded, and basis support is provided for failure analysis of devices and equipment on a power supply line.

Description

technical field [0001] The invention relates to electric energy measurement, in particular to an on-line electric energy quality monitoring device. Background technique [0002] Non-linear loads and impact loads of the power system, including transient disturbances such as the connection of equipment on the power grid and lightning strikes, and the operation of reactive loads on the same circuit at the user site, often cause damage to devices and equipment connected to the line. serious damage. Since the duration of transient interference is much shorter than the 20ms power supply cycle, and the transient voltage is several times or even dozens of times the rated voltage of the power system, the sampling rate of the existing power quality device is 128, 256 points / cycle, and the measurement range is narrow. Even if the sampling rate is 512 points / cycle, its transient capture ability can only reach about 80 μs, so it is often impossible to collect transient signals or to tru...

AI Technical Summary

Problems solved by technology

[0002] Non-linear loads and impact loads of the power system, including transient disturbances such as the connection of equipment on the power grid and lightning strikes, and the operation of reactive loads on the same circuit at the user site, often cause damage to devices and equipment connected to the line. serious damage

Since the duration of transient interference is much shorter than the 20ms power supply cycle, and the transient voltage is several times or even dozens of times the rated voltage of the power system, the sampling rate of the existing power quality device is 128, 256 points / cycle, and the measurement range is narrow. Even if the sampling rate is 512 points / cycle, its transient capture ability can only reach about 80μs, so it is often impossible to collect transient signals or to truly and completely record the transient signals at that time

If the power quality device uses a high sampling rate throughout the whole process, it is unnecessary to monitor and analyze conventional power quality indicators such as voltage deviation, frequency deviation, harmonics, flicker, unbalance, etc., and its software implementation is too difficult, and hardware costs also too high

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