A measurement method for digital electric energy in smart substations

Abstract

The present invention is a metering method for digitized electric energy in smart substations. The steps are as follows: 1) Perform packet loss compensation and coarse data elimination sequentially on the digital signals of voltage and current sent by the merging unit in the smart substation; 2) According to the processed The instantaneous power is obtained from the voltage and current signals, and n continuous points are intercepted from the obtained instantaneous power and multiplied by the coefficient of the Blackman convolution window function to obtain the average power; 3) According to the obtained average power, the smart substation is obtained by time integration Digitalized electric energy, and at the same time, the average power is P / F transformed into electric energy pulses and then output to obtain the measurement value of digitalized electric energy in smart substations. By using the convolution window function to low-pass filter the instantaneous power, the FIR low-pass filter can be used to accurately measure the electric energy, and at the same time, the data sent by the merging unit is compensated for packet loss and coarse data is eliminated, reducing the impact of asynchronous sampling. The influence of spectrum leakage.

Description

technical field [0001] The invention relates to the monitoring field of power system equipment, and is used for electric energy metering of intelligent substations, in particular to a metering method for digital electric energy of intelligent substations. Background technique [0002] At present, the construction of smart grid has risen to the national level, and the smart substation is an important foundation and support for the construction of smart grid. The main advantages of smart substations are reflected in the following aspects: digitalization of process equipment, the introduction of new devices such as electronic transformers and intelligent terminals for merging units; networked information transmission, mainly IEC61850 protocol and network communication technology. This means that the information interaction between the substation process layer equipment and the bay layer equipment has undergone a major change. The application of electronic transformers and inte...

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Problems solved by technology

However, because the written program is not very perfect, it is still possible to introduce certain errors in the program algorithm

On the other hand, the digital electric energy meter virtual instrument directly obtains the input waveform data (digital quantity) of the electronic transformer, and does not directly sense and collect the analog voltage and current. There may also be some error introduced

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