An Adaptive Synchronized Phasor Measurement Method for Distribution Network
A distribution network and synchronous phase technology, applied to the phase angle between voltage and current, measuring electrical variables, measuring devices, etc., can solve problems such as low accuracy
Active Publication Date: 2020-04-17
TSINGHUA UNIV
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[0004] The purpose of the present invention is to propose an adaptive synchrophasor measurement method for distribution networks to solve the problem of low accuracy caused by out-of-band interference components in the calculation process of distribution network synchrophasors, and at the same time improve the performance in dynamic changing scenarios. The response speed of the synchrophasor calculation results under
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[0080] The self-adaptive synchronized phasor measurement method of the distribution network proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:
[0081] (1) Gathering the voltage or current signal of the distribution network, including the following steps:
[0082] (1-1) Collect the voltage or current signal of the distribution network at a time interval T, and record the sampling data of the first 10 cycles of the current sampling data point as X;
[0083] (1-2) Take the 4 cycle data before the current sampling data point in the sampling data X, denoted as X s , the number of sampled data is denoted as N 1, number the sampling data respectively -K 1 ,-(K 1 -1),...,0,1,...,(K 1 -1), K 1 ;
[0084] (1-3) Take the 2 cycle data before the current sampling data point in the sampling data X, denoted as X d , the number of sampled data is denoted as N 2 , number the sampling data respectively -K 2 ,-(K 2 -1),...,0...
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The invention relates to an adaptive synchronous phasor measuring method of a power distribution network and belongs to the technical field of synchronous phasor measuring of power distribution networks of electric power systems. The adaptive synchronous phasor measuring method comprises the steps that firstly, a four-cycle steady finite impulse response filter and a two-cycle dynamic finite impulse response filter are designed, both of the two filters consider out-of-band interference components difficult to filter near the base frequency, and the central frequency has the online adjusting capability; and secondly, based on a modern spectrum estimation method, ten-cycle signal sampling values are utilized to analyze frequency components of signals, then according to a designed transient recognition method, the transient variation process of the signals from a steady state to a dynamic state is recognized in real time, and a steady synchronous phasor calculating result and a dynamic synchronous phasor calculating result are selectively output. According to the designed synchronous phasor measuring method, the problem of low precision caused by the out-of-band interference components in the synchronous phasor calculating process of the power distribution network can be solved, and meanwhile, the response speed of the synchronous phasor calculating results in the dynamic variation scene is increased.
Description
technical field [0001] The invention relates to an adaptive synchronized phasor measurement method for a distribution network, and belongs to the technical field of synchronized phasor measurement for a power system distribution network. Background technique [0002] With the massive access of nonlinear loads, electric vehicles and distributed new energy sources with converters to the distribution network, a large number of harmonics and interharmonics are introduced; in addition, since the distribution network is located at the user side of the grid, it is affected The dynamic behavior of various electric loads is greatly affected; the high-frequency noise interference problem of the distribution network is also very serious, all of which pose new challenges for the high-precision calculation of synchronized phasors based on high-frequency discrete sampling. [0003] At present, the synchrophasor calculation methods of transmission network can be mainly divided into two cat...
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IPC IPC(8): G01R25/00G01R23/165
CPCG01R23/165G01R25/00
Inventor 王印峰陆超李依泽熊春晖
Owner TSINGHUA UNIV