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Steady-state harmonic wave analyzing method for line terminal synchronous measurement signal multi-bus micro-grid

A technology of synchronous measurement and harmonic analysis, applied in spectrum analysis/Fourier analysis, etc., can solve the problems of increasing equipment investment and achieve the effect of saving investment

Active Publication Date: 2015-04-22
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology

Therefore, it is necessary to install additional measuring devices on each busbar to measure the voltage and current signals of each busbar, and provide calculation data for the existing harmonic analysis method, which greatly increases equipment investment

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  • Steady-state harmonic wave analyzing method for line terminal synchronous measurement signal multi-bus micro-grid

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Embodiment Construction

[0016] The adopted technical solution will be further elaborated below according to the accompanying drawings.

[0017] like figure 1 As shown, the distributed power supply I S1 and I S2 The power source located at the end of the microgrid line, the existing microgrid is connected to the grid at S 1 point and s 2 The measurement devices are installed at all points, and the grid-connected point S can be obtained 1 point and s 2 The voltage and current synchronous signal of each point, using the FFT decomposition method or wavelet transform algorithm to calculate the fundamental wave of each point, the amplitude and initial phase of each harmonic voltage and current;

[0018] combined with S 1 The amplitude and initial phase of the voltage and current at the point and S 1 Point and its adjacent bus B 1 The line impedance Z between 1 , calculated using Kirchhoff's laws and S 1 point adjacent bus B 1 voltage phasor; combined with S 2 The amplitude and initial phase of ...

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Abstract

The invention relates to a steady-state harmonic wave analyzing method for a line terminal synchronous measurement signal multi-bus micro-grid. The fact of additionally installing detecting devices on all buses of the micro-grid is avoided and a large amount of investment is saved. The steady-state harmonic wave analyzing method comprises the steps of collecting voltage and current synchronous signals of a micro-grid line terminal detecting point and obtaining line impedance information between the detecting point and a bus adjacent to the detecting point; according to obtained amplitude and initial phase of the voltage and current synchronous signals and by combining the impedance information between the line terminal detecting point and the bus adjacent to the line terminal detecting point, calculating the voltage phasor of the bus adjacent to the line terminal detecting point by the utilization of the Kirchhoff law; by combining voltage phasors of two adjacent buses and line impedance information between the buses, calculating the current phasor in a bus connecting line according to the Ohm law; by combining the voltage and current phasors of all the buses, obtaining effective values of fundamental waves and all sub-harmonic waves and calculating the harmonic wave situations of all the buses by the utilization of the calculation formula of harmonic wave voltage ratio, harmonic wave current ratio, voltage harmonic wave total distortion rate, and current harmonic wave total distortion rate.

Description

technical field [0001] The invention relates to a method for analyzing the steady-state harmonics of a micro-grid, in particular to a method for analyzing the steady-state harmonics of a multi-bus micro-grid for synchronous measurement signals at line ends. Background technique [0002] As a part of the large power grid, the voltage and current provided by the microgrid should ideally be sinusoidal AC with very few harmonics. However, with the use of various rectifiers containing nonlinear electrical components such as semiconductors, large-capacity frequency converters, large-scale AC-DC converters, and other power electronic devices, and the use of nonlinear materials such as arcs and ferromagnetic materials With the increase of equipment, a large number of harmonics are injected into the grid. The generation of harmonics is a kind of pollution to the power quality of the microgrid, which reduces the quality of power supply, and at the same time brings harm to the safety,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
Inventor 程艳孙树敏高峰丁广乾李广磊毛庆波张用
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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