Harmonic injection quantitative analytical method for multiple nonlinear users
A technique of harmonic injection and quantitative analysis, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc.
Active Publication Date: 2012-02-01
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD SHAOXING POWER SUPPLY CO +2
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[0007] The purpose of the present invention is to provide a multi-nonlinear user harmonic injection quantitative analysis method, based on multi-nonlinear user reverse harmonic power (including reverse harmonic active power, reverse harmonic reactive power, reverse harmonic Apparent electric energy) metering data, quantitative statistics of the harmonic injection ratio of each nonlinear user to the grid, and based on this quantitative ratio for harmonic control cost allocation; used for fast and accurate quantitative analysis of harmonics of multiple nonlinear users in engineering applications The amount of wave injection is used to solve the problem of how to quantify the pollution of the power grid by multiple nonlinear users in a fair and reasonable manner
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[0016]
[0017] A method for quantitative analysis of multi-nonlinear user harmonic injection in this embodiment, such as figure 1 As shown, the following steps are included: 1) According to the reverse harmonic active energy of a single nonlinear user , reverse harmonic reactive energy , reverse harmonic apparent energy , using the formula ; ; ; Calculate the cumulative reverse harmonic active energy of a single nonlinear user , Accumulated reverse harmonic reactive energy , Cumulative reverse harmonic apparent electric energy , where in the above formula, m represents the harmonic order, and the value ranges from 2 to 50, k refers to one of the nonlinear users, and P, Q, and S represent active power, reactive power, and apparent power respectively; 2) According to each Accumulated reverse harmonic active energy of non-linear users , Accumulated reverse harmonic reactive energy , Cumulative reverse harmonic apparent electric energy , using the f...
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The invention discloses a harmonic injection quantitative analytical method for a plurality of nonlinear users, and the harmonic injection quantitative analytical method comprises the following steps of: according to the reverse harmonic electric energy of the single nonlinear user at each time, calculating to obtain the accumulative reverse harmonic electric energy of the single nonlinear user; according to the accumulative reverse harmonic electric energy of each nonlinear user, calculating to obtain the accumulative reverse harmonic electric energy of the plurality of nonlinear users at a PCC (point of common coupling); according to the accumulative reverse harmonic electric energy of each nonlinear user and the accumulative reverse harmonic electric energy of the plurality of nonlinear users at the PCC, calculating to obtain the harmonic injection quantitative proportion of each nonlinear user; and directly carrying out pollution quantification and the allocation of administrativeexpense in the harmonic centralized administration of a transformer substation by utilizing the harmonic injection quantitative proportion of each nonlinear user. The harmonic injection quantitative analytical method can be used for quickly, accurately and quantitatively analyzing the harmonic injection amounts of the plurality of nonlinear users in engineering applications, and solves the problem how the pollution of the plurality of users to an electric network is fairly and reasonably quantified.
Description
[0001] technical field [0002] The invention relates to a quantitative analysis method for multi-nonlinear user harmonic injection, which belongs to the technical field of electric automation. Background technique [0003] With the development of the power system, more and more non-linear electrical equipment and converter equipment in electrified railways, metallurgy, textiles and other industries in the public grid have been put into use. Harmonic voltages are generated in the grid. The harmonic voltage and harmonic current are superimposed on the fundamental voltage and current, which will cause waveform distortion of the fundamental signal which is originally a sine wave. Harmonics can also cause inductive loads in the public power grid to generate overvoltages and capacitive loads to generate overcurrents, which will pose hazards to power equipment and affect the safe operation of power systems. In addition, harmonics will also affect the accuracy of electric ener...
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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 秋勇李电陈晓宇刘宁王昕杨昊睿
Owner STATE GRID ZHEJIANG ELECTRIC POWER CO LTD SHAOXING POWER SUPPLY CO