A multi-limit evaluation method of harmonic pollution degree considering the effect of treatment
A technology of harmonic pollution and degree, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, AC network circuits, etc.
Active Publication Date: 2019-09-17
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER +1
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However, for some harmonic source users, although there are exceeding standards, if the exceeding time is short, considering the economy and necessity of harmonic control, it can also be considered that the harmonic excess is not serious, and treatment can be ignored
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[0036] The examples will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following descriptions are only illustrative, and not intended to limit the scope and application of the present invention.
[0037] The specific implementation process of the multi-limit value evaluation method for the harmonic pollution degree of the public power grid provided by the present invention, figure 1 It is a specific block diagram of the multi-limit evaluation method for the harmonic pollution degree of the public power grid, specifically:
[0038] Step 1: Use the power quality monitoring device to monitor the harmonics of the load line of the public power grid for a working cycle, and obtain harmonic current data and harmonic voltage data;
[0039] Step 2: Division of harmonic fluctuations.
[0040]Utilize the relative fluctuation coefficient index AFI proposed by the present invention to measure the degree of harmonic fluctuation...
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The invention belongs to the technical field of power quality evaluation, and particularly relates to a harmonic pollution level multi-limit evaluation method considering a control effect. The harmonic pollution level multi-limit evaluation method comprises the steps of collecting harmonic current data and harmonic voltage data of one work cycle; dividing harmonic fluctuation levels; performing harmonic pollution level multi-limit evaluation. According to the harmonic pollution level multi-limit evaluation method, the defect of high harmonic control cost caused by harsh conclusion because a uniform limit standard is used for different harmonic source users during harmonic pollution level evaluation at present is overcome; for the harmonic evaluation of the harmonic source users with different harmonic characteristics, according to the principle of exact demands and moderate relaxation, a big probability value of 99%, a big probability value of 95%, a big probability value of 90%, a big probability value of 80% and a big probability value of 70% of harmonic current are compared with a harmonic current limit, and the total harmonic distortion of voltage of points of common coupling is combined, so that different severity levels of the harmonic pollution level and the suggestion whether control measures need to be taken are given.
Description
technical field [0001] The invention belongs to the technical field of electric energy quality evaluation, and in particular relates to a multi-limit value evaluation method for harmonic pollution degree considering control effect. Background technique [0002] At present, the method of evaluating whether the harmonics of the public grid exceed the standard is mainly to use the 95% probability value of the measured value and evaluate it according to the national standard limit. [0003] However, the harmonic distribution characteristics of harmonic source users in the public power grid are quite different. Some users have small harmonic changes in the work cycle, which is a relatively stable user; some users have large harmonic changes in the work cycle, which is Volatile users, such as electrified railways, have large harmonic changes in the working cycle, and are fluctuating users. For the harmonic pollution assessment of fluctuating users and relatively stable users, gen...
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IPC IPC(8): H02J3/01
CPCH02J3/01H02J2203/20Y02E40/40
Inventor 王金浩雷达李胜文侯少健徐龙张敏吴玉龙杨超颖李慧蓬杜慧杰弭勇赵旭伟王龙张世峰常潇杨赟磊肖莹王锬逄燕王亚奇徐永海
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER