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A multi-period allocation method of multi-harmonic limit value in public power grid

A distribution method and public power grid technology, applied to the AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as waste of resources

Active Publication Date: 2018-12-14
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER +1
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Problems solved by technology

[0004] Taking into account factors such as harmonic impact, treatment cost and treatment effect, if the same evaluation method is used for all harmonic source users to evaluate harmonics, resources may be wasted

Method used

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  • A multi-period allocation method of multi-harmonic limit value in public power grid
  • A multi-period allocation method of multi-harmonic limit value in public power grid
  • A multi-period allocation method of multi-harmonic limit value in public power grid

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Embodiment Construction

[0052] The examples will be described in detail below in conjunction with the accompanying drawings. Such as figure 2 The specific flow chart of the multi-harmonic limit multi-period allocation method is as follows:

[0053] Step 1: Typical user volatility division.

[0054] Monitor the load lines in the power network for a week, obtain the voltage data, current data, and power data of typical users and public connection points (PCCs); draw active power daily load curves according to the measured active power, and divide them into peak load periods and trough periods, such as image 3 Active power daily load curve.

[0055] Step 101: Calculate the voltage fluctuation value of a typical user, the calculation steps are:

[0056] The formula for calculating the short-circuit capacity at the PCC is:

[0057]

[0058] Among them, I d is the short-circuit current at PCC, U N is the bus rated voltage, Z 0 is the equivalent impedance of the system, S d is the short-circui...

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Abstract

The invention relates to the technical field of evaluation on quality of electric power and particularly relates to a multi-harmonic-limit multi-period distribution method for a public grid. The method comprises the steps: (1) dividing users into users with relatively high fluctuation and users with relatively low fluctuation; (2) carrying out a harmonic limit distribution method while taking simultaneity factor into account; (3) carrying out a multi-harmonic-limit distribution method for the users with relatively low fluctuation; (4) carrying out a multi-harmonic-limit multi-period distribution method for the users with relatively high fluctuation. According to the method, on the premise of guaranteeing safe and reliable operation of power grids and the users, characteristics of the users of different harmonic sources are comprehensively considered; on the basis of dividing sizes of fluctuation of the users, load peaks and troughs of the public grid are taken into account, the limit to harmonic limit values is refined, and the multi-harmonic-limit multi-period distribution method for the public grid is provided, so that the harmonic limits of the public grid are more fairly and equitably distributed, and the reasonable evaluation on harmonics of the public grid is achieved.

Description

technical field [0001] The invention belongs to the technical field of power quality evaluation, and in particular relates to a multi-harmonic limit multi-period distribution method for a public power grid. Background technique [0002] At present, the main method for judging whether the grid harmonics exceed the standard is to use the 95% probability value of the measured value to judge according to the national standard limit. 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 Volatility users. Such as figure 1 Shown is the 3rd harmonic current value of a certain electric railway load on the grid side, the maximum value of the 3rd harmonic current value, the 99% probability maximum value (CP99), and the 95% probability maximum value (CP95) are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 王金浩吴玉龙雷达齐月文李胜文郭红龙李慧蓬宋述勇杨超颖徐龙张敏曹静杜慧杰王龙冯磊常潇杨赟磊张世峰肖莹刘翼肇逄燕王亚奇徐永海
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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