Responsibility division method and device for multi-harmonic sources based on phase-free data
A technology of multi-harmonic sources and harmonic sources, applied in measuring devices, spectrum analysis/Fourier analysis, instruments, etc., can solve the problems of difficult acquisition of harmonic voltage and harmonic current phase information, failure of estimation methods, and reduction of estimation Accuracy and other issues, to achieve the effect of improving power quality, improving accuracy, and improving computing efficiency
Active Publication Date: 2021-07-20
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
[0006] In actual measurement, it is difficult to obtain the respective phase information of harmonic voltage and harmonic current, which will lead to the failure of existing estimation methods. If artificially constructed phase methods are used, such as random phase method and phase position zero method, although Avoid the failure of existing methods but the uncontrollable errors introduced thereby will reduce the estimation accuracy
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[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0064] see figure 1 , is a schematic flowchart of a multi-harmonic source responsibility division method based on non-phase data provided in Embodiment 1 of the present invention, including the following steps:
[0065] S1. Acquisition of the harmonic voltage at the common connection point PCC at each harmonic frequency in the system and the phase difference information between the harmonic voltages of each feeder, the amplitude of the harmonic current of each feed...
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The invention discloses a multi-harmonic source responsibility division method based on phase-free data, comprising: collecting the harmonic voltage at the common connection point PCC at each harmonic frequency in the system and the phase difference information between the harmonic voltages of each feeder line, The amplitude of the harmonic current of each feeder and the phase difference information between the harmonic currents of each feeder; calculate the active power and reactive power of each feeder at different harmonic frequencies; calculate the active power of each feeder in the system at the h-order harmonic frequency The sum of power and the sum of reactive power; estimate the total harmonic impedance of the system by partial least square method; calculate the contribution voltage of each feeder; calculate the harmonic responsibility of each feeder. The invention can improve the calculation accuracy and calculation efficiency of the harmonic parameters, thereby further improving the power quality, ensuring the safe operation of the power grid and the normal power consumption of power users. The invention also discloses a multi-harmonic source responsibility division device based on phase-free data.
Description
technical field [0001] The invention relates to the technical field of harmonic responsibility division in the field of power quality, in particular to a multi-harmonic source responsibility division method and device based on phase-free data. Background technique [0002] As power electronic devices and various non-linear, impact and asymmetrical loads are connected to the power grid, the harmonic problem of the power grid is becoming increasingly prominent. Harmonics can cause electromagnetic relay protection devices to malfunction or refuse to operate. Power equipment is affected by harmonics, resulting in greater additional loss, increased heat production, and shortened life. High-order harmonics increase the harmonic impedance of the line, and harmonics The current will cause the loss of the line to increase; in addition, the communication line will also be adversely affected by the existence of harmonics. [0003] The power quality problem caused by harmonic pollution...
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IPC IPC(8): G01R31/00G01R23/16
CPCG01R23/16G01R31/00
Inventor 刘桓瑞丁泽俊周福林杨飞帆
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD