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Harmonic source positioning and harmonic responsibility division method applied to active distribution network

A technology of active distribution network, harmonic source, applied in directions such as fault location

Inactive Publication Date: 2015-09-09
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0004] Regarding the division of harmonic responsibilities, domestic and foreign scholars’ research is based on the joint responsibility of users and power suppliers, aiming to distinguish the harmonic responsibilities on both sides of the point common coupling (PCC), but a large number of facts have proved that power distribution There is more than one nonlinear load in the distribution network, therefore, the voltage waveform distortion of each node is not caused by only one nonlinear load, but is the result of the joint action of all nonlinear loads in the distribution network

Method used

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  • Harmonic source positioning and harmonic responsibility division method applied to active distribution network
  • Harmonic source positioning and harmonic responsibility division method applied to active distribution network
  • Harmonic source positioning and harmonic responsibility division method applied to active distribution network

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Embodiment Construction

[0032] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0033] A harmonic source location and harmonic responsibility division method applied to the active distribution network, ignoring the characteristics of power bidirectional flow in the active distribution network, using the characteristic that the equivalent impedance of the harmonic source changes periodically with time to locate the harmonic Wave source, and then quantitatively divide the harmonic responsibility by calculating the harmonic contribution of each harmonic source on the specified bus. Such as figure 1 shown, including the following steps:

[0034] Step 1. Obtain the voltage and current of the common coupling point:

[0035] Collect the voltage and current at the common coupling point, as shown in Table 1, at least one cycle is collected, and the sampling interval can be taken as 1% of the cycle. The shorter the sampling interval, ...

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Abstract

The present invention relates to a harmonic source positioning and harmonic responsibility division method applied to an active distribution network. The main technical feature is that the method comprises a step of collecting the voltage and current of a common coupling point, a step of drawing the time-domain curve of an equivalent impedance and obtaining a harmonic source location, a step of obtaining the data needed by a harmonic impedance, and a step of calculating the harmonic mutual impedance between a concerned bus and each harmonic source and dividing harmonic responsibilities. The design of the method is reasonable, through establishing a load time-domain equivalent model, by using the physical relation of the voltage and current on a common coupling point, a parameter identification method is used to position the harmonic source in the active distribution network, through analyzing the bus harmonic voltage acted by all harmonic sources in the active distribution network and calculating the harmonic mutual impedance between the bus and the node where the harmonic source is to recognize the contribution of each harmonic source, and thereby a harmonic contribution standard measure is used to divide the responsibility of each harmonic source.

Description

technical field [0001] The invention belongs to the technical field of active distribution networks, and in particular relates to a harmonic source location and harmonic responsibility division method applied to active distribution networks. Background technique [0002] With the access of a large number of distributed generation (Distributed Generation, DG) and micro grids in the distribution network, the technology of active distribution network (Active Distribution Network, ADN) has also emerged as the times require. Due to the intermittent and random nature of renewable energy such as wind energy and solar energy, not only the power generation has uncertainty and volatility, but also the renewable energy connected to the grid through power electronic control devices will generate a large number of harmonics; The increase of DG in the power grid will lead to further deterioration of the power quality of the distribution network. In this case, the implementation of "rewar...

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Application Information

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IPC IPC(8): G01R31/08
Inventor 李国栋王继东刘亚丽李洪安葛磊蛟吕金炳胡晓辉
Owner STATE GRID CORP OF CHINA
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