Optimal installation point selection method for active filter in power distribution network

A source filter and installation point technology, applied in the field of distribution network, can solve the problem that the installation point selection method cannot determine the optimal installation point, etc., achieve universal applicability and improve the effect of compensation

Active Publication Date: 2019-12-20
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the technical problem that the existing installation point selection method cannot determine the optimal installation point, and ov

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  • Optimal installation point selection method for active filter in power distribution network
  • Optimal installation point selection method for active filter in power distribution network
  • Optimal installation point selection method for active filter in power distribution network

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Embodiment 1

[0047] Such as Figure 6 As shown, the present invention discloses a method for selecting an optimal installation point of an active filter in a distribution network, comprising the following steps:

[0048] Preliminary selection of multiple basic busbars as an alternative installation point based on experience;

[0049] Install APF with separate compensation for harmonic active and reactive power on multiple alternative installation points, and use the control variable method to control the compensation of APF for each harmonic current, so that the harmonic current distortion rate of the total bus can reach the same value , to obtain the compensation curve corresponding to each basic bus, and calculate the injection compensation current value on each alternative installation point corresponding to the harmonic current distortion rate of the total bus when the harmonic current distortion rate reaches the same value according to the compensation curve;

[0050] Select the alte...

Embodiment 2

[0053] Embodiment 2 is a preferred embodiment of Embodiment 1. The difference between it and Embodiment 2 is that the harmonic control objective function of the distribution network is constructed, and the harmonic current in the total bus is respectively calculated according to the compensation curve When the distortion rate reaches the same value, the injection compensation current value corresponding to each alternative installation point; in this embodiment, the same input value is the harmonic current distortion rate of the total bus, and the compensation curve is the compensation control model according to The compensation curve respectively calculates the injection compensation current value on each alternative installation point when the harmonic current distortion rate of the total bus reaches the same value. In this embodiment, the compensation current of the filter is controlled so that The distortion rate of the total busbar is consistent, so that the harmonic curre...

Embodiment 3

[0113] In order to test the correctness of the method proposed in this paper, according to the distribution network wiring diagram of a certain factory, it is simplified to obtain a 10-bus distribution network, the grid supplies 10KV, and the rest of the branches are connected to 10KV / 0.4KV transformers, followed by various Rectifiers and equipment. Connect the circuit such as figure 2 shown.

[0114] The power supply is composed of an ideal power supply, and each busbar is connected with a nonlinear load. The most important harmonics are the 5th, 7th, 11th, 13th, 17th and 19th harmonics. By establishing a voltage transfer matrix and a current transfer matrix, analyzing their frequency responses, the branches 1, 6, and 8 that are easy to resonate are obtained, and then the APF mentioned in this article is connected to the busbars other than these branches. By adjusting the different compensation operating states for each harmonic, the output current harmonic distortion rate...

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Abstract

According to the optimal installation point selection method for the active filter in the power distribution network, a plurality of basic buses are primarily selected as alternative installation points according to experience; APFs capable of separately compensating active power and reactive power of harmonic waves are mounted on the plurality of alternative mounting points; the method of controlling variables is adopted to control the APF to compensate a harmonic current each time to enable the harmonic current distortion rate of the total bus to reach the same value and obtain a compensation curve corresponding to each basic bus, and an injection compensation current value on each corresponding alternative mounting point is calculated when the harmonic current distortion rate of the total bus reaches the same value according to the compensation curve; and the alternative installation point with the minimum injection compensation current value is selected as an optimal installation point. According to the invention, the optimal installation point is selected by adopting the method, the harmonic current distortion rate of the total bus meets the grid-connected requirement, and thecompensation effect of the active filter on the power distribution network can be improved. The method has universal applicability and is suitable for networks with various nonlinear loads.

Description

technical field [0001] The invention belongs to the technical field of distribution network, and in particular relates to a method for selecting an optimal installation point of an active filter in a distribution network. Background technique [0002] With the extensive application of power electronic devices in electrical equipment, the degree of harmonic pollution of the power grid has been aggravated. Harmonics not only affect the normal operation of electrical equipment, but also bring hidden dangers to the safety and economic operation of the power grid. At this stage, the main methods of harmonic control are divided into active filter, passive filter and hybrid filter. The hybrid filter is composed of active filter and passive filter. Because it has both advantages and high cost performance, it is the main form in the current distribution network. [0003] The main research focus of the current active power filter (APF, Active power filter) is on the nearby compensa...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 裘智峰张亮桂宁王一帆桂卫华
Owner CENT SOUTH UNIV
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