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Method for determining value range of third harmonic current of distributed power flow controller

A technology of power flow controller and value range, which is applied to AC network circuits, circuit devices, and AC networks with the same frequency from different sources, etc., which can solve damage, reduce the output efficiency of single-phase converters on the parallel side, and speed up transformers. Insulation aging and other issues

Active Publication Date: 2018-12-07
WUHAN UNIV OF TECH
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Problems solved by technology

The 3rd harmonic current is generated by the single-phase converter on the parallel side of DPFC, which will generate 3rd harmonic voltage drop and 3rd harmonic loss on the transformer and line
The extra loss will not only increase the heating of the line to limit the transmission capacity of the line, but also reduce the output efficiency of the single-phase converter on the parallel side; the 3rd harmonic voltage drop on the line is added to the neutral point of the transformer, when it is higher than the transformer When the neutral point insulation voltage level is high, it will accelerate the aging of the transformer insulation and cause direct damage to it

Method used

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  • Method for determining value range of third harmonic current of distributed power flow controller
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  • Method for determining value range of third harmonic current of distributed power flow controller

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Embodiment Construction

[0077] One, at first introduce the method principle of the present invention.

[0078] figure 1 It is the equivalent diagram of the DPFC device when there is only one series-side converter.

[0079] Among them, the access point bus voltage is The bus voltage at the end of the line is R L +jX L is the line impedance on the series side, P L , Q L is the active and reactive power at the outlet of DPFC. The working principle of DPFC is that the three-phase converter VSC-SH1 on the parallel side passes through the three-phase transformer T 1 Injecting reactive power into the busbar -Q sh To increase the access bus voltage the magnitude of . At the same time absorb active power P from the bus sh As a single-phase converter VSC-SH2 on the parallel side, the 3rd harmonic current is emitted The active source, VSC-SH2 via Δ-Y transformer T 2 3rd harmonic current from neutral point After flowing through the series side converter and the line, it finally passes through ...

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Abstract

The invention belongs to the technical field of smart grid operation and stability control, and specifically relates to a method for determining the value range of the third harmonic current of a distributed power flow controller to ensure the safe, stable and economical operation of a system including the distributed power flow controller. The third harmonic current is an important parameter forrealizing the functions of the distributed power flow controller. The invention provides mathematical relationships between the third harmonic current and the transmission line transmission capacity,between the third harmonic current and the insulation voltage of a parallel-side transformer neutral point, and between the third harmonic output efficiency of a parallel-side single-phase converter and the insulation voltage of the parallel-side transformer neutral point, and concludes the method for acquiring the value range of the economical and safe third harmonic current, and provides theoretical basis and reference for device parameter design.

Description

technical field [0001] The invention belongs to the technical field of smart grid operation and stability control. It specifically relates to a method for determining the value range of the third harmonic current of a distributed power flow controller, so as to ensure the safe, stable and economical operation of a system including a distributed power flow controller. Background technique [0002] Distributed Power Flow Controller (DPFC) has the advantages of low voltage level, low power, high redundancy, small investment and more powerful functions. It is realized by energy exchange on the parallel side. The 3rd harmonic current is generated by the single-phase converter on the parallel side of DPFC, which will generate 3rd harmonic voltage drop and 3rd harmonic loss on the transformer and line. The extra loss will not only increase the heating of the line to limit the transmission capacity of the line, but also reduce the output efficiency of the single-phase converter on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 唐爱红卢智键曾涤非徐秋实郑旭洪梅子易柏年黄涌张述元
Owner WUHAN UNIV OF TECH
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