Multi-direct-current feed-in city power transmission network harmonic wave amplification characteristic analysis method

A multi-DC feeding and characteristic analysis technology, applied in the field of harmonic amplification characteristic analysis of multi-DC feeding urban transmission network, can solve the abnormal power consumption of household appliances, the centralized parameter model is no longer applicable, and the distributed parameter characteristics of long cables cannot be ignored. And other issues

Active Publication Date: 2017-01-18
STATE GRID SHANXI ELECTRIC POWER
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Problems solved by technology

The feed-in of multiple DC transmission systems makes the harmonic source of the urban power grid more complicated; the extensive use of cables causes harmonic amplification in the local power grid; the high density of power supply makes harmonic pollution serious, causing serious damage to the low-voltage distribution network Abnormal power consumption of a large number of household appliances
[0003] At present, the research on the influence of cables on harmonic amplification is mainly focused on urban distribution networks, which usually use low-voltage short cables ranging from several hundred meters to several kilometers, and harmonics only occur at high-order harmonics (such as above 29th) Amplification, considering the isolation effect of the transformer, the amplification effect of the cable on the harmonic is usually limited to the voltage level to each low voltage level
The cables used in the urban transmission network have the characteristics of high voltage level and long length, whic

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  • Multi-direct-current feed-in city power transmission network harmonic wave amplification characteristic analysis method
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  • Multi-direct-current feed-in city power transmission network harmonic wave amplification characteristic analysis method

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Embodiment Construction

[0067] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. For the modal analysis method to analyze the harmonic amplification characteristics of multi-DC fed urban transmission network, the specific implementation steps are as follows:

[0068] 1) Establish the distribution parameter model of the high-voltage long cable: the equivalent circuit of the cable π-type two-port equivalent, such as figure 1 As shown, considering the case of higher harmonics, the cable parameters satisfy r 0 0 , considering the case of higher harmonics. Then the cable characteristic impedance and propagation constant of the hth harmonic are:

[0069] Z C h ≈ x 0 / ...

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Abstract

The invention discloses a multi-direct-current feed-in city power transmission network harmonic wave amplification characteristic analysis method. Through an established high-voltage long-cable distribution parameter model and a direct-current power-transmission droppoint harmonic wave emission frequency scope, a city power transmission network node admittance matrix is acquired. And then a harmonic wave amplification inductance and capacitance coupling relationship is decoupled so as to determine a harmonic wave amplification key modal. Based on the above condition, a node observation factor, a harmonic wave source excitation factor and sensitivity of a modal impedance to a network component parameter are calculated. In the invention, a harmonic wave amplification frequency scope of a multi-infeed city power transmission network can be accurately determined, a node which is greatly influenced by harmonic wave amplification can be accurately determined too, and an effect of each direct-current droppoint harmonic wave disturbance source can be well assessed. An idea of reducing the harmonic wave amplification through reversely adjusting a component parameter according to a component modal sensitivity is provided, which is good for searching a solution scheme of restraining the harmonic wave amplification.

Description

technical field [0001] The invention relates to the technical field of harmonic analysis of multiple DC feed-in grids, in particular to a method for analyzing harmonic amplification characteristics of multiple DC feed-in urban transmission grids. Background technique [0002] In recent years, due to the increasing scale of urban power grids and the rapid development of power electronics technology, urban power grids have shown the characteristics of a large number of harmonic sources, high cable coverage, and high power supply density. The feed-in of multiple DC transmission systems makes the harmonic source of the urban power grid more complicated; the extensive use of cables causes harmonic amplification in the local power grid; the high density of power supply makes harmonic pollution serious, causing serious damage to the low-voltage distribution network Abnormal power consumption of a large number of household appliances. [0003] At present, the research on the influe...

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01H02J2203/20Y02E40/40
Inventor 赵俊屹杨超颖薛志伟
Owner STATE GRID SHANXI ELECTRIC POWER
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