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Direct-current receiving end power grid harmonic distribution and resonance control method based on modal analysis method

A receiving-end power grid, resonance control technology, applied to the AC network to reduce harmonics/ripples, AC network circuits, harmonic reduction devices, etc.

Active Publication Date: 2019-07-26
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology

However, there is a certain degree of instability in the traditional modal sensitivity, that is, in some cases, adjusting the parameter of the most sensitive component is not the most effective measure; while the parameter of the component with less sensitivity may be more effective for resonance control, thus, Traditional modal sensitivity has certain limitations

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  • Direct-current receiving end power grid harmonic distribution and resonance control method based on modal analysis method
  • Direct-current receiving end power grid harmonic distribution and resonance control method based on modal analysis method
  • Direct-current receiving end power grid harmonic distribution and resonance control method based on modal analysis method

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] 1. Traditional modal sensitivity

[0035] Using the modal analysis theory, it is possible to analyze the participation degree of each component parameter in the power grid to the resonance, and propose the most effective measures to alleviate the resonance. The harmonic resonance analysis method based on modal analysis is as follows:

[0036] Under the hth harmonic, the node admittance equation of the constructed network is as follows:

[0037]

[0038] Among them: Y h is the nodal admittance matrix; V h is the node voltage; I h is the current injected into each node; the voltage, current and admittance matrix are discussed under the h-order harmonic. For the convenience of description, the subscript h is omitted in the subsequent description.

[0039] When the resonance occurs, the voltage of the relevant nodes is very...

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Abstract

The invention discloses a direct-current receiving end power grid harmonic distribution and resonance control method based on a modal analysis method; the direct-current receiving end power grid harmonic distribution and resonance control method comprises the following steps that the modal first-order sensitivity and second-order sensitivity of each element parameter in a direct-current receivingend power grid are calculated; and before the change of the element parameter reaches a critical value, the capability of inhibiting the resonance is adjusted by comparing the parameter of each element with the first-order sensitivity, and after the change of the element parameter exceeds the critical value, the parameters of the elements are compared through second-order sensitivity to obtain anelement parameter adjusting mode with the optimal resonance suppression effect, and the resonance of the direct-current receiving end power grid is controlled through the adjusting mode. According tothe method disclosed by the invention, the modal first-order sensitivity and second-order sensitivity are combined, so that the resonance inhibition effect of the parameters of each element can be more accurately compared and adjusted; and the instability of the traditional modal sensitivity is overcome.

Description

technical field [0001] The invention belongs to the field of harmonic resonance of power quality technology, and in particular relates to a harmonic distribution and resonance control method of a DC receiving end power grid based on a modal analysis method. Background technique [0002] With the development of inter-regional power grids, multiple DC receiving-end urban power grids have emerged in China. Multiple DC feed-in urban power grids have the characteristics of large DC feed-in capacity, multiple DC drop points, high cable coverage, and a large number of harmonic sources, which makes harmonic distribution and conduction more complicated. The receiving-end converter station acts as an important harmonic source of high-voltage level for multi-DC feeding into the urban power grid, and injects 11th and 13th harmonics into the power grid. The cable rate of urban power grid is very high. Due to the large distributed capacitance of cables to the ground, inductive-capacitanc...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/01
CPCH02J3/01H02J3/36H02J2003/365Y02E40/40Y02E60/60
Inventor 潘爱强潘玲张鹏冯倩赵劲帅
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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