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Distributed power supply high frequency impedance equivalence modeling method

A distributed power supply and high-frequency impedance technology, applied in the field of value modeling, can solve the problems of difficult accurate calculation of fault current, difficulty of distributed power supply impedance model, and inability to accurately determine power supply impedance, so as to achieve more certainty and universal adaptive effect

Active Publication Date: 2017-12-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

These factors make the fault current situation more complicated after the distributed generation is connected to the power system
[0006] Therefore, since the fault current characteristics of distributed power sources are closely related to factors such as control strategies and output power, it is difficult to accurately calculate the fault current after a fault. The corresponding source impedance cannot be determined exactly after a fault

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  • Distributed power supply high frequency impedance equivalence modeling method
  • Distributed power supply high frequency impedance equivalence modeling method
  • Distributed power supply high frequency impedance equivalence modeling method

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Embodiment Construction

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0045] After a fault occurs in the power system, the voltage and current transients contain information in the full frequency domain. Among them, the energy density in the frequency band within a few thousand Hz is high, and the signal-to-noise ratio is strong, which can be effectively distinguished from noise. When only the high-frequency component network is considered after the fault, the high-frequency equivalent network of the system is observe...

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Abstract

The invention discloses a distributed power supply high frequency impedance equivalence modeling method comprising the following steps: obtaining time domain data in a preset time window before and after the fault when the electric power system fails; calculating a high frequency impedance in a preset high frequency band scope according to the time domain data, wherein the preset time window duration is smaller than an electric power system distributed power supply control strategy response time duration. The method uses the short window data to calculate the high frequency impedance, thus effectively preventing influences caused by distributed power supply control strategy changes and output power changes; compared with a distributed power supply model under the fundamental frequency, the high frequency impedance model has more determinacy and universality, thus accurately calculating the corresponding high frequency impedance when the electric power system fails.

Description

technical field [0001] The invention relates to the technical field of fault detection of power systems, in particular to a method for modeling high-frequency impedance equivalents of distributed power sources. Background technique [0002] In the power system, the common distributed generation (DG) can be mainly divided into two categories according to the grid connection method: [0003] (1) Direct grid-connected DG, such as double-fed induction fan (DFIG), etc.; [0004] (2) Grid-connected DGs via inverters, such as photovoltaics (PV), permanent magnet direct-drive wind turbines (PMSG), fuel cells, etc. [0005] The short-circuit current characteristics provided by the distributed power generation itself are related to the control strategy. In actual operation, because some control parameters cannot be determined in advance, the short-circuit current has a certain degree of unpredictability and uncertainty. And the relative size relationship between the short-circuit cu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/38H02J2203/20
Inventor 贾科任哲锋李论李晨曦宣振文戴明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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