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A Method and System for Optimal Selection of Decoupling Sections Considering DC Modulation Capability

A technology for optimizing selection and cross-section, which is applied in the direction of AC network circuits, power transmission AC networks, circuit devices, etc., can solve the problems that traditional methods do not necessarily separate sections, local power grid transient instability, etc., and achieve the reduction of transient instability risk, and the effect of improving the ability to resist serious failures

Active Publication Date: 2022-04-15
NANJING NARI GROUP CORP +2
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Problems solved by technology

[0006] The present invention provides a method and system for optimizing the selection of decoupling sections, which solves the problem that the traditional method does not necessarily obtain the optimal decoupling section, and there is a problem of transient instability of the local power grid after decoupling

Method used

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  • A Method and System for Optimal Selection of Decoupling Sections Considering DC Modulation Capability
  • A Method and System for Optimal Selection of Decoupling Sections Considering DC Modulation Capability
  • A Method and System for Optimal Selection of Decoupling Sections Considering DC Modulation Capability

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0043] Such as figure 1 As shown, a method for optimal selection of decomposed sections includes the following steps:

[0044] Step 1. When the AC / DC hybrid system is out of step due to a large disturbance, according to the generator rotor power angle swing curve after the disturbance, the generator is divided into two complementary coherent groups according to the theory of extended equal area criterion, which are respectively The leading group S and the remaining group A, wherein the group ahead of the UPG (unbounded position gap in the disturbed trajectory) is defined as the leading group S, and the other group is called the remaining group A.

[0045] Use the phasor measurement unit PMU to...

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Abstract

The invention discloses a method for optimizing the selection of decoupling sections, which includes dividing the generator into two complementary coherent groups when the AC-DC hybrid system is out of step due to a large disturbance; determining the boundary nodes according to the coherent grouping information, and Classify the location of the DC converter station in the AC / DC hybrid system; according to the classification results, select different search principles to search for the optimal disassembly section. At the same time, the optimized selection system for decomposing sections is also disclosed, including a grouping module, a classification module and a module for searching the optimal decoupling section. The present invention classifies the drop points of DC converter stations, and selects different search principles according to the classification results, thereby accurately searching for the optimal unloading section, effectively reducing the risk of transient instability of the local power grid after unloading, and is conducive to improving the power grid. The ability to withstand severe failures.

Description

technical field [0001] The invention relates to a method and a system for optimizing and selecting a disassembly section, in particular to a method and a system for optimizing and selecting a disassembly section taking DC modulation capability into consideration, and belongs to the technical field of power systems and automation thereof. Background technique [0002] With the vigorous advancement of UHV AC and DC projects, the role of regional interconnected power grids in optimizing the allocation and utilization of energy on a large scale has been continuously enhanced, but it also brings new challenges to safe and stable operation. As an emergency control method, decoupling is the last line of defense for the safe and stable operation of the power system. While isolating the asynchronous cluster and blocking fault propagation, it is necessary to ensure that each independent subsystem can maintain safe and stable operation after decoupling. [0003] Determining a reasonabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/48
CPCH02J3/36H02J3/48H02J2203/20Y02E60/60
Inventor 吴雪莲刘福锁李兆伟黄慧李威薛峰王玉朱玲张红丽谭真胡阳郄朝辉张倩赵彦丽
Owner NANJING NARI GROUP CORP
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