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AC/DC hybrid power system security correction method based on second-order cone

An AC-DC hybrid, power system technology, used in flexible AC transmission systems, AC network circuits, AC networks with the same frequency from different sources, etc.

Active Publication Date: 2018-10-12
WUHAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the current AC / DC hybrid power system lacks a fast and accurate safety correction strategy, the present invention provides a second-order cone-based AC / DC hybrid power system safety correction strategy, which can realize the rapid correction of the safety correction problem. exact solution

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  • AC/DC hybrid power system security correction method based on second-order cone
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  • AC/DC hybrid power system security correction method based on second-order cone

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Embodiment Construction

[0054] The technical solution of the present invention will be further specifically described below through examples and in conjunction with data analysis.

[0055] An embodiment of a security correction strategy for an AC / DC hybrid power system based on a second-order cone:

[0056] The method proposed in this patent has been verified under multiple calculation example models. Due to space limitations, this embodiment takes the improved IEEE30 calculation example as an example, based on MATLAB software and CVX optimization toolkit, to test the feasibility and effectiveness of the method proposed in this paper. Analyze and verify effectiveness. Details are as follows:

[0057] Based on the IEEE30 node standard calculation example, make appropriate improvements:

[0058] 1) Assume that each load node is connected to 4 loads, and the total active and reactive power of each load node k is distributed to its 4 independent loads according to the ratio of 1:2:3:4 (D k-1 、D k-2 、...

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Abstract

The invention belongs to the field of power system security correction, in particular to an AC / DC hybrid power system security correction method based on a second-order cone. The strategy comprises the following steps: 1) proposing a power flow model in the form of the second-order cone including TCSC (Thyristor Controlled Series Compensation) and MTDC (Multi-terminal HVDC) power grids, and establishing a corresponding optimized mathematical model based on the power flow model to greatly increase the optimal calculation speed; 2) screening generators and loads with the best regulation effectsbased on heuristic search to serve as optimization variables, and reducing the number of the optimization variables to further increase the optimization speed; and 3) using DC power and TCSC element parameters as the optimization variables to reduce load shedding. The method has the beneficial effects that 1) the time to develop a security correction scheme is shortened greatly, and online calculation of the security correction scheme becomes possible; 2) power flow off-limit can be eliminated through control measures being as little as possible; and 3) the load shedding is reduced to a certain extent, and the reliability of power supply is enhanced.

Description

technical field [0001] The invention belongs to the technical field of safety calibration strategies for AC / DC hybrid power systems, in particular to a second-order cone-based AC / DC hybrid power system security calibration method. Background technique [0002] In the AC-DC hybrid power system, with the rapid development of the Voltage Source Converter-Based Multi-terminal HVDC (VSC-MTDC) and the Flexible AC Transmission System (FACTS), the power grid’s high-power, long-distance transmission capacity However, the risk of cascading failures caused by DC blocking or line faults leading to system power transfer and cascading failures also increases. The function of the safety correction strategy is to take effective measures to eliminate various over-limit phenomena in the power grid as soon as possible in the early stage of the fault, and minimize the scope of influence and loss of the over-limit. [0003] Studies have shown that VSC-MTDC can control active and reactive power ...

Claims

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Application Information

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IPC IPC(8): H02J3/06H02J3/48H02J3/50H02J3/24H02J1/14
CPCH02J1/14H02J3/06H02J3/24H02J3/48H02J3/50H02J2203/20Y02E40/10
Inventor 林涛毕如玉陈汝斯郭紫昱叶婧徐遐龄
Owner WUHAN UNIV