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A Safety Calibration Method for AC-DC Hybrid Power System Based on Second-Order Cone

A technology of AC-DC hybrid and power system, which is applied in the direction of flexible AC transmission system, AC network circuit, AC network with the same frequency from different sources, etc., to achieve the effect of optimizing the calculation speed

Active Publication Date: 2021-09-24
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A Safety Calibration Method for AC-DC Hybrid Power System Based on Second-Order Cone
  • A Safety Calibration Method for AC-DC Hybrid Power System Based on Second-Order Cone
  • A Safety Calibration Method for AC-DC Hybrid Power System 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 safety correction, in particular to a second-order cone-based AC / DC hybrid power system safety correction method. The strategy includes: 1) Proposing a power flow model in the form of a second-order cone including TCSC and MTDC power grids, and establishing a corresponding optimization mathematical model based on the power flow model to greatly increase the optimization calculation speed; 2) Screening control effects based on heuristic search The best generator and load are used as optimization variables, the number of optimization variables is reduced, and the optimization speed is further improved; 3) DC power and TCSC component parameters are also used as optimization variables to reduce load shedding. The beneficial effects of the present invention are as follows: 1) greatly shorten the time for formulating a safety correction scheme, and provide possibility for online calculation of the safety correction scheme; 2) eliminate power flow violation by using as few control means as possible; 3) in a certain Reduce load shedding to a certain extent and improve power supply reliability.

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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Patent Type & Authority Patents(China)
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