Key transmission section identification-based cascading failure analysis method for alternating current/direct current power network

A transmission section and cascading failure technology, which is applied in the direction of instruments, data processing applications, information technology support systems, etc., can solve problems such as large influence range, inability to directly use transmission section search and cascading failure identification

Inactive Publication Date: 2016-02-24
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above methods mainly study the transmission section and cascading failure mode related to the AC line. Since the power flow transfer of the AC line is local, it is mostly limited to several nearby lines. After the DC block, it involves th

Method used

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  • Key transmission section identification-based cascading failure analysis method for alternating current/direct current power network
  • Key transmission section identification-based cascading failure analysis method for alternating current/direct current power network
  • Key transmission section identification-based cascading failure analysis method for alternating current/direct current power network

Examples

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Embodiment 1

[0043] In this example, the feasibility and effectiveness of the proposed method are verified by taking the ±800 kV UHV Chusui DC of China Southern Power Grid as an example.

[0044] The rated power of Chusui DC is 5000MW. The sending-end converter station is located in Chuxiong, Yunnan, and the receiving-end converter station is located in Zengcheng, Guangzhou. In the calculation example, Yunnan 500kV power grid is taken as an example, and the proposed method is used to analyze the key transmission sections and key branches that are prone to cascading failures in Yunnan power grid after the Chusui DC unipolar blockade.

[0045] 1. Topology simplification of Yunnan 500kV power grid

[0046] According to the proposed power grid simplification method, the topology of Yunnan 500kV power grid is simplified, and the simplified Yunnan 500kV topology network is as follows: image 3 shown. Among them, the double-circuit line is treated as a single line during topology search. branc...

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Abstract

The invention provides a key transmission section identification-based cascading failure analysis method for an alternating current/direct current power network. The method comprises the following steps: (A) searching all transmission sections between a direct current transmitting end and a direct current receiving end by a graph theory-based transmission section traversal algorithm, forming a node set S0={vS} from a node vS of the direct current transmitting end, searching all cut sets of branches between S0 and the adjacent point thereof, and finishing traversal searching in a manner of expanding the node set S0 outwards step by step; (B) further identifying key transmission sections which can cause a relatively large cascading failure risk by indexes of a power flow transfer coefficient and section maximum overload rate; and (C) giving cascading failure sets with relatively large risks and key branches which should be mainly monitored in the key transmission sections through transient stability calculation. By the method provided by the invention, the key transmission sections and the key braches, which are prone to cascading failures after a direct current monopole is locked can be effectively determined.

Description

technical field [0001] The invention relates to a method for analyzing cascading faults of AC and DC power grids based on identification of key transmission sections. Background technique [0002] In recent years, there have been many blackouts at home and abroad, which have caused great impact and serious losses. Studies have shown that most of the blackouts are caused by cascading failures, among which the cascading failures caused by successive overloads of transmission lines caused by power flow shifting are one of the important reasons. The cascading overload tripping faults of transmission lines mostly occur on the transmission section. If the relevant transmission section can be identified and monitored first, it is of great significance to block the chain tripping of the line and prevent blackouts. [0003] For example, the China Southern Power Grid is the largest power grid in my country for west-to-east power transmission. It has the characteristics of long-distan...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
CPCY04S10/50
Inventor 刘蔚柳勇军陈刚陈雁
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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