Multi-infeed power transmission system fault partition current limiter installation method based on graph theory

A technology of fault current limiter and power transmission system, applied in the direction of electrical components, etc., can solve the problems of uncertainty of the installation position of fault current limiter, difficulty in implementation, and inability to generalize into one piece.

Inactive Publication Date: 2015-12-30
STATE GRID OF CHINA TECH COLLEGE +1
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Problems solved by technology

This method can theoretically achieve partitioning of the AC grid, but it is quite difficult to implement
First of all, system emergencies can be of various types, which cannot be generalized into one, and for large-scale AC systems, the amount of c

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  • Multi-infeed power transmission system fault partition current limiter installation method based on graph theory
  • Multi-infeed power transmission system fault partition current limiter installation method based on graph theory
  • Multi-infeed power transmission system fault partition current limiter installation method based on graph theory

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] 1 Fault Partition Technology Theory

[0038] 1.1 Application Introduction of Fault Current Limiter (FCL)

[0039] With the gradual expansion of the scale of the power system, the complexity of the system and the difficulty of control continue to increase, and the power of the AC grid is also increasing. This situation leads to an increasing level of AC short-circuit current. When a short-circuit fault occurs in the system, the traditional method is to operate the circuit breaker to isolate the fault, which may lead to serious consequences such as loss of power supply to the load, disconnection of the power grid, and even system instability. The fault current limiter can limit the short-circuit current without changing the grid structure and system operation mode, and at the same time avoid the instability of the AC system caused by the change of...

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Abstract

The invention discloses a multi-infeed power transmission system fault partition current limiter installation method based on a graph theory. The method comprises the steps that an alternating-current network with a direct-current drop point is extracted to be a graph, all generatrices form a vertex set of the graph, and all alternating-current lines form a frontier set of the graph. Two weights w1 and w2 are given to each edge of the graph and correspond to a relative value of a tide mode and a serial number of the edge; sorting is performed according to the size of all the weights w1, and fault current limiters are installed on the edges with the w1 larger than 1 for grouping. A direct-current system inversion side extinction angle is used as the judgment standard, and step-by-step optimization is performed through a continuous simulation method to obtain the minimum current limiter combination meeting the requirement. According to the method, power grid partitioning and fault isolation can be effectively achieved after a fault occurs, it is ensured that no simultaneous commutation failure occurs on a multi-infeed power transmission system, and the effectiveness of the method is verified.

Description

technical field [0001] The invention relates to a graph theory-based method for installing a current limiter for fault zones in a multi-infeed power transmission system. Background technique [0002] With the rapid development of my country's DC transmission technology and the implementation of energy strategies such as "south-to-north power transmission" and "west-to-east power transmission", East China Power Grid and Southern Power Grid have formed a multi-infeed AC-DC system. According to the national grid planning, more DC systems will fall into the AC grid in the future. Compared with pure AC system and single-infeed DC system, the interaction characteristics between multi-infeed DC transmission systems have a great influence on the safe and stable operation of the entire system. [0003] Commutation failure is one of the most common faults in DC systems. In the multi-infeed DC transmission system, the inverter stations are coupled to each other through the AC system ...

Claims

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Application Information

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IPC IPC(8): H02J5/00
Inventor 姜一涛李宏伟姜杨牟黎甘言礼刘海客贾涛张正茂
Owner STATE GRID OF CHINA TECH COLLEGE
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