Power transfer solving method under grid failure state

A power transfer and power grid fault technology, applied in the field of power systems, can solve problems such as the inability to apply real-time power transfer solutions

Inactive Publication Date: 2010-04-21
CHONGQING UNIV
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Problems solved by technology

For example, the power flow calculation method and other power flow calculation programs given in the domestic literature "Research and Application of Type-Extended Power Flow Calculation" ("Power Grid Technology", Volume 27, No. 11, Page 25, 2003), no matter which method is used, they a

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  • Power transfer solving method under grid failure state
  • Power transfer solving method under grid failure state
  • Power transfer solving method under grid failure state

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] The method for solving the power transfer under the grid fault state provided by the present invention is implemented as follows:

[0022] In the first step, when the power grid is in normal operation, the WAMS collects and records the network power flow, the voltage of each node, the current of the branch and the transmission power of each line;

[0023] The second step, refer to the attached image 3 , if a single-phase-to-ground short-circuit fault occurs in the transmission line ij, the protection action removes the faulty phase, and uses WAMS to record the network power flow, node voltage and branch current at this time;

[0024] The third step, for the positive sequence network of the single-phase fault, refer to the appendix figure 2 , according to the superposition principle, it can be decomposed into two parts: the normal situation and the additional...

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Abstract

The invention relates to a power transfer solving method under a grid failure state, aiming at a grid provided with a wide area measurement system (WAMS). An overlay principle is utilized, and the network state in normal operation is overlaid with the state of a single-power failure additional network only under the action of failure power supply so as to obtain network power distribution after a failure circuit is removed and further solve for a power transfer amount on a non-failure circuit. A great deal of simulation test results show that the method can accurately solve for the power transfer amount under the grid failure state and solve the key technical problems that non-convergence easily occurs and solving can not achieved in the traditional tide solving. The power transfer solving method under the grid failure state can effectively solve the power amount transferred to the non-failure circuit after failure occurs to a transmission line, and is still effective even under the condition that network tide can not be converged after the failure.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a power transfer solution method in a grid fault state. Background technique [0002] The structure and operation of modern power systems are increasingly complex and volatile, increasing the chances of systemic failures and widespread blackouts. When a transmission line fails and goes out of operation, since the system power output will not change in a short period of time, the power originally carried on the faulty line must be transferred to other lines in the network. If the power diverted to a normal line is such that the actual power on that line exceeds its rated transmission capacity, it may cause that line to also be taken out of service, potentially causing a more severe cascading failure. [0003] In this case, if the power transferred to other lines after the line is cut off can be known before the faulty line is out of service, corresponding measure...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 卢继平张浩汪洋孔令云乔梁
Owner CHONGQING UNIV
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