Distribution factor-based rapid load flow calculation algorithm applied to cascading failure
A technology of cascading failure and distribution factor, applied in computing, special data processing applications, instruments, etc., can solve the problems of slow calculation speed and low accuracy of DC power flow method, and achieves reduction of calculation amount, strong engineering practicability and adaptability, The effect of improving the ability of online safety analysis and early warning of cascading failures
Active Publication Date: 2015-07-08
NARI TECH CO LTD +1
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[0007] The purpose of the present invention is to overcome the disadvantages of slow calculation speed of the AC power flow method and low precision of the DC power flow method, and provide a power flow evaluation and analysis method in successive faults that can take into account both calculation accuracy and calculation speed
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[0029] The present invention will be described in further detail below with reference to the accompanying drawings and examples.
[0030] Figure 5 A specific flow chart of the method of the present invention is given. Such as Figure 5 As shown, step 1 of this method is to read in the initial system working conditions and calculate the original AC power flow in the sequential fault analysis. If the original AC power flow calculation results do not converge, reselect the initial system working conditions until the original AC power flow calculation results converge. If the calculation result of the original AC power flow converges, the initial line reactance matrix X is read in m , the initial node reactance matrix X and the successive fault chain information, the successive fault chain is composed of j-level (j>=1) line breaking, and each level of line breaking can only break one line, or it can be multiple lines at the same time break. X here m is an m×m dimensional mat...
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The invention discloses a distribution factor-based rapid load flow calculation algorithm applied to cascading failure and belongs to the technical field of power systems and automation. The method mainly comprises two tasks of judging whether the rapid load flow calculation algorithm can be adopted and rapidly calculating the line load flow after the cascading failure, wherein the former step is realized by judging a quantitative index according to an error of the second-order sensitivity design, and in the latter step, rapid estimation is performed through a distribution factor method. According to the method, by adoption of the distribution factor load flow estimation mode, the conventional load flow calculation times in the cascading failure analysis can be greatly reduced, so that the calculation efficiency is greatly improved; and meanwhile, the condition of great estimation error is indicated by utilizing the error judgment quantitative index, and the alternating current load flow calculation is restarted to guarantee the calculation precision. According to the method, the calculation amount is reduced to the greatest degree under the condition that the calculation precision is guaranteed, the practical engineering requirements are met, and the method has high universality.
Description
technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof, and more precisely relates to a power flow calculation method applied to successive faults. Background technique [0002] In recent years, frequent blackouts have had a great impact on society and economy. For example, the 8.14 blackout in North America disrupted the lives of 50 million people, and the economic loss was as high as 30 billion US dollars. A large number of examples and studies have shown that successive failures are the main cause of blackouts. The causes of successive faults are numerous and intertwined, and the mechanism is extremely complex; at the same time, there are many components in the actual power system, and there are great diversity and uncertainty in the faults; in addition, the smart grid puts forward new requirements for the operation risk management of the power system. In order to prevent blackout accidents caused by successiv...
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IPC IPC(8): G06F19/00
Inventor 薛禹胜戴元煜董朝阳薛峰
Owner NARI TECH CO LTD