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Self-adaptive dynamic equivalence method for transient rotor angle stability online analysis of power system

A technology of transient power angle stability and dynamic equivalent, which is applied in the direction of adaptive control, general control system, control/regulation system, etc., to achieve the effect of improving the calculation speed

Active Publication Date: 2012-11-28
NARI TECH CO LTD
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Problems solved by technology

Therefore, it is difficult to perform power grid dynamic equivalents in advance on the basis of offline calculations to meet the accuracy requirements of online security and stability calculations

Method used

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  • Self-adaptive dynamic equivalence method for transient rotor angle stability online analysis of power system
  • Self-adaptive dynamic equivalence method for transient rotor angle stability online analysis of power system
  • Self-adaptive dynamic equivalence method for transient rotor angle stability online analysis of power system

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Embodiment Construction

[0017] Attached below figure 1 , the method of the present invention is described in detail.

[0018] figure 1 Step 1 in the above describes the criterion of whether to carry out dynamic equivalence in the online analysis of the transient power angle stability of this fault. The criterion is that if the online analysis of the transient power angle stability of the fault is the first time, Or the transient power angle stability margin of the power grid after the fault in the last round of power grid operation is greater than the set value, or the current running state of the generator in the critical cluster has no change in switching on / off compared to the previous round, or the set The current operating state of the components of the key section has no change in switching on / off compared to the previous round, and the dynamic equivalent value of the power grid for the fault is performed; otherwise, the dynamic equivalent value of the power grid is not performed, and the tran...

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Abstract

The invention discloses a self-adaptive dynamic equivalence method for transient rotor angle stability online analysis of a power system. The invention belongs to the power system and automation technique fields. The method comprises the following steps of: calculating a detail degree index of dynamic equivalence carried out on the power system according to a transient rotor angle stability mode of the power grid after a certain expected failure under the power grid operation condition of the previous round, and the change of the current power grid operation condition relative to the power grid operation state of the previous round; carrying out the coherent equivalence on the generator of the rest generator group, the participation factor of which is less than the dynamic equivalence index, in the transient rotor angle stability mode of the failure; remaining nodes from which the electrical distances to other generators and the failure element are less than a set value and the branches directly connected with other branches; carrying out the corresponding network simplification on the power grid; and carrying out the transient rotor angle stability online analysis of the failure of the current round according to the equivalent power grid. Therefore, the calculation speed is improved by the invention.

Description

technical field [0001] The invention belongs to the technical field of electric power system and automation. Background technique [0002] Online analysis of power system security and stability has become an important function of power grid dispatching automation system. With the gradual expansion of power grid scale, the calculation amount of transient stability online analysis is very large, which has become the main factor restricting the speed of online analysis of security and stability. Therefore, the dynamic equivalent method of power system is still of great significance even when the computer performance has been greatly improved, especially in the online calculation of safety and stability analysis and control decision. [0003] On-line safety and stability analysis is to calculate the safety and stability of multiple expected faults based on the actual operation status of the power grid. On the one hand, with the rapid development of new energy The safety and sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G05B13/02
Inventor 徐泰山彭伟方勇杰薛禹胜罗剑波姚海成任先成彭慧敏侯玉强
Owner NARI TECH CO LTD
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