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Power system fast transient stability simulation method based on real-time dynamic equivalence

A transient stability, power system technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problem that the calculation speed cannot meet the online calculation requirements of the power system, and the calculation amount is large.

Inactive Publication Date: 2016-03-02
ZHEJIANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art, and propose a fast transient stability simulation method for power systems based on real-time dynamic equivalents, which can overcome the computational complexity of existing numerical integration methods in the analysis and calculation of transient stability of power systems Large, the calculation speed can not meet the shortcomings of the online calculation requirements of the power system

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  • Power system fast transient stability simulation method based on real-time dynamic equivalence
  • Power system fast transient stability simulation method based on real-time dynamic equivalence
  • Power system fast transient stability simulation method based on real-time dynamic equivalence

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with specific calculation examples.

[0053] A kind of fast transient stability simulation method based on real-time dynamic equivalent that the present invention proposes, comprises the following steps

[0054] Step 1: Carry out transient stability numerical integral calculation on the original system, and only simulate up to the equivalent time T Z ;

[0055] Step 2: If no unbounded angle gap is found, it is confirmed that it is a stable situation. If an unbounded angle gap is found, the following steps are performed;

[0056] Step 3: Group the systems according to the generator power angle curves before the equivalent moment.

[0057] Step 4: According to the grouping results in step 3, perform model aggregation on the generators of each group to obtain the equivalent generators of the group, and apply the fast identification method of the node admittance matrix of the equivalent system to obtain ...

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Abstract

The invention discloses a power system fast transient stability simulation method based on real-time dynamic equivalence. According to the method, real-time grouping and model aggregation are performed on power generator sets by a short period of whole system numerical integration calculation after a fault occurs, then equivalent system network parameters are obtained by applying a proposed equivalent system nodal admittance matrix rapid identification method, and finally transient stability calculation is completed on an obtained dynamic equivalent system. Compared with existing power system transient stability analysis methods which have disadvantages that calculation amount is high and calculation speed cannot meet the online calculation requirement, the method has advantages of high precision and great convergence of a conventional numerical integration method due to low number of grouping and low time consumption of identification of an equivalent system admittance matrix, and a calculation system is greatly simplified and calculation amount is reduced.

Description

technical field [0001] The invention belongs to power system automation, and in particular relates to a power system transient stability simulation method suitable for on-line calculation. Background technique [0002] The continuous expansion of the power grid and the emergence of the power market make the operating environment of the power system more complex, and the requirements for the safe and stable operation of the power grid are also getting higher and higher. Although there have been quite a lot of research results in the field of stability control systems in our country, there are still many deficiencies. The "offline calculation, real-time matching" method in the stability control has a large amount of calculation, and has poor adaptability to changes in the operation mode and network structure, and is prone to mismatch situations; "online pre-decision making, real-time matching" may cause measurement errors and transmission losses. Causes the mismatch between t...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 王建全高一凡肖谭南
Owner ZHEJIANG UNIV
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