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Computation method capable of tracking Davinan equivalence parameter base on time domain simulation

A Thevenin equivalent and calculation method technology, applied in the field of value parameters, can solve the problems of large errors in the Thevenin equivalent two-node system and cannot meet the requirements of analysis, and achieves the effects of strong adaptability, fast calculation speed and high precision

Active Publication Date: 2009-08-12
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

This method can calculate the Thevenin equivalent two-node system parameters more accurately for the case where the interior of the Thevenin equivalent system at two operating points is unchanged and only the load on the load bus side changes; but for the internal change of the equivalent system , because the solution of the equation assumes that the parameters of the two operating points remain unchanged, which is inconsistent with the actual situation, the obtained parameters of the Thevenin equivalent two-node system have a very large error from the actual value, which cannot meet the requirements of further analysis

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  • Computation method capable of tracking Davinan equivalence parameter base on time domain simulation
  • Computation method capable of tracking Davinan equivalence parameter base on time domain simulation
  • Computation method capable of tracking Davinan equivalence parameter base on time domain simulation

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[0061] The following is an implementation example of the present invention: take a 3-machine 10-node system for simulation calculation as an example. Further explanation is as follows:

[0062] The structure of the above 3-machine 10-node system is as follows: figure 1 As shown, two generators supply power to two loads in the load area through 5 circuits of 500kV busbars, and the total transmission power is 5000MW. Among them, industrial loads are connected to 500kV busbars through a transformer, while residential and commercial loads are connected twice through two transformers. The step-down is connected to the 500kV busbar. The load area adopts a large number of parallel compensation devices and includes a 1600MVA generator.

[0063] The method for obtaining the Thevenin equivalent parameters of the system at any load bus in the transient process specifically includes the following steps:

[0064] 1) At time t, when the disturbance starts, use the system network algebra...

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Abstract

The invention provides a method for tracking and solving a Thevenin equivalent parameter in a transient process of a power system. The method solves the system Thevenin equivalent parameter on an arbitrary load bus by a compensation method by using a network algebraic equation generated in each calculation step of a transient stability operation program. The method has good operability and applicability without any assumption premise, and has high precision of the Thevenin equivalent parameter which is obtained by calculation. The result of the method can be applied to any analysis and calculation of the power system which is required to form a Thevenin equivalent system.

Description

technical field [0001] The invention relates to a method for obtaining system Thevenin equivalent parameters at any load bus in a transient process, and belongs to the field of power systems. Background technique [0002] In an actual power system, for any time section k at time k, the system can be viewed from a certain load bus to the system, and the system can be regarded as a two-node system in which a voltage source supplies power to the studied load bus through an impedance (that is, Thevenin equivalent ), as attached Figure 5 shown. Figure 5 middle, and Z k are the potential and impedance of the external equivalent system at time k, respectively, and the load bus voltage at this time is Current is The apparent power of the load is S . k = P k + jQ k . As the operating state of the system ch...

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Application Information

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IPC IPC(8): H02J3/00G06F17/13
Inventor 汤涌孙华东易俊侯俊贤邵瑶
Owner CHINA ELECTRIC POWER RES INST
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