Motor aggregation method considering system stability and electromagnetic property

Abstract

The invention relates to a motor load aggregation method for an electric system and belongs to the field of load modeling for the electric system. The method includes the steps that firstly, according to main motor parameters affecting the stability of the electric system, two groups of good system stability and poor system stability are obtained through division; then, according to actual operation conditions of all motors, electromagnetic and mechanical characteristics of motor rotors are comprehensively considered, the initial slip frequency for an aggregated motor is obtained through solving, and then electric parameters of the aggregated motor are obtained through solving and include stator reactance, rotor reactance, excitation reactance, rotor resistance and an inertia tie constant; finally, the method is verified through a calculation example model. The result shows that the method is high in aggregation precision and small in calculation amount, original motor groups are simulated through two equivalent motors adopted for aggregation, errors are smaller than the errors caused by the adoption of a single equivalent motor, and the method is suitable for transient stability analysis.

Description

technical field [0001] The invention relates to a motor aggregation method in a power system, in particular to a motor aggregation method taking into account system stability and electromagnetic characteristics. [0002] Background technique [0003] The power load is an important part of the power system. The power load model has a certain influence on the power flow calculation, short-circuit calculation, stability and safety analysis in the power system. Load modeling has become a constraint on the accuracy and credibility of power system simulation calculation results. key factor. [0004] Induction motor is the most important dynamic component in electric loads (especially industrial loads), and its model parameters have an important impact on the accuracy of power system simulation, especially the accuracy of transient stability simulation. In view of the large number of motors, many types, scattered locations, and the limitation of computer storage capacity and calc...

AI Technical Summary

Problems solved by technology

However, at this stage, most of the research on motor aggregation does not consider its electromagnetic transient characteristics, resulting in low aggregation accuracy, and a few aggregation methods based on transient models are often computationally complex, and the accuracy is greatly affected by the initial value of the parameters.

[0005] On the other hand, different motor parameters have different system stability, and the influence of each parameter on system stability is also different, which will affect the aggregation accuracy to a certain extent.

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