Electromechanical transient synchronous machine model and initial q-axis saturation parameter determination method

Abstract

The invention provides an electromechanical transient synchronous machine model and an initial q-axis saturation parameter determination method. According to the electromechanical transient synchronous machine model, dichotomy is adopted to initialize saturation effects and excitation and damping leakage reactance are considered. The model is mainly characterized in that mutual leakage reactance between excitation and damping windings in a rotor potential equation represents to be only interlinked with the excitation and damping windings but does not pass through a magnetic flux leakage chain of a stator coil; and the dichotomy is used for determining the initial power angle and the initial q-axis saturation armature reaction reactance. According to the model and the parameter determination method by the model, the dichotomy is adopted to initialize the q-axis saturation reactance and the power angle, the difficult problem of using an armature reaction reactance correction mode to consider the saturation influences is solved, and for the first time, using the armature reaction reactance correction mode to consider the saturation influences in a domestic practical electromechanical transient stability analysis program is realized.

Description

technical field [0001] The invention relates to the detection field of photovoltaic grid-connected inverters, in particular to an electromechanical transient synchronous machine model and a method for determining initial q-axis saturation parameters. Background technique [0002] The traditional synchronous machine model used in electromechanical transient stability analysis widely used in power system is attached Figure 4 Shown in [1-7]. The model is based on the following assumptions: the mutual inductance flux linkage between the coils on the same axis, that is, the mutual reactance is equal, and the mutual reactance is equal to the armature reaction reactance, that is, for the d-axis, there are mutual leakage between the stator winding, the excitation winding and the damping winding Resistance is 0. In fact, the mutual leakage flux between the stator winding and the rotor winding needs to cross the air gap, and the corresponding leakage reactance value is small, which ...

AI Technical Summary

Problems solved by technology

The drawback of considering saturation in a way that modifies the armature reactance reactance is that it complicates the analysis, most notably the initialization

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