A dynamic parameter identification method for a solid rotor large-scale condenser

Abstract

The invention discloses a dynamic parameter identifying method of a large solid rotor phase modifier. The method includes the steps that when the large solid rotor phase modifier is in a static state,alternating current voltage with a certain frequency is added to the phase a and the phase b of an armature winding, a rotor is dragged, and the rotor of the large solid rotor phase modifier is fixedto the position with the minimum induction voltage of an exciting winding; the exciting winding is subjected to short-circuit, a sinc signal is input between the phase a and the phase b of the armature winding, and d axis current of the large solid rotor phase modifier with the rotor located at the current position is determined according to obtained current of the phase a of the armature winding; an expression of d axis operation reactance is determined when it is considered that multiple damping windings exist on the d axis; and frequency domain transformation is carried out on the d axis current under the time domain, the d axis current under the frequency domain is expressed in the form of a rational fraction by utilizing Pade approximation, d axis operation reactance is obtained according to the d axis voltage balance relation, and thus reactance of all orders of the d axis and corresponding time constants are determined. The method is simple, convenient, practicable, good in safety and high in precision.

Description

technical field [0001] The invention belongs to the field of parameter identification of motor tests, and more specifically relates to a dynamic parameter identification method of a solid rotor large-scale regulator based on sinc signal voltage injection and Padre approximation. Background technique [0002] In view of the long-standing problem of insufficient dynamic reactive power compensation capability in my country's existing UHVDC power transmission projects, a solid rotor large-scale condenser with high dynamic response capability and large reactive power compensation capacity is regarded as an effective measure to solve such problems. And it will be widely installed in converter stations of UHV DC transmission projects. [0003] The excellent dynamic reactive power output characteristics of the solid rotor large-scale condenser are closely related to the performance parameters of its main engine, especially the dynamic parameters of the d-axis. Therefore, in the manu...

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Problems solved by technology

[0007] Aiming at the above defects or improvement needs of the prior art, the present invention provides a dynamic parameter identification method of a solid rotor large-scale condenser, thereby solving the problem of using the three-phase sudden short-circuit test and the least squares method in the d-axis dynamic analysis of a solid rotor large-scale condenser. The technical problems of parameter identification are complex operation process, damage to the motor and low accuracy

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