Impedance test system and method for three-phase alternating current circuit

Abstract

The invention discloses an impedance test system and method for a three-phase alternating current circuit. The system comprises a disturbing signal injection module, a signal processing module, a signal amplification module, a signal detection module, a frequency responding measuring module and an impedance calculation module; the method comprises the steps that step one, a disturbing signal is generated; step two, the disturbing signal in a dp coordinate system is converted into an abc three-phase alternating current signal; step three, the disturbing signal is amplified and injected into thethree-phase alternating current circuit; step four, the signal detecting module measures a voltage signal of a power supply and a port responding signal and conducts smoothing adjusting on the signals; step five, the port responding signal is transformed to the dq coordinate system from an abc coordinate system; step six, frequency responding is obtained; step seven, impedance of the three-phasealternating circuit is obtained through calculation. The design is novel and reasonable, three-phase alternating current impedance can be conveniently and accurately tested, important significance isachieved on analyzing of stability of the three-phase alternating current circuit, the practicability is high, and the popularization and application value is high.

Description

technical field [0001] The invention belongs to the technical field of impedance testing, and in particular relates to a three-phase AC circuit impedance testing system and method. Background technique [0002] The distributed power supply system has the advantages of high reliability, easy modularization and easy maintenance. It is more and more respected and welcomed by the industry. It is widely used in spacecraft, ships, communication base stations and large computer power supply systems. In a distributed power supply system, each device is designed independently by different suppliers, and the design only ensures its own stable operation. When cascaded into a system, the system performance will decline or even appear due to the negative input impedance characteristics of constant power loads. System instability. [0003] The impedance stability criterion is widely used in DC systems. When studying the power system of the space station, Professor Fred C.Lee did a lot o...

AI Technical Summary

Problems solved by technology

Coordinate transformation requires the use of the rotation angle of the AC system. The rotation angle is generally obtained through a phase-locked loop, but the disturbance signal will affect the accuracy of the phase-locked loop, thereby affecting the measurement results

On the other hand, since the dq coordinate system is a virtual coordinate system, the three-phase AC circuit cannot directly perform signal analysis and subsequent testing in this coordinate system

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