Direct-drive fan impedance hardware-in-the-loop test system and method

Abstract

The invention discloses an on-loop test system and method for direct-driving fan impedance hardware. The system comprises an electric and electronic real-time simulation platform, where real-time digital simulation models of a power grid, a small signal voltage source or current source for testing impedance, a shafting of a wind turbine generator system, a motor, a main circuit of a current transformer, a protection circuit and a filtering branch are established, wherein the real-time digital simulation models after being subjected to real-time transformation are downloaded to a simulation machine of the electric and electronic real-time simulation platform, a direct-driving fan controller to be tested is connected with the real-time digital simulation model through an input / output interface of the simulation machine. On-loop test of the direct-driving fan impedance hardware can be realized in a simple and flexible way, which approaches engineering reality, so that the test result is more accurate.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a direct-drive fan impedance hardware-in-the-loop testing system and method. Background technique [0002] Impedance is a fundamental characteristic of electrical systems. At present, impedance-based system stability analysis is a hotspot in academic research, and it has been used to solve the problem of system stability analysis including power electronic equipment. Therefore, it is of great significance to calculate or measure the impedance of various electrical equipment, and the calculation or measurement of the impedance of the direct drive fan is very important for the stability analysis of the power system including the direct drive fan. [0003] At present, there are several problems in the calculation or measurement of direct drive fan impedance. First, the theoretical calculation method is used to calculate the impedance of the direct-drive fan, which is curre...

AI Technical Summary

Problems solved by technology

First, the theoretical calculation method is used to calculate the direct drive fan impedance, which is only applicable to the classic direct drive fan model at present, without considering the actual filtering branches and other links, and the models of different manufacturers are quite different

Second, at present, there are few academic studies on the impedance of direct-drive wind turbines. Only the impedance of voltage source converters has been discussed, which cannot reflect the impedance of direct-drive wind turbines.

Third, the time-domain simulation method is used to measure the impedance of the digital model of the direct-drive fan. Due to certain differences between the digital simulation and the actual engineering, the impedance measured by this method has limited guiding significance for the actual engineering.

Fourth, test the impedance of the direct-drive fan for the physical system built in the laboratory. This method is difficult to implement, and the entire system including the direct-drive fan needs to be built, and the operation is complicated.

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