A doubly-fed motor testing system and testing method thereof

Abstract

The invention discloses a testing system for a double-fed motor and a testing method thereof. The system disclosed by the invention comprises a generator unit, a motor unit and a system starting unit, wherein the generator unit comprises a motor A and a double-fed frequency converter A; the motor unit comprises a motor B and a double-fed frequency converter B; the system starting unit comprises astator short circuit contactor A and a stator short circuit contactor B; and the motor A and the motor B are double-fed motors of the same specification and model and are in rigid connection through a coupling. The method disclosed by the invention comprises a stator short circuit rotor frequency conversion operating mode and a double-fed operating mode. In the invention, the short circuit is carried out on a stator assisting to test the motors, and a rotor is controlled by the double-fed frequency converters, thereby realizing the self-starting of a towing system. According to the invention,the problems that the speed regulation range is narrow and the double-fed motors cannot be started in the double-fed operating because of the limit of the rotor output voltage of the double-fed motors are solved; and the starting and low-speed operating of the system are realized by changing the control method of the double-fed motors, and the test cost is greatly saved.

Description

technical field [0001] The invention relates to an electric power enclosed torque testing system, in particular to a doubly-fed motor testing system and a testing method thereof. Background technique [0002] The motor is one of the most important equipment in the wind turbine. It not only determines the power quality of the entire unit, but also affects the service life of the fan. Therefore, before the final assembly of the fan, it is necessary to test the performance of the motor, including load test, temperature rise test, variable speed and constant frequency test, etc. In order to meet the performance test of doubly-fed motors, it is necessary to design a test platform that can simulate wind energy and apply different torques to doubly-fed motors at different speeds. [0003] The current test plan is to use a full-power frequency conversion speed regulation system for testing, such as figure 1 As shown, the tested motor is a double-fed motor, and the rotor current of...

AI Technical Summary

Problems solved by technology

The tested motor and the accompanying motor are connected to the shaft. Although this scheme has a simple structure and a wide range of speed adjustment, it has the following problems: the accompanying motor needs to be driven by a full-power frequency converter, and the equipment cost is high; because the accompanying motor is an asynchronous squirrel cage The specification and model of the motor is different from that of the tested motor. On the premise of not changing the tooling, only one double-fed motor can be tested at a time. The test tooling is complicated, which affects the test efficiency.

This makes the entire system configuration cumbersome and increases equipment costs

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