High-power synchronous machine variable-frequency speed regulation system for finishing rolling unit

Abstract

The invention discloses a high-power synchronous machine variable-frequency speed regulation system for a finishing rolling unit, which comprises a frequency converter system, a variable-frequency speed control system, a control system and an energy feedback system. The frequency converter system, the variable-frequency speed control system and the energy feedback system are respectively connectedin series with the control system. The variable-frequency speed control system includes a controller, a frequency converter, a power unit and a double-winding motor. The variable-frequency speed control system includes a VFD, an excitation system, a synchronous motor winding and a controller. The excitation system includes a power inverter device. The control system includes a main controller, arotor, an encoder and a synchronizer. The main control system includes a DSP and an FPGA. The energy feedback system mainly includes a frequency converter. The high-power synchronous machine variable-frequency speed regulation system mainly adopts a seven-level unit cascaded frequency converter to drive a two-winding synchronous motor, which not only has the function of energy feedback, but also adopts a vector control method. The high-power synchronous machine variable-frequency speed regulation system also cooperates with the excitation system to provide excitation and realizes online acceleration and deceleration of the finishing rolling unit.

Description

Technical field [0001] The invention relates to the field of frequency conversion control, and more specifically, to a frequency conversion speed regulation system for a high-power synchronous machine used in a finishing mill. Background technique [0002] Medium voltage frequency conversion speed regulation technology has broad application prospects in high-power fans, pumps, high-power electric locomotive traction, electric propulsion systems of large ships, and steel rolling industry. In the above occasions, the application of medium voltage frequency conversion speed regulation can not only save energy, but also can significantly improve the running performance of the motor. [0003] With the rapid development of new power electronic devices in the direction of high voltage and large current, multi-level topology inverters are called the first choice for medium voltage variable frequency speed control main circuits, and multiple motors can use the same capacity motors without i...

AI Technical Summary

Problems solved by technology

[0005] At present, especially in the application field of cascaded multi-phase high-power finishing rolling frequency converters in my country, the common problems of high energy consumption, weak operation performance, and pollution caused by high-order harmonics to the power grid have not been effectively solved.

Images