Permanent magnet speed regulation system of power plant auxiliary equipment

Abstract

The invention discloses a permanent magnet speed regulation system of power plant auxiliary equipment. The system comprises a prime mover, a permanent magnet speed regulation module, the power plant auxiliary equipment, a first non-contact velocity transducer, a second non-contact velocity transducer, an auxiliary equipment state monitoring sensor, an air gap adjusting mechanism, a TMS320F28335 intelligent controller, a GPRS wireless communication module, and an HMI touch display screen. According to the system, based on the permanent magnet speed regulation theory with variable rotating speed and torque, the gap between a conductor rotor and a permanent magnet rotor of the permanent magnet speed regulation module is changed through the air gap adjusting mechanism with the combination of the modern intelligent controller and the non-contact speed detection sensor technology, and the non-contact power plant auxiliary equipment permanent magnet speed regulation system is realized. According to the system, the effects of energy saving and consumption reduction are good, the stalling accidents of auxiliary equipment units of the power plant caused by insufficient low-voltage ride-through capability of a frequency converter can be avoided, and system vibration, noise, and electromagnetic harmonic pollution can be reduced to a certain extent.

Description

[0001] Technical field: [0002] The invention belongs to the field of speed regulation of power plant auxiliary machines, in particular to a permanent magnet speed regulating system of power plant auxiliary machines. [0003] Background technique: [0004] The normal operation of the auxiliary equipment of the power plant is the premise to ensure the safe operation of the power system and electrical equipment. Due to various faults in the power system, the low voltage ride through phenomenon occurs in the power plant, and the short-term voltage drop (low voltage ride through) of the power plant will cause The protection action of the frequency converter of auxiliary equipment in the power plant will directly cause the auxiliary equipment driven by the frequency converter to stop running, and further continuation will cause serious accidents such as grid oscillation and power plant unit disconnection. Therefore, it is urgent to study new anti-low voltage equipment for auxiliary ...

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Problems solved by technology

[0005] (1) The anti-low voltage ride-through transformation of the frequency converter in the existing technology needs to carry out the early stage transformation design and the post-stage routine maintenance of the frequency converter, and additionally add power electronic equipment to further increase the technical difficulty and the operation and maintenance costs of auxiliary equipment in the power plant; (2) The circuit structure of the frequency conversion speed regulation system of the traditional power plant auxiliary equipment is complicated, and a variety of easily damaged power electronic components will reduce the reliability of the frequency conversion system, and the flexibility is poor

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