Coordinated control method, frequency converter, excitation equipment and static variable frequency starting system

Abstract

The invention provides a coordinated control method, a frequency converter, excitation equipment and a static variable frequency starting system. The static variable frequency starting system comprises the frequency converter, the excitation equipment, a monitoring system and synchronous grid-connected equipment. Coordinated control of the frequency converter and the excitation equipment can be realized, and different operation modes can be selected according to different operation conditions of the synchronous motor so that the operation mode is flexible, the operation range is wide and operation has high reliability. Before the first critical switching point of the synchronous motor, the frequency converter and the excitation equipment are independently controlled so that the interference of harmonic waves and other external clutters on the analog signals can be effectively reduced, the accuracy of excitation control can be enhanced and thus the success rate of commutation of the frequency converter in the pulse commutation phase can be enhanced. Besides, the control process is simple and clear, control is facilitated and the starting rate and the stability of the synchronous motor in the natural commutation phase can be enhanced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a coordinated control method, a frequency converter, an excitation device and a static variable frequency starting system. Background technique [0002] Large-scale AC synchronous motors are widely used in industrial high-power occasions such as gas-fired power generation, pumped storage, and large-scale oil and gas transportation due to their advantages such as adjustable power factor and high motor efficiency. Their operating power is generally tens to hundreds of megawatts. The large amount of energy consumption caused by the difficulty of starting synchronous motors has been widely concerned. The starting methods of synchronous motors can be divided into mechanical and electrical. The mechanical starting method mainly uses a coaxial additional starter motor to drive the start of the entire unit. The electrical starting method mainly uses frequency conversion speed r...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art that the coordinated control process between the synchronous grid-connected equipment, the excitation equipment and the frequency converter is too complicated, it is not conducive to control and the control effect is poor, the present invention provides a coordinated control method, frequency converter, and excitation equipment And static variable frequency starting system, static variable frequency starting system includes frequency converter, excitation equipment, monitoring system and synchronous grid-connected equipment, monitoring system is used to provide selection instructions and electric working condition start instructions to frequency converter and excitation equipment The confirmation information returned by the equipment and the start-ready signal of the electric working condition, the synchronous grid-connected equipment is used to receive the grid-connected request command sent by the frequency converter and send the excitation adjustment signal and the speed adjustment signal to the excitation equipment and the frequency converter respectively to realize the grid connection of the synchronous motor , realize the coordinated control of the frequency converter and the excitation equipment, and the control process is simple and clear, which is beneficial to the control

Images