Application of Steel Brushless Excitation in Air Compressor System Wang Guangyou Xiu Rong Maanshan Iron and Steel Group Corporation startup and control method, providing reference for the application of brushless excitation in production. The key skill synchronous motor brushless excitation diode 1 front mu synchronous motor has reactive power compensation ability, "improve the power factor of the grid, so that the purpose of the machine can be achieved. Synchronous motors have a wide range of applications in power-driven systems that require no speed regulation and high power. The performance of the excitation device directly affects the reliability and stability of the synchronous motor operation. At present, in the system of large-scale fan, water tired, compressor and the like driven by synchronous motor, the brushlessization of synchronous motor excitation is an important direction of its development. Because the brushless excitation eliminates the brush and the collector ring, it extends the continuous running time of the synchronous motor, reduces the maintenance of the motor, and can bring other benefits in the series. Therefore, brushless excitation is currently the popular solution for large synchronous motors. This paper introduces the brushless excitation device of the synchronous motor of H Wanwu air compressor of Maanshan Iron and Steel Co., Ltd. The electronic control system of the synchronous motor is a complete set of equipment imported from Alstom, France. 2 main rejuvenation composition and starting method Wanwu air compressor synchronous motor is started by self-heating transformer step-down mode. Its electrical schematic is shown in Figure 1. When the speed of the rotor does not reach the rated speed of the synchronous motor 25, the rotor lock signal is issued by the speed controller to cause it to trip. When the rotor speed exceeds 25 of the rated speed of the synchronous motor, the synchronous motor continues to operate. When the speed rises to 95 of the rated speed, the full-skin signal is sent out by the speed control. At this time, the neutral circuit breaker 6 is tripped, and the delay 18 is closed, so that the synchronous motor is fully pressurized. Violation, when the speed reaches the rated speed of 98, the excitation controller sends a signal to the excitation contactor K221. At this time, the entire excitation device is powered and the DC power is supplied to the excitation winding of the exciter, so that the synchronous motor enters the synchronous running state, and the entire starting process ends. 3 Ingenious Recursive Implementation and Control Method The main circuit of the excitation device uses a single-phase half-controlled bridge rectifier to supply the excitation winding of the exciter. That is, under the condition of normal excitation, the chemical pulse sent by the control unit is applied to the intergranular junction of the single-phase half-controlled rectifier bridge, and the excitation machine enters the normal excitation process, and the voltage of the rectifier bridge output is: /1=.4513. Its structure diagram is shown as circle 2. Among them, the single-phase rectification and voltage-changing secondary voltage, "the angle of the intergranular tube. The exciter is a synchronous generator, the stator of which is an inductive winding, and the excitation current of the exciter is supplied by a variable voltage which is derived from the single-phase half-control bridge. The rotor winding of the exciter, the rotary diode rectification 3 and the rotor winding of the synchronous motor are coaxial, and the = phase AC voltage from the rotor of the inductive machine is supplied to the excitation winding of the synchronous motor via six rotary dipoles, which realizes Brushless excitation of synchronous motors. The system adopts the control mode of the two states. That is, the turbulence control mode in the manual state, the constant reactive power control mode in the automatic state, and the constant power factor control mode. In the manual state, the device adopts the constant current control mode, which uses the current as the feedback amount and compares it with the excitation current given amount. The tube trigger angle to make the excitation current. the way. It compares the reactive current of the stator current of the synchronous motor in the current and voltage sensors with the set value. When the synchronous motor is under different load conditions, if the reactive current of the output changes, the change is made. The magnitude of the excitation current automatically stabilizes the reactive current output value near the given value. 4 Protection in the system In this system, in order to improve the workability and safety of the system, the system is provided with: rotor grounding protection, reverse power protection, out-of-step protection, rotating diode fault protection 11 and excitation It is over-voltage, under-current, over-current protection, etc. And all these protection signals are sent to the cabinet to display the light and the audio message, so the maintenance personnel will deal with it in time, and some fault information will be sent to the system of the central control room for monitoring. 5 clever theory This paper only introduces the original and implementation methods of the synchronous motor brushless excitation system. However, in the current large-scale synchronous motor drive system of Maanshan Iron & Steel Co., Ltd., in addition to the synchronous motor of the gas supply factory H Wan five air compressor, the synchronous motor of the 2500 3 blast furnace fan is brushless. . From the operation of these two systems, their performance and system adjustment skill are high, and the work can be skillful. Since the operation of the investment, it has been no problem.
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