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Application of static phase advancer in local compensation of motor reactive power

2019-09-26

The static phase advancer is any reactive power compensation device that uses the principle of the frequency converter. It is connected to the motor rotor control loop of communication and entangled asynchronous motor, which is used to improve the power factor of the motor, give full play to the development potential of the power supply system of the current power supply equipment, reduce the power engineering loss, and then exceed the actual effect of environmental protection and energy saving, and enhance the company. Economic benefits.

At this stage, there are two key methods for the reactive power compensation of the entangled asynchronous motor in the world: A, the stator side parallel capacitor of the motor; B · the generator rotor control circuit is connected to the double turntable phase-input device. Parallel capacitors only compensate for the reactive power of the route, and can not reduce the amount of stator current of the motor; especially in the place where the high-voltage capacitors are placed and operated, the project investment is usually higher than the normal phase-input equipment. The original rotary-type phase-input device is such a commutator-rotating motor, which is very afraid of floating dust, has a short application cycle, and has few specifications and models, and cannot be paired with an asynchronous motor. The stationary immovable phaser is a new environmentally-friendly and energy-saving device that basically develops in the two types of reactive power compensation devices. It adopts the principle of AC-AC inverter, which is very easy to adjust the main parameters, is not afraid of floating dust, long service life, convenient maintenance and other characteristics, and can be applied to various mechanical equipment loads. 2 principle

The schematic diagram of the main control loop control circuit of the static phase advancer is shown in Fig. 1. It converts the single-phase electric 380v AC current according to 12 thyristors and 6 equalizing reactors, which is converted to the same as the generator rotor frequency (fi · s~ Three-phase circuit of IHZ). The electric commodity circulation motor rotor control circuit, in turn, causes a leading motor rotor potential difference of nearly 90 in the motor rotor control loop. The additional potential difference of the electrical angle improves the power factor of the motor. The size of the EK is the size of the soft starter switching power supply U2 and the size of the thyristor opening angle.

From the system block diagram, the sampling data signal control loop is solved according to the generator rotor current data signal and the additional potential difference data signal, and the result is given to the logic discrimination control loop; the logic discrimination control loop is operated according to the maintenance command, and the trigger is turned on. The opening angle of the silicon is controlled, and then an additional field current I' is obtained in the rotor control loop of the motor. . In order to maintain Il + 12:I. Will not change, 12 boost, h will be reduced; therefore reduce the motor stator current, reduce the power factor angle, increase the power factor COSVI. See Figure 3 because the excitation current is maintained at 1. The slip rate does not change, thus ensuring that the motor load ratio and speed ratio do not change. 2 · 2 compensation features

As a result, the working voltage is gradually increased, the reactive power on the stator side of the motor is gradually reduced, the power factor is gradually increased, and the motor stator current is gradually reduced. When the compensation working voltage rises to the necessary value, the reactive power on the stator side of the motor decreases to the point where the power factor rises to approximately 1.



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