SU1281755A1 - Device for controlling compressor - Google Patents

Abstract

The invention relates to the field of compressor control. The aim of the invention is to improve the accuracy of adjustment. The device contains a compressor capacity control unit, to the input of which a mode control unit is connected, equipped with three inputs. To the first input is connected the active power sensor of the driving motor, to the second - the setting knob, to the third - the frequency sensor of the power system with a proportional output signal. The inputs of the control unit, to which the active power sensor and the frequency sensor are connected, have opposite signs. Increasing (decreasing) the frequency of the power system increases (decreases) the capacity of the compressor and thus the power of the compressor drive motor. I il. AT

Description

Hche

ace

 ate

sd

This invention relates to compressor control.

The aim of the invention is to improve the accuracy.

The drawing shows a block diagram of the proposed device.

The device for controlling the compressor 1 with the electric drive 2 and the capacity regulator of the compressor 3 installed at the entrance to the compressor contains a power sensor 4 and a drive electric power adjuster 5 connected to the adder 6, a relay regulator 7 connected with the first input to the adder, and output - to the actuator 8 of the throttle valve, as well as the sensor 9 of the frequency of the electric supply network and the functional converter 10. In addition, the drawing shows the power amplifier 11 and the reverse clanan 12.

The device works as follows.

The compressor with electric drive 2 is used to inject air into the underground tank of an air-accumulating power plant or to inject fuel gas into the underground tank. This mode corresponds to the excess power of the power system.

Air blown by compressor 1 passes through throttle valve 3, through check valve 12 and is pumped into an underground tank. Check valve 12 prevents air from exiting the underground tank through an idle compressor.

The throttle valve 3 is opened by the actuator 8 by the signal of the relay regulator 7. The actuator 8 is fixed at zero signal at the output of the relay regulator 7 and, accordingly, at the output of the power amplifier 11. The signal from sensor 9 of the frequency of the power supply network drives to the functional converter 10, which implements the function of the "dead zone" type, the output of which is fed to the relay controller 7 (for example, type P21 of the "Cascade" system).

As long as the output signal of frequency sensor 9 does not go beyond the dead zone of the functional converter 10, it does not pass to the input of relay controller 7. In this case, the zero signal at the output of relay controller 7 corresponds to the output signals of the setting device 5 and sensor 4 of the drive power of the electric drive 2,

i.e., the power of the electric drive 2 is kept constant in accordance with the setpoint 5 signal and determines the performance of compressor 1. If the frequency deviation of the power supply network from the setpoint exceeds the deadband of the function converter 10, the signal of the sensor 9 passes to the input of the relay controller 7.

If the frequency of the mains supplying electric drive increases (which corresponds to an increase in the excess power of the power system), the signal from sensor 9 increases and the output of relay controller 7 produces a nonzero signal acting on drive 8 in order to open throttle 3 and a concomitant increase in power of compressor 1 and electric drive 2

The increase in power of the electric drive 2 leads to an increase in the output signal of the sensor 4.

Since the signals of sensors 4 and 9 are fed to the relay controller 7 with opposite signs, the growth of the output signal of sensor 4 compensates for the growth of the output signal of sensor 9, which leads to the restoration of a zero signal at the output of the relay controller 7.

Thus, without affecting the setting device 5, with an increase in the frequency of the power system, the power of the electric drive of the co.amper increases within acceptable limits.

When reducing the frequency of the power supply network, the relay controller, respectively, reduces the power of the compressor electric drive.

Claims (1)

Invention Formula A device for controlling an electrically-driven compressor with a compressor capacity regulator, comprising a sensor and a drive power of an electric drive connected to an adder, as well as a relay controller connected by a first input to an adder, and an output to a throttle actuator, characterized in that increase accuracy, it additionally contains a frequency sensor of the power supply network and a functional converter connected by an input to the frequency sensor, and an output - to the second input of the relay relay Street torus.