SU1701989A1 - Method of control of compressor station - Google Patents

Abstract

The invention relates to the field of compressor station control. The aim of the invention is to expand the zone of stable operation of the compressors. The goal is achieved in that in the method of regulating compressors 3, equipped with bypass valves 4 and actuators 5 with sensors 6 and speed regulators 7, by measuring sensors 8. 9 gas pressure respectively at the inlet and outlet of the compressor, as well as differential sensors 10 the gas pressure at the input measuring diaphragm of the compressor, the formation of the measured values of the control signals and the signals correction task

Description

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The rotational speed of the drives, and when the control signals exceed the control setpoints for opening the bypass valves of each compressor, the gas pressure in the output manifold 2 is additionally measured, compared with the setpoint, and the reference correction signal for

Each drive speed regulator is formed by calculator 21, depending on the set value and the difference between the set and measured gas pressure values in the output manifold obtained on the second element of comparison 20. 3 il.

This invention relates to compressor control.

The aim of the invention is to expand the zone of stable operation of the compressors.

Figure 1 presents the block diagram of the device that implements the method; 2 is a block diagram of a control unit; FIG. 3 is a block diagram of a calculator.

A device for regulating a compressor station, comprising compressors 3 combined with an inlet manifold 1 and an outlet manifold 2, equipped with bypass valves 4 and actuators 5 with sensors 6 and rotational speed regulators 7, contains an inlet gas pressure sensor 0 and a gas pressure sensor 9 for each compressor at the outlet of the compressor, the gas pressure differential sensor 10 at the compressor inlet diaphragm, the anti-surge controller 11, the first element of comparison 12 and the control unit 13, including (figure 2) multiplier 14, sum Ator 15, divider 16 and selector 17, as well as common for all compressors gas pressure sensor 18 in the output manifold, the first unit 19, the second element of comparison 20 and the calculator 21, which includes (fig. 3) unit 22, the third unit 23, the third element of comparison 24, the fourth comparison element 25, as well as the multiplication blocks 26-28 and multiplication units 29-31, the number of which corresponds to the number of compressors.

The method is implemented as follows.

When the compressor station is operating in nominal mode, sensors 10 and 8 of each compressor unit are continuously measuring, respectively, the flow rate and gas pressure at the compressor inlet 3, sensors 9 and 18 — the gas pressure at the outlet of each compressor and at the compressor station outlet, respectively, sensor b - shaft speeds of each compressor. Measured by sensors 10, 8 and 9 of the current values of gas flow and pressure at the outlet to the compressor and gas pressure at the outlet of the compressor and the specified value of the surge limit in the control unit 13 of each compressor unit, the TO of the distance from the operating point of the compressor . In this case, in the control unit 13, the dependence

.BUT

where to - the value of the distance of the working

points from a given surge boundary;

Pi. P2 - gas pressure, respectively, at the inlet and outlet of the compressor;

h is the gas flow rate at the compressor inlet: K is the specified value of the surge limit.

The negative value of distance obtained in the calculation corresponds to finding the operating point of the compressor in the working area, and a positive value in the non-working area. By a positive value, an anti-surge control of the compressor is made, by a negative value - the formation of a driving effect on

changing the mode of operation of the compressor according to the principle: with a decrease in the magnitude of the distance, the magnitude of the increment of the driver action is correspondingly reduced.

In this case, a signal proportional to kh is formed at the output of the multiplier 14, and a signal proportional to P2 - Pi - Kh is formed at the output of adder 15. and the output divider 16 is proportional to. In this case, the selector 17 selects a negative

sign, the TO signal corresponding to the area of stable operation, and feeds to the calculator 21 to generate a drive speed correction signal. A positive TO value is used in

as a control signal for the anti-surge controller 11., which opens the bypass valve 4 to the required value, depending on the positive output of the control unit 13, performs the most bypass of the working fluid from the output to the w / o compressor and increases the stability of the compressor.

The measured value of the gas pressure at the outlet of the compressor station measured by the sensor 18 is compared in the second element of the comparison 20 with the value of this pressure set by the first unit 19. Based on the comparison of the mismatch value, the gas pressure at the outlet of the compressor station, specified by the first unit 19, and calculated for each compressor by unit 13, control of the distance between the operating point and the specified pump boundary in the calculator 21 at the output of the compressor station and the frequency of rotation of the shaft of the compressor, optimal for each compressor are formed, which determine the effect on the change in the operating mode of the compressors 3 of all compressor units anovok. In this case, in the third comparison element 24, the calculator 21 compares the output signals of the second unit 22 of the limiting gas pressure at the outlet of the compressor station and the first unit 19 of the current value of this pressure, and in the fourth element of the comparison 25, compares the output signals of the third unit 23 of the limit frequency rotation of the compressor shaft and the third element of the comparison 24, in blocks 26-28 - multiplication of the output signal of the second element of the comparison 20 by the calculator 21 output corresponding to each channel the common signals of the control units 13 (output signals of the selectors 17). in blocks 29-31, the algebraic summation of the output signals of the fourth element of comparison 25 and the multiplication blocks 26-28 corresponding to each channel are multiplied. The output signal of the fourth element of comparison 25 is generated by the output signal of the first setter 19, taking into account the output signals of the second and third setters 22 and 23, and is common to all compressors determining the establishment of the nominal mode of operation, and the output signals of the summation blocks 29-31 are generated taking into account the continuous operation mode of each compressor, i.e. taking into account the change in the load of each comp

spring, and therefore are the optimal driving effects on changing the operating mode of the compressors.

Measured by the sensor 6 of each compressor unit, the current value of the rotation frequency of the compressor shaft is compared in the first element of comparison 12 with the setting effect on the change in operating mode generated by the calculator 21 for the compressor. According to the obtained comparison result (error signal), the rotation speed controller 7 controls the actuator actuator 5 of the compressor appropriately, ensuring the required change in the operating mode of the compressor.

Thus, individual correction of the rotational speed of each compressor is carried out taking into account the overall mode of operation of the compressor station, ensuring the expansion of the zone of stable operation of the compressors.

Claims (1)

Invention Formula The method of controlling the compressor station, which includes the compressors combined with the inlet and outlet headers, equipped with bypass valves and actuators and rotational speed controllers, by measuring the gas pressure at the inlet and outlet of each compressor, as well as the pressure drops of the gas at the input measuring diaphragms of the compressors, forming the measured values of control signals and correction signals for setting the speed controllers of the drives and when the control si The control value of opening the bypass valves of each compressor, characterized in that, in order to expand the zone of stable operation of the compressors, the gas pressure in the outlet manifold is additionally measured, compared with the set value, and the setpoint correction signal for each speed regulator of the drive is formed depending on the set the value and the obtained difference between the specified and measured gas pressure values in the outlet manifold. (Reg. I