RU2736136C1 - Method of automatic control of gas condensate supply process into main condensate line - Google Patents

Abstract

FIELD: gas industry.

SUBSTANCE: invention relates to production and preparation of gas condensate for long-distance transport. Method of automatic control of the process of supply of gas condensate to the main condensate line (MCL) includes an automated process control system (APCS) controlling operation of parallel operating units. Each of the units is connected to the suction pipeline, and their pressure pipelines enter the collector MCL. MCL is equipped with a condensate flow rate transducer behind the header. Electric motor (EM) of each unit is connected to individual frequency converter and is equipped with current sensor in its power supply line. Change in EM rotation speed is generated by an individual proportional-integral-differentiating PID-controller. APCS, having received the task of performance of integrated gas treatment unit, divides all ready-to-operate pump units into three groups. First group includes one pump unit – the main one. Second group includes units which, together with the main unit, will make a plan for feeding condensate into the MCL. This group APCS defines as operating. Third group APCS assigns to the group of backup and will use them if necessary. APCS division into groups is performed by means of two switching units connected to PID-controller of each unit. First switching unit commutes one of two types of setting signal and supplies the required setting signal to the input of its PID controller SP depending on the group where the unit is switched on. Second switching unit commutes one of two types of feedback signal and sends the selected signal to the PV feedback input of its PID-controller depending on the group, into which the unit is connected. Upon the command to start the system, the APCS includes the main unit by sending the signal of the plan for pumping of condensate to the MCL, which is set by the dispatcher of the gas producer, with the help of the first switching unit to the SP input of its PID-controller. Simultaneously, using the second switching unit, APCS sends signal of gas condensate flow rate sensor to MCL to input feedback of PV of PID controller of the main unit. After the main pump unit goes into operating mode, APCS sequentially starts pump units from the group of operating units. For this purpose, using the first switching unit, it sends to the input of SP setting of their PID-controllers a signal equal to the value of average current in power lines of the main unit and connected in parallel to it pump units from the group of working together with the unit connected to them. At that, value of average current of APCS is calculated by formula taking into account current value in power supply line EM of main unit, value of current in power supply line of EM i-th connected and connected unit from working group. And to the PV feedback input of these PID-controllers APCS, using their second switching units, sends a signal from current sensors installed in power supply line of EM units controlled by them. At that, APCS monitors all measured parameters and recalculates values of calculated parameters with given periodicity, which guarantees continuous control of technological process.

EFFECT: invention is aimed at maintaining specified flow rate of pumped gas condensate in MCL with high reliability and minimum power consumption by automatic uniform load distribution between units.

5 cl, 1 dwg

Description

The invention relates to the field of production and preparation of gas condensate for long-distance transport, in particular, to the automatic control of pumping units for pumping liquid, providing the supply of gas condensate to the main condensate pipeline (MCP).

There is a method of controlling two parallel pumping units [SU patent No. 1557354], each of which is connected to a pressure suction pipeline by means of direct pipelines connected to bypasses, and is driven by asynchronous motors. In order to improve energy performance by reducing the consumption of reactive energy by induction motors, the load torque of each of these motors is controlled. In case of underloading of one of them, the bypass valve of the fully loaded motor is opened, while the current of the unloaded motor is monitored, and when the current reaches the nominal value, the bypass valve of the fully loaded motor is stopped opening.

The disadvantages of this method are:

- large losses of energy spent on the circulation of the liquid in the system due to the use of bypass lines to distribute the load between the pumping units;

- decrease in the reliability of fluid supply to the manual gearbox due to the use of only two pumping units, since in the event of a failure of one pumping unit, the entire load falls on the second pumping unit, as a result of which the system can enter the operating mode beyond its capabilities;

- uneven loading of pumping units can lead to failure of a more loaded pumping unit earlier than the period regulated by its technical documentation.

The closest in technical essence to the claimed invention is a method for automatic control of the technological process of supplying gas condensate to the MCP (RF patent No. 2647288). The method provides for the control of the capacity of the pumping units operating in parallel, each of which is connected by branch pipes with the suction pipeline, and their pressure pipelines enter the MCP manifold. The common collector to which the pumping units are connected is equipped with a gas condensate flow sensor, and the electric motor (EM) of each pumping unit is connected to an individual frequency converter and equipped with a current sensor in the power supply line. The performance control of pumping units operating in parallel is carried out by changing the frequency of the three-phase supply voltage supplied to the EM of each pumping unit from its frequency converter, while the task to change the frequency of the converter is issued by an individual proportional-integral-differentiating (PID) controller. The operator of the integrated gas treatment unit (GTP) sets the planned value of the condensate flow rate in the MCP to the SP reference input of each PID controller, and a signal from the gas condensate flow sensor installed on the MCP manifold is fed to the PV feedback input of all PID controllers. The value of the proportionality coefficient K _{p_ed} for each PID controller is set by the value of the current in the motor controlled by it according to the functional dependence:

K _{p_ed} = ƒ (A _ed ).

The system is built in such a way that at start-up, to increase the reliability of its functioning, two pumping units are simultaneously launched into operation. If the averaged current values of one of the EM of these two pumping units reach their maximum value, then the automated process control system (APCS) puts the third pumping unit into operation. And if the averaged current values of one of the EM of these three pumping units have reached the maximum value, then the APCS will commission the next pumping unit, etc. And vice versa, if the averaged current values of one of the EM of the pumping units have fallen below their nominal value, then the APCS takes this pumping unit out of operation into reserve, etc. This process continues until two pumping units operate simultaneously in the system. And the total number of pumping units is determined by the capacity of the GPP and the requirements for capacity redundancy for trouble-free operation.

A significant disadvantage of this method is that when the hydraulic resistance changes during the supply of gas condensate from the buffer tank to the MCP, as well as during commissioning or before the decommissioning of the next pump unit, the last pump unit always operates in a light mode, which leads to uneven loading them. This can lead to premature failure of the most loaded pumping unit.

To prevent the ingress of pollutants into the MPC, fine filters are usually installed at the inlet of each pumping unit. Obviously, during operation, these filters are not uniformly contaminated. As a consequence of this, different hydraulic resistances arise at the inlet of pumping units, and as a result, the load on the pumping units changes and becomes uneven. In addition, during commissioning or before the decommissioning of the next pumping unit, the last pumping unit always takes on the load that the previous pumping units could not provide and, as a rule, this load is much less than that of the previous pumping units.

The aim of the present invention is to maintain a given flow rate for pumping gas condensate into the MCP with high reliability and minimum energy consumption by automatically uniformly distributing the load between parallel-connected pumping units (the number of pumping units is determined by the capacity of the gas processing plant in terms of condensate production and the requirements for capacity redundancy for trouble-free operation).

The technical result achieved from the implementation of the invention is an automatic uniform distribution of the load between the pumping units operating in parallel when supplying gas condensate to the MPC.

This problem is solved, and the technical result is achieved due to the fact that the method of automatic control of the technological process of supplying gas condensate to the MCP provides for an automated process control system that controls the operation of pumping units operating in parallel. Each of the pumping units is connected by branch pipes to the suction pipeline, and their pressure pipelines enter the MCP, which is equipped with a gas condensate flow sensor installed behind the collector. The EM of each pumping unit is connected to an individual frequency converter and is equipped with a current sensor in its power supply line, which ensures control of the electric current in it to control the performance of the pumping unit by changing the frequency of the three-phase supply voltage supplied to the EM from its frequency converter. The task for changing the ED speed is given by an individual PID controller.

The automated process control system, having received the task for the productivity of the integrated gas treatment unit - the CGTP, divides all the ready-to-operate pumping units of n into three groups. The first group includes one pumping unit - the main one. The second group includes k pumping units, which together with the main pumping unit will ensure the fulfillment of the plan for supplying gas condensate to the MCP. The APCS defines this group as working. The third group, numbering (n-k-1), the APCS unit refers to the reserve group, and will use them if necessary.

This division into groups of the APCS is carried out using two switching units connected to the PID controller of each pumping unit. The first switching unit commutes one of the two types of reference signal, and sends the required reference signal to the SP reference input of its PID controller, depending on the group to which the pump unit is included. The second switching unit commutes one of the two types of feedback signal, and feeds the selected signal to the PV feedback input of its PID controller, depending on the group to which the pumping unit is included.

Upon the command to start the system, the APCS turns on the main pumping unit, setting the signal of the plan for pumping gas condensate into the MPC at the SP input of its PID regulator using its first switching unit, which is set by the dispatcher of the gas production company. At the same time, using the second switching unit, the APCS sends a signal from the gas condensate flow sensor in the MCP to the PV feedback input of the PID controller of the main pumping unit. After the main pump unit reaches the operating mode, the APCS sequentially starts up the pump units from the operating group. To do this, using the first switching unit, it sends a signal equal to the value of the average current I _cf in the power supply lines of the main pumping unit and pumping units from the group connected in parallel with it to the input of the SP setting of their PID controllers, which is operating together with the pumping unit newly connected to them. ... In this case, the value of the average current I _{cf of the} APCS is calculated by the formula:

where I _main. - value of the current in the electric motor power line of the main pumping unit; I _{slave_k} is the value of the current in the power supply line of the ED of the i-th pump unit that is switched on and switched on from the group in operation.

And to the feedback input PV of these PID controllers of the APCS, using their second switching units, it sends a signal from the current sensors installed in the power line of the pumping units controlled by them. At the same time, the APCS monitors all measured parameters and recalculates the values of the calculated parameters at a given frequency, which guarantees the continuity of the technological process control.

In the event of an increase in the planned target for condensate production or when the current value in the power supply line of at least one of the operating pumping units reaches its maximum allowable value determined by its passport, the APCS consecutively transfers the required number of pumping units from the reserve group to the operating group. For this, the APCS, using the first switching unit of the pumping unit being started, sets to the input of the SP setting of its PID controller a signal equal to the average current I _cf calculated by the formula (1) taking into account the current value of the current in the EM supply line of each newly started pumping unit ...

In the event of a decrease in the planned target for condensate production or when the current value in the power supply circuit of at least one of the operating pumping units reaches its minimum permissible value determined by its passport, the APCS consecutively transfers the required number of pumping units from the operating group to the reserve group. For this, the APCS, using the first switching unit of the pumping unit to be stopped, sets the signal equal to zero to the input of the SP setting of its PID controller, and recalculates the mean current I _av , calculated by formula (1), taking into account the newly switched off pump unit.

At the same time, at least two pumping units always operate in the system, one in the main mode, and the second in the operating mode. In the event of a failure of a pumping unit operating in the main mode, the APCS from the group operating immediately transfers one pumping unit to the main mode, using the switching units of its PID controller. And, accordingly, one pumping unit from the group is transferred from the reserve APCS to the operating group. Also, if a pumping unit from the operating group fails, the APCS immediately transfers one pumping unit from the reserve group to the operating group.

In the case when all pumping units are involved in operation and at least one of them in the power line has reached its maximum permissible current value, the APCS generates a message to the operator about the need to make appropriate control decisions to prevent emergency situations in the system operation.

The proposed invention is illustrated by the drawing, which shows a block diagram of automatic control of pumping units operating in parallel, supplying gas condensate to the MCP. The diagram uses the following designations:

1 - buffer tank;

2 _i - inlet fine filter of the i-th pumping unit (i is the number of the pumping unit, i = 1, 2, ..., n, where n is the number of pumping units at the installation);

3 _i - i-th pump unit;

4 _i - power supply line of the electric motor (EM) of the i-th pump unit 3 _i ;

5 - flow sensor of gas condensate in the MCP;

6 - MCP;

7 _i - current sensor of the i-th pump unit;

8 _i - frequency converter (FC) of the i-th pump unit;

9 - power supply line of frequency converters;

10 - setpoint signal - gas condensate flow rate in the MCP;

11 _i - signal of assignment to the i-th pump unit in the groups "standby" and "working";

12 _i - signal for switching the operating mode of the switching units 13 _i and 14 _i ;

13 _i - block for switching the signal of the PID controller 15 _i (first switching block);

14 _i - PID controller feedback signal commutation unit 15 _i (second commutation unit);

15 _i - PID controller of the i-th pump unit.

Blocks 13 _i , 14 _i , and PID controller 15 _{i are} implemented on the basis of an automated process control system.

Automatic control of the gas condensate supply to the MKP 6 is carried out based on the readings:

- flow sensor 5, installed at the outlet of the UKPG (i.e. at the beginning of the MPC, behind the points of connection of the outputs of the pumping units to it);

- current sensors 7 ₁ ,…, 7 _n , installed on power lines 4 ₁ ,…, 4 _n EM of pumping units 3 ₁ ,…, 3 _n .

The load on each pumping unit is characterized by the current value in the power supply line of its EM.

All measurements of the listed parameters of the APCS are made at a specified frequency, sufficient to ensure the continuity of technological processes in automatic mode. In parallel, the APCS refines and forms the values of the output parameters used by the system to control technological processes with the same frequency.

Automatic maintenance of the set capacity of the GPP is carried out by a group of pumping units connected in parallel with an even distribution of the load between the ED of these pumping units. Changing the load is allowed within the limits of their passport data and is determined by the value of the current in the EM supply line.

The method for automatic control of the technological process of supplying gas condensate to the MCP is implemented as follows.

When starting the APCS, it assigns the following operating modes of pumping units:

- "main";

- "working";

- "reserve".

One pumping unit is assigned to operate in the “main” mode. The signal of the plan for pumping gas condensate into the gas condensate, which is set by the dispatcher of the gas production company, is sent to the input of the SP task of its PID controller.

For operation in the "operating" mode, k pumping units are assigned, ensuring the execution, together with the pumping unit operating in the "main" mode, of the plan for pumping gas condensate into the MPC, but not less than one. To the input of the SP setting of these PID controllers, the APCS sends a signal equal to the average current in the power line of the pumping units operating in the "main" and "operating" modes, which, with a given frequency, is determined by the formula:

where I _main. - the value of the current in the electric motor power supply line of the pumping unit operating in the "main"mode; I _{slave_k} is the value of the current in the electric motor power supply line of the i-th pump unit from the “operating” group.

The rest of the pumping units are in the "standby" group. At the SP reference input of these PID controllers, the ACS sets the signal to zero.

To transfer the pumping unit from the “standby” group to the “operating” mode, the APCS sends an average current signal I _{cf to the} SP input of its PID controller, the value of which is determined by formula (1). After the unit reaches the operating mode, the APCS recalculates the value of the average current I _cf taking into account the newly connected unit.

To transfer the pumping unit from the “operating” group to the “standby” mode, the APCS sends a “zero” signal to the SP reference input of this PID controller.

The system is built in such a way that at least two pumping units must always work in it - one in the "main" mode, the second in the "working" mode. In case of failure of a pumping unit operating in the “main” mode, the APCS from the “operating” group immediately switches one pumping unit to the “main” mode. Accordingly, one pumping unit from the "standby" group is transferred to the "operating" group. In case of failure of a pumping unit from the “operating” group, the APCS immediately transfers one pumping unit from the “reserve” group to the “operating” group.

The implementation of such an algorithm for the functioning of the system in the event of pumping unit failures guarantees the continuous pumping of gas condensate into the MCP, which significantly increases the reliability of the system.

The total number of pumping units at the GPP in all groups is determined by the requirements for its productivity and the reliability of gas condensate supply to the MPC.

The number of pumping units in the “operating” and “standby” groups is determined by the APCS at system startup and realizes their distribution into groups using switching units 13 _i and 14 _i .

To turn on the selected pumping unit 3 ₁ into the "main" ACS TP mode sets the high-level signal 12, i.e. " _One " at the input In3 of its block 13 ₁ , and at the input In1 of its block 14 ₁ . The APCS keeps the rest of the pumping units in the “operating” and “standby” groups by setting the low level signal 12, i.e. "Zero" at the input In3 of their blocks 13, and at the input In1 of their blocks 14.

Switching unit 13 operates using the following algorithm. When the APCS at its input In3 sets the signal 12, high level, i.e. "One", then it commutes the signal 10 of the setpoint of the planned target for the gas condensate flow rate in the MCP, entering its input In1, to its output Q, and then this signal is fed to the input of the reference SP of its PID controller 15 _i .

When the APCS at the input In3 of the switching unit 13 _i sets the signal 12 _i low, i.e. “Zero”, then it commutes - the reference signal to the i-th pumping unit from the “standby” or “operating” group, arriving at its input In2, at its output Q, and then it is fed to the input of the reference SP of the PID controller 15 _i .

Switching unit 14 _i operates using the following algorithm. When its input In1 is set to a high level signal 12 _i , i.e. "One", then it commutes the signal of the actual flow rate of gas condensate in the MCP, coming to its input In3 from the sensor 5, to its output Q from which it is fed to the feedback input PV of the PID controller 15 _i .

When the input In1 of the switching unit 14 _{i is} set to a low level signal 12 _i , i.e. "Zero", then it commutes the signal of the current value from the sensor 7 _i , arriving at its input In2 to its output Q, from which it is fed to the feedback input of the PV PID controller 15 _i .

The principle of switching units 13 _i and 14 _i allows the APCS when starting the system to select any of the available pumping units for operation in the “main” mode and in the “operating” and “standby” groups, and promptly transfer any unit from the “operating” group to the mode “Main”, as well as from the “working” group to the “reserve” group and vice versa.

This significantly increases the reliability of gas condensate supply to the MPC and ensures strict adherence to the planned targets for its supply to consumers, even in the event of failures during pumping of gas condensate to the MPC.

For simplicity of presentation of the essence of the application, let us consider the situation when, when starting the system for operation in the "main" mode, the APCS has chosen the pumping unit 3 ₁ (see Fig.). To increase the reliability of the gas condensate supply to the MPC, the APCS from the "reserve" group chose pumping unit 3 ₂ (see Fig.) As the second pumping unit, and these two units together provide a plan for pumping gas condensate into the MPC.

When the system starts up, the APCS sets the high-level signal 12 ₁ - "one" at the input In3 of block 13 ₁ and at the input In1 of block 14 _{1 of the} pump unit assigned to operate in the "main" mode. Accordingly, the signal 10 for setting the condensate flow rate setpoint in the MCP Q _{set_mpk} - the planned level of gas condensate supply to the MPC from the In1 input of block 13 ₁ will be switched to its output Q, and then it is fed to the SP setpoint input of the PID controller 15 ₁ . At the same time, the signal from the flow sensor 5 installed at the entrance to the IPC, i.e. the signal of the actual value of the condensate flow rate Q _{mpk_f} will be fed to the input In3 of unit 14 ₁ , which will be switched to its output Q and then it will be fed to the PV feedback input of the PID controller 15 ₁ . As a result, a control signal will be formed at the output of the CV PID controller 15 ₁ , which will be fed to the input of the PE 8 ₁ , which controls the speed of the electric motor of the pump unit 3 ₁ , selected for operation in the "main" mode.

At the same time, pumping units 3 ₂ , ..., 3 _{n are} turned off, i.e. are in the "reserve" group. This is ensured by the fact that when the system is started at the inputs In2 and In3 of their blocks 13 ₂ , ..., 13 _n , the APCS will set signals 11 ₂ , ..., 11 _n and 12 ₂ , ..., 12 _n corresponding to a low level, i.e. "zero". Due to this, blocks 13 ₂ , ..., 13 _n will commute the value of "zero" signals 11 ₂ , ..., 11 _n to their output Q and then these signals will be sent to the input of the SP of the PID controllers 15 ₂ , ..., 15 _n . As a result, these PID controllers at their outputs CV will generate a zero signal, which excludes the inclusion in the work 8 PE _2, ..., 8 _n pump units 3 _2, ..., 3 _n.

After starting the pump unit 3 ₁ in the "main" mode of the APCS, it records the current value in the power supply line 4 _{1 of} its ED using the sensor 7 ₁ . To start the second pump unit 3 _{2, the} APCS calculates I _av for these two units according to formula (1), since at the initial moment the pump unit 3 ₂ stands, then I _av = I _main. / 2 and sends it as a command signal 11 ₂ to turn on the second pumping unit in the "running" mode and a signal for the developed power. This signal of the APCS supplies the input In2 of block 13 _{2 of} commutation of the reference signal to the PID regulator 15 ₂ . Since at the input In3 of block 13 _{2 of the} ACS TP set the signal 12 ₂ - "zero", then block 13 ₂ commutes the value of signal 11 ₂ from its input In2 to its output Q, and then this signal goes to the SP input of the PID controller 15 ₂ . Signal 12 ₂ - "zero" is simultaneously fed to the input In1 of unit 14 ₂ , due to which this unit commutes the signal of the actual current value in the line 4 _{2 of the} EM power supply of the pumping unit 3 ₂ , coming from the current sensor 7 ₂ to the PV input of the PID feedback -regulator 15 ₂ . As a result, a control signal is formed at the output of the CV of the PID controller 15 ₂ , which is fed to the input of the PE 8 ₂ , which controls the speed of the electric motor of the pump unit 3 ₂ . As a result, the pumping unit 3 _{2 is} put into operation and begins to supply condensate to the MKP 6, i.e. causes an increase in condensate consumption in the MCP. An increase in the condensate flow rate in the MCP is recorded by sensor 5, the signal from which immediately goes to the input In3 of unit 14 ₁ , is switched to its output Q and then goes to the feedback input of the PV PID controller 15 ₁ , causing a corresponding decrease in its performance, and hence consumed electric motor current of the pumping unit 3 ₁ .

The APCS at a given frequency determines the value of the current I _cf according to the formula (1) in the power lines of the electric motors of the pumping units 3 ₁ and 3 ₂ and sets the signal of its value 11 ₂ at the input In2 of the block 13 ₂ , which commutes it to its output Q, and it enters to the SP reference input of the PID controller 15 ₂ . Thanks to this relationship in the operation of pumping units 3 ₁ and 3 ₂ , an even distribution of the load given by the plan between them is ensured.

If subsequently the current value of one of the EM of pumping units 3 ₁ and 3 ₂ reaches its maximum value I _max , determined by their passport, then the APCS immediately activates the next pump unit from those in the "reserve" group, using the algorithm described above, etc. ...

In the case of a decrease in the task for supplying gas condensate to the IPC, the value of the current I _cf , determined by the formula (1), will accordingly decrease. And if the APCS reveals that a smaller number of pumping units can cope with the task of supplying gas condensate to the MPC, then it transfers one pumping unit from the “operating” group to the “reserve” group, for example, under number j (index j indicates the number of the selected pumping unit from the "running" group). It is turned off by setting the signal 11 _j "zero" at the input In2 of block 13 _{j of the} selected APCS of the j-th pump unit. Since the inputs In3 blocks 13 of pump units that are in groups "working" and "standby" at system startup scripting signal 12 is "zero", then block 13 _j signal "zero" from input 11 _j will switch on its output Q and further to the input of the reference SP of the PID controller 15 _j . As a result, the PID controller 15 _{j will} transfer the pump unit 3 _j from the “operating” group to the “standby” group.

If all pumping units are involved, and the value of the current in their power supply line approaches the maximum allowable value, then the APCS generates a message to the operator that the pumping units have reached the maximum possible performance and the need to make appropriate control decisions.

The coefficients for PID controllers are set at the time of their tuning by the service personnel to work in specific conditions according to the method set forth, for example, in the "Encyclopedia of ACS TP", p. 5.5, the classic PID controller [Internet resource http://www.bookasutp.ru /Chapter5_5.aspx#HandTuning].

The method of automatic control of the technological process of gas condensate supply to the gas condensate is implemented in PJSC Gazprom, LLC Gazprom dobycha Yamburg at the Zapolyarnoye gas condensate field at the GPP 1V, UKPG 2V. Operational results have shown its high efficiency. The claimed invention can be widely used in other operating and newly developed gas condensate fields in the Russian Federation.

The use of this method makes it possible to automatically evenly distribute the load between pumping units operating in parallel and to eliminate their overload when supplying gas condensate to the MPC, which increases the reliability of the gas condensate supply to the MPC and increases the service life of the pumping units.

Claims (7)

1. A method of automatic control of the technological process of supplying gas condensate to the main condensate pipeline - MCP, including an automated process control system - APCS, which controls the operation of parallel pumping units, each of which is connected by branch pipes to the suction pipeline, and their pressure pipelines enter the MCP manifold , which is equipped with a gas condensate flow sensor, and the electric motor - EM of each pumping unit is connected to an individual frequency converter and is equipped with a current sensor in its power supply line, which ensures control of the electric current in it to control the performance of the pumping unit by changing the frequency of the three-phase supply voltage supplied to the EM from its frequency converter, and the task for changing the frequency of which is issued by an individual proportional-integral-differentiating PID controller, characterized in that the APCS, having received a task for production It divides all ready-to-operate pumping units of n into three groups, one pumping unit is the main one, k pumping units, which together with the main pumping unit will ensure the fulfillment of the plan for supplying gas condensate to the MCP, defines as a group working, and (nk-1) the unit leaves reserve in the group, which will be used if necessary, and this division into groups of the APCS is performed using two switching units connected to the PID controller of each pumping unit, the first switching unit switches one of two types of the reference signal and sends the required reference signal to the SP reference input of its PID controller, depending on the group in which the pumping unit is included, and the second switching unit switches one of the two types of feedback signal and sends the selected signal to the PV feedback input of its PID- regulator, depending on the group in which its pumping unit is included, after which the APCS turns on the main pumping unit by setting the plan signal for pumping gas condensate into the MCP to the SP reference input of its PID controller using its first switching unit, which is set by the dispatcher of the gas producing company, and to the PV feedback input of its PID controller APCS using the second the switching unit, sends a signal from the gas condensate flow sensor to the MCP, and after the main pumping unit enters the operating mode of the APCS, it sequentially launches the pumping units from the operating group, supplying a signal through their first switching units to the SP setting input of their PID controllers, equal to the value of the average current I _av in the power lines of the main pumping unit and pumping units from the group connected in parallel with it, operating together with the pump unit newly connected to them, while the value of the average current I _{av is} calculated by the APCS by the formula

where I _main. - value of the current in the electric motor power line of the main pumping unit; I _{slave_k} is the value of the current in the power supply line of the ED of the i-th pump unit that is switched on and switched on from the operating group, and to the feedback input PV of these PID controllers of the APCS, using their second switching unit, it sends a signal from the current sensors installed in the power supply lines of the pumping units controlled by them, while the APCS monitors all measured parameters and recalculates the values of the calculated parameters at a specified frequency, which guarantees the continuity of the technological process control. 2. The method according to claim 1, characterized in that when the planned target for the production of condensate increases or when the current value in the power line of at least one of the operating pumping units reaches its maximum permissible value determined by its passport, the APCS transfers the required number of pumping units from the reserve group to the operating group by setting through the first switch block of the pumping unit being started to the input of the SP setting of its PID controller a signal equal to the average current I _av , calculated by the formula (1) taking into account the current value of the current in the EM supply line of the newly started pumping unit unit. 3. The method according to claim 1, characterized in that in the event of a decrease in the planned target for the production of condensate or when the current value in the power supply line of at least one of the operating pumping units reaches its minimum permissible value, determined by its passport, the APCS transfers the required amount pumping units from the group working in the reserve group, using the first switching unit of the reference signal to set the signal equal to zero to the input SP of the PID controller of the pumping unit to be stopped, and recalculates the value of the average current I _av , calculated by formula (1), excluding accounting for the pump unit to be switched off. 4. The method according to claim 1, characterized in that at least two pumping units always operate in the system, one in the main mode, and the second in the operating mode, and in the event of a failure of the pumping unit operating in the main mode, the APCS from the group working immediately it transfers one pumping unit to the main mode, using the switching units of its PID controller, and, accordingly, one pumping unit from the reserve group is transferred to the operating group, and if a pumping unit from the group fails, the operating unit immediately transfers one pumping unit from the reserve group to the group working. 5. The method according to claim 1, characterized in that the APCS in the case when all pumping units are involved in the operation and at least one of them in the power line has reached its maximum allowable value, generates a message to the operator about the need to accept the appropriate controllers solutions to prevent emergency situations in the system.

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