Method and system for controlling a multi-stage compressor train
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENYANG TURBO MASCH CORP
- Filing Date
- 2025-06-04
- Publication Date
- 2026-07-24
Smart Images
Figure CN120487554B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of compressor control technology, and in particular to a control method and system for a multi-stage compressor unit. Background Technology
[0002] An air compressor is a device that converts low-pressure gas into high-pressure gas through compression, thereby converting the mechanical energy of a prime mover (usually an electric motor) into gas pressure energy. Primarily used to provide aerodynamic power, it is a fundamental power product for industrial modernization and automation, and an indispensable piece of equipment in industrial activities. It is widely used in equipment manufacturing, automotive, metallurgy, power, electronics, medical, and textile industries.
[0003] Currently, the overall control of existing compressors remains semi-automatic. Single-stage or individual compressors use programmable logic controllers (PLCs) to perform simple industrial control adjustments and automatic logic outputs. However, for multi-stage compressor units connected in series, during the speed-up process, to achieve the control target, manual control of the drive motor speed and the opening and closing degree of the anti-surge valve is required. This necessitates repeated judgments and adjustments based on the operator's experience, demanding a high level of expertise from the operator. Incorrect judgments can lead to compressor interlock shutdowns, requiring restarts. Consequently, the control efficiency of multi-stage compressor units is low, and labor costs are high. Summary of the Invention
[0004] In view of this, the present invention provides a control method and system for a multi-stage compressor unit, the main purpose of which is to solve the problem of low start-up efficiency of existing compressor units.
[0005] According to one aspect of the present invention, a control method for a multi-stage compressor unit is provided, comprising:
[0006] In response to the compressor unit start command, the operation monitoring data of the target compressor unit and the associated control parameters and associated control quantity gain of the associated compressor unit are acquired at preset time intervals. The associated compressor unit is a compressor unit in the compressor unit that is connected in series with the target compressor unit.
[0007] The initial control parameters of the target compressor unit are calculated based on the operation monitoring data and preset operation control conditions;
[0008] The target mutual interference influence coefficient is calculated based on the associated control parameters and the associated control quantity gain, and the initial control parameters are corrected using the target mutual interference influence coefficient to obtain the target control parameters, which include the drive motor control parameters and the anti-surge valve control parameters.
[0009] When the target control parameters meet the control parameter threshold, a control signal is generated based on the target control parameters and sent to the drive motor and anti-surge valve of the target compressor unit until the global anti-surge valve in the compressor unit is closed, so as to perform operation start-up control on the target compressor unit.
[0010] Furthermore, the initial control parameters include initial control parameters for the drive motor and initial control parameters for the anti-surge valve; the preset operating control conditions include a pressure control safety threshold and a surge control line; and the initial control parameters of the target compressor unit calculated based on the operating monitoring data and the preset operating control conditions include:
[0011] The first offset distance is calculated based on the outlet pressure value in the operation monitoring data and the pressure control safety threshold, and the first offset distance is calculated proportionally and integrally to obtain the initial control parameters of the drive motor.
[0012] The operating point is obtained by fitting the operation monitoring data, and the initial control parameters of the anti-surge valve are obtained by proportional integral and step response calculation of the second offset distance between the operating point and the surge control line.
[0013] Furthermore, before calculating the initial control parameters of the target compressor unit based on the operation monitoring data and preset operation control conditions, the method further includes:
[0014] Obtain the equipment performance parameters of the compressor unit;
[0015] Based on the equipment performance parameters, a compressor unit model is constructed in the simulation software, and the compressor unit operation simulation is performed to obtain pressure value distribution characteristic data and operating point distribution characteristic data;
[0016] A pressure control safety threshold is configured based on the pressure value distribution characteristic data, and a surge control line is configured based on the operating point distribution characteristic data and the surge critical line. The horizontal and vertical coordinate values of any point on the surge control line are less than the horizontal and vertical coordinate values of any point on the surge critical line. The surge critical line is the boundary line between the surge operating point and the non-surge operating point.
[0017] Further, the associated control parameters include associated anti-surge valve control parameters and associated pressure proportional-integral parameters; the associated anti-surge valve control parameters include associated step response parameters and associated proportional-integral parameters; the target mutual disturbance influence coefficient includes anti-surge valve opening influence coefficient and drive motor speed influence coefficient; the anti-surge valve opening influence coefficient includes step mutual disturbance influence coefficient and proportional mutual disturbance influence coefficient; the associated control quantity gain includes drive motor control quantity gain and anti-surge valve control quantity gain; and the calculation of the target mutual disturbance influence coefficient based on the associated control parameters and the associated control quantity gain includes:
[0018] For each associated compressor unit, the product of the associated pressure proportional-integral parameter and the drive motor control quantity gain is calculated to obtain a first influence coefficient. The global first influence coefficients are then summed to obtain the drive motor speed influence coefficient.
[0019] For each of the associated compressor units, a second influence coefficient is calculated based on the associated step response parameters and the gain of the anti-surge valve control quantity, and a third influence coefficient is calculated based on the associated proportional-integral parameters and the gain of the anti-surge valve control quantity.
[0020] The global second influence coefficient is summed to obtain the step mutual interference influence coefficient, and the global third influence coefficient is summed to obtain the proportional mutual interference influence coefficient.
[0021] Furthermore, the initial control parameters of the anti-surge valve include step response parameters and proportional-integral parameters. The step of correcting the initial control parameters using the target mutual interference coefficient to obtain the target control parameters includes:
[0022] The drive motor control parameters are obtained by summing the influence coefficient of the drive motor speed and the initial control parameters of the drive motor.
[0023] The step response control parameters are obtained by summing the step mutual interference influence coefficient and the step response parameters, and the proportional mutual interference influence and the proportional-integral parameters are obtained by summing the proportional-integral control parameters.
[0024] The anti-surge valve control parameters are obtained based on the step response control parameters and the proportional-integral control parameters.
[0025] Furthermore, after sending the control signal to the drive motor and anti-surge valve of the target compressor unit, the method further includes:
[0026] The actual control values of the drive motor and the anti-surge valve are obtained from the drive motor and the anti-surge valve, respectively.
[0027] The gain of the drive motor control quantity is calculated based on the drive motor control parameters and the actual control quantity of the drive motor.
[0028] The gain of the anti-surge valve control quantity is calculated based on the control parameters of the anti-surge valve and the actual control quantity of the anti-surge valve.
[0029] The control gain of the drive motor and the control gain of the anti-surge valve are sent to the associated compressor control unit to adjust the control parameters of the associated compressor control unit.
[0030] According to another aspect of the present invention, a control system for a multi-stage compressor unit is provided, comprising: a controller corresponding to each compressor unit, a data acquisition sensor, a drive motor corresponding to the same compressor unit as the controller, and an anti-surge valve;
[0031] The controller of any of the compressor units is configured to, in response to a compressor unit start-up command, acquire operational monitoring data from the data acquisition sensor at preset time intervals, and acquire associated control parameters from the controller of the associated compressor unit, wherein the associated compressor unit is a compressor unit in the compressor unit that is connected in series with the target compressor unit; calculate the initial control parameters of the target compressor unit based on the operational monitoring data and preset operational control conditions; calculate the target mutual interference influence coefficient based on the associated control parameters and the associated control quantity gain, and use the target mutual interference influence coefficient to correct the initial control parameters to obtain target control parameters, wherein the target control parameters include drive motor control parameters and anti-surge valve control parameters; when the target control parameters meet the control parameter threshold, generate a control signal based on the target control parameters, and send the control signal to the drive motor and anti-surge valve of the target compressor unit until the global anti-surge valve in the compressor unit is closed, so as to perform operational start-up control on the target compressor unit;
[0032] Any of the aforementioned drive units is configured to receive a first control signal corresponding to the drive unit control parameters, and adjust the rotational speed according to the control signal;
[0033] Any of the aforementioned anti-surge valves is configured to receive a second control signal corresponding to the control parameters of the anti-surge valve, and adjust the opening degree according to the control signal.
[0034] The data acquisition sensor is used to collect operational monitoring data of the corresponding compressor unit.
[0035] Furthermore, the controller includes a drive motor control module and an anti-surge valve control module;
[0036] The drive motor control module is used to calculate a first offset distance based on the outlet pressure value in the operation monitoring data and the pressure control safety threshold, and to perform proportional-integral calculation on the first offset distance to obtain the initial control parameters of the drive motor.
[0037] The anti-surge valve control module is used to fit the operating monitoring data to obtain the operating point, and to perform proportional integral and step response calculations on the second offset distance between the operating point and the surge control line to obtain the initial control parameters of the anti-surge valve.
[0038] Furthermore, the system also includes:
[0039] The first acquisition module is used to acquire the equipment performance parameters of the compressor unit;
[0040] The simulation module is used to construct a compressor unit model in the simulation software based on the equipment performance parameters, and to perform compressor unit operation simulation to obtain pressure value distribution characteristic data and operating point distribution characteristic data.
[0041] The configuration module is used to configure a pressure control safety threshold based on the pressure value distribution characteristic data, and to configure a surge control line based on the operating point distribution characteristic data and the surge critical line. The horizontal and vertical coordinate values of any point on the surge control line are less than the horizontal and vertical coordinate values of any point on the surge critical line. The surge critical line is the boundary line between the surge operating point and the non-surge operating point.
[0042] Furthermore, the controller also includes:
[0043] The first decoupling module is used to calculate the product of the associated pressure proportional-integral parameter and the drive motor control quantity gain for each associated compressor unit to obtain a first influence coefficient, and to sum the global first influence coefficients to obtain the drive motor speed influence coefficient.
[0044] The second decoupling module is used to calculate a second influence coefficient for each associated compressor unit based on the associated step response parameter and the anti-surge valve control gain, and to calculate a third influence coefficient based on the associated proportional-integral parameter and the anti-surge valve control gain; to sum the global second influence coefficients to obtain the step mutual interference influence coefficient, and to sum the global third influence coefficients to obtain the proportional mutual interference influence coefficient.
[0045] Furthermore, the controller also includes:
[0046] The first correction module is used to sum and calculate the influence coefficient of the drive motor speed and the initial control parameters of the drive motor to obtain the drive motor control parameters;
[0047] The second correction module is used to sum and calculate the step mutual disturbance influence coefficient and the step response parameter to obtain the step response control parameter, and to sum and calculate the proportional mutual disturbance influence and the proportional-integral parameter to obtain the proportional-integral control parameter; and to obtain the anti-surge valve control parameter based on the step response control parameter and the proportional-integral control parameter.
[0048] Furthermore, the system also includes:
[0049] The second acquisition module is used to acquire the actual control quantity of the drive motor and the actual control quantity of the anti-surge valve from the drive motor and the anti-surge valve, respectively.
[0050] The first calculation module is used to calculate the drive motor control quantity gain based on the drive motor control parameters and the actual control quantity of the drive motor.
[0051] The second calculation module is used to calculate the control gain of the anti-surge valve based on the control parameters of the anti-surge valve and the actual control quantity of the anti-surge valve.
[0052] The transmitting module is used to transmit the control gain of the drive motor and the control gain of the anti-surge valve to the associated compressor control unit in order to adjust the control parameters of the associated compressor control unit.
[0053] According to another aspect of the present invention, a storage medium is provided, wherein at least one executable instruction is stored therein, the executable instruction causing a processor to perform an operation corresponding to the control method of the multi-stage compressor unit described above.
[0054] According to another aspect of the present invention, a terminal is provided, comprising: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus;
[0055] The memory is used to store at least one executable instruction, which causes the processor to perform the operation corresponding to the control method of the multi-stage compressor group described above.
[0056] By employing the above-described technical solutions, the technical solutions provided by the embodiments of the present invention have at least the following advantages:
[0057] This invention provides a control method and system for a multi-stage compressor unit. In response to a compressor unit start-up command, the method acquires operational monitoring data of the target compressor unit and associated control parameters of related compressor units at preset time intervals. Based on the operational monitoring data and preset operational control conditions, initial control parameters of the target compressor unit are calculated. A target mutual interference coefficient is calculated based on the associated control parameters and the gain of the associated control quantity. The initial control parameters are then corrected using the target mutual interference coefficient to obtain the target control parameters. A control signal is generated based on the target control parameters and sent to the target controlled object until the global anti-surge valve in the compressor unit closes. This significantly reduces the control adjustment time during the start-up process of the multi-stage compressor, lowers the incidence of surge and shutdown, and ensures control accuracy, thereby greatly improving the efficiency of compressor unit start-up.
[0058] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description
[0059] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0060] Figure 1 A flowchart of a control method for a multi-stage compressor unit provided by an embodiment of the present invention is shown;
[0061] Figure 2 A schematic diagram of a compressor unit structure provided by an embodiment of the present invention is shown;
[0062] Figure 3 A flowchart of another control method for a multi-stage compressor unit provided by an embodiment of the present invention is shown;
[0063] Figure 4 This diagram illustrates the offset distance between a surge control line and the operating point according to an embodiment of the present invention.
[0064] Figure 5 A schematic diagram of the generation process of control parameters for an anti-surge valve provided by an embodiment of the present invention is shown;
[0065] Figure 6 This diagram illustrates a control system block diagram of a multi-stage compressor unit according to an embodiment of the present invention.
[0066] Figure 7 A schematic diagram of the structure of a terminal provided in an embodiment of the present invention is shown. Detailed Implementation
[0067] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0068] To address the problem of low start-up efficiency in existing compressor units, this invention provides a control method for multi-stage compressor units, such as... Figure 1 As shown, the method includes:
[0069] 101. In response to the compressor unit start command, acquire the operation monitoring data of the target compressor unit and the associated control parameters and associated control quantity gain of the associated compressor unit at preset time intervals.
[0070] In this embodiment of the invention, the multi-stage compressor unit is a compressor unit configured with multiple stages connected in series. Each compressor unit can be an independent control segment within the compressor unit, a sub-compressor device, or an independent control segment within a sub-compressor device; this embodiment does not impose specific limitations. Each compressor unit is equipped with a drive motor, an anti-surge valve, and a controller for controlling the drive motor speed and the opening degree of the anti-surge valve. When the compressor unit is started, each controller in the compressor unit acquires the corresponding compressor unit's operation monitoring data and the control parameters of other compressor units in the compressor unit at preset time intervals. The compressor unit corresponding to the controller is the target compressor unit, and other compressor units configured in series with the target compressor unit are associated compressor units, i.e., associated compressor units are compressor units in the compressor unit that are connected in series with the target compressor unit. The operation monitoring data is based on data collected by sensors configured at the outlet and inlet of the target compressor unit, and may include inlet and outlet air pressure data, inlet and outlet temperature data, inlet and outlet flow rate data, etc. The preset time interval can be the same as the sensor data acquisition time interval or a multiple of the data acquisition time interval; this embodiment does not impose specific limitations. Associated control parameters are the initial control parameters determined by the controller of the associated control unit based on the collected operation monitoring data, such as proportional-integral parameters and step response parameters.
[0071] It should be noted that in a series-connected compressor unit, the control action of any compressor unit will affect other compressor units to varying degrees, i.e., mutual interference. Therefore, in order to achieve accurate control of the compressor units, it is also necessary to obtain the associated control parameters of all related compressor units with mutual interference relationships during the process of determining the control quantity, so as to comprehensively consider mutual interference factors when determining the control quantity.
[0072] 102. The initial control parameters of the target compressor unit are calculated based on the operation monitoring data and preset operation control conditions.
[0073] In this embodiment of the invention, the startup of the compressor unit is a process in which each compressor unit continuously increases the drive motor speed and reduces the anti-surge valve opening within a safe operating range (without surge or overshoot). For example... Figure 2 As shown, the anti-surge valve is the return flow control valve for compressor units 1, 2, and 3. Only when the return flow control valves of each compressor unit are completely closed can the gas circulation within the current compressor unit end, allowing the compressed gas from each unit to be fully pumped downstream, thus completing the grid connection operation of each compressor unit and the startup of the compressor group. The preset operating control conditions characterize the control conditions for the target compressor unit to operate safely. These conditions may include a pressure control safety threshold for limiting the drive motor control and a surge control line for limiting the anti-surge valve control. The deviation between the operating control state characterized by the operating monitoring data and the preset operating control conditions represents the maximum adjustment amount for the operating control. Adjusting according to this amount achieves the most efficient and safe startup. However, since this deviation does not consider the mutual interference effects of the operating control of other related compressor units on the target compressor unit, this portion to be adjusted is used as the initial control parameters. The initial control parameters include the initial control parameters of the drive motor and the initial control parameters of the anti-surge valve.
[0074] 103. Calculate the target mutual interference influence coefficient based on the associated control parameters and the associated control quantity gain, and use the target mutual interference influence coefficient to correct the initial control parameters to obtain the target control parameters.
[0075] In this embodiment of the invention, the target control parameters include drive motor control parameters and anti-surge valve control parameters. The target mutual interference influence coefficients include the anti-surge valve opening influence coefficient and the drive motor speed influence coefficient. The drive motor control parameters and anti-surge valve control parameters are obtained by correcting the initial control parameters of the drive motor and the initial control parameters of the anti-surge valve based on the anti-surge valve opening influence coefficient and the drive motor speed influence coefficient, respectively. The target compressor unit and other associated compressor units have a mutually influential and mutually restrictive relationship. That is, the actual output control quantity of the associated compressor unit is also processed by the gain correction of the initial control parameters and target control parameters of the target compressor unit. The associated control parameters and associated control quantity gains also carry the influence of the target compressor unit. The associated control parameters and associated control quantity gains of different associated compressor units can reflect the degree of mutual interference influence of different associated compressor units on the target compressor unit. Therefore, by modifying the initial control parameters of the target compressor unit based on the mutual interference coefficient of all associated compressor units, the influence of the control output of other compressor units on the control quantity setting process of each compressor unit can be fully considered, thereby achieving adaptive adjustment of the mutual interference in the compressor unit and avoiding the need for repeated adjustment of control quantity and manual intervention due to compressor unit oscillation, thus improving the start-up efficiency of the compressor unit.
[0076] 104. When the target control parameters meet the control parameter threshold, a control signal is generated based on the target control parameters, and the control signal is sent to the drive motor and anti-surge valve of the target compressor unit until the global anti-surge valve in the compressor unit is closed, so as to perform operation start-up control on the target compressor unit.
[0077] In this embodiment of the invention, the controlled objects are the drive motor and anti-surge valve of the target compressor unit. The control signals are current signals used to adjust the speed of the drive motor and the opening of the anti-surge valve. The control signals are generated based on the control parameters of different controlled objects. For example, a first control signal is generated based on the drive motor control parameters, and a second control signal is generated based on the anti-surge valve control parameters. Since the target control parameters can be positive or negative, a control parameter threshold is used to determine the target control parameters when generating the control signals. For example, if the control parameter threshold is 0, when the target control parameter is positive, a control signal is generated to control the controlled object according to the target control parameter; when the target control parameter is zero or negative, no control signal is generated, or a control signal is generated to instruct the controlled object to maintain the current control state.
[0078] In one embodiment of the present invention, for further illustration and limitation, such as Figure 3As shown, step 102 calculates the initial control parameters of the target compressor unit based on the operation monitoring data and preset operation control conditions, including:
[0079] 201. Calculate the first offset distance based on the outlet pressure value in the operation monitoring data and the pressure control safety threshold, and perform proportional-integral calculation on the first offset distance to obtain the initial control parameters of the drive motor.
[0080] 202. The operating point is obtained by fitting the operation monitoring data, and the proportional integral and step response calculations are performed on the second offset distance between the operating point and the surge control line to obtain the initial control parameters of the anti-surge valve.
[0081] In this embodiment of the invention, the initial control parameters include the initial control parameters of the drive motor and the initial control parameters of the anti-surge valve. The preset operating control conditions include a pressure control safety threshold and a surge control line. The first offset distance is the difference between the outlet pressure value and the pressure control safety threshold. This difference is used as an offset input to the PID controller of the drive motor to obtain the initial control parameters of the drive motor. The calculation of the second offset distance preferably uses the horizontal axis distance, such as... Figure 4 As shown in the figure, the curve Ss=1, i.e., the SLL curve, is the surge control line, and point OP is the operating point. A surge control point with the same ordinate as point OP is determined within the surge control line. The distance between the surge control point and the ordinate of point OP is the second offset distance. This second offset distance is input to the proportional-integral (PI) and step response modules of the anti-surge valve PID controller to obtain the initial PI parameters and initial step response parameters, i.e., the initial control parameters of the anti-surge valve. The surge control line can be the surge critical line, meaning that when the coordinate of the operating point in any direction exceeds the surge critical curve, the target compressor unit experiences surge. Alternatively, the surge control line can be a rightward shift of the surge critical curve, meaning that the ordinate of any point on the surge control line is less than the ordinate of the point with the same ordinate on the surge critical curve. The rightward shift distance can be set according to actual application requirements; this embodiment of the invention does not impose specific limitations. The operating monitoring data is fitted and calculated to obtain a dimensionless operating point characterizing the operating state of the target compressor unit. Specifically, the operating point is set as (q... r 2 h r ), x-coordinate q r 2 The calculation formula is:
[0082]
[0083] Where K is the throttling element constant, Z s R is the compressibility coefficient of the inlet gas. u T is the universal gas constant. sWhere MW is the inlet temperature, ΔP is the molar mass of the gas, and MW is the inlet temperature. o,s For the pressure difference of the throttling element, P s For inlet pressure, (ZRT) s Let h be the gas constant. The ordinate is h. r The calculation formula is:
[0084]
[0085] in, R c Export pressure P d With inlet pressure P s The ratio P d / P s R t For the outlet temperature T d With inlet temperature T s The ratio T d / T s After obtaining the operating point, calculate the distance between the surge control line and the operating point, i.e., the second offset distance, in the same coordinate system.
[0086] In one embodiment of the present invention, for further explanation and limitation, before the step of calculating the initial control parameters of the target compressor unit based on the operation monitoring data and preset operation control conditions, the method further includes:
[0087] Obtain the equipment performance parameters of the compressor unit;
[0088] Based on the equipment performance parameters, a compressor unit model is constructed in the simulation software, and the compressor unit operation simulation is performed to obtain pressure value distribution characteristic data and operating point distribution characteristic data;
[0089] The pressure control safety threshold is configured based on the pressure value distribution characteristic data, and the surge control line is configured based on the operating point distribution characteristic data and the surge critical line.
[0090] In this embodiment of the invention, equipment performance parameters include parameters characterizing equipment performance such as pipeline parameters, compressor performance parameters, and pressure vessel parameters. Based on these performance parameters, a system model of the current compressor unit is built in dynamic simulation software, and the compressor unit's operating data is simulated to obtain simulated operating data for each compressor unit. Then, feature values are extracted from the simulated operating data using statistical algorithms such as mean and standard deviation to obtain pressure value distribution feature data and operating point distribution feature data. Pressure control safety thresholds are configured based on the pressure value distribution feature data. The simulation software used is Dynsim. The operating point distribution feature data is used to configure the coordinate translation distance between the surge control line and the surge critical line. The horizontal and vertical coordinate values of any point on the surge control line are less than the horizontal and vertical coordinate values of any point on the surge critical line. The surge critical line is used to characterize the operating point threshold at which the target compressor unit experiences surge at different drive speeds.
[0091] In one embodiment of the present invention, for further explanation and limitation, the step of calculating the target mutual interference influence coefficient based on the associated control parameters and the associated control quantity gain includes:
[0092] For each associated compressor unit, the product of the associated pressure proportional-integral parameter and the drive motor control quantity gain is calculated to obtain a first influence coefficient. The global first influence coefficients are then summed to obtain the drive motor speed influence coefficient.
[0093] For each of the associated compressor units, a second influence coefficient is calculated based on the associated step response parameters and the gain of the anti-surge valve control quantity, and a third influence coefficient is calculated based on the associated proportional-integral parameters and the gain of the anti-surge valve control quantity.
[0094] The global second influence coefficient is summed to obtain the step mutual interference influence coefficient, and the global third influence coefficient is summed to obtain the proportional mutual interference influence coefficient.
[0095] In this embodiment of the invention, the associated control parameters include associated anti-surge valve control parameters and associated pressure proportional-integral parameters. The associated anti-surge valve control parameters include associated step response parameters and associated proportional-integral parameters. The target mutual disturbance influence coefficient includes the anti-surge valve opening influence coefficient and the drive motor speed influence coefficient. The anti-surge valve opening influence coefficient includes the step mutual disturbance influence coefficient and the proportional mutual disturbance influence coefficient. The corresponding mutual disturbance influence coefficients are calculated based on the associated step response parameters, associated proportional-integral parameters, and associated control quantity gain of each associated compressor unit. The mutual disturbance influence coefficients of all associated compressor units are summed to obtain the target control parameter, and the sum of the mutual disturbance influence coefficients and the initial control parameters is used as the target control parameter. The associated control quantity gain is calculated integrally and can be negative or positive. Adjusting the initial control parameters based on the mutual disturbance influence coefficient calculated from the associated control quantity gain can either increase or decrease the control quantity. Among them, the associated step response parameter and the associated proportional-integral parameter are the uncorrected control parameters of the associated compressor unit, that is, calculated based on the operation monitoring data and surge control line of the associated compressor unit. The specific calculation process is the same as that of the initial control parameters of the target compressor unit, and will not be repeated here. The associated control gain is the control gain of the associated compressor unit, and its calculation method is the same as that of the target control parameter gain, and will not be repeated here.
[0096] In one embodiment of the present invention, for further explanation and limitation, the step of correcting the initial control parameters using the target mutual interference influence coefficient to obtain the target control parameters includes:
[0097] The drive motor control parameters are obtained by summing the influence coefficient of the drive motor speed and the initial control parameters of the drive motor.
[0098] The step response control parameters are obtained by summing the step mutual interference influence coefficient and the step response parameters, and the proportional mutual interference influence and the proportional-integral parameters are obtained by summing the proportional-integral control parameters.
[0099] The anti-surge valve control parameters are obtained based on the step response control parameters and the proportional-integral control parameters.
[0100] In this embodiment of the invention, the initial control parameters of the anti-surge valve include step response parameters and proportional-integral parameters. Taking the initial control parameters and correction process of the anti-surge valve as an example, as follows... Figure 5As shown, the analog input is the operation monitoring data. Anti-surge controllers UIC-1 and UIC-2 correspond to different compressor units. Taking UIC-1 as the target compressor unit, the compressor units corresponding to UIC-2 and other controllers are the associated compressor units. DEV1 is the second offset distance, PI is the proportional-integral parameter, RT is the step response parameter, PI2 is the proportional-integral parameter corresponding to UIC-2, RT2 is the step response parameter corresponding to UIC-2, and M2 is the anti-surge valve control gain corresponding to UIC-2. PIn is the proportional-integral parameter corresponding to UIC-n, RTn is the step response parameter corresponding to UIC-n, and Mn is the anti-surge valve control gain corresponding to UIC-n. The corresponding PI1, RT1, and M1 are the parameters corresponding to UIC-1.
[0101] In one embodiment of the invention, for further explanation and limitation, after the step of sending control signals to the drive motor and anti-surge valve of the target compressor unit, the method further includes:
[0102] The actual control values of the drive motor and the anti-surge valve are obtained from the drive motor and the anti-surge valve, respectively.
[0103] The gain of the drive motor control quantity is calculated based on the drive motor control parameters and the actual control quantity of the drive motor.
[0104] The gain of the anti-surge valve control quantity is calculated based on the control parameters of the anti-surge valve and the actual control quantity of the anti-surge valve.
[0105] The control gain of the drive motor and the control gain of the anti-surge valve are sent to the associated compressor control unit to adjust the control parameters of the associated compressor control unit.
[0106] In this embodiment of the invention, the actual control quantity refers to the control quantity actually executed by the controlled object, such as the actual speed of the drive motor or the actual opening degree of the anti-surge valve. The target control quantity, i.e., the control quantity represented by the control signal, can also be determined based on the target control parameters. The control quantity gain is set as Gain, and the calculation formula is:
[0107] Gain = log(P) out / P in (4);
[0108] Among them, P out P is the target control variable. inThis is the actual control quantity feedback. The calculation method for the associated control quantity gain of the associated compressor unit is the same as that for this control quantity gain. Since the target compressor unit and the associated compressor units are interconnected, after determining the control quantity gain, proportional-integral parameters, and step response parameters of the target compressor unit, these parameters need to be sent as associated control parameters of other associated compressor units to the controller of the associated compressor unit so that the controller can determine the associated mutual interference influence coefficient of the associated compressor units.
[0109] This invention provides a control method for a multi-stage compressor unit. In response to a compressor unit start-up command, the method acquires operational monitoring data of the target compressor unit and associated control parameters of related compressor units at preset time intervals. Based on the operational monitoring data and preset operational control conditions, initial control parameters of the target compressor unit are calculated. A target mutual interference coefficient is calculated based on the associated control parameters and the gain of the associated control quantity. The initial control parameters are then corrected using the target mutual interference coefficient to obtain target control parameters. A control signal is generated based on the target control parameters and sent to the target controlled object until the global anti-surge valve in the compressor unit closes. This significantly reduces the control adjustment time during the start-up process of the multi-stage compressor, lowers the incidence of surge and shutdown, and ensures control accuracy, thereby greatly improving the efficiency of compressor unit start-up.
[0110] Furthermore, as a response to the above Figure 1 The implementation of the method shown in this invention provides a control system for a multi-stage compressor unit, such as... Figure 6 As shown, the system includes:
[0111] The controller 31, data acquisition sensor 32, drive motor 33 and anti-surge valve 34 of each compressor unit correspond to the controller of the compressor unit;
[0112] The controller 31 of any of the compressor units is configured to, in response to a compressor unit start-up command, acquire operation monitoring data from the data acquisition sensor at preset time intervals, and acquire associated control parameters from the controller of the associated compressor unit, wherein the associated compressor unit is a compressor unit in the compressor unit that is connected in series with the target compressor unit; calculate the initial control parameters of the target compressor unit based on the operation monitoring data and preset operation control conditions; calculate the target mutual interference influence coefficient based on the associated control parameters and the associated control quantity gain, and use the target mutual interference influence coefficient to correct the initial control parameters to obtain target control parameters, wherein the target control parameters include drive motor control parameters and anti-surge valve control parameters; when the target control parameters meet the control parameter threshold, generate a control signal based on the target control parameters, and send the control signal to the drive motor and anti-surge valve of the target compressor unit until the global anti-surge valve in the compressor unit is closed, so as to perform operation start-up control on the target compressor unit;
[0113] Any of the drive motors 33 is configured to receive a first control signal corresponding to the drive motor control parameters, and adjust the rotational speed according to the control signal;
[0114] Any of the anti-surge valves 34 is used to receive a second control signal corresponding to the control parameters of the anti-surge valve, and adjust the opening degree according to the control signal;
[0115] The data acquisition sensor 32 is used to collect the operation monitoring data of the corresponding compressor unit.
[0116] Furthermore, the controller includes a drive motor control module and an anti-surge valve control module;
[0117] The drive motor control module is used to calculate a first offset distance based on the outlet pressure value in the operation monitoring data and the pressure control safety threshold, and to perform proportional-integral calculation on the first offset distance to obtain the initial control parameters of the drive motor.
[0118] The anti-surge valve control module is used to fit the operating monitoring data to obtain the operating point, and to perform proportional integral and step response calculations on the second offset distance between the operating point and the surge control line to obtain the initial control parameters of the anti-surge valve.
[0119] Furthermore, the system also includes:
[0120] The first acquisition module is used to acquire the equipment performance parameters of the compressor unit;
[0121] The simulation module is used to construct a compressor unit model in the simulation software based on the equipment performance parameters, and to perform compressor unit operation simulation to obtain pressure value distribution characteristic data and operating point distribution characteristic data.
[0122] The configuration module is used to configure a pressure control safety threshold based on the pressure value distribution characteristic data, and to configure a surge control line based on the operating point distribution characteristic data and the surge critical line. The horizontal and vertical coordinate values of any point on the surge control line are less than the horizontal and vertical coordinate values of any point on the surge critical line. The surge critical line is the boundary line between the surge operating point and the non-surge operating point.
[0123] Furthermore, the controller also includes:
[0124] The first decoupling module is used to calculate the product of the associated pressure proportional-integral parameter and the drive motor control quantity gain for each associated compressor unit to obtain a first influence coefficient, and to sum the global first influence coefficients to obtain the drive motor speed influence coefficient.
[0125] The second decoupling module is used to calculate a second influence coefficient for each associated compressor unit based on the associated step response parameter and the anti-surge valve control gain, and to calculate a third influence coefficient based on the associated proportional-integral parameter and the anti-surge valve control gain; to sum the global second influence coefficients to obtain the step mutual interference influence coefficient, and to sum the global third influence coefficients to obtain the proportional mutual interference influence coefficient.
[0126] Furthermore, the controller also includes:
[0127] The first correction module is used to sum and calculate the influence coefficient of the drive motor speed and the initial control parameters of the drive motor to obtain the drive motor control parameters;
[0128] The second correction module is used to sum and calculate the step mutual disturbance influence coefficient and the step response parameter to obtain the step response control parameter, and to sum and calculate the proportional mutual disturbance influence and the proportional-integral parameter to obtain the proportional-integral control parameter; and to obtain the anti-surge valve control parameter based on the step response control parameter and the proportional-integral control parameter.
[0129] Furthermore, the system also includes:
[0130] The second acquisition module is used to acquire the actual control quantity of the drive motor and the actual control quantity of the anti-surge valve from the drive motor and the anti-surge valve, respectively.
[0131] The first calculation module is used to calculate the drive motor control quantity gain based on the drive motor control parameters and the actual control quantity of the drive motor.
[0132] The second calculation module is used to calculate the control gain of the anti-surge valve based on the control parameters of the anti-surge valve and the actual control quantity of the anti-surge valve.
[0133] The transmitting module is used to transmit the control gain of the drive motor and the control gain of the anti-surge valve to the associated compressor control unit in order to adjust the control parameters of the associated compressor control unit.
[0134] This invention provides a control system for a multi-stage compressor unit. In response to a compressor unit start-up command, the system acquires operational monitoring data of the target compressor unit and associated control parameters of related compressor units at preset time intervals. Based on the operational monitoring data and preset operational control conditions, initial control parameters of the target compressor unit are calculated. A target mutual interference coefficient is calculated based on the associated control parameters and the gain of the associated control quantity. The initial control parameters are then corrected using the target mutual interference coefficient to obtain the target control parameters. A control signal is generated based on the target control parameters and sent to the target controlled object until the global anti-surge valve in the compressor unit closes. This significantly reduces the control adjustment time during the start-up process of the multi-stage compressor, lowers the incidence of surge and shutdown, and ensures control accuracy, thereby greatly improving the efficiency of compressor unit start-up.
[0135] According to one embodiment of the present invention, a storage medium is provided, the storage medium storing at least one executable instruction, the computer-executable instruction being able to execute the control method of the multi-stage compressor unit in any of the above method embodiments.
[0136] Figure 7 The diagram shows a structural schematic of a terminal according to an embodiment of the present invention. The specific implementation of the terminal is not limited by the specific embodiments of the present invention.
[0137] like Figure 7 As shown, the terminal may include: a processor 402, a communications interface 404, a memory 406, and a communications bus 408.
[0138] The processor 402, communication interface 404, and memory 406 communicate with each other via communication bus 408.
[0139] Communication interface 404 is used to communicate with other network elements such as clients or other servers.
[0140] The processor 402 is used to execute program 410, specifically the relevant steps in the above-described control method embodiment for the multi-stage compressor unit.
[0141] Specifically, program 410 may include program code that includes computer operation instructions.
[0142] Processor 402 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The terminal may include one or more processors of the same type, such as one or more CPUs; or it may include processors of different types, such as one or more CPUs and one or more ASICs.
[0143] Memory 406 is used to store program 410. Memory 406 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.
[0144] Specifically, program 410 can be used to cause processor 402 to perform the following operations:
[0145] In response to the compressor unit start command, the operation monitoring data of the target compressor unit and the associated control parameters and associated control quantity gain of the associated compressor unit are acquired at preset time intervals. The associated compressor unit is a compressor unit in the compressor unit that is connected in series with the target compressor unit.
[0146] The initial control parameters of the target compressor unit are calculated based on the operation monitoring data and preset operation control conditions;
[0147] The target mutual interference influence coefficient is calculated based on the associated control parameters and the associated control quantity gain, and the initial control parameters are corrected using the target mutual interference influence coefficient to obtain the target control parameters, which include the drive motor control parameters and the anti-surge valve control parameters.
[0148] When the target control parameters meet the control parameter threshold, a control signal is generated based on the target control parameters and sent to the drive motor and anti-surge valve of the target compressor unit until the global anti-surge valve in the compressor unit is closed, so as to perform operation start-up control on the target compressor unit.
[0149] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.
[0150] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A control method for a multi-stage compressor unit, characterized in that, include: In response to the compressor unit start command, the operation monitoring data of the target compressor unit and the associated control parameters and associated control quantity gain of the associated compressor unit are acquired at preset time intervals. The associated compressor unit is a compressor unit in the compressor unit that is connected in series with the target compressor unit. The initial control parameters of the target compressor unit are calculated based on the operation monitoring data and preset operation control conditions. The initial control parameters include the initial control parameters of the drive motor and the initial control parameters of the anti-surge valve. The preset operation control conditions include the pressure control safety threshold and the surge control line. The target mutual interference influence coefficient is calculated based on the associated control parameters and the associated control quantity gain. The initial control parameters are then corrected using the target mutual interference influence coefficient to obtain the target control parameters. The target control parameters include drive motor control parameters and anti-surge valve control parameters. The associated control parameters include associated anti-surge valve control parameters and associated pressure proportional-integral parameters. The associated anti-surge valve control parameters include associated step response parameters and associated proportional-integral parameters. The target mutual interference influence coefficient includes anti-surge valve opening influence coefficient and drive motor speed influence coefficient. The anti-surge valve opening influence coefficient includes step mutual interference influence coefficient and proportional mutual interference influence coefficient. The associated control quantity gain includes drive motor control quantity gain and anti-surge valve control quantity gain. When the target control parameters meet the control parameter threshold, a control signal is generated based on the target control parameters and sent to the drive motor and anti-surge valve of the target compressor unit until the global anti-surge valve in the compressor unit is closed, so as to perform operation start-up control on the target compressor unit; The step of calculating the target mutual interference influence coefficient based on the associated control parameters and the associated control quantity gain includes: for each associated compressor unit, calculating the product of the associated pressure proportional-integral parameter and the drive motor control quantity gain to obtain a first influence coefficient, and summing the global first influence coefficients to obtain a drive motor speed influence coefficient; for each associated compressor unit, calculating a second influence coefficient based on the associated step response parameter and the anti-surge valve control quantity gain, and calculating a third influence coefficient based on the associated proportional-integral parameter and the anti-surge valve control quantity gain; summing the global second influence coefficients to obtain a step mutual interference influence coefficient, and summing the global third influence coefficients to obtain a proportional mutual interference influence coefficient.
2. The method according to claim 1, characterized in that, The initial control parameters of the target compressor unit calculated based on the operation monitoring data and preset operation control conditions include: The first offset distance is calculated based on the outlet pressure value in the operation monitoring data and the pressure control safety threshold, and the first offset distance is calculated proportionally and integrally to obtain the initial control parameters of the drive motor. The operating point is obtained by fitting the operation monitoring data, and the initial control parameters of the anti-surge valve are obtained by proportional integral and step response calculation of the second offset distance between the operating point and the surge control line.
3. The method according to claim 2, characterized in that, Before calculating the initial control parameters of the target compressor unit based on the operation monitoring data and preset operation control conditions, the method further includes: Obtain the equipment performance parameters of the compressor unit; Based on the equipment performance parameters, a compressor unit model is constructed in the simulation software, and the compressor unit operation simulation is performed to obtain pressure value distribution characteristic data and operating point distribution characteristic data; A pressure control safety threshold is configured based on the pressure value distribution characteristic data, and a surge control line is configured based on the operating point distribution characteristic data and the surge critical line. The horizontal and vertical coordinate values of any point on the surge control line are less than the horizontal and vertical coordinate values of any point on the surge critical line. The surge critical line is the boundary line between the surge operating point and the non-surge operating point.
4. The method according to claim 1, characterized in that, The initial control parameters of the anti-surge valve include step response parameters and proportional-integral parameters. The process of correcting the initial control parameters using the target mutual interference coefficient to obtain the target control parameters includes: The drive motor control parameters are obtained by summing the influence coefficient of the drive motor speed and the initial control parameters of the drive motor. The step response control parameters are obtained by summing the step mutual interference influence coefficient and the step response parameters, and the proportional mutual interference influence and the proportional-integral parameters are obtained by summing the proportional-integral control parameters. The anti-surge valve control parameters are obtained based on the step response control parameters and the proportional-integral control parameters.
5. The method according to any one of claims 1-4, characterized in that, After sending the control signal to the drive motor and anti-surge valve of the target compressor unit, the method further includes: The actual control values of the drive motor and the anti-surge valve are obtained from the drive motor and the anti-surge valve, respectively. The gain of the drive motor control quantity is calculated based on the drive motor control parameters and the actual control quantity of the drive motor. The gain of the anti-surge valve control quantity is calculated based on the control parameters of the anti-surge valve and the actual control quantity of the anti-surge valve. The control gain of the drive motor and the control gain of the anti-surge valve are sent to the associated compressor control unit to adjust the control parameters of the associated compressor control unit.
6. A control system for a multi-stage compressor unit, characterized in that, The system is used to perform the operation corresponding to the control method of the multi-stage compressor unit as described in claim 1. The system includes: a controller corresponding to each compressor unit, a data acquisition sensor, and a drive motor and anti-surge valve corresponding to the same compressor unit as the controller. The controller of any of the compressor units is configured to, in response to a compressor unit start-up command, acquire operational monitoring data of the target compressor unit from the data acquisition sensor at preset time intervals, and acquire associated control parameters and associated control quantity gain from the controller of the associated compressor unit, wherein the associated compressor unit is a compressor unit in the compressor unit that is connected in series with the target compressor unit; calculate the initial control parameters of the target compressor unit based on the operational monitoring data and preset operational control conditions; calculate the target mutual interference influence coefficient based on the associated control parameters and the associated control quantity gain, and use the target mutual interference influence coefficient to correct the initial control parameters to obtain target control parameters, wherein the target control parameters include drive motor control parameters and anti-surge valve control parameters; when the target control parameters meet the control parameter threshold, generate a control signal based on the target control parameters, and send the control signal to the drive motor and anti-surge valve of the target compressor unit until the global anti-surge valve in the compressor unit is closed, so as to perform operational start-up control on the target compressor unit; Any of the aforementioned drive units is configured to receive a first control signal corresponding to the drive unit control parameters, and adjust the rotational speed according to the control signal; Any of the aforementioned anti-surge valves is configured to receive a second control signal corresponding to the control parameters of the anti-surge valve, and adjust the opening degree according to the control signal; The data acquisition sensor is used to collect operational monitoring data of the corresponding compressor unit.
7. The system according to claim 6, characterized in that, The controller includes a drive motor control module and an anti-surge valve control module; The drive motor control module is used to calculate a first offset distance based on the outlet pressure value in the operation monitoring data and the pressure control safety threshold, and to perform proportional-integral calculation on the first offset distance to obtain the initial control parameters of the drive motor. The anti-surge valve control module is used to fit the operating monitoring data to obtain the operating point, and to perform proportional integral and step response calculations on the second offset distance between the operating point and the surge control line to obtain the initial control parameters of the anti-surge valve.
8. A storage medium storing at least one executable instruction that causes a processor to perform an operation corresponding to the control method for a multi-stage compressor unit as described in any one of claims 1-5.
9. A terminal, comprising: The processor, memory, communication interface, and communication bus are provided, wherein the processor, memory, and communication interface communicate with each other via the communication bus. The memory is used to store at least one executable instruction, which causes the processor to perform the operation corresponding to the control method of the multi-stage compressor unit as described in any one of claims 1-5.