Offshore platform water injection pump energy-saving regulation and control system and method

Abstract

The invention provides an energy-saving regulation and control system and method for a water injection pump of an offshore platform, and relates to the technical field of optimized regulation and control of the water injection pump of the offshore platform, the system comprises a basic data configurator, a flow lift relation fitting device, a flow efficiency relation fitting device, a flow power relation calculator, a real-time data collector, an energy-saving regulation and control device and a machine pump system; the method comprises the following steps: acquiring a performance curve of each pump in the pump system; calculating to obtain the relationship between the power and the flow of each pump; establishing a water injection pump energy-saving regulation and control model which comprises a target function and constraint conditions; and solving the energy-saving regulation and control model of the water injection pump, namely calculating the most energy-saving flow of each pump by adopting an equal-consumption micro-increasing rate rule, energy-saving regulation and control of the system pump set can be carried out only by utilizing the existing equipment without newly adding or transforming, the cost is low, the effect is good, and the method is easy to implement.

Description

Technical Field

[0001] The present invention relates to the technical field of optimization control of water injection pumps for offshore platforms, and particularly to an energy-saving control system and method for water injection pumps on offshore platforms. Background Art

[0002] As a major energy consumer on offshore oil and gas platforms, the power consumption of water injection pumps accounts for more than 30% of the total power consumption of the entire platform. Energy saving of water injection pumps plays a very important role in the production energy saving of offshore oil and gas platforms.

[0003] Currently, for the energy-saving control of water injection pumps, the conventional means are to use high-efficiency motors and pumps, perform variable frequency control on the motors, and optimize the energy saving of the water network, etc. These methods all have a certain energy-saving effect, but they require equipment replacement or modification, or the addition of new equipment, resulting in high costs and difficult implementation.

[0004] Therefore, there is an urgent need for an energy-saving control system and method for water injection pumps on offshore platforms to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an energy-saving control system and method for water injection pumps on offshore platforms to solve the technical problems existing in the prior art that the current methods such as using high-efficiency motors and pumps, performing variable frequency control on the motors, and optimizing the energy saving of the water network require equipment replacement or modification, or the addition of new equipment, resulting in high costs and difficult implementation. The many technical effects that can be produced by the preferred technical solutions among the many technical solutions provided by the present invention are described in detail below.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] An energy-saving control system for water injection pumps on an offshore platform provided by the present invention includes a basic data configurator, a flow-head relationship fitting device, a flow-efficiency relationship fitting device, a flow-power relationship calculator, a real-time data collector, an energy-saving controller, and a machine-pump system, wherein:

[0008] The output of the basic data configurator serves as the input of the flow-head relationship fitting device and the flow-efficiency relationship fitting device, and the outputs of the flow-head relationship fitting device and the flow-efficiency relationship fitting device serve as the input of the flow-power calculator;

[0009] The output of the machine-pump system serves as the input of the real-time data collector, the outputs of the real-time data collector and the flow-power relationship calculator serve as the input of the energy-saving controller, and the output of the energy-saving controller serves as the input of the motor controller of the electromechanical system.

[0010] Preferably, the flow-head relationship fitting device and the flow-efficiency relationship fitting device are in parallel.

[0011] Preferably, the real-time data collector and the flow-power relationship calculator are connected in parallel.

[0012] Preferably, the real-time data collector includes sensors, transmitters, and transmission lines for feeding back the performance parameters of the pump system to the energy-saving regulator in real time.

[0013] Preferably, the performance parameters include: motor voltage, current, power factor, speed, pump flow rate, pressure, and speed signal.

[0014] An energy-saving regulation method for a water injection pump on an offshore platform, using the above-mentioned energy-saving regulation system for a water injection pump on an offshore platform, includes the following steps:

[0015] Obtain the performance curves of each pump in the pump system;

[0016] Calculate the relationship between the power and flow rate of each pump through the performance curves;

[0017] Establish an energy-saving regulation model for the water injection pump, including an objective function and constraints;

[0018] Solve the energy-saving regulation model for the water injection pump, including using the equal incremental rate of consumption law to calculate the most energy-saving flow rate of each pump.

[0019] Preferably, the obtaining of the performance curves of each pump in the pump system includes:

[0020] Obtain the nameplate parameters of the controlled system through the basic data configurator, and input the head-flow curve and efficiency-flow curve of each pump into the energy-saving regulation system.

[0021] Preferably, the calculation of the relationship between the power and flow rate of each pump includes:

[0022] Convert the head-flow curve into a flow-head data table, and use the tabular data fitting to obtain the relationship between the head H i and the flow rate Q i of each pump: H i = f H-Q-i (Q i ), i = 1, 2,... n; where n is the number of regulated pumps;

[0023] Convert the efficiency-flow curve into a flow-efficiency data table, and use the tabular data fitting to obtain the relationship between the efficiency η i and the flow rate Q i of each pump: η i = f η-Q-i (Q i ), i = 1, 2,... n;

[0024] Using the head H of each pump i and the flow rate Q i relationship f H-Q and the pump efficiency η i and the flow rate Q i relationship f η-Q The relationship between power and flow rate is calculated as follows:

[0025]

[0026] where: K is a coefficient.

[0027] Preferably, the energy-saving control model of the water injection pump is established, where:

[0028] The objective function is:

[0029] The constraint conditions include:

[0030] Flow rate equality constraint to meet the requirements of the water injection process: where Q ∑ is the total demand for water injection flow rate;

[0031] Inequality constraint to meet the power limit of each pump: where, Q min,i are the rated power and the minimum flow rate of the i-th pump, respectively.

[0032] Preferably, solving the energy-saving control model of the water injection pump includes:

[0033] Using the Lagrange method, converting it into an equation in the form of equal incremental rate of consumption, and then solving it in combination with the equality constraint. The specific equation is as follows:

[0034]

[0035] By solving the energy-saving control model of the water injection pump, the flow rate control solution Q of each pump with the most energy-saving is calculated opt-i , i = 1, 2,... n;

[0036] Substituting the optimal control solution into the relationship between power and flow rate, the set power P of each pump controller is obtained opt-i = f P-Q-i (Q opt-i ), i = 1, 2,... n, and taking this value as the control target of the motor controller.

[0037] The energy-saving regulation system for water injection pumps on offshore platforms provided by the present invention includes a basic data configurator, a flow-head relationship fitting device, a flow-efficiency relationship fitting device, a flow-power relationship calculator, a real-time data collector, an energy-saving regulator, and a machine pump system. Through the cooperation of the basic data configurator, the flow-head relationship fitting device, the flow-efficiency relationship fitting device, the flow-power relationship calculator, the real-time data collector, the energy-saving regulator, and the machine pump system, only the existing equipment is utilized, and energy-saving regulation of the system pump group can be carried out without new addition or transformation, with low cost, good effect, and easy implementation.

[0038] The energy-saving regulation method for water injection pumps on offshore platforms provided by the present invention adopts the above-mentioned energy-saving regulation system for water injection pumps on offshore platforms, and includes the following steps: obtaining the performance curves of each pump in the machine pump system; calculating the relationship between the power and flow rate of each pump; establishing an energy-saving regulation model for water injection pumps, including an objective function and constraint conditions; solving the energy-saving regulation model for water injection pumps, including using the equal incremental rate of consumption law to calculate the most energy-saving flow rate of each pump. This method only utilizes the existing equipment, and energy-saving regulation of the system pump group can be carried out without new addition or transformation, with the characteristics of easy implementation, low cost, and good energy-saving effect. Brief Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 It is the schematic diagram of the energy-saving regulation system for water injection pumps on offshore platforms of the present invention;

[0041] Figure 2 It is the flow chart of the energy-saving regulation method for water injection pumps on offshore platforms of the present invention. Detailed Embodiments

[0042] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present invention.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0044] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Figure 1 is the schematic diagram of the energy-saving regulation system for the water injection pump of the offshore platform in this embodiment. As Figure 1 shown, this embodiment provides an energy-saving regulation system for the water injection pump of the offshore platform, which includes a basic data configurator, a flow-head relationship fitting device, a flow-efficiency relationship fitting device, a flow-power relationship calculator, a real-time data collector, an energy-saving regulator, and a pump-motor system.

[0046] Among them, in this embodiment, the flow-head relationship fitting device and the flow-efficiency relationship fitting device are in parallel. The output of the basic data configurator serves as the input of the flow-head relationship fitting device and the flow-efficiency relationship fitting device. The outputs of the flow-head relationship fitting device and the flow-efficiency relationship fitting device serve as the input of the flow-power calculator;

[0047] The output of the pump-motor system serves as the input of the real-time data collector. The real-time data collector and the flow-power relationship calculator are in parallel. The outputs of the real-time data collector and the flow-power relationship calculator serve as the input of the energy-saving regulator. The output of the energy-saving regulator serves as the input of the motor controller of the electromechanical system, and then finally executes the energy-saving regulation instruction.

[0048] Specifically, in this embodiment, the basic data configurator can input the nameplate parameters of the controlled system and the performance curve of the pump into the energy-saving regulation system. The flow-head relationship fitting device fits the flow-head performance curve of the configured pump into the form of a quadratic curve using the least squares method; the flow-efficiency relationship fitting device fits the flow-efficiency performance curve of the configured pump into the form of a quadratic curve using the least squares method; the flow-power relationship calculator is used to calculate the relationship between the power and flow of each pump.

[0049] The real-time data collector includes sensors, transmitters and transmission lines, and is used to feedback the performance parameters of the pump and motor system to the energy-saving regulator in real time. Among them, the performance parameters include: motor voltage, current, power factor, rotational speed, pump flow rate, pressure and rotational speed signal. The energy-saving regulator uses the data collected by the real-time data collector as the operating point, solves and calculates the fitted power-flow model, and adopts the equal incremental rate of consumption law to calculate the most energy-saving flow rate of each pump, so as to achieve the most energy-saving regulation of the pump and motor system.

[0050] This energy-saving regulation system for the water injection pump on the offshore platform only uses the existing equipment, and can carry out the energy-saving regulation of the system pump group without new addition or transformation, with low cost, good effect and easy to implement.

[0051] Figure 2 is the flow chart of the energy-saving regulation method for the water injection pump on the offshore platform. As Figure 2 shown, in order to achieve the energy-saving regulation of the water injection system on the offshore platform, this embodiment also provides an energy-saving regulation method for the water injection pump on the offshore platform. Using the above-mentioned energy-saving regulation system for the water injection pump on the offshore platform, the method includes the following steps:

[0052] S101: Obtain the performance curves of each pump in the pump and motor system; specifically including:

[0053] Obtain the nameplate parameters of the controlled system through the basic data configurator, and input the head-flow curve and efficiency-flow curve of each pump into the energy-saving regulation system.

[0054] S102: Calculate the relationship between the power and flow rate of each pump through the performance curve; specifically including:

[0055] S1021: Convert the head-flow curve into a flow-head data table, and use the tabular data fitting to obtain the relationship between the head H i and the flow rate Q i of each pump: H i = f H-Q-i (Q i ), i = 1, 2,... n; where n is the number of regulated pumps and motors;

[0056] Specifically, in this embodiment, the flow-head performance curve of the pump configured is fitted into the form of a quadratic curve by the flow-head relationship fitting device using the least square method:

[0057]

[0058] Among them: are the constant term, the first-order term coefficient, and the second-order term coefficient respectively obtained by fitting the flow-head curve of the i-th pump.

[0059] S1022: Convert the efficiency-flow curve into a data table of flow efficiency, and use the tabular data fitting to obtain the pump efficiency η i and the flow rate Q i relationship: η i = f η-Q-i (Q i ), i = 1, 2,... n;

[0060] Specifically, in this embodiment, the flow efficiency performance curve of the configured pump is fitted into a quadratic curve form by the flow efficiency relationship fitter using the least square method:

[0061]

[0062] Where: are the constant term, the first-order coefficient, and the second-order coefficient obtained by fitting the flow efficiency curve of the i-th pump, respectively.

[0063] S1023: Calculate the relationship between power and flow rate using the relationship f i between the head H of each pump i and the flow rate Q H-Q and the pump efficiency η i and the flow rate Q i relationship f η-Q :

[0064]

[0065] Where: K is a coefficient.

[0066] In this embodiment, K is taken as 9800 N / m 3 , and through the flow power relationship calculator, the specific implementation formula is as follows:

[0067]

[0068] S103: Establish an energy-saving regulation model for the water injection pump, including the objective function and constraints;

[0069] Among them, the objective function, that is, the energy-saving optimization objective to be minimized is:

[0070]

[0071] The constraints include:

[0072] Flow equality constraint that meets the water injection process requirements: Where Q ∑ is the total water injection flow demand;

[0073] Inequality constraint that meets the power limit of each pump: Among them, Q min,i are respectively the rated power and the minimum flow rate of the i-th pump.

[0074] S104: Solve the energy-saving regulation model of the water injection pump, including using the equal incremental rate of consumption law to calculate the most energy-saving flow rate of each pump.

[0075] Among them, for the solution of the established energy-saving regulation model of the water injection pump, using the Lagrange method, it is converted into an equation in the form of equal incremental rate of consumption, and then combined with the equality constraint for solution. The specific equation is as follows:

[0076]

[0077] By solving the energy-saving regulation model of the water injection pump, the flow rate regulation solutions of the most energy-saving pumps are calculated: Q opt-i , i = 1, 2,... n;

[0078] Substitute the optimal regulation solution into the relational expression of power and flow rate to obtain the set power of each pump controller: P opt-i = f P-Q-i (Q opt-i ), i = 1, 2,... n. Take this value as the control target of the motor controller, that is, the most energy-saving regulation is achieved.

[0079] Specifically, in this embodiment, through the energy-saving regulator, the data collected by the real-time data collector is used as the operating point, and the fitted power-flow relationship is expanded by the second-order Taylor series:

[0080]

[0081] Among them, Q it is the measured flow rate value of the i-th pump at time t.

[0082] The above formula is briefly recorded as:

[0083]

[0084] Using the equal incremental rate of consumption law, calculate the most energy-saving flow rate Q opt-i-t :

[0085]

[0086] Substitute the above formula to obtain the most energy-saving power command P opt-i-t of each pump as follows:

[0087] P opt-i-t = f P-Q-i (Q opt-i-t ), i = 1, 2,... n

[0088] This energy-saving regulation method for the injection pump of an offshore platform uses the above-mentioned energy-saving regulation system for the injection pump of an offshore platform. It only utilizes existing equipment and can conduct energy-saving regulation of the system pump set without new addition or modification. It has the characteristics of being easy to implement, low cost, and good energy-saving effect.

[0089] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. An energy-saving regulation system for a water injection pump on an offshore platform, characterized in that, It includes a basic data configurator, a flow-head relationship fitting device, a flow-efficiency relationship fitting device, a flow-power relationship calculator, a real-time data collector, an energy-saving regulator, and a pump-motor system, where: The output of the basic data configurator serves as the input of the flow-head relationship fitting device and the flow-efficiency relationship fitting device, and the outputs of the flow-head relationship fitting device and the flow-efficiency relationship fitting device serve as the input of the flow-power calculator; The output of the pump-motor system serves as the input of the real-time data collector, the outputs of the real-time data collector and the flow-power relationship calculator serve as the input of the energy-saving regulator, and the output of the energy-saving regulator serves as the input of the motor controller of the electromechanical system.

2. The energy-saving regulation system for a water injection pump on an offshore platform according to claim 1, wherein: The flow-head relationship fitting device and the flow-efficiency relationship fitting device are in parallel.

3. The energy-saving regulation system for the water injection pump of an offshore platform according to claim 1, wherein: The real-time data collector and the flow-power relationship calculator are in parallel.

4. The offshore platform water injection pump energy-saving control system according to claim 1, characterized in that: The real-time data collector includes sensors, transmitters, and transmission lines for real-time feedback of the performance parameters of the pump-motor system to the energy-saving regulator.

5. The energy-saving control system for a water injection pump on an offshore platform according to claim 4, wherein: The performance parameters include: motor voltage, current, power factor, speed, pump flow rate, pressure, and speed signal.

6. An energy-saving regulation method for a water injection pump on an offshore platform, characterized in that, Using the energy-saving regulation system for offshore platform water injection pumps according to any one of claims 1-5, the following steps are included: Obtain the performance curves of each pump in the pump-motor system; Calculate the relationship between the power and flow rate of each pump through the performance curves; Establish an energy-saving regulation model for the water injection pump, including an objective function and constraints; Solve the energy-saving regulation model for the water injection pump, including using the equal incremental rate of consumption law to calculate the most energy-saving flow rate of each pump.

7. A method for energy-saving regulation of a water injection pump on an offshore platform according to claim 6, characterized in that, The obtaining of the performance curves of each pump in the pump-motor system includes: Obtain the nameplate parameters of the controlled system through the basic data configurator, and input the head-flow curve and efficiency-flow curve of each pump into the energy-saving regulation system.

8. A method for energy-saving regulation of a water injection pump on an offshore platform according to claim 6, characterized in that, It is characterized in that The calculating of the relationship between the power and flow rate of each pump includes: Convert the head-flow curve into a flow-head data table, and use the tabular data fitting to obtain the head H of each pump i and the flow rate Q i relationship: H i = f H-Q-i (Q i ), i = 1, 2, … n; where n is the number of regulating pumps; Convert the efficiency-flow curve into a data table of flow efficiency, and use the tabular data fitting to obtain the pump efficiency η i and the flow rate Q i relationship: η i = f η-Q-i (Q i ), i = 1, 2, … n; Using the head H of each pump i and the flow rate Q i relationship f H-Q and the pump efficiency η i and the flow rate Q i relationship f η-Q The relationship between power and flow rate is calculated as follows: Where: K is a coefficient.

9. The energy-saving regulation method for the water injection pump of an offshore platform according to claim 6, wherein, The establishing of the energy-saving regulation model for the water injection pump, where: The objective function is: The constraints include: Flow equation constraint satisfying the requirements of the water injection process: where Q Σ is the total demand for water injection flow rate; Inequality constraints that satisfy the power limits of each pump and motor: where Q min,i are the rated power and minimum flow rate of the i-th pump, respectively.

10. A method for energy-saving regulation of an injection water pump on an offshore platform according to claim 9, characterized in that: The solving of the energy-saving regulation model for the water injection pump includes: Using the Lagrange method, convert it into an equation in the form of equal incremental rate of consumption, and then solve it in combination with the equality constraints. The specific equation is as follows: By solving the energy-saving regulation model of the water injection pump, the flow regulation solution Q of each pump with the most energy-saving is calculated opt-i , where i = 1, 2, … n; Substitute the optimal regulation solution into the relationship between power and flow rate to obtain the set power P of each pump controller opt-i = f P-Q-i (Q opt-i ), i = 1, 2, … n, and use this value as the control target of the motor controller.

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