CN113281992A - Automatic distribution control system and distribution method thereof - Google Patents
Automatic distribution control system and distribution method thereof Download PDFInfo
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- CN113281992A CN113281992A CN202110634148.0A CN202110634148A CN113281992A CN 113281992 A CN113281992 A CN 113281992A CN 202110634148 A CN202110634148 A CN 202110634148A CN 113281992 A CN113281992 A CN 113281992A
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- G05B11/00—Automatic controllers
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- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
Abstract
The invention discloses an automatic sub-transmission control system, which comprises a station control system, an automatic sub-transmission station, a pressure regulating controller, at least one set of regulating valve and a process pipeline matched with the regulating valve, wherein each sub-transmission module in the automatic sub-transmission station is provided with the pressure regulating controller, the process pipeline is provided with a flow sensor and a pressure sensor, the flow sensor, the pressure sensor and the regulating valve on the process pipeline are connected into the pressure regulating controller, and the station control system sends operating parameters input from an operating interface to the pressure regulating controller; the voltage regulation controller returns the target value to the station control system after carrying out a related PID control algorithm; and the station control system controls the corresponding regulating valve to carry out gas transmission control. The invention also discloses a distribution method of the automatic distribution control system. The automatic distribution control system and the distribution method thereof effectively solve the problems of single function, low response speed, low precision, large overshoot and the like of the conventional distribution control system.
Description
Technical Field
The invention belongs to the technical field of natural gas pipelines, and particularly relates to an automatic distribution control system and a distribution method thereof.
Background
For a long time, high-performance pressure regulating controllers used for natural gas long-distance pipelines are basically imported equipment, in recent years, pressure regulating controllers of some domestic regulating valves appear in the industry of natural gas pipelines, but due to the reasons of insufficient automatic control technical experience or insufficient hardware performance of the controllers, the functions and the performance of the domestic valve controllers reach the level of the imported pressure regulating controllers. Some manufacturers adopt a low-end RTU as a valve control core, which can reduce hardware cost, but cause insufficient performance of the controller, and restrict the overall function and performance. Another part of manufacturers adopt the PLC as a valve control core, and although hardware performance can be guaranteed, since the programming adopts a standard PLC language, the limitation is too large, advanced control algorithms cannot be adopted, accurate flow estimation cannot be realized, and a multi-branch flow regulation function cannot be realized.
The automatic control function of the domestic natural gas long-distance pipeline is analyzed, some short plates exist, part of stations lack the flow control function of the branch transmission user level, users of multiple adjusting branches cannot realize automatic flow distribution, the pressure flow of each branch is directly controlled by the adjusting and controlling center, and the workload of the adjusting and controlling center is increased; in addition, because some stations are not provided with valve controllers, and the instantaneous flow of each adjusting branch cannot be obtained for the process working condition that a manifold is arranged after metering and a plurality of adjusting branches are arranged, the flow control of the adjusting branches cannot be realized, the adjusting branches have no priority automatic switching function, the flow pressure adjusting performance (such as adjusting speed, overshoot and the like) of a single branch is required to be further improved, and the problems bring some difficulties to the popularization of automatic distribution. There is a need for an integrated solution that can not only realize the flow and pressure regulation of a single circuit, and can automatically and smoothly switch, but also can realize the split-range control of multiple circuits of a split-delivery user, and finally achieve the automatic split-delivery function required by intelligent operation.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. The invention further develops an automatic distribution control system on the basis of the original user day-designated distribution system, realizes a hardware integration solution of a pressure regulating controller and a user automatic distribution controller, completes intelligent pressure and flow regulation and optimization and promotion of the automatic distribution technical function, and solves the problems of single function, low response speed, low precision, large overshoot and the like of the existing distribution control system. The invention also provides a distribution method of the automatic distribution control system.
The purpose of the invention is realized by the following technical scheme:
an automatic sub-transmission control system comprises a station control system, an automatic sub-transmission station, a pressure regulating controller, at least one set of regulating valve and a process pipeline matched with the regulating valve, wherein each sub-transmission module in the automatic sub-transmission station is provided with the pressure regulating controller, the process pipeline is provided with a flow sensor and a pressure sensor, the flow sensor, the pressure sensor and the regulating valve on the process pipeline are connected to the pressure regulating controller, and the station control system sends operation parameters input from an operation interface to the pressure regulating controller; the voltage regulation controller returns the target value to the station control system after carrying out related PID control algorithm; the station control system controls the corresponding regulating valve to carry out gas transmission control; the operating parameters include a pressure value, a flow value, a pressure upper limit value and a pressure lower limit value set on the process pipeline.
Preferably, the process pipeline is a single-branch process pipeline, and the PID control algorithm in the pressure regulating controller is a pressure-flow balance control method, a valve prediction control method and an output external feedback method, which obtain a target value through pressure values and flow values, an upper pressure limit value and a lower pressure limit value on the process pipeline.
Preferably, the process pipeline is a multi-branch process pipeline, the regulating valve of each branch is set with an upper limit value, the branches are selected step by step according to a priority or availability principle, the PID control algorithm in the pressure regulating controller is a balance control method, a valve prediction control method, and an output external feedback method that obtain a target value through a pressure value and a flow value of each branch on the process pipeline, a pressure upper limit value and a pressure lower limit value of each branch, and the flow value is the sum of flows on all single branches.
Preferably, the PID control algorithm in the pressure regulating controller further comprises a regulating valve position control rate method.
Preferably, the PID control algorithm in the voltage regulation controller further includes a set value dynamic adjustment method.
Preferably, the method for dynamically adjusting the set value comprises a set value change rate method and a set value-order filtering method.
Preferably, the PID control algorithm in the pressure regulating controller further comprises an automatic calculation method of the upper limit value of the regulating valve.
Preferably, the PID control algorithm in the voltage regulation controller further comprises a fuzzy control method.
Preferably, the pressure value and the flow value set on the process pipeline are obtained by an automatic natural gas distribution system.
A distribution method of the automatic distribution control system comprises the following steps:
1) acquiring a pressure value, a flow value, a pressure upper limit value and a pressure lower limit value which are set for the first time through a natural gas automatic distribution and transmission system;
2) inputting the pressure value, the flow value, the upper pressure limit value and the lower pressure limit value obtained in the step 1) through an operation interface in a station control system and sending the pressure value, the flow value, the upper pressure limit value and the lower pressure limit value to the pressure regulating controller;
3) the voltage regulation controller returns a target value obtained by a relevant PID control algorithm to the station control system; and the station control system controls the corresponding regulating valve to carry out gas transmission control.
Compared with the prior art, the invention has at least the following advantages:
the invention provides an automatic sub-transmission control system which comprises a station control system, an automatic sub-transmission station, a pressure regulating controller, at least one set of regulating valve and a process pipeline matched with the regulating valve, wherein each sub-transmission module in the automatic sub-transmission station is provided with the pressure regulating controller, the process pipeline is provided with a flow sensor and a pressure sensor, the flow sensor, the pressure sensor and the regulating valve on the process pipeline are connected into the pressure regulating controller, and the station control system sends operation parameters input from an operation interface to the pressure regulating controller; the voltage regulation controller returns the target value to the station control system after carrying out related PID control algorithm; the station control system controls the corresponding regulating valve to carry out gas transmission control; the operation parameters comprise a pressure value, a flow value, a pressure upper limit value and a pressure lower limit value which are set on the process pipeline, and a pressure regulating controller is arranged on a sub-transmission module of the automatic sub-transmission station, and a target value obtained by a relevant PID control algorithm is carried out on the pressure regulating controller, so that the response speed of the automatic sub-transmission control system is high; meanwhile, the pressure value and the flow value on the process pipeline are continuously iterated between the obtained target value and the operation parameter, so that the distribution volume is more accurate.
Drawings
FIG. 1 is a schematic structural diagram of an automatic dispatch control system according to the present invention;
FIG. 2 is a diagram illustrating the effect of pressure regulation on a single process line in an automatic split-flow control system according to the present invention;
FIG. 3 is a diagram illustrating the effect of flow regulation of a single-branch process line in the automatic distribution control system according to the present invention;
FIG. 4 is a flow effect diagram illustrating pressure-flow balance control on a single-branch process line in the automatic distribution control system provided by the present invention;
FIG. 5 is a graph illustrating the effect of outlet pressure during pressure flow balance control on a single-branch process line in the automatic split-flow control system provided by the present invention;
FIG. 6 is a schematic diagram of the operation of the pressure-flow balance control method in the automatic distribution control system according to the present invention;
FIG. 7 is a diagram illustrating the effectiveness of one embodiment of the present invention in providing an automatic split control system for a single process line;
FIG. 8 is a diagram illustrating the effect of the voltage regulator controller;
FIG. 9 is a graph illustrating the effectiveness of another embodiment of the present invention in providing an automatic split control system for a single process line;
FIG. 10 is a schematic diagram of a multi-branch process line in the automatic distribution control system according to the present invention;
FIG. 11 is a schematic diagram illustrating the range operation of the regulating valves in the multi-branch process pipeline in the automatic distribution control system according to the present invention;
FIG. 12 is a diagram illustrating the operation of the multi-branch process line in the automatic distribution control system in the pressure regulation mode according to the present invention;
FIG. 13 is a diagram illustrating the operation of a multi-branch process line in an automatic distribution control system according to the present invention in a flow adjustment mode;
FIG. 14 is a diagram illustrating the effect of valve operating states when multiple process pipelines are separately controlled in an automatic distribution control system according to the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Descriptions in this specification as relating to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to any indicated technical feature or quantity. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Example 1
As shown in fig. 1, an automatic distribution control system comprises a station control system 2, an automatic distribution station 1, a pressure regulating controller 3, at least one set of regulating valve 4, and a process pipeline matched with the regulating valve, wherein each distribution module in the automatic distribution station 1 is provided with the pressure regulating controller 3, specifically, the automatic distribution station 1 is provided with the station control system 2, the automatic distribution station 1 is provided with a plurality of distribution modules, each distribution module corresponds to a distribution user, each distribution module is provided with the pressure regulating controller 3, namely, each distribution user is provided with one pressure regulating controller 3, the process pipeline is provided with a flow sensor 5 and a pressure sensor 6, the flow sensor 5, the pressure sensor 6 and the regulating valve 4 on the process pipeline are connected to the pressure regulating controller, the flow sensor 5 and the pressure sensor 6 on the process pipeline are used for measuring the flow and the pressure of the process pipeline, the station control system 2 sends the operation parameters input from the operation interface to the voltage regulation controller 3; the voltage regulation controller 3 returns the target value to the station control system 2 after carrying out related PID control algorithm; the station control system 2 controls the corresponding regulating valve to carry out gas transmission control; the operation parameters comprise a pressure value, a flow value, a pressure upper limit value and a pressure lower limit value which are set on a process pipeline; when the natural gas automatic distribution and transmission system is used specifically, a pressure value, a flow value, a pressure upper limit value and a pressure lower limit value which are set for the first time are obtained through the natural gas automatic distribution and transmission system; inputting the obtained pressure value, flow value, pressure upper limit value and pressure lower limit value through an operation interface in the station control system 2 and sending the pressure upper limit value and the pressure lower limit value to the pressure regulating controller 3; the voltage regulation controller 3 returns the target value obtained by the relevant PID control algorithm to the station control system 2; the station control system 2 controls the corresponding regulating valve 4 to carry out gas transmission control, the target value obtained by carrying out the PID control algorithm on the pressure regulating controller 1 enables the response speed of the automatic sub-transmission control system to be high, and meanwhile, the pressure value and the flow value on the process pipeline are continuously iterated between the obtained target value and the operation parameter, so that the sub-transmission quantity is more accurate.
Preferably, in a preferred technical solution of this embodiment, the pressure regulating controller may also be directly provided with a liquid crystal display screen for directly inputting the operation parameters, and meanwhile, the pressure regulating controller receives real-time parameters of the pressure value, the flow value, and the valve opening value in the process line, and the pressure regulating controller receiving the operation parameters and the real-time parameters performs a related PID control algorithm to obtain control parameters, so as to control the corresponding regulating valve to perform gas transmission control.
Example 2
On the basis of the embodiment 1, wherein the process pipeline is a single-branch process pipeline, the PID control algorithm in the pressure regulating controller 3 is a pressure flow balance control method, a valve prediction control method and an output external feedback method, which obtain a target value through pressure values and flow values, an upper pressure limit value and a lower pressure limit value on the process pipeline. When the pressure regulating device is used specifically, aiming at different application working conditions in the future, a combined PID control model of a uniform pressure value, a flow value, an upper pressure limit value and a lower pressure limit value is established on a pressure regulating controller, and the mutual tracking and undisturbed switching of 4 PID models (the pressure value, the flow value, the upper pressure limit value and the lower pressure limit value) during switching are ensured by a valve prediction control method and an external feedback control method, so that the upper flow limit protection during pressure regulation and the upper pressure limit value and the lower pressure limit value protection during flow regulation are realized; the automatic distribution control system in the embodiment is used for field test verification through the distribution method in the embodiment 1:
the test results when the process pipeline of a single branch is pressure-regulated are as follows: as shown in fig. 2, when the flow rate setting value is much larger than the flow rate measurement value, the pressure regulation mode is automatically set, the current pressure is 4.61MPa, the pressure setting value is set to 4.72MPa, and the regulation time is 6 minutes; the steady state error is 0.001MPa, and the steady state precision is 0.02%; the overshoot is less than 0.01 MPa;
the test results when the flow of the single-branch process pipeline is regulated are as follows: as shown in fig. 3, the pressure set point is much higher than the pressure measurement, and the flow regulation mode is automatically entered, with a flow set point of 10 ten thousand Nm3The/h rises to 20 ten thousand Nm3H, reach set point in 3 minutes, steady state error 622Nm3/h, steady state accuracy 0.3%, overshoot 792Nm3H, the overshoot is less than 0.4%;
the test results when the pressure flow balance control is performed on the process pipeline with the single branch are as follows: as shown in fig. 4 and 5, when the pressure set point is much greater than the pressure measurement, the system automatically adjusts for flow rates from 5 ten thousand Nm3The/h rises to 18 ten thousand Nm3H; and when the pressure rises to be close to the set value, the system automatically changes to pressure regulation, the flow rate is kept consistent with the user consumption, and the flow rate is ensured to be stabilized at the set value. The pressure and flow balance control function is realized, namely, the flow upper limit protection is realized during pressure regulation, and the pressure upper limit value and the lower limit value protection are realized during flow regulation;
namely, when the automatic distribution control system is used for a single-branch process pipeline: the pressure regulating precision of the single-branch process pipeline reaches 1%, the regulating time is less than 10min, and the overshoot is less than 0.1 MPa; the steady-state precision of the single-branch flow regulation reaches 2%, the regulation time is less than 5min, and the overshoot is less than 5%.
The valve predictive control method is characterized in that predictive control is carried out by utilizing a valve characteristic curve and an expected target, initial configuration parameters are set in a controller aiming at regulating valves of different brands and calibers, the valve characteristic curve parameters can be dynamically self-learned in the operation process, the optimal characteristic values are continuously optimized, the accuracy of early open-loop predictive control is ensured, the smooth transition of the open-loop predictive control and the closed-loop PID control is ensured, and large fluctuation or overshoot is avoided.
The output external feedback method is that the final output values of the 4 PID models are fed back to the input of each PID in real time to be used as the integral term of each PID for the previous time, and then the proportional, integral and differential terms are recalculated to obtain the new output of the 4 PID models.
The pressure and flow balance control method is characterized in that 4 PID combined control models of a pressure value PID, a flow value PID, a pressure upper limit value PID and a pressure lower limit value PID are established on a pressure regulating controller, the 4 PID models perform independent PID calculation, the output of the 3 models of the pressure PID, the flow PID and the pressure upper limit value PID is subjected to low selection, then the low selection result and the output value of the pressure lower limit PID are subjected to high selection, and the output after the high selection is used as the final output of PID control, so that the balance control of pressure and flow is realized, and the control principle is shown in FIG. 6.
In another preferred technical solution of this embodiment, for a working condition with a large amount of downstream pipe storage of the automatic distribution station 1, the overshoot amount and the response time are contradictory, that is, the two cannot obtain a small optimal value, in order to increase the regulation speed and reduce the overshoot amount, the PID control algorithm in the pressure regulating controller 3 further includes a fuzzy control method, specifically, a deviation e between a measured value and a set value of the pressure regulating controller and a change rate ec thereof are used as two input quantities, a defuzzification numerical value of a dynamically changing proportional, integral and differential action is obtained through inference of the fuzzy algorithm, and is used as a corresponding control output quantity, and is correspondingly adjusted by combining with a preset pressure regulating controller, so that the overshoot of the system is suppressed as much as possible under the condition of ensuring an increased regulation speed of the system.
Therefore, the voltage regulation controller added with the fuzzy control method, the voltage regulation controller on the current market and the voltage regulation controller not added with the fuzzy control method are tested and verified on site in the petrochemical direction in the average transmission station:
the test results of the voltage regulation controller without adding the fuzzy control method are as follows, as shown in fig. 7: the station control system regulates the pressure, and the pressure set value is adjusted from 4.61MPa to 4.71 MPa; the adjusting time is 15 minutes, 10 minutes beyond the index requirement, the analysis reason is that the downstream is the medium petrochemical safety direction, and the downstream user inventory is large;
the test results of the voltage regulation controllers on the market are as follows, as shown in fig. 8: the station control system regulates the pressure, and the pressure set value is adjusted from 4.62MPa to 4.71 MPa; the adjusting time is more than 30 minutes and exceeds 10 minutes required by the index, the analyzing reason is that the downstream is the medium petrochemical safety direction, the downstream user pipe stock is large, and in addition, the parameter setting of the valve controller is not optimized, so that the adjusting speed is slow.
The test result of the voltage regulation controller added with the fuzzy control method is as follows, as shown in fig. 9: the station control system regulates the pressure, and the pressure set value is adjusted from 4.62MPa to 4.72 MPa; the adjusting time is 5 minutes and is less than 10 minutes required by the index; the steady state error is 0.005MPa, and the steady state precision is 0.1 percent; the overshoot is 0.005MPa and is far less than 0.1MPa, and the analysis shows that the fuzzy control can accelerate the regulation speed of pressure control, reduce the overshoot and improve the pressure regulation performance of the pressure regulation controller by the automatic regulation mode of PID parameters in the regulation process.
Example 3
As shown in fig. 10 and 11, in the process working conditions of each branch transmission station of the existing long-distance natural gas transmission pipeline, a plurality of branches are often provided for the same branch transmission user, and the metering pipelines 71 and the pressure regulating pipelines 73 of part of stations are connected by adopting the manifolds 72, so that when a plurality of branches are used simultaneously, the exact instantaneous flow of each branch cannot be known, and a certain difficulty is brought to accurate flow regulation;
therefore, in this embodiment, on the basis of embodiment 2, when the process pipeline is a multi-branch process pipeline, an upper limit value is set for the regulating valve of each branch, and the branches are selected step by step according to a priority or availability principle, wherein a priority and availability operator can set the upper limit value by himself/herself, for example, five branches are provided on the process pipeline, and branch 1, branch 2, branch 3, branch 4, and branch 5 can be set to be sequentially preferred, and when only three branches need to be used, branch 1, branch 2, and branch 3 are preferentially used, and when one branch among branch 1, branch 2, and branch 3 cannot be used (available), the branch 4 is automatically switched to, and so on; the PID control algorithm in the pressure regulating controller obtains a target value by a pressure flow balance control method, a valve prediction control method and an output external feedback method of the pressure value and the total flow value of each branch on the process pipeline, the pressure upper limit value of each branch and the pressure lower limit value of each branch, and the total flow value is the sum of the flows on all the single branches.
For flow pressure regulation, the invention adopts split-range control, does not need to know the accurate flow of each regulating branch, only needs to know the total flow value of the sub-transmission user, and realizes the total flow and pressure control of the sub-transmission user through the split-range control among a plurality of branches; the method specifically comprises the following steps: regarding a plurality of regulating branches as different branches of a large regulating branch, calculating and controlling by using 1 pressure flow balance control 4 PID models, specifically, calculating and controlling by using a pressure value, a pressure upper limit value and a pressure lower limit value on one branch and 4 PID models of a total flow value on a plurality of branches; and simultaneously setting an upper limit value for each branch regulating valve, wherein the total PID flow output range upper limit is the sum of the upper limit values of the single branch valves in all the use states, the total instantaneous flow of the sub-transmission users is fed back by the flow, and the flow output in the pressure regulating controller is gradually distributed to the regulating valves of each regulating branch according to the priority and the availability. Therefore, the pressure regulating controller can realize the flow and pressure control of the sub-transmission users by only knowing the total instantaneous flow of the sub-transmission users through the split-range control among the plurality of branches;
the PID control algorithm in the pressure regulating controller also comprises a valve position control rate regulating method, and specifically, valve position setting change rate limitation is carried out on a valve position control signal output by the PID on the pressure regulating controller, and the valve position setting change rate limitation is usually set to be 1%/second.
The PID control algorithm in the pressure regulating controller also comprises a set value dynamic adjusting method, namely, a dynamic change limit is carried out on the set values of the pressure and the flow in the process pipeline, wherein the set value dynamic adjusting method comprises a set value change rate method and a set value-order filtering method.
The set value change rate method specifically limits the change rate of pressure and flow set values in the adjusting process, the limit value is usually set to be 1% of the maximum value/second, the limit value can be manually set according to specific working conditions, the set value change rate is directly output when being smaller than the limit value, the set value change rate is only output according to the limit value when being larger than the limit value, and the smoothness and the continuity of the adjustment are guaranteed.
Set value first order filtering method: specifically, first-order inertia low-pass filtering is carried out on pressure and flow set values in the adjusting process, high-frequency fluctuation of the set values caused by interference or other reasons is removed, and smoothness and continuity of adjustment are guaranteed.
The PID control algorithm in the pressure regulating controller also comprises an automatic calculation method for the upper limit value of the regulating valve, specifically, in the process of the multi-branch regulating valve split-range control, the upper limit value of each branch regulating valve needs to be set, the scheme adopts two modes of manual setting and automatic calculation, the automatic calculation method adopts table lookup calculation according to the station entering pressure, the pipeline gas flow rate and the valve Cv value, the calculation is carried out in real time, and the automatic calculation is automatically updated when the value is changed by 5% (can be set) compared with the value used in use.
The automatic distribution control system in the embodiment is used for field test verification through the distribution method in the embodiment 1:
the test results for the multi-branch process pipeline with pressure regulation are as follows: as shown in FIG. 12, the station control system adjusts the pressure, and the set pressure value is adjusted from 4.61MPa to 4.71MPa for 16 minutes. The analysis reason is that the downstream is in the direction of medium petrochemical safety, and the downstream user has larger management quantity; the steady state error is 0.006MPa, and the steady state precision is 0.1%; the overshoot is 0.1MPa, and the analysis reason is that the overshoot is increased because the control parameter is increased to accelerate the adjustment speed;
the test results of the multi-branch process pipeline for flow regulation are as follows: as shown in fig. 13, the station control system performs flow regulation, and the flow set value is from 3 ten thousand Nm3H to 25 ten thousand Nm3H is used as the reference value. The actual adjustment time is 5 minutes; steady state error 1411Nm3/h, steady state accuracy 0.5%; overshoot 7577Nm3/h, the overshoot is less than 3%;
as shown in fig. 14, the test results when adjusting the split-range control of the multi-branched process line are as follows: the flow rate set point is from 3 ten thousand Nm3H to 25 ten thousand Nm3The limiting amplitude of each branch valve is 50 percent; the first stage is as follows: the first branch increases from 26.6% to a maximum limit of 50%, and then remains unchanged; and a second stage: the second branch is increased from 0% to 45.4%, and the flow reaches a target value and is stable;adjusting the time for 5 minutes; steady state error 1411Nm3H, steady state precision 0.5%; overshoot 7577Nm3And h, the overshoot is less than 3%.
Namely, when the automatic distribution control system is used for a multi-branch process pipeline: the pressure regulation precision of the multi-branch process pipeline reaches 1 percent, and the regulation time is less than 10 min; the steady-state precision of the multi-branch flow regulation reaches 2%, and the regulation time is less than 5 min.
Example 4
On the basis of the embodiment 2 and/or the embodiment 3, the pressure value and the flow value set on the process pipeline are obtained from the natural gas automatic distribution system, and the upper pressure limit value and the lower pressure limit value are set according to the actual use condition. The automatic natural gas distribution and transmission system can refer to the following patents: the applicant: the Beijing eastern Huazhi Petroleum engineering Co., Ltd applied for patent number 201710423267.5 on 2017, 06 month 07: according to the method and the system for automatically distributing and transporting the natural gas, the set pressure value and flow value on the process pipeline are obtained through the technical scheme of the patent, so that the effects that the automatic distribution and transportation based on an energy metering mode is realized, and the error of the daily specified completion rate is less than 1 percent are achieved.
The voltage regulation controller in the automatic distribution and transmission control system adopts the modularized design and has strong adaptability, can be rapidly configured according to different process parameters of a distribution and transmission module, optimizes and adjusts the parameters of the voltage regulation controller according to operation data, meets different distribution and transmission flows and working conditions, and is easy to popularize.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An automatic distribution control system is characterized in that: the system comprises a station control system, an automatic sub-transmission station, a pressure regulating controller, at least one set of regulating valve and a process pipeline matched with the regulating valve, wherein each sub-transmission module in the automatic sub-transmission station is provided with the pressure regulating controller, the process pipeline is provided with a flow sensor and a pressure sensor, the flow sensor, the pressure sensor and the regulating valve on the process pipeline are connected to the pressure regulating controller, and the station control system sends operation parameters input from an operation interface to the pressure regulating controller; the voltage regulation controller returns the target value to the station control system after carrying out related PID control algorithm; the station control system controls the corresponding regulating valve to carry out gas transmission control; the operating parameters include a pressure value, a flow value, a pressure upper limit value and a pressure lower limit value set on the process pipeline.
2. The automatic branch transmission control system according to claim 1, wherein the process pipeline is a single-branch process pipeline, and the PID control algorithm in the pressure regulating controller is a pressure-flow balance control method, a valve prediction control method and an output external feedback method, which obtain a target value by using a pressure value, a flow value, a pressure upper limit value and a pressure lower limit value on the process pipeline.
3. The automatic branch control system according to claim 2, wherein the process pipeline is a multi-branch process pipeline, the regulating valve of each branch is set with an upper limit value, the branches are selected step by step according to a priority or availability principle, the PID control algorithm in the pressure regulating controller is a target value obtained by a balance control method, a valve prediction control method, and an output external feedback method of a pressure value and a flow value of each branch on the process pipeline, a pressure upper limit value and a pressure lower limit value of each branch, and the flow value is a sum of flows on all single branches.
4. An automatic dispatch control system as claimed in claim 3, wherein the PID control algorithm in the regulator controller further comprises a regulator valve position control rate method.
5. The automatic split-transmission control system as claimed in claim 4, wherein the PID control algorithm in the pressure regulating controller further comprises a dynamic set point adjustment method.
6. The integrated automatic control device according to claim 5, wherein the setpoint dynamics adjustment method comprises a setpoint rate of change method and a setpoint-order filtering method.
7. The automatic split-input control system as claimed in claim 5, wherein the PID control algorithm in the pressure regulating controller further comprises an automatic calculation method of the upper limit value of the regulating valve.
8. The automatic split-transmission control system as claimed in claim 6, wherein the PID control algorithm in the self-regulating voltage controller further comprises a fuzzy control method.
9. The automatic distribution control system of claim 1, wherein the pressure and flow values set on the process pipeline are obtained by an automatic natural gas distribution system.
10. A dispensing method of an automatic dispensing control system according to claim 9, comprising the steps of:
1) acquiring a pressure value, a flow value, a pressure upper limit value and a pressure lower limit value which are set for the first time through a natural gas automatic distribution and transmission system;
2) inputting the pressure value, the flow value, the upper pressure limit value and the lower pressure limit value obtained in the step 1) through an operation interface in a station control system and sending the pressure value, the flow value, the upper pressure limit value and the lower pressure limit value to the pressure regulating controller;
3) the voltage regulation controller returns a target value obtained by a relevant PID control algorithm to the station control system; and the station control system controls the corresponding regulating valve to carry out gas transmission control.
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