CN113445054B - Control method for improving impressed current cathodic protection reliability of offshore wind power pile foundation - Google Patents
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- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/04—Controlling or regulating desired parameters
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention discloses a control method and a control system for improving impressed current cathodic protection reliability of an offshore wind power pile foundation, which are applied to an impressed current cathodic protection system. Under a normal protection state, the system outputs in a constant potential operation mode, and when the system encounters extreme working conditions or a reference electrode which is controlled by the system fails, the system is automatically switched into a constant current mode to set upper and lower limit values of output current for outputting, so that the over-limit output of an impressed current cathodic protection system under the extreme abnormal working conditions is prevented from causing the over-protection or under-protection of a protected structure, and the operation reliability of the impressed current cathodic protection system is improved; meanwhile, the output current of the numerical control high-frequency switching power supply can be controlled in real time through technologies such as closed-loop PID incremental adjustment and PWM modulation, and when the output protection current exceeds a protection current output limit interval, the constant potential control mode is automatically switched to a constant current control mode, and constant current output is carried out according to the set upper limit and lower limit of the output current.
Description
Technical Field
The invention relates to the technical field of cathodic protection and corrosion prevention, in particular to a control method for improving the reliability of impressed current cathodic protection of an offshore wind power pile foundation.
Background
Offshore wind power is used as clean energy mainly developed by the state in recent years, the single machine installed capacity is large, the number of hours is effectively utilized, land resources are not occupied, and the offshore wind power generation system is close to the national coastal power load center and has wide application prospect. The underwater foundation of the offshore wind power has various structural forms, such as a single pile type, a pile group type, a floating type, a negative pressure bucket type, a conduit frame type and the like, and is usually protected by combining cathode protection and an anticorrosive coating when being in a harsh marine corrosion environment in open sea for a long time.
The cathodic protection technology is an effective means for corrosion prevention control, and is widely applied to protection of important facilities and equipment such as ships, oil platforms, pipelines, bridge wharfs, offshore wind power and the like. The cathodic protection technology is divided into sacrificial anodic protection technology and impressed current protection technology. By sacrificial anodic protection is meant the connection of the protected metal to another metal or alloy of lower electrode potential so that the metal or alloy is preferentially consumed as the anode and the protected metal is protected by the cathodic current. The impressed current cathodic protection system is generally composed of three parts of direct current, an auxiliary anode and a reference electrode, and an external direct current source and the auxiliary anode provide extra cathodic current for a protected metal structure, so that the corrosion of the protected metal is inhibited. In the cathode polarization process, the polarization potential of the protected structure can be changed due to the change of external environment, such as environment parameters of dissolved oxygen content, temperature, ocean current, salt content and the like, and the dynamic balance of the polarization potential of the protected structure can be maintained only by adjusting the magnitude of polarization output current in real time.
Compared with sacrificial anode cathodic protection, the impressed current cathodic protection system is suitable for various seawater working conditions, has stronger output regulating capability and small system load, can realize remote intelligent digital control, and is more suitable for cathodic protection of offshore wind power pile foundations. The potentiostat is used as a core device of an impressed current cathodic protection system and is responsible for regulating output current according to a protection potential measurement result, and the key of whether a protected structure can obtain a good protection effect is provided. The existing direct current potentiostat mainly comprises three output modes of constant potential control, constant current control and constant voltage control. The constant potential operation mode means that the potentiostat adjusts the output current by comparing the difference between the protective potential measured by the reference electrode and the set given protective potential, so that the protective potential of the protected structure is maintained near the given protective potential. The constant current operation mode means that the potentiostat outputs current according to set given current, the output current is constant and does not change along with the change of the protection potential. The constant voltage operation mode means that the potentiostat outputs current according to set given voltage, and the output current changes along with the change of the resistance of a system loop. The constant potential control method can maintain the potential of the structure/electrolyte system constant within a specified protection potential range by continuously adjusting the protection current, and is mostly used as an operation mode under a normal working condition. However, under complex ocean conditions, the reliability and stability of the reference electrode participating in current output control are very important, because in actual operation, all adjustments are based on the parameter, and if a problem occurs, the basic adjustment of the output current causes a large potential safety hazard under the constant potential mode operation according to deviation. That is, if the conditions of reference electrode abnormality (electrode water seepage corrosion, external force damage including floating ice, self dissolution, virtual connection of the end joint of the measurement loop, etc.), severe external working condition change (adhesion by marine organisms, coverage by dirt, sea mud back silting), etc., short-term sudden change or long-term deviation of the measurement potential is often caused, so that the output current of the impressed current cathodic protection system is extremely small (no current output, under protection) or extremely large (the output current exceeds the design limit, over protection), and the protection effect of the impressed current cathodic protection system on the structure is directly influenced.
For example, CN202688452U invented an impressed current cathodic protection system suitable for offshore wind power pile foundation based on a common auxiliary anode form for ship outer wall protection, the system only adjusts current output by comparing a difference between a measured protection potential and a set protection potential as a judgment basis, control logic and algorithm are simple, and influence of extreme working conditions of offshore wind power is not considered; for another example, CN103726057A introduces an impressed current cathodic protection system for the triangular pile foundation structure of offshore wind power, and the control system part belonging to the patent has two modes of constant potential control and constant current control, which is also an operation mode of a potentiostat used in the impressed current cathodic protection system in various industries at present, and does not consider the particularity of unmanned offshore wind power and extreme offshore sea conditions.
Therefore, the potentiostats belonging to the above patents are all common output control methods, and the potentiostat control logic and algorithm are not designed and developed in a targeted manner aiming at the extreme working conditions of offshore wind power, so that when the master control reference electrode or the measurement circuit fails, the situation of long-term over-protection or under-protection is easy to occur.
Disclosure of Invention
Based on the above, in order to solve the defects in the prior art, a control method for improving the impressed current cathodic protection reliability of the offshore wind power pile foundation is provided.
A control method for improving impressed current cathodic protection reliability of an offshore wind power pile foundation is applied to an impressed current cathodic protection system and is characterized by comprising the following steps of:
s1, determining corresponding control parameters in a constant potential operation mode, wherein the control parameters at least comprise a target potential, a protection potential alarm upper/lower limit value, an alarm current upper/lower limit value, an output current upper/lower limit value and PID (proportion integration differentiation) adjusting parameters;
s2, obtaining a protection potential value of a reference electrode corresponding to the tested offshore wind power pile foundation and an output current measured value in real time;
s3, judging whether the current acquired protection potential value is in the interval formed by the protection potential alarm upper/lower limit values, if so, executing S5, otherwise, executing S4;
s4, comparing the protection potential value with the protection potential alarm upper/lower limit value and determining the corresponding alarm operation, wherein the process of determining the corresponding alarm operation comprises the following steps: if the measured value of the protection potential is higher than the upper limit value of the protection potential alarm, enabling the impressed current cathodic protection system to carry out underprotection alarm operation and execute S5, and if the measured value of the protection potential is lower than the lower limit value of the protection potential alarm, enabling the impressed current cathodic protection system to carry out over protection alarm operation and execute S5;
s5, calculating the difference value between the protection potential value and the target potential;
s6, calculating a corresponding output current value based on the set increment PID regulation strategy, wherein the increment PID regulation strategy comprises: respectively calculating a proportional increment, an integral increment and a differential increment of the output current, and adjusting the potential difference value according to respective corresponding PID (proportion integration differentiation) adjustment parameters to calculate a corresponding output current value;
s7, judging whether the calculated output current value is in the interval formed by the upper limit value and the lower limit value of the output current, if so, outputting the output current value, and executing S8; if not, judging whether the output current value is larger than the output current upper limit value, if so, giving the output current upper limit value to the output current value, simultaneously enabling an impressed current cathode protection system to output a current high limit value output early warning and executing S9, otherwise, giving the output current lower limit value to the output current value, simultaneously enabling the impressed current cathode protection system to output a current low limit value output early warning and executing S9;
s8, carrying out iterative assignment on the difference value;
s9, judging whether the output current value reaches or exceeds the alarm current upper limit value, if so, enabling the impressed current cathodic protection system to output an overcurrent alarm and executing S10; otherwise, directly executing S10;
and S10, acquiring and judging whether the output voltage of the power supply reaches or exceeds the upper limit value of the alarm voltage, if so, enabling the impressed current cathodic protection system to output an overvoltage alarm and executing S2, otherwise, directly executing S2.
Optionally, in one embodiment, the incremental PID adjusting strategy includes: s61, calculating a proportional increment Δ cp (i) = Kp (e (i) = e (i-1)), and then adjusting a reduced potential difference e (i) according to a proportional coefficient Kp; s62, calculating an integral increment delta Ci (i) = Ki × e (i) of the output current, and adjusting and reducing the potential difference e (i) according to an integral coefficient Ki; s63, calculating the differential increment delta Cd (i) = Kd (e (i) -2 e (i-1) + e (i-2)), and adjusting the predicted potential difference value change rate according to the differential coefficient Kd; s64, calculating PID-adjusted output current increment Δ c (i) =Δcp (i) +Δci (i) +Δcd (i); the output current value C (i) =Δc (i) + C (i-1) is calculated at the same time.
In addition, in order to solve the defects in the prior art, the control system for improving the impressed current cathodic protection reliability of the offshore wind power pile foundation is also provided.
The utility model provides an improve control system of offshore wind power pile foundation impressed current cathodic protection reliability, control system is applied to in the impressed current cathodic protection system, its characterized in that includes:
the control parameter setting unit is used for determining corresponding control parameters in a constant potential operation mode, and the control parameters at least comprise a target potential, a protection potential alarm upper/lower limit value, an alarm current upper/lower limit value, an output current upper/lower limit value and PID (proportion integration differentiation) adjusting parameters;
the data acquisition unit can acquire a protection potential value of a reference electrode corresponding to the tested wind power pile and an output current measured value in real time;
the first judgment unit can judge whether the currently acquired protection potential value is located in an interval formed by the protection potential alarm upper/lower limit value, if so, the difference value of the protection potential value and the target potential is calculated, otherwise, the protection potential value is compared with the protection potential alarm upper/lower limit value, and the corresponding alarm operation is determined, wherein the process of determining the corresponding alarm operation comprises the following steps: if the measured value of the protection potential is higher than the upper limit value of the protection potential alarm, enabling the impressed current cathodic protection system to carry out under-protection alarm operation, and calculating the difference value between the protection potential value and the target potential;
a first calculation unit capable of calculating a corresponding output current value based on a set incremental PID adjustment strategy, wherein the incremental PID adjustment strategy comprises: respectively calculating the proportional increment, the integral increment and the differential increment of the output current, and adjusting the potential difference value according to respective corresponding PID (proportion integration differentiation) adjustment parameters to calculate the corresponding output current value;
a second judgment unit capable of judging whether the calculated output current value is within an interval formed by upper/lower limit values of the output current, if so, outputting the output current value, and performing iterative assignment on the difference value; if not, judging whether the output current value is larger than the output current upper limit value, if so, giving the output current upper limit value to the output current value, meanwhile, enabling an impressed current cathode protection system to output a current high limit value output early warning and execute a first control strategy, otherwise, giving the output current lower limit value to the output current value, and simultaneously enabling the impressed current cathode protection system to output a current low limit value output early warning and execute the first control strategy; the first control strategy comprises the steps of judging whether the output current value reaches or exceeds an alarm current upper limit value, if so, enabling an impressed current cathode protection system to output an overcurrent alarm and executing a second control strategy; otherwise, directly executing a second control strategy; and the second control strategy comprises the steps of obtaining and judging whether the power output voltage reaches or exceeds the upper limit value of the alarm voltage, if so, enabling the impressed current cathodic protection system to output overpressure alarm and informing the data acquisition unit to obtain the protection potential value and the output current measurement value of the reference electrode corresponding to the next offshore wind power pile foundation to be measured in real time, and otherwise, directly informing the data acquisition unit to obtain the protection potential value and the output current measurement value of the reference electrode corresponding to the next offshore wind power pile foundation to be measured in real time.
Optionally, in one embodiment, the incremental PID adjusting strategy includes: firstly, calculating a proportional increment delta Cp (i) = Kp (e (i) = e (i-1)), and then adjusting a reduction potential difference value e (i) according to a proportional coefficient Kp; secondly, calculating an integral increment delta Ci (i) = Ki × e (i) of the output current, and adjusting and reducing the potential difference value e (i) according to an integral coefficient Ki; thirdly, calculating the differential increment delta Cd (i) = Kd (e (i) -2 e (i-1) + e (i-2)), and adjusting and predicting the change rate of the potential difference value according to a differential coefficient Kd; finally, calculating the PID-regulated output current increment Δ C (i) =ΔCp (i) +ΔCi (i) +ΔCd (i); the output current value C (i) =Δc (i) + C (i-1) is calculated at the same time.
The embodiment of the invention has the following beneficial effects:
after the technology is adopted, the output reliability of the impressed current cathodic protection system under abnormal working conditions and fault working conditions can be obviously improved, and the impressed current cathodic protection system is suitable for the impressed current cathodic protection system of the offshore wind power underwater foundation which is unattended and distributed for a long time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a flow diagram illustrating core steps corresponding to the reliability control in one embodiment;
FIG. 2 is a flowchart illustrating steps of the reliability control method according to an embodiment;
FIG. 3 is a flowchart illustrating core steps for implementing an incremental PID tuning strategy in one embodiment;
FIG. 4 is a flowchart illustrating steps of a PID algorithm with constant potential current limiting function in the reliability control method according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application. The first and second elements are both elements, but they are not the same element.
In view of the defects of the prior art, an output control method of a constant potential instrument for an impressed current cathodic protection system needs to be developed in a targeted manner according to the characteristics of an underwater foundation structure form, ocean working conditions and long-term unattended operation of offshore wind power, the magnitude of output current is controlled and adjusted in a constant potential operation mode in real time, and meanwhile, system overrun output caused under abnormal working conditions such as extreme working conditions or potential measurement loop faults can be prevented, so that the reliability of the impressed current cathodic protection system of an offshore wind power pile foundation is improved.
Therefore, in this embodiment, a control method for improving reliability of impressed current cathodic protection of an offshore wind power pile foundation is especially provided, where the method can be directly applied to an existing impressed current cathodic protection system (the impressed current cathodic protection system has an underprotection alarm mode, an overvoltage alarm mode, a current high-limit output early-warning mode, a current low-limit output early-warning mode, an overcurrent alarm mode, an overpressure alarm mode, and the like), as shown in fig. 1 to 4, the method includes the following steps:
s1, determining corresponding control parameters in a constant potential operation mode, wherein the control parameters at least comprise a target potential, a protection potential alarm upper/lower limit value, an alarm current upper/lower limit value, an output current upper/lower limit value and PID (proportion integration differentiation) adjusting parameters;
s2, obtaining a protection potential value of a reference electrode corresponding to the tested wind power pile and an output current measurement value in real time;
s3, judging whether the current protection potential value MP (i) is in the interval formed by the protection potential alarm upper/lower limit value, namely ALP is less than or equal to MP (i) and AUP, if yes, executing S5, otherwise executing S4;
s4, comparing the protection potential value with the protection potential alarm upper/lower limit value and determining the corresponding alarm operation, wherein the process of determining the corresponding alarm operation comprises the following steps: if the protection potential measured value is higher than the protection potential alarm upper limit value, enabling the impressed current cathodic protection system to carry out underprotection alarm operation and executing S5, and if the protection potential measured value is lower than the protection potential alarm lower limit value, enabling the impressed current cathodic protection system to carry out over-protection alarm operation and executing S5;
s5, calculating the difference value between the protection potential value and the target potential;
s6, calculating a corresponding output current value based on the set increment PID regulation strategy, wherein the increment PID regulation strategy comprises: respectively calculating the proportional increment, the integral increment and the differential increment of the output current, and adjusting the potential difference value according to respective corresponding PID (proportion integration differentiation) adjustment parameters to calculate the corresponding output current value;
s7, judging whether the calculated output current value is in the interval formed by the upper limit value and the lower limit value of the output current, if so, outputting the output current value, and executing S8; if not, judging whether the output current value is larger than the output current upper limit value, if so, giving the output current upper limit value to the output current value, simultaneously enabling an impressed current cathode protection system to output a current high limit value output early warning and executing S9, otherwise, giving the output current lower limit value to the output current value, simultaneously enabling the impressed current cathode protection system to output a current low limit value output early warning and executing S9;
s8, iteratively assigning values to the difference values, namely, making e (i-1) = e (i), e (i-2) = e (i-1);
s9, judging whether the output current value C (i) reaches or exceeds an alarm current upper limit value AUC, if so, enabling the impressed current cathode protection system to output an overcurrent alarm and executing S10; otherwise, directly executing S10;
and S10, acquiring and judging whether the power output voltage V (i) reaches or exceeds the alarm voltage upper limit value AUV, if so, enabling the impressed current cathodic protection system to output an overpressure alarm and executing S2, otherwise, directly executing S2.
Based on the above, the scheme of the invention is a control method (namely a constant potential PID (proportion integration differentiation) adjusting method with a current limiting function) of a constant potential instrument for the cathodic protection of the underwater foundation impressed current of the offshore wind power, the corresponding gain function of the invention is to combine the advantages of the constant potential and constant current control methods, under the normal protection state, the system outputs in a constant potential operation mode, when the system encounters extreme working conditions or the reference electrode which is controlled by the system fails, the system is automatically switched to a constant current mode to set the upper limit value and the lower limit value of the output current for outputting, so as to prevent the over-protection or under-protection of the protected structure caused by the over-limit output of the impressed current cathodic protection system under the extreme abnormal working condition, and the coating or the structural matrix is irreversibly damaged, so that the operation reliability of the impressed current cathodic protection system is improved. The control of the constant potential operation mode refers to that the upper limit and the lower limit of the protection current are determined through design, the potentiostat outputs in a constant potential output mode in the upper limit interval and the lower limit interval of the designed protection current, namely, the output current is subjected to increment PID adjustment based on a closed-loop control strategy according to the difference value between the measured potential of the main control reference electrode and the set given potential in a current limiting interval in real time, and compared with the existing commonly adopted difference value comparison algorithm, the stability of the structural protection potential in the constant potential operation mode is improved; meanwhile, the output current of the numerical control high-frequency switching power supply can be controlled in real time through technologies such as PWM modulation, when the output protection current exceeds a protection current output limit interval, the constant potential control mode is automatically switched to a constant current control mode, and constant current output is carried out according to the set upper limit and lower limit of the output current.
In some specific embodiments, in the S1: in the constant potential operation mode, a user sets a target potential GP (I), a protection potential alarm upper limit AUP, a protection potential alarm lower limit ALP, an alarm current upper limit AUC, an alarm voltage upper limit AUV and an output current upper limit I which are controlled by the constant potential in the system up And the lower limit value I of the output current low (ii) a Wherein the output current upper limit value I up And a lower limit value I of the output current low Setting a proportion coefficient K regulated by PID according to the output current condition in the design and initial engineering debugging period based on the work experience and engineering requirements of a user p Differential coefficient K i And integral coefficient K d Based on the protected structure characteristic setting, different reference electrodes are used for cathodic protection potential measurement, and the potential measurement intervals of the different reference electrodes are different. If the protective potential interval is-0.80V-1.05V relative to the silver/silver chloride seawater reference electrode, if the protective potential interval is + 0.25V-0V relative to the high-purity zinc reference electrode, the protective potential interval needs to be set according to specific conditions;
in some specific embodiments, in S2: the impressed current cathodic protection system reads a protection potential value MP (i) measured by the reference electrode and an output current measured value C (i) through the acquisition module;
in some specific embodiments, in the S4: comparing the protection potential value with a protection potential alarm upper/lower limit value and determining corresponding alarm operation, wherein the process of determining the corresponding alarm operation comprises the following steps: if the measured value of the protection potential is higher than (or called as positive) the alarm upper limit value of the protection potential, such as MP (i) > AUP, the impressed current cathodic protection system is enabled to carry out an under-protection alarm mode and S5 is executed, and if the measured value of the protection potential is lower than (or called as negative) the alarm lower limit value of the protection potential, such as MP (i) < ALP, the impressed current cathodic protection system is enabled to carry out an over-protection alarm operation and S5 is executed;
in some specific embodiments, in the S5: calculating a difference e (i) between the protection potential value and the target potential, i.e. e (i) = mp (i) -gp (i);
in some specific embodiments, in the S6: calculating a corresponding output current value based on the set increment PID regulation strategy, wherein the increment PID regulation strategy comprises the following steps: respectively calculating the proportional increment, the integral increment and the differential increment of the output current, and adjusting the potential difference value according to respective corresponding PID (proportion integration differentiation) adjustment parameters to calculate the corresponding output current value; the incremental PID adjustment strategy comprises: s61, calculating a proportional increment Δ cp (i) = Kp (e (i) = e (i-1)), and adjusting the reduced potential difference e (i) according to a proportional coefficient Kp (i.e. P); s62, calculating an integral increment delta Ci (I) = Ki × e (I) of the output current, and adjusting the reduced potential difference e (I) according to an integral coefficient Ki, namely I; s63, calculating the differential increment delta Cd (i) = Kd (e (i) -2 e (i-1) + e (i-2)), and adjusting the predicted potential difference value change rate according to a differential coefficient Kd (D adjustment); s64, calculating PID-adjusted output current increment Δ c (i) =Δcp (i) +Δci (i) +Δcd (i); the output current value C (i) =Δc (i) + C (i-1) is calculated at the same time.
In some specific embodiments, in the S7: judging whether the calculated output current value C (I) is in the interval formed by the upper/lower limit values of the output current, i.e. I low ＜C(i)＜I up Outputting the output current value as C (i) = Δ C (i) + C (i-1), and executing S8; if the output current value C (i) is not within the range of the set upper and lower limits of the output current, the following cases are distinguished: if the output current value is not in the interval formed by the upper limit value and the lower limit value of the output current, judging whether the output current value C (I) is larger than the upper limit value I of the output current up If so, the upper limit value of the output current is given to the output current value, namely C (I) = I up Simultaneously enabling the impressed current cathodic protection system to output a current high limit output early warning and executing S9 if C (I) is not more than I up If the output current lower limit value is given to the output current value, then C (I) = I low Simultaneously enabling the impressed current cathodic protection system to output a current low limit value output early warning and executing S9;
based on the same inventive concept, the invention also provides a control system for improving impressed current cathodic protection reliability of the offshore wind power pile foundation, which is applied to an impressed current cathodic protection system (the impressed current cathodic protection system has an underprotection alarm mode, an overprotection alarm mode, a current high-limit output early-warning mode, a current low-limit output early-warning mode, an overcurrent alarm mode, an overpressure alarm mode and the like), and is characterized by comprising the following steps:
the control parameter setting unit is used for determining corresponding control parameters in a constant potential operation mode, and the control parameters at least comprise a target potential, a protection potential alarm upper/lower limit value, an alarm current upper/lower limit value, an output current upper/lower limit value and PID (proportion integration differentiation) adjusting parameters;
the data acquisition unit can acquire a protection potential value and an output current measurement value of a reference electrode corresponding to the measured offshore wind power pile foundation in real time;
the first judgment unit can judge whether the currently acquired protection potential value is located in an interval formed by the protection potential alarm upper/lower limit values, if yes, the difference value between the protection potential value and the target potential is calculated, otherwise, the protection potential value is compared with the protection potential alarm upper/lower limit values, and corresponding alarm operation is determined, wherein the process of determining the corresponding alarm operation comprises the following steps: if the measured value of the protection potential is higher than the upper limit value of the protection potential alarm, enabling the impressed current cathodic protection system to carry out under-protection alarm and calculate the difference value between the protection potential value and the target potential, and if the measured value of the protection potential is lower than the lower limit value of the protection potential alarm, enabling the impressed current cathodic protection system to carry out over-protection alarm and calculate the difference value between the protection potential value and the target potential;
a first calculation unit capable of calculating a corresponding output current value based on a set incremental PID adjustment strategy, wherein the incremental PID adjustment strategy comprises: respectively calculating the proportional increment, the integral increment and the differential increment of the output current, and adjusting the potential difference value according to respective corresponding PID (proportion integration differentiation) adjustment parameters to calculate the corresponding output current value; the incremental PID adjustment strategy comprises: firstly, calculating a proportional increment delta Cp (i) = Kp (e (i) = e (i-1)), and then adjusting a reduction potential difference value e (i) according to a proportional coefficient Kp; secondly, calculating an integral increment delta Ci (i) = Ki × e (i) of the output current, and adjusting and reducing the potential difference value e (i) according to an integral coefficient Ki; thirdly, calculating the differential increment delta Cd (i) = Kd (e (i) -2 e (i-1) + e (i-2)), and adjusting and predicting the change rate of the potential difference value according to a differential coefficient Kd; finally, calculating the PID-regulated output current increment Δ C (i) =ΔCp (i) +ΔCi (i) +ΔCd (i); simultaneously calculating an output current value C (i) = [ Delta ] C (i) + C (i-1);
a second judgment unit capable of judging whether the calculated output current value is within an interval formed by upper/lower limit values of the output current, if so, outputting the output current value, and performing iterative assignment on the difference value; if not, judging whether the output current value is larger than the output current upper limit value, if so, giving the output current upper limit value to the output current value, meanwhile, enabling an impressed current cathode protection system to output a current high limit value output early warning and execute a first control strategy, otherwise, giving the output current lower limit value to the output current value, and simultaneously enabling the impressed current cathode protection system to output a current low limit value output early warning and execute the first control strategy; the first control strategy comprises the steps of judging whether the output current value reaches or exceeds an alarm current upper limit value, if so, enabling an impressed current cathode protection system to output an overcurrent alarm and executing a second control strategy; otherwise, directly executing a second control strategy; and the second control strategy comprises the steps of obtaining and judging whether the power output voltage reaches or exceeds the upper limit value of the alarm voltage, if so, enabling the impressed current cathodic protection system to output overpressure alarm and informing the data acquisition unit to obtain the protection potential value and the output current measurement value of the reference electrode corresponding to the next offshore wind power pile foundation to be measured in real time, and otherwise, directly informing the data acquisition unit to obtain the protection potential value and the output current measurement value of the reference electrode corresponding to the next offshore wind power pile foundation to be measured in real time.
Based on the same inventive concept, the present invention also provides a computer-readable storage medium, which comprises computer instructions that, when executed on a computer, cause the computer to execute the reliability control method.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (2)
1. A control method for improving impressed current cathodic protection reliability of an offshore wind power pile foundation is applied to an impressed current cathodic protection system and is characterized by comprising the following steps of:
s1, determining corresponding control parameters in a constant potential operation mode, wherein the control parameters at least comprise a target potential, a protection potential alarm upper/lower limit value, an alarm current upper/lower limit value, an output current upper/lower limit value and PID (proportion integration differentiation) adjusting parameters;
s2, obtaining a protection potential value of a reference electrode corresponding to the tested offshore wind power pile foundation and an output current measured value in real time;
s3, judging whether the current acquired protection potential value is in the interval formed by the protection potential alarm upper/lower limit values, if so, executing S5, otherwise, executing S4;
s4, comparing the protection potential value with the protection potential alarm upper/lower limit value and determining the corresponding alarm operation, wherein the process of determining the corresponding alarm operation comprises the following steps: if the protection potential measured value is higher than the protection potential alarm upper limit value, enabling the impressed current cathodic protection system to carry out underprotection alarm operation and execute S5, and if the protection potential measured value is lower than the protection potential alarm lower limit value, enabling the impressed current cathodic protection system to carry out over protection alarm operation and execute S5;
s5, calculating the difference value between the protection potential value and the target potential;
s6, calculating the corresponding output current value based on the set increment PID regulation strategy, wherein the increment PID regulation strategy comprises the following steps: respectively calculating the proportional increment, the integral increment and the differential increment of the output current, and adjusting the potential difference value according to respective corresponding PID (proportion integration differentiation) adjustment parameters to calculate the corresponding output current value;
s7, judging whether the calculated output current value is in the interval formed by the upper/lower limit values of the output current, if so, outputting the output current value, and executing S8; if not, judging whether the output current value is larger than the output current upper limit value, if so, giving the output current upper limit value to the output current value, simultaneously enabling an impressed current cathode protection system to output a current high limit value output early warning and executing S9, otherwise, giving the output current lower limit value to the output current value, simultaneously enabling the impressed current cathode protection system to output a current low limit value output early warning and executing S9;
s8, carrying out iterative assignment on the difference value;
s9, judging whether the output current value reaches or exceeds the alarm current upper limit value, if so, enabling the impressed current cathodic protection system to output an overcurrent alarm and executing S10; otherwise, directly executing S10;
s10, acquiring and judging whether the output voltage of the power supply reaches or exceeds the upper limit value of the alarm voltage, if so, enabling the impressed current cathodic protection system to output an overvoltage alarm and executing S2, otherwise, directly executing S2; wherein said S6 includes
The incremental PID adjustment strategy comprises: s61, calculating a proportional increment Δ cp (i) = Kp (e (i) = e (i-1)), and then adjusting a reduced potential difference e (i) according to a proportional coefficient Kp; s62, calculating an integral increment delta Ci (i) = Ki × e (i) of the output current, and adjusting and reducing the potential difference e (i) according to an integral coefficient Ki; s63, calculating the differential increment delta Cd (i) = Kd (e (i) -2 e (i-1) + e (i-2)), and adjusting the predicted potential difference value change rate according to the differential coefficient Kd; s64, calculating PID-adjusted output current increment Δ c (i) =Δcp (i) +Δci (i) +Δcd (i); the output current value C (i) =Δc (i) + C (i-1) is calculated at the same time.
2. The utility model provides an improve control system of offshore wind power pile foundation impressed current cathodic protection reliability, control system is applied to in the impressed current cathodic protection system, its characterized in that includes:
the control parameter setting unit is used for determining corresponding control parameters in a constant potential operation mode, and the control parameters at least comprise a target potential, a protection potential alarm upper/lower limit value, an alarm current upper/lower limit value, an output current upper/lower limit value and PID (proportion integration differentiation) adjusting parameters;
the data acquisition unit can acquire a protection potential value and an output current measurement value of a reference electrode corresponding to the measured offshore wind power pile foundation in real time;
the first judgment unit can judge whether the currently acquired protection potential value is located in an interval formed by the protection potential alarm upper/lower limit value, if so, the difference value of the protection potential value and the target potential is calculated, otherwise, the protection potential value is compared with the protection potential alarm upper/lower limit value, and the corresponding alarm operation is determined, wherein the process of determining the corresponding alarm operation comprises the following steps: if the protection potential measured value is higher than the protection potential alarm upper limit value, enabling the impressed current cathodic protection system to carry out underprotection alarm operation and calculating the difference value between the protection potential value and the target potential, and if the protection potential measured value is lower than the protection potential alarm lower limit value, enabling the impressed current cathodic protection system to carry out over-protection alarm operation and calculating the difference value between the protection potential value and the target potential;
a first calculation unit capable of calculating a corresponding output current value based on a set incremental PID adjustment strategy, wherein the incremental PID adjustment strategy comprises: respectively calculating a proportional increment, an integral increment and a differential increment of the output current, and adjusting the potential difference value according to respective corresponding PID (proportion integration differentiation) adjustment parameters to calculate a corresponding output current value;
a second judgment unit capable of judging whether the calculated output current value is within an interval formed by an output current upper/lower limit value, if so, outputting the output current value, and performing iterative assignment on the difference value; if not, judging whether the output current value is larger than the output current upper limit value, if so, giving the output current upper limit value to the output current value, simultaneously enabling an impressed current cathode protection system to output a current high limit value output early warning and execute a first control strategy, otherwise, giving the output current lower limit value to the output current value, simultaneously enabling the impressed current cathode protection system to output a current low limit value output early warning and execute the first control strategy; the first control strategy comprises the steps of judging whether the output current value reaches or exceeds an alarm current upper limit value, if so, enabling an impressed current cathode protection system to output an overcurrent alarm and executing a second control strategy; otherwise, directly executing a second control strategy; the second control strategy comprises the steps of obtaining and judging whether the power output voltage reaches or exceeds the upper limit value of the alarm voltage, if so, enabling the impressed current cathodic protection system to output overpressure alarm and informing the data acquisition unit to obtain the protection potential value and the output current measurement value of the reference electrode corresponding to the next offshore wind power pile foundation to be measured in real time, and otherwise, directly informing the data acquisition unit to obtain the protection potential value and the output current measurement value of the reference electrode corresponding to the next offshore wind power pile foundation to be measured in real time; wherein the incremental PID adjustment strategy comprises: firstly, calculating a proportional increment delta Cp (i) = Kp (e (i) = e (i-1)), and then adjusting a reduction potential difference value e (i) according to a proportional coefficient Kp; secondly, calculating an integral increment delta Ci (i) = Ki × e (i) of the output current, and adjusting and reducing the potential difference value e (i) according to an integral coefficient Ki; thirdly, calculating the differential increment delta Cd (i) = Kd (e (i) -2 e (i-1) + e (i-2)), and adjusting and predicting the change rate of the potential difference value according to a differential coefficient Kd; finally, calculating the PID-regulated output current increment Δ C (i) =ΔCp (i) +ΔCi (i) +ΔCd (i); the output current value C (i) =Δc (i) + C (i-1) is calculated at the same time.
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Address after: 116000 Miao Ling Village, Lingshui Town, Ganjingzi District, Dalian City, Liaoning Province Patentee after: Dalian Komeier Marine Technology Co.,Ltd. Patentee after: CHINA NUCLEAR POWER DESIGN COMPANY Ltd. (SHENZHEN) Address before: 116000 room 1008, TAD building, 537 Huangpu Road, hi tech park, Dalian, Liaoning Patentee before: DALIAN KINGMILE ANTICORROSION TECHNOLOGY Co.,Ltd. Patentee before: CHINA NUCLEAR POWER DESIGN COMPANY Ltd. (SHENZHEN) |
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Effective date of registration: 20231024 Address after: 116000 Miao Ling Village, Lingshui Town, Ganjingzi District, Dalian City, Liaoning Province Patentee after: Dalian Komeier Marine Technology Co.,Ltd. Patentee after: CHINA NUCLEAR POWER DESIGN COMPANY Ltd. (SHENZHEN) Patentee after: Advanced energy science and technology Guangdong laboratory Shanwei sub center Address before: 116000 Miao Ling Village, Lingshui Town, Ganjingzi District, Dalian City, Liaoning Province Patentee before: Dalian Komeier Marine Technology Co.,Ltd. Patentee before: CHINA NUCLEAR POWER DESIGN COMPANY Ltd. (SHENZHEN) |