Marine intelligent switch constant potential control system and control method

Abstract

The invention provides a marine intelligent switch constant potential control system and method, and belongs to the technical field of marine constant potentials, and the system comprises a circuit breaker, an EMC filter, a plurality of potentiostat modules, an industrial computer, two reference electrodes, a remote control center, and a plurality of auxiliary anodes in one-to-one correspondence with the potentiostat modules. The system has local control and remote control functions, under local control, a protection potential or an output current is set through an industrial computer, and the system performs intelligent control to realize constant potential; in the remote control mode, the remote control center can issue an output voltage or output current setting instruction to realize a constant potential function through a CAN communication, LAN communication or wireless communication remote control system. By means of the system, the ship can easily reach the constant potential, and the antifouling and anti-corrosion functions of cathode protection are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine constant potential technology, and particularly to a marine intelligent switch constant potential control system and a control method thereof. Background Art

[0002] In the early days, ships used physical means such as painting on the hull surface for anti-fouling and anti-corrosion. After long-term navigation, the outer surface of the ship's hull was corroded by seawater, and a lot of marine organisms adhered to it. Maintenance was time-consuming and laborious. The marine intelligent switch constant potential control system is an anti-fouling and anti-corrosion device that uses the electrochemical principle to cathodically protect the hull. Cathodic protection technology is a recognized effective technology for controlling external corrosion. A reasonable cathodic protection design will effectively extend the service life of the ship and reduce maintenance costs. The principle of realizing cathodic protection of the ship is to sample the potential value of the hull through a reference electrode. The negative output of the constant potential instrument module is connected to the hull, and the positive output of the constant potential instrument module is connected to the auxiliary anode. A circuit is formed through seawater, and the output of the constant potential instrument module is controlled to enable the hull to achieve cathodic protection.

[0003] The constant potential control system, the hull, seawater, etc. form a complex non-linear system. Most of the existing constant potential instruments use analog control technology and traditional PID control, with insufficient control accuracy and poor anti-interference ability, showing deficiencies in complex non-linear systems.

[0004] Most of the existing constant potential instruments adopt a non-modular design. The system consists of multiple components, which brings the disadvantages of large volume and heavy weight, and to a certain extent does not meet the application requirements of modern ships.

[0005] In addition, the existing constant potential instruments use a one-to-one method of reference electrode and auxiliary anode to control and realize the constant potential function. The advantage of this scheme is simple control, but for large ships, this method requires multiple reference electrodes, which increases the operation difficulty in each stage from the pre-installation, commissioning to the later calibration, maintenance, and upgrade of the product, and at the same time, the cost is very high, lacking competitiveness in the market.

[0006] In summary, there is an urgent need for a new type of marine intelligent switch constant potential control system and a control method to meet the requirements of the development of modern ships. Summary of the Invention

[0007] The present invention provides a marine intelligent switch constant potential control system and a control method. One objective is to provide an intelligent switch constant potential control system with modular design and digital control to meet the application requirements of modern ships for high precision, miniaturization, and modularization. Another objective is to reduce the operation difficulty and cost of the marine constant potential control system. This system adopts an intelligent digital control method, which reduces the number of reference electrodes. The number of reference electrodes does not have to be the same as the number of auxiliary anodes used, and it can meet the marine application scenarios where two reference electrodes correspond to multiple auxiliary anodes. The two reference electrodes adopted are respectively placed at the bow and stern of the hull. Since the potential of the stern with a propeller is different from that of the bow, at least two reference electrodes are required. This system has local control and remote control functions, can realize multiple output functions such as constant potential output, constant current output, and constant voltage output, and at the same time reduces the number of reference electrodes. In addition, the control method adopts an optimized BP neural network PID control algorithm. Compared with the traditional PID control algorithm, the BP neural network PID algorithm has the capabilities of self-learning and self-adaptation, and can also resist interference, making the control performance of the constant potentiometer reach the optimal level.

[0008] In the first aspect, the present invention provides a marine intelligent switch constant potential control system, including:

[0009] A circuit breaker, an EMC filter, multiple constant potentiometer modules, an industrial computer, two reference electrodes, a remote control center, and multiple auxiliary anodes corresponding to the constant potentiometer modules one by one; the circuit breaker is connected in series between the three-phase AC source and the EMC filter for controlling the power on and off of the system; the EMC filter is connected to the industrial computer and multiple parallel constant potentiometer modules for realizing the electromagnetic compatibility function of the system; the output positive pole of each constant potentiometer module is connected to the corresponding auxiliary anode, the negative pole of each constant potentiometer module is connected to the hull, and the two reference electrodes of the system are connected to two of the constant potentiometer modules one by one; the input of the constant potentiometer module is three-phase alternating current, and the output is direct current voltage; the industrial computer and all the constant potentiometer modules are connected in parallel to the first bus, the industrial computer and the remote control center are connected in parallel to the second bus, and the industrial computer is communicatively connected to the remote control center; the industrial computer is also used for obtaining the status information reported by each constant potentiometer module and controlling the output of the constant potentiometer module; the status information includes: input voltage information, input current information, output voltage information, output current information, temperature information, and two-way reference potential information.

[0010] According to the marine intelligent switch constant potential control system provided by the present invention, the system adopts modular design, and the output current of each constant potentiometer module is within a preset current range, and the output voltage of each constant potentiometer module is within a preset voltage range.

[0011] A marine intelligent switch constant potential control system provided by the present invention is based on digital control technology. Under the control of an industrial computer, the potentiostat module realizes the output of constant potential, constant current, and constant voltage; moreover, each potentiostat module has a unique identity identifier.

[0012] A marine intelligent switch constant potential control system provided by the present invention, the industrial computer has a display module, which has CAN communication, LAN communication, wireless communication functions, and artificial intelligence voice control functions.

[0013] A marine intelligent switch constant potential control system provided by the present invention, the industrial computer obtains the status information reported by the potentiostat module through CAN communication between the industrial computer and the potentiostat module, analyzes the status information, and displays it on the display module; the industrial computer is also used to set the working parameter information of the potentiostat module; the working parameter information includes: protection potential information, output current information, and output voltage information.

[0014] A marine intelligent switch constant potential control system provided by the present invention, the display module is a touchable liquid crystal display screen.

[0015] In a second aspect, the present invention also provides a control method for a marine intelligent switch constant potential control system, which is characterized in that it is applied to the intelligent switch constant potential control system as described above. The control loop of the potentiostat module is composed of a potential loop, a voltage loop, and a current loop. The potential loop and the voltage loop are connected in series and then connected in parallel with the current loop; the control method includes:

[0016] Constant potential control in the local control mode:

[0017] Turn the local / remote control switches of all potentiostat modules to local. After the system is powered on, it works in the local control mode. The potentiostat module samples the reference potential of the reference electrode and reports it to the industrial computer, and sets the constant potential setting value on the industrial computer;

[0018] The potentiostat module receives the constant potential setting value and uses the potential loop to realize constant potential control: taking the normalized constant potential setting value Vref_g, the error value evref between the reference potential ADVref and Vref_g as the input of the first BP neural network, and obtaining the PID parameters of the first PID controller through BP neural network algorithm operation; the g_vo after the operation of the first PID controller is used as the input of the voltage loop. After PID operation of g_vo and the voltage sampling value ADVVo, the value u1 is obtained. The smaller value between the value u1 and the output value u2 of the current loop is taken as the value uo. The value uo acts on the potentiostat module to form a closed-loop control, so that the reference potential value follows the constant potential setting value.

[0019] A constant potential control method for a marine intelligent switch provided by the present invention further includes:

[0020] Constant current control in the local control mode:

[0021] Turn the local / remote control switch of all potentiostat modules to local. After the system is powered on, it works in the local control mode. Set the output current and the output current ratio of each potentiostat on the industrial computer, and the set values will be distributed to each potentiostat module according to the ratio.

[0022] After the potentiostat module receives the output current set value, it uses the current loop to achieve constant current control: Take the normalized current set value Io_g, the error value eio between Io_g and the output current sampled value ADIo as the input of the third BP neural network. After the BP neural network algorithm operation, obtain the PID parameters of the third PID controller. The output value u2 of the third PID controller is taken as the smaller value with the output value u1 of the voltage loop to obtain the value uo. The value uo acts on the potentiostat module to form a closed-loop control, so that the actual output current follows the output current set value.

[0023] A constant potential control method for a marine intelligent switch provided by the present invention further includes:

[0024] Constant current control in the remote control mode:

[0025] Turn the local / remote control switch of all potentiostat modules to remote. After the system is powered on, it works in the remote control mode. The output current set value and the output current ratio of each potentiostat are issued from the remote control center. After the industrial computer receives the instruction, it distributes the set values to each potentiostat module according to the ratio.

[0026] After the potentiostat module receives the output current set value, it uses the current loop to achieve constant current control: Take the normalized current set value Io_g, the error value eio between Io_g and the output current sampled value ADIo as the input of the third BP neural network. After the BP neural network algorithm operation, obtain the PID parameters of the third PID controller. The output value u2 of the third PID controller is taken as the smaller value with the output value u1 of the voltage loop to obtain the value uo. The value uo acts on the potentiostat module to form a closed-loop control, so that the actual output current follows the output current set value.

[0027] A constant potential control method for a marine intelligent switch provided by the present invention further includes:

[0028] Constant voltage control in the remote control mode:

[0029] Switch the local / remote control switches of all potentiostat modules to remote control. After the system is powered on, it works in the remote control mode. Set the constant voltage setting value at the remote control center. After receiving the instruction, the industrial computer distributes the constant voltage setting value to each potentiostat module respectively.

[0030] After receiving the constant voltage setting instruction, the potentiostat module assigns the input of the potential loop to the preset value to ensure that the potential loop does not function. After normalizing the constant voltage setting value, it is assigned to g_vo. The error value evo between g_vo and the voltage sampling value ADvo is used as the input of the second PID controller for calculation. The calculation result value u1 is compared with the current loop output value u2, and the smaller value is taken to obtain the value uo. The value uo acts on the potentiostat module for closed-loop control, so that the actual output voltage follows the constant voltage setting value.

[0031] The marine intelligent switch potentiostat control system and control method provided by the present invention have the following beneficial effects compared with the prior art:

[0032] (1) The control system of the present invention is modularly designed, and the system integration can be flexibly carried out according to the actual needs of users. The potentiostat modules support multiple parallel connections. The modular design of the control system can shorten the development time, reduce the maintenance cost and difficulty, and can meet the needs of different ships. At the same time, it can also effectively reduce the volume and weight of the system.

[0033] (2) In the control mode of the present invention, the control system adopts digital control and has two modes: local control and remote control. In the local control mode, the potentiostat module samples the potential on the reference electrode in real time and reports it to the industrial computer. The protection potential value is set using the digital keyboard or voice control on the industrial computer. After the setting is completed, the industrial computer sends the protection potential to the potentiostat module. The potentiostat module performs loop operation to control the output to make the reference potential sampling value follow the protection potential value. Finally, when the error between the set value and the sampling value is less than 5 mV, the stable output is maintained to achieve the effect of constant potential and provide cathodic protection for the hull. The control system also supports constant current output in the local control mode, that is, constant potential is achieved by manually setting constant current control. The specific implementation method is to set the total output current of the control system through the industrial computer. The industrial computer distributes the current setting value to each potentiostat module according to a ratio. The potentiostat module controls the actual output current to follow the set current through loop operation. After the two reach balance, the potentiostat module outputs stably, and the reference electrode potential is adjusted to approach the desired constant potential effect by manually controlling the output current. This method is a supplement to the constant potential control.

[0034] In the remote control mode, the system can output constant current or constant voltage. The remote control center can first select constant current operation or constant voltage operation, and then send the set output current value or protection voltage value according to the corresponding mode. The remote control center can choose to send the setting instruction to the industrial computer through any one of the three methods: CAN bus, LAN communication or wireless communication. After receiving the setting instruction, the industrial computer sends it to the potentiostat module, and the potentiostat module responds to the setting instruction to perform closed-loop control output, realizing the constant voltage or constant current function.

[0035] Compared with the potentiostat with a single control method or the analog control potentiostat, the control method of the present invention is richer and more intelligent, and can better meet the requirements of hull cathodic protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 It is a schematic structural diagram of a marine intelligent switch potentiostat control system provided by the present invention;

[0038] Figure 2 It is a principle block diagram of the control method of the marine intelligent switch potentiostat control system provided by the present invention;

[0039] Figure 3 It is one of the schematic diagrams of the control interface of the industrial computer provided by the present invention;

[0040] Figure 4 It is the second schematic diagram of the control interface of the industrial computer provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0042] It should be noted that in the description of the embodiments of the present invention, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation of the present invention. Unless otherwise expressly specified and defined, the terms "mount", "connect", "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The terms "first", "second", etc. in this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0044] Embodiment 1:

[0045] Figure 1 is a schematic structural diagram of a marine intelligent switch constant potential control system provided by the present invention, as Figure 1As shown in the figure, the system includes: a circuit breaker, an EMC filter, a potentiostat module 1, a potentiostat module 2, a potentiostat module 3, a potentiostat module 4, a potentiostat module 5, a potentiostat module 6, an industrial computer, a reference electrode 1, a reference electrode 2, a remote control center, an auxiliary anode 1, an auxiliary anode 2, an auxiliary anode 3, an auxiliary anode 4, an auxiliary anode 5, and an auxiliary anode 6; the circuit breaker is connected in series between a three-phase AC source and the EMC filter, the EMC filter is connected to the industrial computer and multiple parallel potentiostat modules, the positive output of each potentiostat module is connected to the corresponding auxiliary anode, and the negative pole of each potentiostat module is connected to the hull to form a loop through seawater; the reference electrode 1 is connected to the potentiostat module 1, and the system reference electrode 2 is connected to the potentiostat module 4; the CAN communication lines of the potentiostat module 1, the potentiostat module 2, the potentiostat module 3, the potentiostat module 4, the potentiostat module 5, the potentiostat module 6, and the industrial computer are connected in parallel to the CAN bus 1, the CAN communication lines of the industrial computer and the remote control center are connected in parallel to the CAN bus 2, and the LAN communication line of the industrial computer is connected to the remote control center.

[0046] The circuit breaker is used to control the power on and off of the system; the EMC filter is used to achieve the electromagnetic compatibility function of the system; the potentiostat module converts the input three-phase alternating current into the required DC voltage; the industrial computer is the operation center of the system, which can display the status information such as the input voltage, input current, output voltage, output current, reference potential, and internal temperature reported by each potentiostat module in real time. At the same time, the protection potential value or output current and output voltage can be set on the industrial computer to control the output of the potentiostat module. Connecting to the CAN bus 2 of the remote control center can achieve CAN communication, wireless communication, and LAN communication, and receive instructions from the remote control center to control the output of the potentiostat module.

[0047] The marine intelligent switch potentiostat control system of the present invention is composed of a circuit breaker, an EMC filter, X potentiostat modules (X is an integer greater than or equal to 1), an industrial computer, 2 reference electrodes, a remote control center, and Y auxiliary anodes (Y is an integer greater than or equal to 1). By setting the protection potential value on the industrial computer, the reference electrode signal sampling circuit of the potentiostat module performs differential sampling to obtain an accurate reference potential sampling value. The DSP control circuit performs a BP neural network PID control algorithm loop operation on the reference potential sampling value and the protection potential value, and then outputs a phase shift angle control signal to control the output of the potentiostat module to achieve the potentiostatic control function; at the same time, the remote monitoring center can remotely monitor the operating conditions of the control system and the real-time potentiostatic parameters, and the remote control center can issue setting instructions to adjust the output of the control system, realizing local unattended operation and remote monitoring, which is convenient for system operation and maintenance.

[0048] In this embodiment, the reference electrode 1 and the reference electrode 2 are suspended in seawater to form a reference potential with the hull. The reference electrode sampling circuits of the potentiostat module 1 and the potentiostat module 4 perform differential sampling on the reference potential. The theoretical sampling accuracy of the reference potential can reach 0.36 mV, and the actual control accuracy can reach 5 mV. At the same time, the industrial computer monitors the reference potential of the hull in real time. When the ship sails to different sea areas and the environmental changes cause the reference potential to change, the control system of the present invention can automatically control the output to ensure constant potential output, effectively realizing the cathodic protection of the hull.

[0049] In this embodiment, it is more in line with the actual application scenario of the ship to select 2 reference electrodes, which are respectively placed in the bow area and the stern area of the hull, which can effectively reduce the difficulty and cost of installation, debugging and maintenance.

[0050] Optionally, the intelligent switch constant potential control system provided by the present invention adopts a modular design. The output current range of each potentiostat module is set to be adjustable from 0 to 100 A, and the output voltage range is set to be adjustable from 0 to 20 V. The maximum output current of the intelligent switch constant potential control system is equal to the number of potentiostat modules multiplied by 100 A, and the output voltage range is 0 to 20 V.

[0051] Optionally, the potentiostat module is composed of a three-phase power factor correction circuit, a reference electrode sampling circuit, a phase-shifted full-bridge circuit, a DSP control circuit, a signal sampling circuit, a CAN communication circuit, and an auxiliary source circuit. The potentiostat module adopts digital control technology and can realize constant potential, constant current and constant voltage output control. Each module has a unique identity identifier (such as an ID number). The potentiostat module communicates with the industrial computer and actively reports status information such as input voltage, input current, output voltage, output current, temperature, reference potential, and working status.

[0052] Optionally, the industrial computer has an artificial intelligence voice control function, and can realize intelligent operation through voice, realizing functions such as information broadcast, fault alarm and parameter setting; the industrial computer adopts a display module (for example, a touch screen liquid crystal screen), adopts a domestic operating system, and has CAN communication, LAN communication, wireless communication functions, and artificial intelligence voice control functions. It communicates with the potentiostat module through CAN, obtains the status information reported by the module and displays it on the screen of the industrial computer. Through the industrial computer, parameters such as the protection potential, output current, and output voltage of the system can be set, and the power on and off can also be controlled.

[0053] The input voltage of the potentiostat module is 380Vac ± 20% / 50Hz ± 10%, the output voltage range is adjustable from 0 to 20Vdc, and the output current range is adjustable from 0 to 100A; the potentiostat module adopts digital control, with a three-phase power factor correction circuit and a phase-shifted full-bridge circuit. The two DSP controllers used in the DSP control circuit are of the ADP32F035 series, equipped with a 12-bit high-precision ADC. Combining with the reference electrode sampling circuit, the sampling accuracy can reach 0.36mV theoretically. It has constant current, constant potential, and constant current output functions. CAN communication with the industrial computer can display information such as input voltage, input current, output voltage, output current, reference potential, internal temperature, and working status in real time. Clicking the buttons on the industrial computer screen or voice control can perform parameter settings and on / off control on the potentiostat module; this system has a self-diagnosis function and a health management system, making the system more intelligent and reducing the difficulty of use and maintenance.

[0054] Embodiment 2:

[0055] Figure 2 It is the principle block diagram of the control method of the marine intelligent switch potentiostat control system provided by the present invention. The control loop of the potentiostat module consists of a potential loop, a voltage loop, and a current loop. The potential loop and the voltage loop are connected in series and then connected in parallel with the current loop.

[0056] The control method includes:

[0057] (1) Potentiostat control in the local control mode:

[0058] Turn the local / remote control switches of all potentiostat modules to local. After the system is powered on, it works in the local control mode. The potentiostat module samples the reference potential of the reference electrode and reports it to the industrial computer, and sets the potentiostat setting value on the industrial computer.

[0059] The potentiostat module receives the potentiostat setting value and realizes potentiostat control using the potential loop: taking the normalized potentiostat setting value Vref_g and the error value evref between the reference potential ADVref and Vref_g as the inputs of the first BP neural network, and obtaining the PID parameters of the first PID controller through BP neural network algorithm operation; the g_vo after the operation of the first PID controller is used as the input of the voltage loop. After PID operation between g_vo and the voltage sampling value ADV o, the value u1 is obtained. The smaller value between the value u1 and the output value u2 of the current loop is taken as the value uo. The value uo acts on the potentiostat module to form a closed-loop control, so that the reference potential value follows the potentiostat setting value.

[0060] Optionally, the potentiostat control is completed when the error between the reference potential value and the potentiostat setting value is less than 5mV.

[0061] (2) Constant current control in local control mode:

[0062] Turn the local / remote control switch of all potentiostat modules to local control. After the system is powered on, it works in local control mode. Set the output current and the output current ratio of each potentiostat on the industrial computer, and the set values will be distributed to each potentiostat module proportionally;

[0063] After the potentiostat module receives the output current set value, it uses the current loop to achieve constant current control: Take the normalized current set value Io_g, the error value eio between Io_g and the output current sampled value ADIo as the input of the third BP neural network. After the BP neural network algorithm operation, obtain the PID parameters of the third PID controller. After the third PID controller operates, output the value u2. Take the smaller value between the value u2 and the output value u1 of the voltage loop to get the value uo. The value uo acts on the potentiostat module to form a closed-loop control, so that the actual output current follows the output current set value.

[0064] Optionally, complete the constant current control when the error between the actual output current and the current set value is less than 20 mA.

[0065] (3) Constant current control in remote control mode:

[0066] Turn the local / remote control switch of all potentiostat modules to remote control. After the system is powered on, it works in remote control mode. The remote control center issues the output current set value and the output current ratio of each potentiostat. After the industrial computer receives the instruction, it distributes the set values to each potentiostat module proportionally;

[0067] After the potentiostat module receives the output current set value, it uses the current loop to achieve constant current control: Take the normalized current set value Io_g, the error value eio between Io_g and the output current sampled value ADIo as the input of the third BP neural network. After the BP neural network algorithm operation, obtain the PID parameters of the third PID controller. After the third PID controller operates, output the value u2. Take the smaller value between the value u2 and the output value u1 of the voltage loop to get the value uo. The value uo acts on the potentiostat module to form a closed-loop control, so that the actual output current follows the output current set value.

[0068] Optionally, complete the constant current control when the error between the actual output current and the current set value is less than 20 mA.

[0069] (4) Constant voltage control in remote control mode:

[0070] Turn the local / remote control switch of all potentiostat modules to remote control. After the system is powered on, it works in remote control mode. Set the constant voltage set value in the remote control center. After the industrial computer receives the instruction, it distributes the constant voltage set value to each potentiostat module respectively;

[0071] After the potentiostat module receives the constant voltage setting instruction, it assigns the input of the potential loop to the preset value (the preset value can be -3.5V). In this case, the output of the potential loop is greater than the normalized constant voltage setting value to ensure that the potential loop does not function. After normalizing the constant voltage setting value, it is assigned to g_vo. The error value evo between g_vo and the voltage sampling value ADvo is used as the input of the voltage loop for PID operation. The operation result value u1 is compared with the current loop output value u2, and the smaller value is taken to obtain the value uo. The value uo acts on the potentiostat module for closed-loop control, so that the actual output voltage follows the constant voltage setting value.

[0072] Optionally, the potentiostatic control is completed when the error between the reference potential value and the constant voltage setting value is less than 10 mV.

[0073] Embodiment 3:

[0074] The marine intelligent switch potentiostatic control system described in the present invention has an industrial computer, which can realize data display and parameter setting of the entire control system; Figure 3 is one of the schematic diagrams of the control interface of the industrial computer provided by the present invention. As Figure 3 shown, it displays the overall information of the system, such as open-phase alarm, temperature alarm, operating status, fan failure, output overvoltage, output overcurrent and other fault states. When normal, the green light is on, and when a fault alarm occurs, the red light is on. It also displays the local / remote control status, module ID, output and voltage, output current, total current, and protection potential of each potentiostat module; Figure 4 is the second schematic diagram of the control interface of the industrial computer provided by the present invention. As Figure 4 shown, it displays the ID numbers, output currents, working modes, and protection potentials of 6 potentiostat modules, and also has the functions of setting on / off, setting protection potential, and setting output current.

[0075] In addition to the data display and parameter setting functions, the industrial computer also has the functions of historical data storage and historical event recording. When an abnormal power failure or fault occurs during the unattended operation of the control system, the historical data and historical events saved on the industrial computer can be viewed, and it supports copying the historical data to a USB flash drive and sending it to the manufacturer. Ordinary technicians can quickly locate the fault type according to the user manual, handle the fault, and restore the normal operation of the system; greatly improving the maintainability of the system and reducing the maintenance cost.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A marine intelligent switch constant potential control system, characterized in that: include: Circuit breaker, EMC filter, multiple potentiostat modules, industrial computer, two reference electrodes, remote control center, multiple auxiliary anodes corresponding to the potentiostat modules; The circuit breaker is connected in series between the three-phase AC source and the EMC filter to control the power on and off of the system; The EMC filter is connected to an industrial computer and a plurality of parallel-connected constant potential instrument modules to realize the electromagnetic compatibility function of the system; The output positive pole of each constant potential meter module is connected to the corresponding auxiliary anode, the negative pole of each constant potential meter module is connected to the hull, and the two reference electrodes of the system are connected to the two constant potential meter modules one by one; the input of the constant potential meter module is three-phase alternating current, and the output is direct current voltage; The industrial computer and all the constant potentiostat modules are connected in parallel to the first CAN bus, the industrial computer and the remote control center are connected in parallel to the second CAN bus, and the industrial computer and the remote control center are in communication connection; The industrial computer is also used to obtain status information reported by each constant potential instrument module and control the output of the constant potential instrument module; the status information includes: input voltage information, input current information, output voltage information, output current information, temperature information, two-way reference potential information and fault alarm information of the constant potential instrument module; The fault alarm information includes phase loss alarm, output overvoltage, output overcurrent, overtemperature alarm, input overvoltage, input undervoltage, and fan failure.

2. The marine intelligent switch constant potential control system according to claim 1 is characterized in that: The system adopts a modular design, the output current of each constant potentiostat module is within a preset current range, and the output voltage of each constant potentiostat module is within a preset voltage range.

3. The marine intelligent switch constant potential control system according to claim 1 is characterized in that: Based on digital control technology, the constant potential instrument module realizes the output of constant potential, constant current and constant voltage under the control of an industrial computer; and each constant potential instrument module has a unique identity.

4. The marine intelligent switch constant potential control system according to claim 1, characterized in that: The industrial computer has a display module, CAN communication, LAN communication, wireless communication functions and artificial intelligence voice control functions.

5. The marine intelligent switch constant potential control system according to claim 1, characterized in that: The industrial computer communicates with the constant potentiostat module via CAN, obtains the status information reported by the constant potentiostat module, analyzes the status information, and displays it on the display module; The industrial computer is also used to set the working parameter information of the constant potential instrument module; the working parameter information includes: protection potential information, output current information and output voltage information.

6. The marine intelligent switch constant potential control system according to claim 5, characterized in that: The display module is a touchable liquid crystal display screen.

7. A control method for a constant potential control system of a marine intelligent switch, characterized in that: Applicable to the intelligent switch constant potential control system as claimed in claims 1 to 6, the control loop of the constant potential instrument module consists of a potential loop, a voltage loop and a current loop, the potential loop is connected in series with the voltage loop and then connected in parallel with the current loop; the control method comprises: Constant potential control in local control mode: Turn the local control / remote control switch of all constant potential instrument modules to local control. After the system is powered on, it works in local control mode. The constant potential instrument module samples the reference potential of the reference electrode and reports it to the industrial computer. Set the protection potential on the industrial computer. The constant potential instrument module receives the protection potential setting value and uses the potential loop to realize constant potential control: the normalized protection potential setting value Vref_g, the reference potential ADVref and the error value evref of Vref_g are used as the input of the first BP neural network, and the PID parameters of the first PID controller are obtained through the BP neural network algorithm operation; the first PID controller outputs g_vo as the voltage loop input after operation, and the value u1 is obtained after the PID operation of g_vo and the voltage sampling value ADVo. The smaller value u1 and the current loop output value u2 are obtained to obtain the value uo, and the value uo acts on the constant potential instrument module to form a closed-loop control, so that the reference potential value follows the constant potential setting value.

8. The control method of the marine intelligent switch constant potential control system according to claim 7, characterized in that: Also includes: Constant current control in local control mode: Set the local control / remote control switch of all the constant potentiostat modules to local control. After the system is powered on, it will work in the local control mode. Set the output current and the output current ratio of each constant potentiostat on the industrial computer. The set value will be distributed and sent to each constant potentiostat module in proportion. After receiving the output current setting value, the constant current control is realized by using the current loop: the error value eio between the normalized current setting value Io_g, Io_g and the output current sampling value ADIo is used as the input of the third BP neural network, and the PID parameters of the third PID controller are obtained through the BP neural network algorithm. After the calculation, the third PID controller outputs the value u2, and the smaller value u2 and the voltage loop output value u1 are obtained to obtain the value uo. The value uo acts on the constant current instrument module to form a closed-loop control, so that the actual output current follows the output current setting value.

9. The control method of the constant potential control system of a marine intelligent switch according to claim 7, characterized in that: Also includes: Constant current control in remote control mode: Set the local control / remote control switch of all constant potentiostat modules to remote control. After the system is powered on, it will work in remote control mode. The remote control center will send the output current setting value and the output current ratio of each constant potentiostat. After receiving the command, the industrial computer will send the setting value to each constant potentiostat module in proportion. After receiving the output current setting value, the constant current control is realized by using the current loop: the error value eio between the normalized current setting value Io_g, Io_g and the output current sampling value ADIo is used as the input of the third BP neural network, and the PID parameters of the third PID controller are obtained through the BP neural network algorithm. After the calculation, the third PID controller outputs the value u2, and the smaller value u2 and the voltage loop output value u1 are obtained to obtain the value uo. The value uo acts on the constant current instrument module to form a closed-loop control, so that the actual output current follows the output current setting value.

10. The control method of the constant potential control system of a marine intelligent switch according to claim 7, characterized in that: Also includes: Constant voltage control in remote control mode: Set the local control / remote control switch of all constant potentiostat modules to remote control. After the system is powered on, it will work in remote control mode. Set the constant voltage setting value in the remote control center. After receiving the command, the industrial computer will send the constant voltage setting value to each constant potentiostat module respectively. After receiving the constant voltage setting instruction, the constant potentiostat module assigns the input of the potential loop to the preset value to ensure that the potential loop does not work. In this way, the constant voltage setting value is directly assigned to g_vo after normalization. The error value evo between g_vo and the voltage sampling value ADvo is used as the input of the second PID controller for calculation. The calculation result value u1 is compared with the current loop output value u2 to obtain the smaller value uo. The value uo acts on the constant potentiostat module for closed-loop control, so that the actual output voltage follows the constant voltage setting value.

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