Control method for parallel operation of multiple pumps and related equipment

Abstract

The embodiment of the invention provides a control method for parallel operation of multiple pumps and related equipment, and belongs to the technical field of water pump control. The method is applied to a converter valve cooling system and comprises the steps that a first water pump and a third water pump are started at the same time, multi-source monitoring data of the first water pump and the third water pump are obtained, and the multi-source monitoring data comprise continuous operation time, power quality data, working temperature data and system pressure data of each water pump; according to the multi-source monitoring data, whether preset switching control conditions are met or not is judged, a target water pump is obtained, and the preset switching control conditions comprise a timing rotation condition, a power supply fault condition, an overheating protection condition and a pressure abnormity condition; and when the preset switching control condition occurs, pump switching control is conducted on the target water pump according to the bus relation on the basis of the preset delayed pump switching time. According to the embodiment of the invention, the switching stability during parallel operation of the multiple water pumps can be improved, energy-saving operation is realized, the service life of the system is prolonged, and the control cost is reduced.

Description

Technical Field

[0001] This application relates to the field of pump control technology, and in particular to a control method and related equipment for the parallel operation of multiple pumps. Background Technology

[0002] Currently, converter valve cooling systems typically use two main pumps, one in operation and one on standby. For systems with high heat exchange and high flow rates, multiple pumps are usually required. However, the parallel operation of multiple pumps introduces a series of risks and challenges. When one pump suddenly starts or stops, a pressure wave is generated in the shared pipeline, impacting the other operating pump and the entire system. This pressure shock can damage the pump impeller, seals, valves, and pipe connections. Furthermore, unstable water flow can cause abnormal vibration and noise in the pump body and pipelines, and long-term operation will accelerate the fatigue failure of mechanical seals, bearings, and connecting parts. Summary of the Invention

[0003] The main objective of this application is to propose a control method and related equipment for the parallel operation of multiple pumps, which aims to improve the stability of switching when multiple pumps are running in parallel, achieve energy saving, extend the service life of the system, and reduce control costs.

[0004] To achieve the above objectives, one aspect of this application proposes a control method for parallel operation of multiple pumps. The method is applied to a converter valve cooling system, which includes a first water pump, a second water pump, a third water pump, and a fourth water pump. The first and second water pumps are powered by a first DC bus, and the third and fourth water pumps are powered by a second DC bus. The method includes the following steps: Simultaneously start the first water pump and the third water pump, and acquire multi-source monitoring data of the first water pump and the third water pump, wherein the multi-source monitoring data includes the continuous running time, power quality data, operating temperature data and system pressure data of each water pump; Based on the multi-source monitoring data, it is determined whether the preset switching control conditions are met, and the target water pump is obtained. The preset switching control conditions include timed rotation conditions, power failure conditions, overheat protection conditions, and pressure abnormal conditions. When at least one of the timed rotation conditions, the power failure conditions, the overheat protection conditions, and the pressure abnormal conditions is met, the preset switching control conditions are met. When the preset switching control condition occurs, the target water pump is switched off based on the preset delay pump switching time and the bus relationship.

[0005] In some embodiments, the converter valve cooling system further includes a power monitor, a temperature transmitter, and a pressure transmitter. Acquiring multi-source monitoring data from the first water pump and the third water pump includes the following steps: The running time of the first water pump and the third water pump after startup is obtained, and the continuous running time of each water pump is obtained. The power supply monitor monitors the power signals of the first water pump and the third water pump and performs signal processing to obtain power quality data for each water pump. The power quality data includes voltage, current, frequency, three-phase imbalance, and harmonic distortion. The operating temperature data of each water pump is obtained by monitoring the motor bearings and three-phase windings of the first and third water pumps using the temperature transmitter. The operating temperature data includes the motor bearing temperature and the single-phase winding temperature. The system pressure data is obtained by monitoring the inlet valve of the converter valve cooling system and the outlets of the first and third water pumps using a pressure transmitter. The system pressure data includes the system inlet valve pressure and the outlet pressure of each water pump.

[0006] In some embodiments, determining whether a preset switching control condition is met based on the multi-source monitoring data to obtain the target water pump includes the following steps: The continuous operating time of the first water pump and the third water pump is compared with the preset switching time to determine whether the timed rotation condition is met. The timed rotation condition includes a first sub-condition and a second sub-condition. The timed rotation condition is met when at least one of the first sub-condition and the second sub-condition is met. The first sub-condition is that the continuous operating time of the first water pump is greater than or equal to the preset switching time. The second sub-condition is that the continuous operating time of the third water pump is greater than or equal to the preset switching time. The preset switching time of each water pump is different. The target water pump is determined from the first water pump and the third water pump according to the established timed rotation conditions; When the preset switching control condition occurs, the target water pump is controlled to switch off based on the preset delay pump switching time and the bus relationship, including the following steps: When the aforementioned timed switching condition occurs, the preset delay pump switching time is determined as the first delay; After the first delay, the target water pump is switched to another water pump on the same DC bus.

[0007] In some embodiments, determining whether a preset switching control condition is met based on the multi-source monitoring data to obtain the target water pump includes the following steps: The power supply failure condition is determined based on the power quality data of the first water pump and the third water pump. The power supply failure condition includes a third sub-condition, a fourth sub-condition, a fifth sub-condition, a sixth sub-condition, and a seventh sub-condition. The power supply failure condition is established when at least one of the third, fourth, fifth, sixth, and seventh sub-conditions is established. The third sub-condition is voltage instability, the fourth sub-condition is current overcurrent, the fifth sub-condition is frequency fluctuation, the sixth sub-condition is three-phase imbalance, and the seventh sub-condition is harmonic distortion. The target water pump is determined from the first water pump and the third water pump based on the established power failure conditions. When the preset switching control condition occurs, the target water pump is controlled to switch off based on the preset delay pump switching time and the bus relationship, including the following steps: When the power failure condition occurs, the preset delay pump switching time is determined as the first delay; After the first delay, the target water pump is switched to another water pump on the same DC bus.

[0008] In some embodiments, determining whether a preset switching control condition is met based on the multi-source monitoring data to obtain the target water pump includes the following steps: The overheat protection condition is determined based on the operating temperature data of the first water pump and the third water pump. The overheat protection condition includes an eighth sub-condition and a ninth sub-condition. The overheat protection condition is established when at least one of the eighth sub-condition and the ninth sub-condition is established. The eighth sub-condition is that the temperature of the motor bearing is greater than a preset first temperature threshold, and the ninth sub-condition is that the temperature of the single-phase winding is greater than a preset second temperature threshold. The target water pump is determined from the first water pump and the third water pump according to the established overheat protection conditions; When the preset switching control condition occurs, the target water pump is controlled to switch off based on the preset delay pump switching time and the bus relationship, including the following steps: When the overheat protection condition occurs, the preset delay pump-stop time is determined as the first delay; After the first delay, the target water pump is switched to another water pump on the same DC bus.

[0009] In some embodiments, determining whether a preset switching control condition is met based on the multi-source monitoring data to obtain the target water pump includes the following steps: The system pressure data of the first water pump and the third water pump are used to determine whether the pressure abnormality condition is met. The pressure abnormality condition includes a tenth sub-condition and an eleventh sub-condition. When the tenth sub-condition and the eleventh sub-condition are met at the same time, the pressure abnormality condition is met. The tenth sub-condition is that the system inlet valve pressure is less than a preset first pressure threshold, and the eleventh sub-condition is that the outlet water pressure is less than a preset second pressure threshold. The target water pump is determined from the first water pump and the third water pump based on the established pressure anomaly conditions. When the preset switching control condition occurs, the target water pump is controlled to switch off based on the preset delay pump switching time and the bus relationship, including the following steps: When the aforementioned abnormal pressure condition occurs, the preset delay pump switching time is determined to be the second delay. After the second delay, the target water pump is switched to another water pump on the same DC bus.

[0010] To achieve the above objectives, another aspect of this application proposes a control system for multiple pumps operating in parallel, the system comprising: The data acquisition module is used to simultaneously start the first water pump and the third water pump, and acquire multi-source monitoring data of the first water pump and the third water pump. The multi-source monitoring data includes the continuous running time, power quality data, operating temperature data and system pressure data of each water pump. The switching judgment module is used to determine whether the preset switching control conditions are met based on the multi-source monitoring data to obtain the target water pump. The preset switching control conditions include timed rotation conditions, power failure conditions, overheat protection conditions, and pressure abnormal conditions. When at least one of the timed rotation conditions, the power failure conditions, the overheat protection conditions, and the pressure abnormal conditions is met, the preset switching control conditions are met. The pump switching control module is used to control the target water pump to switch off based on a preset delay pump switching time and the bus relationship when the preset switching control condition occurs.

[0011] To achieve the above objectives, another aspect of this application provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the above-described method.

[0012] To achieve the above objectives, another aspect of the embodiments of this application proposes a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method.

[0013] To achieve the above objectives, another aspect of this application provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0014] The embodiments of this application include at least the following beneficial effects: This application provides a control method and related equipment for parallel operation of multiple pumps. This scheme simultaneously starts a first pump and a third pump, and acquires multi-source monitoring data from the first and third pumps. The multi-source monitoring data includes the continuous operating time, power quality data, operating temperature data, and system pressure data of each pump. Based on the multi-source monitoring data, it is determined whether preset switching control conditions are met to obtain the target pump. The preset switching control conditions include timed rotation conditions, power failure conditions, overheat protection conditions, and pressure anomaly conditions. The preset switching control conditions are met when at least one of these conditions is met. When the preset switching control conditions occur, the target pump is switched off based on a preset delay pump-off time and the bus relationship. The embodiments of this application can improve the stability of switching when multiple pumps are running in parallel, achieve energy saving, extend system lifespan, and reduce control costs. Attached Figure Description

[0015] Figure 1 This is a flowchart of a control method for parallel operation of multiple pumps provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the control system for multi-pump parallel operation provided in the embodiments of this application; Figure 3 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of systems and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0017] Unless otherwise defined, 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 application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0018] The control method for parallel operation of multiple pumps provided in this application relates to the field of water pump control. This control method can be applied to a terminal, a server, or software running on either a terminal or a server. In some embodiments, the terminal can be a smartphone, tablet, laptop, desktop computer, smart speaker, smartwatch, or vehicle terminal, but is not limited thereto. The server can be configured as an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The server can also be a node server in a blockchain network. The software can be an application that implements the control method for parallel operation of multiple pumps, but is not limited to the above forms.

[0019] This application can be used in a wide variety of general-purpose or special-purpose computer system environments or configurations. Examples include: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics devices, network PCs, minicomputers, mainframe computers, and distributed computing environments including any of the above systems or devices. This application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform specific tasks or implement specific abstract data types. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0020] Figure 1 This is an optional flowchart of the control method for multi-pump parallel operation provided in the embodiments of this application. Figure 1 The method may include, but is not limited to, steps S101 to S103.

[0021] Step S101: Simultaneously start the first water pump and the third water pump, and acquire multi-source monitoring data of the first water pump and the third water pump.

[0022] Step S102: Determine whether the preset switching control conditions are met based on the multi-source monitoring data to obtain the target water pump.

[0023] Step S103: When a preset switching control condition occurs, the target water pump is switched off based on the preset delay pump switching time and the bus relationship.

[0024] In this embodiment, the multi-pump parallel operation control method is applied to the converter valve cooling system. This cooling system is a closed-loop circulation system that continuously provides cooling water to the cooled components, specifically for cooling the converter valve. The main pump delivers low-temperature coolant to the cooled equipment, and then delivers the high-temperature coolant returning from the cooled equipment to a cooling tower or air cooler for heat exchange, thus achieving the heat dissipation function. Furthermore, when the temperature is lower than the required operating temperature, the heater is activated to heat the coolant.

[0025] Specifically, the converter valve cooling system includes a multi-pump parallel operation unit, a constant temperature unit, a pressure stabilizing unit, a water supply unit, and a deionization unit.

[0026] The multi-pump parallel operation unit is equipped with four water pumps: the first water pump P01, the second water pump P02, the third water pump P03, and the fourth water pump P04. It adopts a 2-in-use and 2-in-standby operation mode. The first water pump P01 and the second water pump P02 are powered by the first DC bus, and the third water pump P03 and the fourth water pump P04 are powered by the second DC bus to provide circulation power for the cooling medium.

[0027] The thermostatic unit includes a heater and a plate heat exchanger, which are used to precisely control the temperature of the cooling medium and ensure that the cooled equipment always operates in the optimal temperature environment.

[0028] The pressure stabilizing unit includes an expansion tank, a nitrogen cylinder, a gas supply valve, and a gas exhaust valve. It is used to stabilize the system pressure and accommodate the thermal expansion and contraction of the medium. It is an indispensable safety buffer unit of the system.

[0029] The water replenishment unit includes a water replenishment tank, a water replenishment pump, and a water replenishment valve. When the system medium experiences a slight leak or evaporation, it automatically replenishes the system with cooling medium to maintain stable system pressure and sufficient water volume.

[0030] The deionization unit includes a deionization tank and resin, which continuously removes ionic impurities from the circulating cooling water, greatly reducing the water's conductivity and thus preventing the formation of the circuit required for electrochemical corrosion. This effectively protects metal components such as pipes, pumps, and heat exchangers from corrosion and extends the system's lifespan.

[0031] First, assuming that pumps P01 and P03 are the main pumps and pumps P02 and P04 are the standby pumps, when the converter valve cooling system is started, the two main pumps start simultaneously as the initial operating pumps according to the system power-on or start command. After starting, they continuously and synchronously collect multi-source monitoring data of P01 and P03 in parallel.

[0032] Multi-source monitoring data is a comprehensive collection of information that integrates real-time information from multiple dimensions such as time series, electrical, and thermodynamics, including but not limited to the continuous operating time of each water pump, power quality data, operating temperature data, and system pressure data.

[0033] The continuous running time is the total time that the water pump has accumulated since its most recent start-up. This indicator can evenly distribute the workload of all water pumps by measuring the length of the running time, avoiding the main pump running for a long time while the standby pump is idle.

[0034] Power quality data is used to diagnose potential faults in the power supply circuit of operating pumps, enabling rapid switching before a fault occurs and proactively preventing power quality from affecting motor life.

[0035] Operating temperature data is used to implement overheat protection and is obtained by collecting temperature data from the motor's bearings and windings.

[0036] System pressure data is used to assess the hydraulic stability of the entire system. By coordinating the monitoring of the pressure values ​​at the system inlet valve and pump outlet, faulty pumps with low flow and low pressure can be located.

[0037] After acquiring multi-source monitoring data, the process enters the condition judgment stage. The judgment process is based on a series of pre-set switching control conditions according to different risk types. Among them, the preset switching control conditions include timed rotation conditions, power failure conditions, overheat protection conditions, and pressure abnormal conditions. When at least one of the timed rotation conditions, power failure conditions, overheat protection conditions, and pressure abnormal conditions is met, the preset switching control conditions are met.

[0038] For example, the timed rotation condition is used to determine whether the current operating pump has been running for a long time based on the continuous running time. When a certain operating pump has been running for a long time, the timed rotation condition is determined to be true.

[0039] Power supply fault conditions are used to analyze power quality data to identify whether there are faults that damage the motor caused by power quality problems. When the power supply voltage of a certain operating pump is unstable, there is overcurrent, three-phase imbalance, harmonic distortion, or frequency fluctuation, the power supply fault condition is determined to be true.

[0040] The overheat protection condition is used to check whether the operating temperature data exceeds the safety threshold. When the current operating temperature data of a certain operating pump exceeds the safety threshold, it indicates that it is currently operating at a high temperature, and the overheat protection condition is determined to be valid.

[0041] The pressure anomaly condition is used to check whether the pressure of the operating pumps is stable within the normal range based on the system pressure data. When the pressure of a certain operating pump drops significantly, the power failure condition is determined.

[0042] It is understandable that the above four preset switching control conditions are independent of each other and can be executed in parallel. By monitoring and alarming the water pump power supply, system pressure, motor temperature, etc. based on multi-source monitoring data, the water pump that meets at least one of the following conditions from the running pumps P01 and P03 is accurately located as the target water pump for executing pump switching control.

[0043] The aforementioned switching control can intelligently coordinate and control multiple water pumps by setting four switching conditions, thereby achieving energy-saving optimization. Among them, the timed rotation condition, based on the load balance of the running time, ensures that all motors operate in the high-efficiency range, avoiding the imbalance of some motors running at high load for a long time while others are idle, thus improving the overall energy efficiency of the entire system. The power failure condition, overheat protection condition, and pressure abnormal condition can effectively prevent energy waste caused by poor operating conditions such as voltage imbalance, overcurrent, and overheating by real-time monitoring of power supply, temperature, pressure, and other parameters.

[0044] Optionally, if none of the four preset switching control conditions are met, it indicates that the converter valve cooling system is in an ideal working state. At this time, there is no target water pump in the system that needs to be switched off. The system will continue to run the currently operating pump and continuously acquire multi-source monitoring data.

[0045] Once any preset switching control condition occurs, the system adopts different delay strategies based on the type of preset switching control condition that triggers it, and adaptively responds to the pump switching control based on the preset delay pump switching time.

[0046] Specifically, for conditions requiring rapid response, a no-delay switching method is adopted, while for conditions requiring fault recording, the target water pump is stopped and the backup pump is started after a certain delay is captured within the system's allowable range.

[0047] In some embodiments, step S101 may include, but is not limited to, steps S201 to S204.

[0048] Step S201: Obtain the running time of the first and third water pumps after they are started, and obtain the continuous running time of each water pump.

[0049] Step S202: Monitor the power signals of the first and third water pumps through a power monitor and perform signal processing to obtain power quality data for each water pump.

[0050] Step S203: Monitor the motor bearings and three-phase windings of the first and third water pumps using a temperature transmitter to obtain the operating temperature data of each water pump.

[0051] Step S204: The system pressure data is obtained by monitoring the inlet valve of the converter valve cooling system and the outlet of the first and third water pumps through the pressure transmitter.

[0052] In this embodiment, to facilitate real-time acquisition of multi-source monitoring data, the converter valve cooling system is also equipped with a power monitor, a temperature transmitter, and a pressure transmitter for each water pump.

[0053] Specifically, the continuous running time record is the total duration of a single operation of each water pump. The running time of the first and third water pumps is accumulated independently, starting from the start time of each pump and ending at the current time or the time they stopped. By accurately recording the duration of each pump from start to finish, the continuous running time of each pump is obtained.

[0054] Understandably, the continuous running time is reset to zero each time the water pump stops running, so as to provide a completely new timing cycle for the next startup.

[0055] Each water pump's power monitor acquires power signals by monitoring the power supply circuit connected to the pump. Through signal processing such as RMS calculation and Fourier transform, power quality data such as voltage, current, frequency, three-phase imbalance, and harmonic distortion are obtained. For example, the frequency is determined by analyzing the zero-crossing point of the voltage waveform; the three-phase imbalance is calculated as the ratio of the difference between the maximum and minimum voltages in the three-phase power supply to the average current of the three-phase power supply; the power signal is decomposed into a linear superposition of DC components and sinusoidal signals of different frequencies through Fourier transform; and the harmonic distortion is calculated as the root mean square value of all harmonics and the ratio of the root mean square value to the root mean square value of the fundamental frequency.

[0056] Each water pump is equipped with multiple temperature transmitters, which are installed next to the motor bearings and the three-phase windings of the motor, respectively, to detect the temperature of the motor bearings and the temperature of each single-phase winding in the three-phase windings in real time, so as to obtain the operating temperature data.

[0057] To ensure the stable operation of the closed cooling system, the pressure transmitter monitors the pressure at the outlet of each water pump in the inlet valve of the converter valve cooling system, and simultaneously collects the system inlet valve pressure and the outlet pressure of each water pump to obtain system pressure data.

[0058] In some embodiments, step S102 may include, but is not limited to, steps S301 to S302.

[0059] Step S301: Compare the continuous running time of the first water pump and the third water pump with the preset switching time to determine whether the timed rotation condition is met.

[0060] Step S302: Determine the target water pump from the first water pump and the third water pump according to the established timed rotation conditions.

[0061] Step S103 may include, but is not limited to, steps S303 to S304.

[0062] Step S303: When a timed switching condition occurs, the preset delay pump switching time is determined to be the first delay.

[0063] In step S304, after the first delay, the target water pump is switched to another water pump on the same DC bus.

[0064] In this embodiment, to avoid the first and third water pumps running for extended periods while other pumps remain idle, thus affecting the overall system lifespan, the pumps are controlled using a rotating operation mode. The system compares the continuous operating time of the first water pump with a preset switching time, and simultaneously compares the continuous operating time of the third water pump with the preset switching time, to determine whether the timed rotation condition is met. The timed rotation condition includes a first sub-condition and a second sub-condition. The timed rotation condition is met when at least one of the first and second sub-conditions is met. The first sub-condition is that the continuous operating time of the first water pump is greater than or equal to the preset switching time, and the second sub-condition is that the continuous operating time of the third water pump is greater than or equal to the preset switching time.

[0065] Optionally, when the system is first started, the first and third water pumps start simultaneously. Since the two pumps have the same continuous running time, they will perform the pump switching action at the same time. To avoid excessive instantaneous current caused by the simultaneous switching of the two pumps, the preset switching time for each pump in this embodiment is different. This differentiated switching can stagger the switching actions of each pump on the time axis, thereby avoiding the two pumps reaching the threshold at the same time and ensuring the stability of the system.

[0066] For example, the preset switching times of the four water pumps are set to differ by 1 minute. For instance, if the first preset switching time for P01 is X minutes, then the second preset switching time for P02 is X+1 minutes, the third preset switching time for P03 is X+2 minutes, and the fourth preset switching time for P04 is X+3 minutes.

[0067] When the continuous running time of a certain water pump is detected to be greater than or equal to its corresponding preset switching time according to the timed rotation conditions, for example, the continuous running time of the first water pump is greater than or equal to the first preset switching time X minutes, then the first water pump is determined as the target water pump for long-term operation.

[0068] Furthermore, when it is determined that the preset switching control condition is triggered by the timed rotation condition, the system determines that the switching scenario is preventive maintenance, the purpose of which is to balance the load. Therefore, the preset delay pump switching time is determined as the first delay, where the first delay is an extremely short time window, which can usually be set from no delay to a delay of several milliseconds.

[0069] Starting from the shutdown of the target pump, after the first delay, the standby pump is started. When performing pump switching control, priority is given to switching the target pump to another pump on the same DC bus.

[0070] For example, the first water pump and the second water pump are powered by the same DC bus, and the third water pump and the fourth water pump are powered by the same DC bus. Therefore, when the target water pump is the first water pump, the second water pump will start running after the first delay. Similarly, when the target water pump is the third water pump, the fourth water pump will start running after the first delay.

[0071] In some other embodiments, step S102 may include, but is not limited to, steps S401 to S402.

[0072] Step S401: Determine whether the power failure condition is met based on the power quality data of the first and third water pumps.

[0073] Step S402: Determine the target water pump from the first water pump and the third water pump based on the established power failure conditions.

[0074] Step S103 may include, but is not limited to, steps S403 to S404.

[0075] Step S403: When a power failure occurs, the preset delay pump switching time is determined to be the first delay.

[0076] In step S404, after the first delay, the target water pump is switched to another water pump on the same DC bus.

[0077] In this embodiment, power quality can be monitored based on power quality data. The power fault condition is determined based on the power quality data of the first and third water pumps. The power fault condition includes a third sub-condition, a fourth sub-condition, a fifth sub-condition, a sixth sub-condition, and a seventh sub-condition. The power fault condition is established when at least one of the third, fourth, fifth, sixth, and seventh sub-conditions is established. The third sub-condition is voltage instability, the fourth sub-condition is current overcurrent, the fifth sub-condition is frequency fluctuation, the sixth sub-condition is three-phase imbalance, and the seventh sub-condition is harmonic distortion.

[0078] Specifically, the third sub-condition is determined based on the voltage. Voltage instability includes sudden rises, falls, or deviations from the rated range. The voltage fluctuation can be determined by calculating the voltage change over a certain period of time. If the voltage change exceeds the fluctuation threshold, the third sub-condition can be considered to be met. Alternatively, the instantaneous voltage can be compared with the rated voltage. If the instantaneous voltage exceeds the rated voltage range, the third sub-condition can also be considered to be met.

[0079] The fourth sub-condition is determined based on the current. Overcurrent can be determined by comparing the instantaneous current with the rated current. If the instantaneous current is greater than the rated current, the fourth sub-condition is considered to be met.

[0080] The fifth sub-condition is determined based on the frequency. Frequency is an indicator of power supply stability. In a stable power grid, the frequency should be maintained within a very small tolerance range near the rated value. By comparing the frequency with the rated frequency range, the fifth sub-condition is considered to be met when the frequency exceeds the rated frequency range.

[0081] The sixth sub-condition is determined based on the three-phase unbalance. Three-phase unbalance is usually caused by the inconsistency of the amplitude and phase angle of the three-phase current and voltage. The calculated three-phase unbalance is compared with the balance threshold. If the three-phase unbalance is greater than the balance threshold, the sixth sub-condition is considered to be valid.

[0082] The seventh sub-condition is determined based on the degree of harmonic distortion. Harmonic distortion is usually caused by the system not being perfectly linear. The calculated degree of harmonic distortion is compared with the distortion threshold. If the degree of harmonic distortion is greater than the distortion threshold, the seventh sub-condition is considered to be valid.

[0083] Regardless of whether the above five sub-conditions result in voltage instability, current overcurrent, frequency fluctuation, three-phase imbalance, or harmonic distortion, the system will consider the power supply fault condition to be met. This is because any type of power supply abnormality is considered a risk that requires intervention. For example, if the power quality data shows that the voltage of the first water pump is stable, the current is normal, the frequency is not fluctuating, and the three phases are balanced, and only the power supply circuit has harmonic distortion, then the first water pump will be identified as the target water pump that needs to be switched.

[0084] When the preset switching control condition is determined to be triggered by a power failure, the system determines that the switching scenario is poor power quality. A rapid switch is required to avoid the power quality affecting the motor life and to avoid alarms such as low system flow and low pressure when only one pump is running for a short period of time. Therefore, the target water pump is stopped without delay, and the standby pump on the same DC bus as the target water pump is started first.

[0085] In some other embodiments, step S102 may include, but is not limited to, steps S501 to S502.

[0086] Step S501: Determine whether the overheat protection condition is met based on the operating temperature data of the first and third water pumps.

[0087] Step S502: Determine the target water pump from the first water pump and the third water pump according to the established overheat protection conditions.

[0088] Step S103 may include, but is not limited to, steps S503 to S504.

[0089] Step S503: When an overheat protection condition occurs, the preset delay pump cut-off time is determined to be the first delay.

[0090] In step S504, after the first delay, the target water pump is switched to another water pump on the same DC bus.

[0091] In this embodiment, the overheat protection condition is determined based on the operating temperature data of the first water pump and the third water pump. The overheat protection condition includes an eighth sub-condition and a ninth sub-condition. The overheat protection condition is established when at least one of the eighth and ninth sub-conditions is established. The eighth sub-condition is that the motor bearing temperature is greater than a preset first temperature threshold, and the ninth sub-condition is that the single-phase winding temperature is greater than a preset second temperature threshold.

[0092] Specifically, the eighth sub-condition is determined based on the motor bearing temperature. When the motor is running at high temperature, it is easy to cause problems such as bearing damage and mechanical deformation of internal materials. Therefore, it is necessary to compare the preset first temperature threshold with the motor bearing temperature. The preset first temperature threshold is an upper limit of temperature determined based on the physical properties of the bearing metal material. When the motor bearing temperature is greater than the preset first temperature threshold, the eighth sub-condition is considered to be met.

[0093] The ninth sub-condition is determined based on the temperature of the single-phase winding. When the temperature of the single-phase winding is too high, it is easy to cause insulation damage and breakdown of the motor winding. Therefore, a second temperature threshold is preset and compared with the temperature of the single-phase winding. The preset second temperature threshold is an upper limit of temperature determined based on the winding insulation material. The three-phase windings share the same second temperature threshold. When the temperature of any single-phase winding is greater than the preset second temperature threshold, the ninth sub-condition is considered to be met.

[0094] The purpose of the above two sub-conditions is to achieve thermal protection of the motor. Whether the eighth or ninth sub-condition is met, the system will consider the overheat protection condition to be met and identify the water pump that triggers the overheat protection condition as the target water pump.

[0095] When the preset switching control condition is determined to be triggered by overheat protection, the system determines that the switching scenario is caused by excessive temperature. Since heat accumulation and heat damage are a rapid and irreversible process, the motor will experience increased insulation damage and breakdown, bearing damage, and mechanical deformation of internal materials with every additional moment of operation under high temperature conditions. Therefore, the preset delay pump switching time is determined to be the first delay with the shortest delay. Preferably, when the system detects that the motor bearing temperature of the target water pump is too high or the temperature of any single-phase winding is too high, the target water pump is stopped without delay, and the standby pump on the DC bus of the target water pump is started first.

[0096] In some other embodiments, step S102 may include, but is not limited to, steps S601 to S602.

[0097] Step S601: Determine whether the pressure abnormality condition is met based on the system pressure data of the first and third water pumps.

[0098] Step S602: Determine the target water pump from the first water pump and the third water pump based on the established pressure anomaly conditions.

[0099] Step S103 may include, but is not limited to, steps S603 to S604.

[0100] Step S603: When an abnormal pressure condition occurs, the preset delay pump cut-off time is determined to be the second delay.

[0101] In step S604, after the second delay, the target water pump is switched to another water pump on the same DC bus.

[0102] In this embodiment, the pressure anomaly condition is determined based on the system pressure data of the first water pump and the third water pump, respectively. The pressure anomaly condition includes a tenth sub-condition and an eleventh sub-condition. When both the tenth and eleventh sub-conditions are met, the pressure anomaly condition is met. The tenth sub-condition is that the system inlet valve pressure is less than a preset first pressure threshold, and the eleventh sub-condition is that the outlet water pressure is less than a preset second pressure threshold.

[0103] Specifically, diagnosing pressure anomalies is a crucial step in fault location and system stability. It requires coordinated judgment based on the system inlet valve pressure and the water pump outlet pressure. A preset first pressure threshold is a lower limit to ensure sufficient coolant flow to the converter valve, and a preset second pressure threshold is a lower limit to identify water pump performance. Only when both the system inlet valve pressure and the operating water pump outlet pressure are simultaneously low is the pressure anomaly considered established. If only the tenth sub-condition is met, it indicates the fault may not be at the water pump, and switching the water pump will not improve the situation.

[0104] When the system determines that the preset switching control condition is triggered by an abnormal pressure condition, it identifies the switching scenario as being caused by pump pressure performance. However, since judging low pressure requires pump operation, if the pump is switched off quickly, the pump's operating signal disappears instantly. Consequently, the low inlet valve pressure and low main pump outlet pressure alarms also disappear instantly, causing the HMI interface to fail to capture the alarm information and mistakenly interpret it as system program malfunction. Therefore, a short first delay is not suitable. Furthermore, if the pump switching delay exceeds 1000ms, the system is prone to serious faults such as low flow and extremely low pressure. Comprehensive testing shows that a second delay set between 250ms and 500ms ensures both rapid pump switching without serious fault alarms and that the HMI and OS backend can capture the correct messages.

[0105] For example, assuming that the system inlet valve pressure is low and the outlet pressure of the first water pump is low, the first water pump will stop running 250ms after the abnormal pressure condition is triggered, and the second water pump on the same DC bus as the first water pump will be started.

[0106] The following is a detailed description and explanation of the solutions in the embodiments of this application: The four pump switching control methods provided in this application, in a converter valve cooling system with multiple pumps operating in parallel, achieve load balance and stable system flow and pressure when multiple pumps are running in parallel through soft start and power frequency switching operation modes, as well as monitoring and alarming of pump power supply, system pressure, motor temperature, etc., and can effectively cope with system hydraulic problems such as uneven flow, water hammer, and equipment wear. Practical tests show that they have good control effects and can effectively improve the stability of the converter valve cooling system when multiple pumps are running in parallel, so as to achieve stable and energy-saving system operation.

[0107] Furthermore, the control strategy for multiple water pumps in this embodiment is generally used in systems with large heat dissipation. Compared with valve cooling systems of related technologies, the heat dissipation of a valve cooling system with four water pumps is equivalent to that of two valve cooling systems with two pumps (assuming the pump power is the same). However, a valve cooling system with four water pumps only requires one set of hardware and software control system, while two valve cooling systems with two pumps require two sets of hardware and software control systems. From an economic point of view, the control method for multi-pump parallel operation of four pumps provided in this application can significantly reduce the hardware cost of the control system.

[0108] In summary, this application replaces two dual-pump systems with a single four-pump system, saving energy and cost of the entire control hardware. Furthermore, by balancing the rotation of long-running pumps, the overall lifespan of the equipment is extended, reducing maintenance and replacement costs and achieving energy savings. During switching, an appropriate delay time is selected based on the triggering conditions. This delay prevents excessive instantaneous current during simultaneous switching of two pumps or the inability to capture alarm information. Simultaneously, the rapid, zero-delay switching avoids the occurrence of only one pump operating for a short period, improving the stability of switching when multiple pumps are running in parallel.

[0109] Reference Figure 2 This application also provides a control system for multiple pumps operating in parallel, which can implement the above-described method. The system includes: The data acquisition module is used to simultaneously start the first and third water pumps and acquire multi-source monitoring data of the first and third water pumps. The multi-source monitoring data includes the continuous running time, power quality data, operating temperature data and system pressure data of each water pump.

[0110] The switching judgment module is used to determine whether the preset switching control conditions are met based on multi-source monitoring data to obtain the target water pump. The switching control conditions include timed rotation conditions, power failure conditions, overheat protection conditions, and pressure abnormal conditions. When at least one of the timed rotation conditions, power failure conditions, overheat protection conditions, and pressure abnormal conditions is met, the preset switching control conditions are met.

[0111] The pump switching control module is used to control the target pump to switch off based on a preset delay time and the bus relationship when a preset switching control condition occurs.

[0112] It is understood that the content of the above method embodiments is applicable to this system embodiment. The specific functions implemented in this system embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0113] This application also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the above-described method. This electronic device can be any smart terminal, including tablet computers, in-vehicle computers, etc.

[0114] It is understood that the content of the above method embodiments is applicable to this device embodiment. The specific functions implemented by this device embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0115] Reference Figure 3 , Figure 3The hardware structure of an electronic device according to another embodiment is illustrated. The electronic device includes: The processor 901 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application.

[0116] The memory 902 can be implemented as a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 902 can store the operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 902 and is called and executed by the processor 901 using the methods described in the embodiments of this application.

[0117] The input / output interface 903 is used to implement information input and output.

[0118] The communication interface 904 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0119] Bus 905 transmits information between various components of the device, such as processor 901, memory 902, input / output interface 903, and communication interface 904.

[0120] The processor 901, memory 902, input / output interface 903, and communication interface 904 are connected to each other within the device via bus 905.

[0121] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method.

[0122] It is understood that the content of the above method embodiments is applicable to this storage medium embodiment. The specific functions implemented in this storage medium embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0123] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0124] It is understood that the content of the above method embodiments is applicable to the embodiments of this program product. The specific functions implemented by the embodiments of this program product are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0125] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0126] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0127] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0128] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0129] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0130] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0131] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0132] In the embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between systems or units may be electrical, mechanical, or other forms.

[0133] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0134] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0135] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0136] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A control method for multiple pumps operating in parallel, characterized in that, The method is applied to a converter valve cooling system, which includes a first water pump, a second water pump, a third water pump, and a fourth water pump. The first water pump and the second water pump are powered by a first DC bus, and the third water pump and the fourth water pump are powered by a second DC bus. The method includes the following steps: Simultaneously start the first water pump and the third water pump, and acquire multi-source monitoring data of the first water pump and the third water pump, wherein the multi-source monitoring data includes the continuous running time, power quality data, operating temperature data and system pressure data of each water pump; Based on the multi-source monitoring data, it is determined whether the preset switching control conditions are met, and the target water pump is obtained. The preset switching control conditions include timed rotation conditions, power failure conditions, overheat protection conditions, and pressure abnormal conditions. When at least one of the timed rotation conditions, the power failure conditions, the overheat protection conditions, and the pressure abnormal conditions is met, the preset switching control conditions are met. When the preset switching control condition occurs, the target water pump is switched off based on the preset delay pump switching time and the bus relationship.

2. The method according to claim 1, characterized in that, The converter valve cooling system also includes a power monitor, a temperature transmitter, and a pressure transmitter. Acquiring multi-source monitoring data from the first and third water pumps includes the following steps: The running time of the first water pump and the third water pump after startup is obtained, and the continuous running time of each water pump is obtained. The power supply monitor monitors the power signals of the first water pump and the third water pump and performs signal processing to obtain power quality data for each water pump. The power quality data includes voltage, current, frequency, three-phase imbalance, and harmonic distortion. The operating temperature data of each water pump is obtained by monitoring the motor bearings and three-phase windings of the first and third water pumps using the temperature transmitter. The operating temperature data includes the motor bearing temperature and the single-phase winding temperature. The system pressure data is obtained by monitoring the inlet valve of the converter valve cooling system and the outlets of the first and third water pumps using a pressure transmitter. The system pressure data includes the system inlet valve pressure and the outlet pressure of each water pump.

3. The method according to claim 2, characterized in that, The step of determining whether the preset switching control conditions are met based on the multi-source monitoring data to obtain the target water pump includes the following steps: The continuous operating time of the first water pump and the third water pump is compared with the preset switching time to determine whether the timed rotation condition is met. The timed rotation condition includes a first sub-condition and a second sub-condition. The timed rotation condition is met when at least one of the first sub-condition and the second sub-condition is met. The first sub-condition is that the continuous operating time of the first water pump is greater than or equal to the preset switching time. The second sub-condition is that the continuous operating time of the third water pump is greater than or equal to the preset switching time. The preset switching time of each water pump is different. The target water pump is determined from the first water pump and the third water pump according to the established timed rotation conditions; When the preset switching control condition occurs, the target water pump is controlled to switch off based on the preset delay pump switching time and the bus relationship, including the following steps: When the aforementioned timed switching condition occurs, the preset delay pump switching time is determined as the first delay; After the first delay, the target water pump is switched to another water pump on the same DC bus.

4. The method according to claim 2, characterized in that, The step of determining whether the preset switching control conditions are met based on the multi-source monitoring data to obtain the target water pump includes the following steps: The power supply failure condition is determined based on the power quality data of the first water pump and the third water pump. The power supply failure condition includes a third sub-condition, a fourth sub-condition, a fifth sub-condition, a sixth sub-condition, and a seventh sub-condition. The power supply failure condition is established when at least one of the third, fourth, fifth, sixth, and seventh sub-conditions is established. The third sub-condition is voltage instability, the fourth sub-condition is current overcurrent, the fifth sub-condition is frequency fluctuation, the sixth sub-condition is three-phase imbalance, and the seventh sub-condition is harmonic distortion. The target water pump is determined from the first water pump and the third water pump based on the established power failure conditions. When the preset switching control condition occurs, the target water pump is controlled to switch off based on the preset delay pump switching time and the bus relationship, including the following steps: When the power failure condition occurs, the preset delay pump switching time is determined as the first delay; After the first delay, the target water pump is switched to another water pump on the same DC bus.

5. The method according to claim 2, characterized in that, The step of determining whether the preset switching control conditions are met based on the multi-source monitoring data to obtain the target water pump includes the following steps: The overheat protection condition is determined based on the operating temperature data of the first water pump and the third water pump. The overheat protection condition includes an eighth sub-condition and a ninth sub-condition. The overheat protection condition is established when at least one of the eighth sub-condition and the ninth sub-condition is established. The eighth sub-condition is that the temperature of the motor bearing is greater than a preset first temperature threshold, and the ninth sub-condition is that the temperature of the single-phase winding is greater than a preset second temperature threshold. The target water pump is determined from the first water pump and the third water pump according to the established overheat protection conditions; When the preset switching control condition occurs, the target water pump is controlled to switch off based on the preset delay pump switching time and the bus relationship, including the following steps: When the overheat protection condition occurs, the preset delay pump-stop time is determined as the first delay; After the first delay, the target water pump is switched to another water pump on the same DC bus.

6. The method according to claim 2, characterized in that, The step of determining whether the preset switching control conditions are met based on the multi-source monitoring data to obtain the target water pump includes the following steps: The system pressure data of the first water pump and the third water pump are used to determine whether the pressure abnormality condition is met. The pressure abnormality condition includes a tenth sub-condition and an eleventh sub-condition. When the tenth sub-condition and the eleventh sub-condition are met at the same time, the pressure abnormality condition is met. The tenth sub-condition is that the system inlet valve pressure is less than a preset first pressure threshold, and the eleventh sub-condition is that the outlet water pressure is less than a preset second pressure threshold. The target water pump is determined from the first water pump and the third water pump based on the established pressure anomaly conditions. When the preset switching control condition occurs, the target water pump is controlled to switch off based on the preset delay pump switching time and the bus relationship, including the following steps: When the aforementioned abnormal pressure condition occurs, the preset delay pump switching time is determined to be the second delay. After the second delay, the target water pump is switched to another water pump on the same DC bus.

7. A control system for multiple pumps operating in parallel, characterized in that, The system includes: The data acquisition module is used to simultaneously start the first water pump and the third water pump, and acquire multi-source monitoring data of the first water pump and the third water pump. The multi-source monitoring data includes the continuous running time, power quality data, operating temperature data and system pressure data of each water pump. The switching judgment module is used to determine whether the preset switching control conditions are met based on the multi-source monitoring data to obtain the target water pump. The preset switching control conditions include timed rotation conditions, power failure conditions, overheat protection conditions, and pressure abnormal conditions. When at least one of the timed rotation conditions, the power failure conditions, the overheat protection conditions, and the pressure abnormal conditions is met, the preset switching control conditions are met. The pump switching control module is used to control the target water pump to switch off based on a preset delay pump switching time and the bus relationship when the preset switching control condition occurs.

8. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method according to any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 6.

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