Opening and closing control method, device and equipment of three-phase contactor, medium and product

Abstract

The invention belongs to the technical field of circuit breaker control, and particularly relates to a closing and opening control method, device and equipment of a three-phase contactor, a medium and a product. The method comprises the following steps: for a first phase in a three-phase alternating current of a three-phase contactor, determining a first time difference between the first phase arriving at a preset closing and opening phase angle for the first time and an initial measurement moment according to the preset closing and opening phase angle, and a synchronous phase angle and frequency of the first phase at the initial measurement moment, determining a plurality of closing and opening execution candidate moments of the first phase according to the first time difference, the initial measurement moment, and the closing and opening action compensation duration and frequency of the first phase, and determining a plurality of respective closing and opening execution candidate moments of the second phase and the third phase according to the plurality of closing and opening execution candidate moments of the first phase and the phase difference between the phases, according to the switching-on and switching-off execution candidate moments of the phases, switching-on and switching-off commands of the phases are generated; according to the method, the risks of opening arcing and closing inrush current at the moment of opening and closing are reduced to the maximum extent.

Description

Technical Field

[0001] This application belongs to the technical field of circuit breaker control, and specifically relates to a method, device, equipment, medium and product for controlling the closing and opening of a three-phase contactor. Background Art

[0002] In modern industrial automation and power systems, as a key electrical control component, the three-phase contactor realizes the connection (closing) and disconnection (opening) of the circuit through remote signals, thereby controlling the on-off of motors or other high-power loads in three-phase AC circuits. The traditional random phase-angle closing and opening control technology performs closing and opening operations at any time point within the AC cycle, and it is easy to generate arc during opening and inrush current during closing at the moment of closing and opening, which not only endangers the voltage stability of the system but also reduces the service life of the circuit breaker.

[0003] The prior art proposes a phase-selective closing and opening control method, which controls the three-phase contactor to perform closing and opening actions at a specified phase angle of voltage or current, such as performing closing and opening actions at the current zero-crossing point or the voltage maximum value.

[0004] However, in the existing phase-selective closing and opening control method, the three-phase contactor will synchronously cut off the three-phase circuit according to the control command issued at the specified closing and opening phase angle, and still cannot effectively reduce the risk of arc during opening and inrush current during closing at the moment of closing and opening, affecting the stability of the power system. Summary of the Invention

[0005] This application provides a method, device, equipment, medium and product for controlling the closing and opening of a three-phase contactor, so as to solve the problem that the existing closing and opening control method of the three-phase contactor cannot effectively reduce the risk of arc during opening and inrush current during closing at the moment of closing and opening, affecting the stability of the power system.

[0006] In a first aspect, this application provides a method for controlling the closing and opening of a three-phase contactor, and the method includes:

[0007] Based on the synchronous clock reference coordinate system, for the first phase of the three-phase alternating current of the three-phase contactor, according to the preset closing and opening phase angle, the synchronous phase angle of the first phase at the initial measurement moment, and the current frequency of the three-phase alternating current, determine the first time difference between the first phase first reaching the preset closing and opening phase angle and the initial measurement moment;

[0008] According to the first time difference, the initial measurement moment, the compensation duration of the closing and opening action of the first phase this time, and the current frequency of the three-phase alternating current, determine multiple candidate execution moments for the closing and opening of the first phase this time;

[0009] Determine multiple closing and opening execution candidate times for the second and third phases of the three-phase alternating current respectively according to the multiple closing and opening execution candidate times of the first phase this time and the phase differences between the phases of the three-phase alternating current, and generate closing and opening commands for each phase according to the closing and opening execution candidate times of each phase.

[0010] In some embodiments, the generating closing and opening commands for each phase according to the closing and opening execution candidate times of each phase includes:

[0011] When the difference between the current time and the first closing and opening execution candidate time among the multiple closing and opening execution candidate times of the first phase this time is less than the first threshold, generate the closing and opening command for the first phase;

[0012] At the first closing and opening execution candidate times of the second and third phases respectively after the first closing and opening execution candidate time, generate the closing and opening commands for the second and third phases respectively.

[0013] In some embodiments, the determining multiple closing and opening execution candidate times for the second and third phases of the three-phase alternating current respectively according to the multiple closing and opening execution candidate times of the first phase this time and the phase differences between the phases of the three-phase alternating current includes:

[0014] Determine the second time difference between the first phase and the second phase according to the phase difference between the first phase and the second phase, and determine the third time difference between the first phase and the third phase according to the phase difference between the first phase and the third phase;

[0015] Add the second time difference to each of the multiple closing and opening execution candidate times of the first phase this time to obtain the multiple closing and opening execution candidate times of the second phase;

[0016] Add the third time difference to each of the multiple closing and opening execution candidate times of the first phase this time to obtain the multiple closing and opening execution candidate times of the third phase.

[0017] In some embodiments, before the determining the multiple closing and opening execution candidate times of the first phase this time according to the first time difference, the initial measurement time, the closing and opening action compensation duration of the first phase this time, and the current frequency of the three-phase alternating current, the method further includes:

[0018] Determine the closing and opening action compensation duration of the first phase this time according to the closing and opening action compensation duration of the first phase in the previous time and the actual closing and opening action duration.

[0019] In some embodiments, determining the make-and-break operation compensation duration of the first phase this time according to the make-and-break operation compensation duration of the first phase in the previous time and the actual make-and-break operation duration includes:

[0020] If the absolute value of the difference between the make-and-break operation compensation duration of the first phase in the previous time and the actual make-and-break operation duration is less than or equal to a preset threshold, then determine the make-and-break operation compensation duration of the first phase in the previous time as the make-and-break operation compensation duration of the first phase this time.

[0021] In some embodiments, determining the make-and-break operation compensation duration of the first phase this time according to the make-and-break operation compensation duration of the first phase in the previous time and the actual make-and-break operation duration further includes:

[0022] If the absolute value of the difference between the make-and-break operation compensation duration of the first phase in the previous time and the actual make-and-break operation duration is greater than the preset threshold, then determine the actual make-and-break operation duration of the first phase in the previous time as the make-and-break operation compensation duration of the first phase this time.

[0023] In a second aspect, the present application provides a make-and-break control device for a three-phase contactor, including:

[0024] A processing module, configured to, based on a synchronous clock reference coordinate system, for the first phase of the three-phase alternating current of the three-phase contactor, determine a first time difference between when the first phase first reaches the preset make-and-break phase angle and the initial measurement moment according to the preset make-and-break phase angle, the synchronous phase angle of the first phase at the initial measurement moment, and the current frequency of the three-phase alternating current;

[0025] A determination module, configured to determine multiple make-and-break execution candidate moments of the first phase this time according to the first time difference, the initial measurement moment, the make-and-break operation compensation duration of the first phase this time, and the current frequency of the three-phase alternating current;

[0026] The determination module is further configured to determine multiple make-and-break execution candidate moments of the second phase and the third phase of the three-phase alternating current respectively according to the multiple make-and-break execution candidate moments of the first phase this time and the phase difference between each phase of the three-phase alternating current;

[0027] A generation module, configured to generate make-and-break commands for each phase according to the make-and-break execution candidate moments of each phase.

[0028] In some embodiments, the generation module is further configured to generate a make-and-break command for the first phase when the difference between the current moment and the first make-and-break execution candidate moment among the multiple make-and-break execution candidate moments of the first phase this time is less than a first threshold;

[0029] The generating module is further configured to generate closing and opening commands for the second phase and the third phase respectively at the first closing and opening execution candidate moments of the second phase and the third phase after the first closing and opening execution candidate moment.

[0030] In some embodiments, the determining module is further configured to determine a second time difference between the first phase and the second phase according to the phase difference between the first phase and the second phase, and determine a third time difference between the first phase and the third phase according to the phase difference between the first phase and the third phase;

[0031] The determining module is further configured to add the second time difference to each of the multiple closing and opening execution candidate moments of the first phase this time to obtain the multiple closing and opening execution candidate moments of the second phase;

[0032] The determining module is further configured to add the third time difference to each of the multiple closing and opening execution candidate moments of the first phase this time to obtain the multiple closing and opening execution candidate moments of the third phase.

[0033] In some embodiments, the determining module is further configured to determine the closing and opening action compensation duration of the first phase this time according to the closing and opening action compensation duration of the previous time of the first phase and the actual duration of the closing and opening action.

[0034] In some embodiments, the determining module is further configured to, when the absolute value of the difference between the closing and opening action compensation duration of the previous time of the first phase and the actual duration of the closing and opening action is less than or equal to a preset threshold, determine the closing and opening action compensation duration of the previous time of the first phase as the closing and opening action compensation duration of the first phase this time.

[0035] In some embodiments, the determining module is further configured to, when the absolute value of the difference between the closing and opening action compensation duration of the previous time of the first phase and the actual duration of the closing and opening action is greater than the preset threshold, determine the actual duration of the closing and opening action of the previous time of the first phase as the closing and opening action compensation duration of the first phase this time.

[0036] In a third aspect, the present application provides an electronic device, including: a memory, a processor;

[0037] The memory stores computer execution instructions;

[0038] The processor executes the computer execution instructions stored in the memory, so that the processor executes the closing and opening control method of the three-phase contactor as described in the first aspect and / or various possible implementation manners of the first aspect above.

[0039] Fourthly, the present application provides a computer-readable storage medium storing computer-executable instructions, which are used to implement the on-off control method of the three-phase contactor as described in the first aspect and / or various possible implementation manners of the first aspect when executed by a processor.

[0040] Fifthly, the present application provides a computer program product including a computer program, which implements the on-off control method of the three-phase contactor as described in the first aspect and / or various possible implementation manners of the first aspect when executed by a processor.

[0041] The on-off control method of the three-phase contactor provided by the present application is based on a synchronous clock reference coordinate system. For the first phase of the three-phase alternating current of the three-phase contactor, according to the preset on-off phase angle, the synchronous phase angle of the first phase at the initial measurement moment, and the current frequency of the three-phase alternating current, the first time difference between the first phase reaching the preset on-off phase angle for the first time and the initial measurement moment is determined. According to the first time difference, the initial measurement moment, the on-off action compensation duration of the first phase this time, and the current frequency of the three-phase alternating current, multiple on-off execution candidate moments of the first phase this time are determined. According to the multiple on-off execution candidate moments of the first phase this time and the phase differences between the phases of the three-phase alternating current, multiple on-off execution candidate moments of the second phase and the third phase of the three-phase alternating current are determined respectively, and on-off commands for each phase are generated according to the on-off execution candidate moments of each phase; this method minimizes the risk of arc extinction during opening and inrush current during closing at the moment of on-off, improves the stability of the power system, and improves the stability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0043] Figure 1 Schematic flow chart of the on-off control method of the three-phase contactor provided by the present application Figure 1 ;

[0044] Figure 2 Schematic flow chart of the on-off control method of the three-phase contactor provided by the present application Figure 2 ;

[0045] Figure 3 Schematic structural diagram of the on-off control device of the three-phase contactor provided by the present application;

[0046] Figure 4 Schematic structural diagram of the electronic device provided by the present application.

[0047] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and more detailed descriptions will be provided hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0048] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the scope of protection of the present application.

[0049] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0050] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0051] In the existing phase-selection closing and opening control method, the three-phase contactor is controlled to perform the closing and opening actions at a specified phase angle of voltage or current. For example, the closing and opening actions are performed at the current zero-crossing point or the voltage maximum value. Compared with the traditional random-phase-angle closing and opening control method, the phase-selection closing and opening control method can, to a certain extent, reduce the surge voltage and avoid generating large arcs.

[0052] When the above-mentioned phase-selection closing and opening control method is adopted, the control command issued by the three-phase contactor according to the specified closing and opening phase angle will synchronously cut off the three-phase circuit. In fact, the phase states at which each phase circuit performs the closing and opening actions may be different. Therefore, the risk of arc ignition during opening and closing inrush current during closing and opening cannot still be effectively reduced, which affects the stability of the power system.

[0053] Regarding the above technical problems, the root cause is that there is a phase difference between the three phases in a three-phase alternating current system, which means that at any given point in time, the current waveforms of each phase are different, and they do not reach the zero-crossing point or peak simultaneously. Even if the circuits of all phases perform opening and closing operations at the same point in time, due to the asynchronous current waveforms of each phase, the current states at which each contact in the three-phase contactor actually disconnects or closes may still be different. For example, when a certain phase performs an opening and closing operation at a specified phase angle, and the other phases do not reach that specified phase angle during opening and closing due to the phase difference, a strong arc or inrush current may be generated in that phase.

[0054] In view of this, the present application provides a method for controlling the opening and closing of a three-phase contactor. First, the phase control of single-phase alternating current in the three-phase alternating current is considered. The first-phase voltage and first-phase current at the initial moment are measured to obtain the synchronous phase angle of the first phase. Then, based on this synchronous phase angle, the current frequency, and the set opening and closing phase angle, the duration from the initial moment until the first phase reaches the set opening and closing phase angle for the first time is calculated. Adding this duration to the initial moment can obtain the moment when the first phase first reaches the set opening and closing phase angle. Further, in any electrical cycle of the first phase, the moments when each reaches the set opening and closing phase angle can be obtained. Finally, based on the opening and closing execution moment of the first phase, according to the phase difference between the other phases and the first phase, the opening and closing execution moments of the other two-phase alternating currents can be calculated, so as to generate the opening and closing commands for each phase according to the candidate opening and closing execution moments of each phase; this method realizes the asynchronous control of the three-phase contactor to cut off the three-phase circuit in sequence, thereby minimizing the risk of arcing during opening and the inrush current during closing, and improving the stability of the power system.

[0055] The following uses specific embodiments to elaborate in detail on the technical solution of the present application and how the technical solution of the present application solves the above technical problems. These several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The following will describe the embodiments of the present application in conjunction with the drawings.

[0056] Figure 1 Schematic flow of the method for controlling the opening and closing of a three-phase contactor provided by the embodiments of the present application Figure 1 , the execution subject of this embodiment is, for example, the control module of the three-phase contactor. As Figure 1 shown, the method for controlling the opening and closing of a three-phase contactor provided in this embodiment includes:

[0057] S101. Based on the synchronous clock reference coordinate system, for the first phase of the three-phase alternating current of the three-phase contactor, determine the first time difference between the first arrival of the first phase at the preset switching phase angle and the initial measurement moment according to the preset switching phase angle, the synchronous phase angle of the first phase at the initial measurement moment, and the current frequency of the three-phase alternating current.

[0058] Among them, the first phase refers to any one of the three different-phase alternating current circuits in the three-phase alternating current: phase A, phase B, or phase C. The synchronous clock refers to a high-precision synchronous clock source, such as a GPS synchronous clock or a PTP time server, to ensure that all measurement devices work under the same time reference. A global time reference coordinate system is defined based on the synchronous clock, and all measurement data will be recorded and processed relative to the time points in this coordinate system.

[0059] The preset switching phase angle refers to the target angle preset in the power system to optimize the operation timing of the three-phase contactor for closing or opening operations at a specified phase angle. By presetting the switching phase angle, inrush current can be reduced, arc risk can be lowered, and system stability can be improved; the arc duration and intensity can also be minimized, protecting the contacts and extending the equipment life.

[0060] At the initial measurement moment , synchronously collect the instantaneous values of the voltage and current of the first phase (such as phase A) through an analog-to-digital converter, and calculate the phase difference between the voltage and the current according to the collected instantaneous values of the voltage and the current, then the synchronous phase angle of the first phase at the initial measurement moment can be obtained.

[0061] After that, calculate the first time difference according to the current frequency of the three-phase alternating current, the preset switching phase angle, and the synchronous phase angle of the first phase at the initial measurement moment.

[0062] For example, the following formula can be used to calculate the first time difference between the first arrival of the first phase at the preset switching phase angle and the initial measurement moment:

[0063]

[0064] Among them, is the first time difference, is the preset switching phase angle, is the synchronous phase angle of the first phase at the initial measurement moment, is the current frequency of the three-phase alternating current.

[0065] It can be understood that the relationship between the phase difference and the time difference can be described by a proportional relationship. Therefore, through the above formula, the first phase at The difference between the synchronization phase difference at a moment and the preset closing and opening phase angle is converted into a first time difference, that is, the duration from the initial measurement moment of the first phase until the first time it reaches the preset closing and opening phase angle.

[0066] S102. Determine multiple closing and opening execution candidate moments for this time of the first phase according to the first time difference, the initial measurement moment, the closing and opening action compensation duration for this time of the first phase, and the current frequency of the three-phase alternating current.

[0067] Considering that the closing and opening action duration of the three-phase contactor itself will be affected by various factors, including the manufacturing materials and manufacturing processes of the three-phase contactor itself, the stroke and stroke of the closing and opening iron cores, the mechanical connection conditions, and component oxidation and aging, etc. At the same time, this time is also affected by factors such as grid stability and voltage fluctuations. As a result, the closing and opening action duration is not fixed, and it is difficult to accurately reach the preset closing and opening phase angle according to the sending moment of the three-phase contactor control command. Therefore, the closing and opening action duration used each time when calculating the execution moment of closing and opening is the compensated closing and opening action compensation duration.

[0068] For example, the first closing and opening execution candidate moment for this time of the first phase can be calculated by using the following formula:

[0069]

[0070] Among them, is the first closing and opening execution candidate moment for this time of the first phase, is the initial measurement moment, is the first time difference, is the closing and opening action compensation duration for this time of the first phase.

[0071] Furthermore, the execution candidate moments for multiple times reaching the preset closing and opening phase angle in any electrical cycle n of the first-phase alternating current can be calculated by using the following formula:

[0072]

[0073] Among them, are the multiple closing and opening execution candidate moments for this time of the first phase, is the initial measurement moment, is the first time difference, is the closing and opening action compensation duration for this time of the first phase, is the current frequency of the three-phase alternating current.

[0074] S103. Determine the respective multiple candidate times for closing and opening operations of the second and third phases of the three-phase alternating current based on the multiple candidate times for closing and opening operations of the first phase this time and the phase differences between the phases of the three-phase alternating current, and generate the closing and opening commands for each phase according to the candidate times for closing and opening operations of each phase.

[0075] Among them, there is a certain phase difference between the phases of the three-phase alternating current. For example, when the first phase is the A phase, the second phase is the B phase, and the third phase is the C phase, if the phase difference between the phases is 120 degrees, then the second phase (B phase) lags behind the first phase by 120 degrees, and the third phase (C phase) leads the first phase by 120 degrees.

[0076] It can be understood that according to the phase differences between the phases, the time differences of the second and third phases relative to the first phase can be calculated respectively. For each candidate time for closing and opening operations of the first phase, the candidate times for closing and opening operations of the second and third phases can be determined by adding the corresponding time differences to this time.

[0077] For example, the respective multiple candidate times for closing and opening operations of each phase are: (the first phase), (the second phase) and (the third phase). Generate the corresponding closing and opening commands according to each candidate time for closing and opening operations of each phase, and add them to the command queue of the corresponding phase.

[0078] Based on the synchronous clock reference coordinate system, obtain the current time, traverse the command queue of each phase, check whether the difference between the execution time of the closing and opening command and the current time is within the set error range. If the condition is met, issue the corresponding closing and opening command, and control each phase to perform the closing and opening actions in chronological order to achieve asynchronous control of the three-phase contactors to cut off the three-phase circuit in sequence.

[0079] The on-off control method for a three-phase contactor provided by an embodiment of the present application, based on a synchronous clock reference coordinate system, for the first phase of the three-phase alternating current of the three-phase contactor, determines the first time difference between the first time when the first phase reaches the preset on-off phase angle and the initial measurement moment according to the preset on-off phase angle, the synchronous phase angle of the first phase at the initial measurement moment, and the current frequency of the three-phase alternating current. According to the first time difference, the initial measurement moment, the on-off action compensation duration of the first phase this time, and the current frequency of the three-phase alternating current, determines multiple on-off execution candidate moments of the first phase this time. According to the multiple on-off execution candidate moments of the first phase this time and the phase differences between the phases of the three-phase alternating current, determines the multiple on-off execution candidate moments of the second phase and the third phase of the three-phase alternating current respectively, and generates on-off commands for each phase according to the on-off execution candidate moments of each phase; this method realizes asynchronous control of the three-phase contactor to cut off the three-phase circuit in sequence, so as to minimize the risk of arc generation during opening and inrush current during closing at the moment of on-off, improve the stability of the power system, and improve the stability of the power system.

[0080] Figure 2 Schematic flow of the on-off control method for a three-phase contactor provided by the present application Figure 2 , as Figure 2 shown, on the basis of the Figure 1 embodiment, this embodiment details the on-off control method for a three-phase contactor. The on-off control method for a three-phase contactor provided by this embodiment includes:

[0081] S201. Based on a synchronous clock reference coordinate system, for the first phase of the three-phase alternating current of the three-phase contactor, determine the first time difference between the first time when the first phase reaches the preset on-off phase angle and the initial measurement moment according to the preset on-off phase angle, the synchronous phase angle of the first phase at the initial measurement moment, and the current frequency of the three-phase alternating current.

[0082] Step S201 is similar to the above step S101 and will not be elaborated here.

[0083] S202. Determine the on-off action compensation duration of the first phase this time according to the on-off action compensation duration of the first phase in the previous on-off operation and the actual on-off action duration.

[0084] Among them, the on-off action compensation duration of the first phase in the previous on-off operation refers to the on-off action compensation duration set in the previous time, that is, the on-off action compensation duration used when calculating the on-off execution moment of the first phase in the previous time. The actual on-off action duration refers to the time from receiving the on-off command to actually completing the on-off action during the previous on-off operation of the first phase, that is, the action execution duration of the closing or opening of the three-phase contactor, which includes the coil response time and the mechanical action time.

[0085] In some embodiments, if the absolute value of the difference between the compensation duration of the previous closing and opening operation of the first phase and the actual duration of the closing and opening operation is less than or equal to a preset threshold, the compensation duration of the previous closing and opening operation of the first phase is determined as the compensation duration of the current closing and opening operation of the first phase.

[0086] Wherein, if the compensation duration of the previous closing and opening operation of the first phase is , and the actual duration of the closing and opening operation is , compare with . If the two satisfy , where is the preset threshold duration, there is no need to change the compensation duration.

[0087] It can be understood that by comparing the previous compensation duration with the actual duration, the previous compensation duration can be reused when the error is small, which can ensure the accuracy of the operation while avoiding unnecessary adjustments and maintaining the stability of the system.

[0088] In other embodiments, if the absolute value of the difference between the compensation duration of the previous closing and opening operation of the first phase and the actual duration of the closing and opening operation is greater than the preset threshold, the actual duration of the previous closing and opening operation of the first phase is determined as the compensation duration of the current closing and opening operation of the first phase.

[0089] Wherein, if the compensation duration of the previous closing and opening operation of the first phase is and the actual duration of the closing and opening operation is satisfy: , then the actual duration of the closing and opening operation is used as the compensation duration of the current closing and opening operation of the first phase.

[0090] It can be understood that when the difference exceeds the preset threshold, it indicates that the previous compensation duration is no longer applicable to the current conditions. At this time, using the actual closing and opening operation duration as the new compensation duration can ensure the real-time performance of the system. If the inaccurate compensation duration continues to be used, it may lead to error accumulation and affect the accuracy of subsequent operations. Therefore, by updating the compensation duration in a timely manner, the accuracy of the operation can be maintained.

[0091] Optionally, the compensation duration of the current closing and opening operation of the second phase can also be determined according to the compensation duration of the previous closing and opening operation of the second phase and the actual duration of the closing and opening operation of the second phase, and the compensation duration of the current closing and opening operation of the third phase can be determined according to the compensation duration of the previous closing and opening operation of the third phase and the actual duration of the third closing and opening operation. In this way, when calculating multiple candidate closing and opening execution times of the second phase and multiple candidate closing and opening execution times of the third phase in the subsequent process, the corresponding compensation durations of the current closing and opening operations of each phase can be used for adjustment.

[0092] S203. Determine multiple candidate closing / opening execution times for the current time of the first phase based on the first time difference, the initial measurement time, the compensation duration for the closing / opening operation of the first phase this time, and the current frequency of the three-phase alternating current.

[0093] Step S203 is similar to the above-mentioned step S102 and will not be elaborated here.

[0094] S204. Determine the second time difference between the first phase and the second phase based on the phase difference between the first phase and the second phase, and determine the third time difference between the first phase and the third phase based on the phase difference between the first phase and the third phase.

[0095] For example, through measurement, the frequency of the three-phase alternating current system can be obtained as , and the phase difference between the second phase (phase B) and the first phase (phase A) is , and the phase difference between the third phase (phase C) and the first phase (phase A) is .

[0096] In this way, the time corresponding to each degree can be calculated as: , and further, the second time difference between the first phase and the second phase is: , and the third time difference between the first phase and the third phase is .

[0097] S205. Add the second time difference to each of the multiple candidate closing / opening execution times for the current time of the first phase to obtain multiple candidate closing / opening execution times for the second phase.

[0098] For example, the multiple candidate closing / opening execution times for the second phase can be calculated using the following formula:

[0099]

[0100] where are the multiple candidate closing / opening execution times for the second phase, are the multiple candidate closing / opening execution times for the first phase, is the second time difference, is the electrical cycle, and .

[0101] Optionally, the compensation duration for the closing / opening operation of the second phase this time can also be determined based on the compensation duration for the closing / opening operation of the second phase in the previous time and the actual duration of the closing / opening operation of the second phase, so as to use the determined compensation duration to adjust the compensation duration for the closing / opening operation of the second phase this time.

[0102] S206. Add the third time difference to each of the multiple candidate closing / opening execution times for the current time of the first phase to obtain multiple candidate closing / opening execution times for the third phase.

[0103] For example, the following formula can be used to calculate multiple candidate times for closing and opening operations of the third phase:

[0104]

[0105] Wherein, are multiple candidate times for closing and opening operations of the third phase, are multiple candidate times for closing and opening operations of the first phase, is the second time difference, is the electrical cycle, and .

[0106] Optionally, according to the compensation duration of the previous closing and opening operation of the third phase and the actual duration of the third closing and opening operation, determine the compensation duration of the current closing and opening operation of the third phase, and then use the determined compensation duration to adjust the compensation duration of the current closing and opening operation of the third phase.

[0107] S207. When the difference between the current time and the first candidate time for closing and opening operations of the first phase in the multiple candidate times for closing and opening operations of the first phase this time is less than the first threshold, generate a closing and opening command for the first phase.

[0108] For example, all candidate times for closing and opening operations can be stored in a list, and the list of candidate times is traversed to check the difference between each candidate time and the current time. If the difference is less than the first threshold, generate a closing and opening command and mark this time as processed. According to the requirements of closing and opening control, select the closest candidate time from the multiple first candidate times for closing and opening operations, that is, the first candidate time for closing and opening operations, and then issue a closing and opening command corresponding to the first candidate time for closing and opening operations. The advantage of doing this is to improve the accuracy and timeliness of the closing and opening operation of the first phase.

[0109] S208. At the first candidate time for closing and opening operations of the second phase and the third phase respectively after the first candidate time for closing and opening operations, generate closing and opening commands for the second phase and the third phase respectively.

[0110] For example, by querying the list of candidate times for closing and opening operations of the second phase and the third phase respectively, the first candidate time for closing and opening operations of the second phase and the first candidate time for closing and opening operations of the third phase after the first candidate time for closing and opening operations can be found, and then generate a closing and opening command for the second phase and a closing and opening command for the third phase.

[0111] In the embodiments of the present application, by utilizing the natural phase difference characteristics of three-phase alternating current, according to the closing and opening commands of each phase, asynchronously control the three-phase contactors to cut off the three-phase circuits in sequence, which can maximize the reduction of the possibility of generating arc and inrush current phenomena and improve the stability of the power system.

[0112] The on-off control method of the three-phase contactor provided by the embodiment of the present application determines the on-off action compensation duration of the first phase this time according to the on-off action compensation duration of the previous time of the first phase and the actual on-off action duration, realizes the dynamic adjustment of the on-off action compensation duration, ensures the accuracy of the on-off operation, and determines multiple on-off execution candidate times of the first phase this time according to the first time difference, the initial measurement moment, the on-off action compensation duration of the first phase this time, and the current frequency of the three-phase alternating current. Then, based on the multiple on-off execution candidate times of the first phase this time and the phase differences between the first phase and the second phase and the third phase respectively, the multiple on-off execution candidate times of the second phase and the multiple on-off execution candidate times of the third phase are calculated, and finally the on-off commands for each phase are generated; this method realizes avoiding arcing during opening and inrush current during closing to the greatest extent and improves the stability of the power system.

[0113] Figure 3 It is a schematic structural diagram of the on-off control device of the three-phase contactor provided by the present application, as Figure 3 shown, the on-off control device 300 of the three-phase contactor provided in this embodiment includes:

[0114] A processing module 301, configured to, based on a synchronous clock reference coordinate system, for the first phase of the three-phase alternating current of the three-phase contactor, determine a first time difference between the first time when the first phase reaches the preset on-off phase angle and the initial measurement moment according to the preset on-off phase angle, the synchronous phase angle of the first phase at the initial measurement moment, and the current frequency of the three-phase alternating current;

[0115] A determination module 302, configured to determine multiple on-off execution candidate times of the first phase this time according to the first time difference, the initial measurement moment, the on-off action compensation duration of the first phase this time, and the current frequency of the three-phase alternating current;

[0116] The determination module 302 is further configured to determine multiple on-off execution candidate times of each of the second phase and the third phase of the three-phase alternating current according to the multiple on-off execution candidate times of the first phase this time and the phase differences between the phases of the three-phase alternating current;

[0117] A generation module 303, configured to generate on-off commands for each phase according to the on-off execution candidate times of each phase.

[0118] In some embodiments, the generation module 303 is further configured to generate an on-off command for the first phase when the difference between the current moment and the first on-off execution candidate time among the multiple on-off execution candidate times of the first phase this time is less than a first threshold;

[0119] The generating module 303 is further configured to generate the switching commands for the second phase and the third phase respectively at the first switching execution candidate moments of the second phase and the third phase after the first switching execution candidate moment.

[0120] In some embodiments, the determining module 302 is further configured to determine a second time difference between the first phase and the second phase according to the phase difference between the first phase and the second phase, and determine a third time difference between the first phase and the third phase according to the phase difference between the first phase and the third phase;

[0121] The determining module 302 is further configured to add the second time difference to each of the multiple switching execution candidate moments of the first phase this time to obtain the multiple switching execution candidate moments of the second phase;

[0122] The determining module 302 is further configured to add the third time difference to each of the multiple switching execution candidate moments of the first phase this time to obtain the multiple switching execution candidate moments of the third phase.

[0123] In some embodiments, the determining module 302 is further configured to determine the switching action compensation duration of the first phase this time according to the switching action compensation duration of the previous switching action of the first phase and the actual switching action duration.

[0124] In some embodiments, the determining module 302 is further configured to, when the absolute value of the difference between the switching action compensation duration of the previous switching action of the first phase and the actual switching action duration is less than or equal to a preset threshold, determine the switching action compensation duration of the previous switching action of the first phase as the switching action compensation duration of the first phase this time.

[0125] In some embodiments, the determining module 302 is further configured to, when the absolute value of the difference between the switching action compensation duration of the previous switching action of the first phase and the actual switching action duration is greater than the preset threshold, determine the actual switching action duration of the previous switching action of the first phase as the switching action compensation duration of the first phase this time.

[0126] Figure 4 This is a schematic structural diagram of the electronic device provided by the present application. As Figure 4 shown, the present application provides an electronic device, and the electronic device 400 includes: a receiver 401, a transmitter 402, a processor 403, and a memory 404.

[0127] The receiver 401 is configured to receive instructions and data;

[0128] The transmitter 402 is configured to transmit instructions and data;

[0129] A memory 404 for storing computer-executable instructions;

[0130] A processor 403 for executing the computer-executable instructions stored in the memory 404 to implement each step performed by the on-off control method of the three-phase contactor in the above embodiments. For details, reference can be made to the relevant descriptions in the on-off control method embodiments of the three-phase contactor described above.

[0131] Optionally, the above memory 404 can be either independent or integrated with the processor 403.

[0132] When the memory 404 is independently provided, the electronic device further includes a bus for connecting the memory 404 and the processor 403.

[0133] This application also provides a computer program product, including a computer program which, when executed by a processor, implements the above on-off control method of the three-phase contactor.

[0134] This application also provides a computer-readable storage medium storing computer-executable instructions which, when executed by a processor, implement the above on-off control method of the three-phase contactor.

[0135] Those of ordinary skill in the art will understand that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, and their appropriate combinations. In the hardware implementation, the division of the functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be executed by several physical components in cooperation. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassette, tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that a communication medium typically contains computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0136] After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present application. The present application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0137] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A three-phase contactor closing and opening control method, characterized in that: The method comprises: Based on the synchronous clock reference coordinate system, for a first phase of the three-phase alternating current of the three-phase contactor, according to a preset closing and opening phase angle, a synchronous phase angle of the first phase at an initial measurement moment, and a current frequency of the three-phase alternating current, determine a first time difference between when the first phase first reaches the preset closing and opening phase angle and the initial measurement moment; Determine multiple candidate closing and opening execution times of the first phase this time according to the first time difference, the initial measurement time, the compensation time length of the closing and opening action of the first phase this time, and the current frequency of the three-phase alternating current; Based on the multiple candidate closing and opening execution times of the first phase and the phase difference between the phases of the three-phase AC power, the multiple candidate closing and opening execution times of the second phase and the third phase of the three-phase AC power are determined, and based on the candidate closing and opening execution times of each phase, the closing and opening commands of each phase are generated.

2. The method according to claim 1, characterized in that The generating of the closing and opening commands of each phase according to the candidate closing and opening execution time of each phase comprises: When the difference between the current moment and the first closing / opening execution candidate moment among the multiple closing / opening execution candidate moments of the first phase is less than a first threshold, generating a closing / opening command for the first phase; At the first closing / opening execution candidate time of each of the second phase and the third phase after the first closing / opening execution candidate time, a closing / opening command of each of the second phase and the third phase is generated accordingly.

3. The method according to claim 1, characterized in that The determining, based on the multiple closing and opening execution candidate times of the first phase and the phase difference between the phases of the three-phase alternating current, multiple closing and opening execution candidate times of the second phase and the third phase of the three-phase alternating current, comprises: determining a second time difference between the first phase and the second phase according to the phase difference between the first phase and the second phase, and determining a third time difference between the first phase and the third phase according to the phase difference between the first phase and the third phase; Add the second time difference to the multiple candidate closing and opening execution times of the first phase respectively, to obtain multiple candidate closing and opening execution times of the second phase; The third time difference is added to the multiple candidate closing and opening execution times of the first phase at this time to obtain multiple candidate closing and opening execution times of the third phase.

4. The method according to any one of claims 1 to 3, characterized in that: Before determining multiple candidate closing and opening execution times of the first phase this time according to the first time difference, the initial measurement time, the compensation time length of the closing and opening action of the first phase this time, and the current frequency of the three-phase alternating current, the method further includes: The compensation duration of the closing and opening action of the first phase this time is determined according to the compensation duration of the previous closing and opening action of the first phase and the actual closing and opening action duration.

5. The method according to claim 4, characterized in that Determining the compensation duration of the closing and opening action of the first phase this time according to the compensation duration of the previous closing and opening action of the first phase and the actual closing and opening action duration includes: If the absolute value of the difference between the compensation duration of the previous closing and opening action of the first phase and the actual closing and opening action duration is less than or equal to a preset threshold, the compensation duration of the previous closing and opening action of the first phase is determined as the compensation duration of the current closing and opening action of the first phase.

6. The method according to claim 5, characterized in that The determining the compensation duration of the closing and opening action of the first phase this time according to the compensation duration of the previous closing and opening action of the first phase and the actual closing and opening action duration also includes: If the absolute value of the difference between the compensation duration of the previous closing and opening action of the first phase and the actual duration of the closing and opening action is greater than the preset threshold, the actual duration of the previous closing and opening action of the first phase is determined as the compensation duration of the current closing and opening action of the first phase.

7. A three-phase contactor closing and opening control device, characterized in that: include: A processing module, for determining, based on a synchronous clock reference coordinate system, for a first phase of the three-phase alternating current of the three-phase contactor, a first time difference between when the first phase first reaches the preset closing / opening phase angle and the initial measurement moment according to a preset closing / opening phase angle, a synchronous phase angle of the first phase at the initial measurement moment, and a current frequency of the three-phase alternating current; A determination module, configured to determine a plurality of candidate closing and opening execution times of the first phase this time according to the first time difference, the initial measurement time, the compensation duration of the closing and opening action of the first phase this time, and the current frequency of the three-phase alternating current; The determination module is further configured to determine a plurality of candidate closing and opening execution times for the second phase and the third phase of the three-phase alternating current according to the plurality of candidate closing and opening execution times for the first phase and the phase difference between the phases of the three-phase alternating current; The generation module is used to generate closing and opening commands for each phase according to the candidate closing and opening execution moments of each phase.

8. An electronic device, characterized in that: include: Memory, processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor executes the closing and opening control method of the three-phase contactor according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the closing and opening control method of a three-phase contactor as described in any one of claims 1 to 6.

10. A computer program product, characterized in that The invention comprises a computer program, which, when executed by a processor, implements the closing and opening control method of a three-phase contactor as described in any one of claims 1 to 6.

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