Voltage fluctuation suppression device and method

Abstract

The present invention provides a voltage fluctuation suppression device and method, relating to the technical field of automation equipment. The voltage fluctuation suppression device includes a power input module, a first power module, a second power module, a third power module, and a suppression assembly. The power input module is electrically connected to the first, second, and third power modules. A contactor is provided between the second power module and the power input module. The suppression assembly is electrically connected to the contactor and is used to supply power to the contactor. The voltage fluctuation suppression device and method of the present invention address the technical issues of large footprint and high cost of voltage fluctuation suppression devices in related technologies.

Description

Technical Field

[0001] The present invention relates to the technical field of automation equipment, and in particular to a voltage fluctuation suppression device and method. Background Art

[0002] Voltage fluctuation refers to the change in supply voltage within a power system over a certain period of time. Its main hazards include: increased noise in electrical equipment, loose terminals, insulation aging, control failure, and other faults; voltage fluctuations can also cause production equipment downtime and process control errors, disrupting normal production. To address voltage fluctuations, design measures are often implemented, such as installing power compensation devices like capacitors, inductors, and voltage stabilizers; improving the operation and management of the power system to prevent failures during maintenance; and strengthening voltage monitoring and control to promptly detect and address voltage fluctuations.

[0003] Currently, power system voltage drop design must meet the Semi-F47 voltage drop standard. The standard solution in the industry is to add voltage stabilizers, VSP devices, etc. By adding these devices, the conditions for stable operation of equipment can basically be met during instantaneous voltage drops. However, in actual project applications, this setting is rarely used because the related voltage suppression devices are expensive, which is not conducive to system cost control. In addition, VSP requires a certain amount of space, and some equipment has limited space, resulting in it being impossible to meet the requirements during the design stage. At the same time, the design standard of Semi-F47 is not included in the industry standard specifications. Due to various factors, the voltage suppression part is omitted during the design stage of some equipment.

[0004] Therefore, the prior art needs to be further developed. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and provide a voltage fluctuation suppression device and method to solve the technical problems of large space occupation and high cost of voltage fluctuation suppression devices in related technologies.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: a voltage fluctuation suppression device is provided, including a power input module, a first power module, a second power module, a third power module and a suppression component; the power input module is electrically connected to the first power module, the second power module and the third power module; a contactor is provided between the second power module and the power input module; the suppression component is electrically connected to the contactor, and the suppression component is used to supply power to the contactor.

[0007] Furthermore, the contactor is an AC coil contactor; the suppression component is electrically connected to the third power module, the suppression component is electrically connected to the AC coil contactor, and the third power module is used to supply power to the AC coil contactor.

[0008] Furthermore, the third power-consuming module includes an uninterruptible power supply device, which is used to supply power to the third power-consuming module and to supply power to the AC coil contactor.

[0009] Furthermore, the uninterruptible power supply device is used to supply power to the third power-consuming module.

[0010] Furthermore, the first power module is a switching power supply; the second power module is a power system power device; and the third power module is a control system power device.

[0011] Furthermore, the switching power supply and the power system electrical equipment both have a voltage fluctuation suppression function.

[0012] Furthermore, the contactor is a DC coil contactor; the suppression component is electrically connected to the first power module, the suppression component is electrically connected to the DC coil contactor, and the first power module is used to supply power to the DC coil contactor.

[0013] A voltage fluctuation suppression method is also provided, which uses the voltage fluctuation suppression device as described above. The voltage fluctuation suppression method includes: the power input module powers on the first power module, the second power module and the third power module; the input voltage fluctuation value of the power input module is detected in real time; it is determined whether the input voltage fluctuation value exceeds a preset fluctuation threshold; if so, the suppression component starts to supply power to the contactor.

[0014] Furthermore, the preset fluctuation threshold is specifically: the first power module, the second power module and the third power module maintain for 0.2 seconds when the voltage drops to 50% of the rated voltage; the first power module, the second power module and the third power module maintain for 0.5 seconds when the voltage drops to 70% of the rated voltage; the first power module, the second power module and the third power module maintain for 1 second when the voltage drops to 80%.

[0015] Furthermore, the voltage fluctuation suppression method includes: determining the type of the contactor; if the contactor is a DC coil contactor, the suppression component supplies power to the contactor through a first power module; if the contactor is an AC coil contactor, the suppression component supplies power to the contactor through an uninterruptible power supply device, wherein the uninterruptible power supply device is electrically connected to the third power module.

[0016] Beneficial effects:

[0017] 1. The voltage fluctuation suppression device of the present invention changes the power supply mode of the contactor through a suppression component, replacing voltage fluctuation suppression devices such as VSP that are placed before the contactor. It uses an internal filter and corresponding protection devices to offset the impact of external voltage fluctuations on the weak current system, eliminating the need to install a VSP device in the system, thus solving the technical problems of space occupation and high cost caused by installing a VSP device.

[0018] 2. The voltage fluctuation suppression device of the present invention achieves the replacement and optimization of some functions of the VSP through the component port. The components in the VSP are replaced one by one by the accompanying functions of other components. This solves the problems of space occupation and high cost of the VSP while not affecting the stability of the voltage drop effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is a schematic structural diagram of a voltage fluctuation suppression device used in an embodiment of the present invention;

[0020] Figure 2 1 is a schematic structural diagram of a voltage fluctuation suppression device used in a first embodiment of the present invention;

[0021] Figure 3 2 is a schematic structural diagram of a voltage fluctuation suppression device used in a second embodiment of the present invention;

[0022] Figure 4 is a flow chart of a voltage fluctuation suppression method used in an embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of a voltage fluctuation suppression device used in the prior art;

[0024] Figure 6 2 is a schematic diagram of test results of the power supply side of the voltage fluctuation suppression device used in an embodiment of the present invention when the voltage drop amplitude is 80%;

[0025] Figure 7 2 is a schematic diagram of test results of the load side of the voltage fluctuation suppression device used in an embodiment of the present invention when the voltage drop amplitude is 80%;

[0026] Figure 8 2 is a schematic diagram of test results of the power supply side of the voltage fluctuation suppression device used in an embodiment of the present invention when the voltage drop amplitude is 70%;

[0027] Figure 9 2 is a schematic diagram of test results of the load side of the voltage fluctuation suppression device used in an embodiment of the present invention when the voltage drop amplitude is 70%;

[0028] Figure 102 is a schematic diagram of test results of the power supply side of the voltage fluctuation suppression device used in an embodiment of the present invention when the voltage drop amplitude is 50%;

[0029] Figure 11 3 is a schematic diagram of test results of the load side of the voltage fluctuation suppression device used in an embodiment of the present invention when the voltage drop amplitude is 50%. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0031] According to an embodiment of the present invention, a voltage fluctuation suppression device is provided. Figures 1 to 8 , including a power input module, a first power module, a second power module, a third power module and a suppression component; the power input module is electrically connected to the first power module, the second power module and the third power module; a contactor is provided between the second power module and the power input module; the suppression component is electrically connected to the contactor, and the suppression component is used to supply power to the contactor.

[0032] Using the above configuration, this embodiment divides the power system into three sections and designs a voltage drop function to ensure that the power system meets the semi-F47 standard. Specifically, when the voltage fluctuates, the suppression component can offset the instability and fluctuation of the power input module during power supply, thereby achieving the technical effect of optimizing and replacing the related functions of the VSP. This eliminates the voltage fluctuation suppression device (i.e., VSP) in front of the contactor, achieving a cost-saving effect and solving the technical problem of the large space occupied by the VSP.

[0033] See also Figure 5 In the prior art, a VSP device is usually installed between the power input module and the electrical equipment. By adding the VSP device, the condition that the equipment can still operate stably when the voltage drops momentarily can be basically met.

[0034] In the existing technology, the functions of VSP are mainly:

[0035] 1. Voltage sag / sag detection and response: Able to detect voltage drop events in the power supply network in real time and at high speed.

[0036] 2. Seamless energy injection / compensation: When a voltage sag is detected, the energy stored in the system is instantly injected into the power supply circuit of the protected electrical equipment.

[0037] 3. Dynamic voltage support: During the duration of the voltage sag, by precisely controlling the injected energy, the voltage at the input of the protected equipment is maintained or raised to the level required for its normal operation (for example, maintained above 85% or 90% of the rated voltage).

[0038] VSP functions include:

[0039] 1. Ensure continuous and stable operation of key equipment: The core function is to prevent sensitive electrical equipment from shutting down, tripping, and production interruption due to instantaneous drop in grid voltage.

[0040] 2. Reduce production losses and downtime costs: By avoiding unplanned equipment downtime due to voltage sag, the downtime of the production line is significantly reduced, the scrap rate is reduced, and huge economic losses are avoided.

[0041] 3. Protect equipment from damage: Prevent abnormal operation of equipment caused by voltage sag (such as motor stalling, contactor release, control system logic error) from causing physical or functional damage to the equipment itself, thereby extending the service life of the equipment.

[0042] This embodiment changes the power supply mode of the contactor by suppressing the component, replacing the voltage fluctuation suppression device such as the VSP before the contactor. The internal filter and corresponding protection devices are used to offset the impact of external voltage fluctuations on the weak current system, eliminating the need to install a VSP device in the system. This solves the technical problems of space occupation and high cost caused by the installation of a VSP device.

[0043] In the voltage fluctuation suppression device of this embodiment, the contactor is an AC coil contactor; the suppression component is electrically connected to the third power module, the suppression component is electrically connected to the AC coil contactor, and the third power module is used to supply power to the AC coil contactor.

[0044] Specifically, in this embodiment, the suppression component is used to connect the contactor and the third power module. When the input voltage of the power input module is unstable, power is supplied to the contactor through the third power module, thereby suppressing the voltage fluctuation of the system. The suppression component is used to replace the VSP device in the prior art, so that the voltage fluctuation in the system meets the Semi-F47 standard, which saves the space occupied by the system and saves the cost of installing the VSP device.

[0045] Specifically, the VSP device is a voltage sag protector.

[0046] In the voltage fluctuation suppression device of this embodiment, the third power-consuming module includes an uninterruptible power supply device, which is used to supply power to the third power-consuming module, and the uninterruptible power supply device is used to supply power to the AC coil contactor.

[0047] Preferably, the uninterruptible power supply device is a UPS battery.

[0048] Specifically, in this embodiment, the system uses AC coil contactors for power. When the voltage of AC coil contactors A1 and A2 fluctuates, the contactors frequently engage and disengage, causing the power supply to the power system to be disconnected. This in turn causes the equipment to shut down due to voltage fluctuations. Therefore, in this embodiment, the power supply for AC coil contactors A1 and A2 is provided by a UPS to offset the instability and fluctuation of the voltage in the power supply system. This achieves the technical effect of the VSP device in suppressing voltage fluctuations, enables the equipment to meet the Semi-F47 standard, and ensures stable operation of the equipment.

[0049] In the voltage fluctuation suppression device of this embodiment, the uninterruptible power supply device is used to supply power to the third power-consuming module.

[0050] Example 1:

[0051] See also Figure 2 In this embodiment, the power system uses an AC coil contactor for electricity.

[0052] When the voltage of the AC coil contactors A1 and A2 fluctuates, the contactors will frequently engage and disengage, causing the power supply of the power system to be disconnected, and then causing the equipment to shut down due to voltage fluctuations; therefore, this embodiment combines the UPS originally placed in front of the power system and the UPS used for power consumption of the control system to form a suppression component. The power supply for contactors A1 and A2 is provided by the UPS in the third power module. The suppression component is used to electrically connect the UPS and the AC coil contactor to offset the instability and fluctuation of the voltage in the power supply system. In this way, the suppression component can not only suppress the voltage fluctuations generated by the power input module, but also optimize the unfavorable factors of the UPS at the power input module.

[0053] In the voltage fluctuation suppression device of this embodiment, the first power module is a switching power supply; the second power module is a power system power device; and the third power module is a control system power device.

[0054] Specifically, the first power module is a general power-consuming device, a typical example of which is a switching power supply. The first power module is a key factor in providing 24V power supply to the entire system.

[0055] Preferably, the first power module is a switching power supply with a Semi-F47 function, which can accept voltage fluctuations within a certain range and the output 24V voltage is not affected, thereby ensuring the stable operation of the equipment.

[0056] Specifically, the second power-consuming module is a power system power-consuming device, such as a servo motor, a robot or other actuator.

[0057] Preferably, when the product performance is consistent, priority is given to power system electrical equipment with built-in voltage drop protection function.

[0058] Specifically, the third power module is the power-consuming equipment of the control system, including PLC (programmable logic controller), HMI (touch screen), etc. Among them, the third power module uses a UPS battery pack to protect it to avoid data loss in the event of a complete power outage of the equipment.

[0059] In the voltage fluctuation suppression device of this embodiment, both the switching power supply and the power system electrical equipment have a voltage fluctuation suppression function.

[0060] In the voltage fluctuation suppression device of this embodiment, the contactor is a DC coil contactor; the suppression component is electrically connected to the first power module, and the suppression component is electrically connected to the DC coil contactor, and the first power module is used to supply power to the DC coil contactor.

[0061] Example 2:

[0062] See also Figure 3 In this embodiment, the contactor is a DC coil contactor, and the suppression component in this embodiment is used to connect the first power module and the DC coil contactor.

[0063] In this embodiment, the coil of the contactor is powered by the first power module, and the first power module is an output device that meets the voltage drop standard. When the power supply system fluctuates, the first power module that meets the voltage drop standard and the DC coil contactor can offset the impact of the voltage drop to the maximum extent. Therefore, the DC coil contactor coil will not experience voltage instability. Therefore, the suppression component of this embodiment can offset the instability and fluctuation of the voltage in the power supply system, thereby achieving the effect of suppressing voltage fluctuations.

[0064] In this way, through the design and matching of the power system in this embodiment, the relevant functions of optimizing and replacing the VSP can be achieved. Among them, the switching power supply of the first power-consuming module is a switching power supply with a Semi-F47 function, which uses its internal filter and corresponding protection devices (overvoltage, undervoltage, etc.) to offset the impact of external voltage fluctuations on the weak current system. When the power supply voltage fluctuates, that is, AC-DC fluctuates, the corresponding PWM (pulse width modulation) controller and its related protection functions take effect, suppressing and compensating for the fluctuations generated by the power grid, thereby achieving voltage stability from the component end.

[0065] This embodiment also provides a method for suppressing voltage fluctuations. Figure 4 , using the voltage fluctuation suppression device as described in any one of the above items, the voltage fluctuation suppression method includes:

[0066] S100: The power input module supplies power to the first power-consuming module, the second power-consuming module, and the third power-consuming module;

[0067] S200 detects the input voltage fluctuation value of the power input module in real time;

[0068] S300 determines whether the input voltage fluctuation value exceeds a preset fluctuation threshold;

[0069] If yes in S400 , the suppression component starts to supply power to the contactor.

[0070] By adopting the above method, the power supply mode of the contactor is changed by setting a suppression component, so that the voltage fluctuation of the contactor is within the preset fluctuation threshold. In this way, the voltage fluctuation of the system can meet the Semi-F47 standard without the need for additional VSP devices, thus solving the technical problems of large space and high cost of voltage fluctuation suppression devices in the prior art.

[0071] In the voltage fluctuation suppression method of this embodiment, the preset fluctuation threshold is specifically: the first power module, the second power module and the third power module maintain the voltage for 0.2 seconds when the voltage drops to 50% of the rated voltage; the first power module, the second power module and the third power module maintain the voltage for 0.5 seconds when the voltage drops to 70% of the rated voltage; the first power module, the second power module and the third power module maintain the voltage for 1 second when the voltage drops to 80%.

[0072] In the voltage fluctuation suppression method of this embodiment, the voltage fluctuation suppression method includes:

[0073] S410 determines the type of the contactor;

[0074] S420: If the contactor is a DC coil contactor, the suppression component supplies power to the contactor via the first power module;

[0075] S430: If the contactor is an AC coil contactor, the suppression component supplies power to the contactor via an uninterruptible power supply device, wherein the uninterruptible power supply device is electrically connected to the third power module.

[0076] Specifically, when the contactor is an AC coil contactor, fluctuations in the voltage of the AC coil contactors A1 and A2 will cause the contactors to frequently engage and disengage, thereby causing the power supply of the power system to be disconnected, and ultimately causing the equipment to shut down due to voltage fluctuations; at this time, switching the power supply of contactors A1 and A2 to the UPS battery can offset the instability and fluctuation of the voltage in the power supply system. In addition, this embodiment can also optimize the unfavorable factors of the UPS at the power input module by merging the original UPS in front of the power system with the UPS used for power consumption of the control system.

[0077] When the contactor is a DC coil contactor, this embodiment uses a first power module to power the DC coil contactor, and powers the coil of the DC coil contactor through a 24V switching power supply that meets the Semi-F47 standard. In this way, when the power supply system fluctuates, the impact of the voltage drop can be offset to the maximum extent, and the DC coil contactor will not become unstable, thereby offsetting the instability and fluctuation of the voltage in the power supply system.

[0078] In this way, the relevant functions of optimizing and replacing VSP can be achieved through the design and matching of the power system. The switching power supply that meets the Semi-F47 standard uses internal filters and corresponding protection devices (overvoltage, undervoltage, etc.) to offset the impact of external voltage fluctuations on the weak current system. When the supply voltage fluctuates, that is, when the AC-DC fluctuates, the corresponding PWM controller and its related protection functions take effect, suppressing and compensating for the fluctuations generated by the power grid, and achieving voltage stability from the component end.

[0079] In specific practice, the voltage fluctuation suppression device of this embodiment was tested, and the testing method included:

[0080] Connect a voltage drop tester (VSS) in series to the device power supply circuit (R\S\T). Connect the output of the voltage drop tester to the device power supply circuit, and then perform a voltage drop function fluctuation test on the voltage drop tester.

[0081] Specifically, referring to Table 1, for the phases L / N, L / PE, N / PE, R / PE, S / PE, T / PE, R / S, S / T, and R / T, the voltage drops are 80%, 70%, and 50% at intervals of 10 seconds, respectively. Check the stability of the equipment during operation. If the equipment still operates normally and stably during the test, it means the result passes.

[0082] Table 1: Voltage fluctuation suppression device test results

[0083] Voltage drop Voltage drop time 50% 0.2s 70% 0.5s 80% 1s

[0084] In the performance test of the voltage fluctuation suppression device of this embodiment, the test standard adopts SEMI F47-0706 "Specification for Semiconductor Processing Equipment Voltage Sag Immunity"

[0085] Test equipment includes a programmable voltage sag generator (must meet IEC 61000-4-34 Class 2 accuracy) and a power quality analyzer (accuracy ≥ Class A, compliant with IEC61000-4-30)

[0086] The test environment is when the equipment is operating at rated load (such as actual working conditions such as wafer processing and transmission), with an ambient temperature of 25°C ±5°C (in compliance with SEMI S2 environmental requirements).

[0087] Table 2: Test results with a voltage drop of 50%

[0088]

[0089] Table 3: Test results with a voltage drop of 70%

[0090]

[0091] Table 4: Test results with a voltage drop of 80%

[0092]

[0093] See also Figures 6-11 As shown in Tables 2 to 4, the test results show that the circuit system of this embodiment passes the test when the voltage drop amplitude is 50%, 70% and 80%. Therefore, this setting can meet the Semi-F47 voltage drop test index.

[0094] Specifically, if Figure 6As shown, the input voltage waveform of the machine-side phase L1-L2 power supply side has a residual voltage variation of 80%, a phase advance of 0°, and a power supply time that fluctuates continuously for 1000ms. The gap maintains the maximum voltage continuously to 300V to supply the equipment load end.

[0095] like Figure 7 As shown, the load side of the machine phase L1-L2 has a residual voltage variation of 80%, a phase lead of 0°, and a test time of 1000ms. The voltage waveform fed back by the device shows that regardless of input voltage fluctuations, the voltage at the load port can still be maintained at around 208V for stable operation. The final test result is judged as Pass (stable operation).

[0096] like Figure 8 As shown, the input voltage waveform of the machine-side phase L1-L2 power supply side has a residual voltage variation of 70%, a phase advance of 0°, and a power supply time that fluctuates continuously for 500ms. The gap maintains the maximum voltage continuously to 300V to supply the equipment load end.

[0097] like Figure 9 As shown, the load side of the machine phase L1-L2 has a residual voltage variation of 70%, a phase lead of 0°, and a test time of 500ms. The voltage waveform fed back by the device shows that regardless of input voltage fluctuations, the voltage at the load port can still be maintained at around 208V for stable operation. The final test result is judged as Pass (stable operation).

[0098] like Figure 10 As shown, the input voltage waveform of the machine-side phase L1-L2 power supply side has a residual voltage variation of 50%, a phase advance of 0°, and a power supply time that fluctuates continuously for 200ms. The maximum voltage is maintained at 300V during the gap to supply the equipment load end.

[0099] like Figure 11 As shown, the load side of the machine phase L1-L2 has a residual voltage variation of 50%, a phase lead of 0°, and a test time of 200ms. The voltage waveform fed back by the device shows that regardless of input voltage fluctuations, the load port can still maintain stable operation of the device. The final test result is judged as Pass (stable operation).

[0100] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0101] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0102] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0103] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0104] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A voltage fluctuation suppression device, characterized in that: It includes a power input module, a first power module, a second power module, a third power module and a suppression component; The power input module is electrically connected to the first power module, the second power module and the third power module; A contactor is provided between the second power module and the power input module; The suppression assembly is electrically connected to the contactor, and the suppression assembly is used to supply power to the contactor. The contactor is an AC coil contactor, and the suppression assembly is used to connect the AC coil contactor and the third power module, and the third power module is used to supply power to the AC coil contactor. Alternatively, the contactor is a DC coil contactor, the suppression component is used to connect the first power module and the DC coil contactor, and the first power module is used to supply power to the DC coil contactor.

2. The voltage fluctuation suppression device according to claim 1, wherein: The contactor is an AC coil contactor; The suppression component is electrically connected to the third power-consuming module, and the suppression component is electrically connected to the AC coil contactor.

3. The voltage fluctuation suppression device according to claim 2, characterized in that: The third power-consuming module includes an uninterruptible power supply device, which is used to supply power to the third power-consuming module and to supply power to the AC coil contactor.

4. The voltage fluctuation suppression device according to claim 3, characterized in that: The uninterruptible power supply device is used to supply power to the third power-consuming module.

5. The voltage fluctuation suppression device according to claim 2, wherein: The first power module is a switching power supply; the second power module is a power system power device; and the third power module is a control system power device.

6. The voltage fluctuation suppression device according to claim 5, characterized in that: The switching power supply and the power system electrical equipment both have a voltage fluctuation suppression function.

7. The voltage fluctuation suppression device according to claim 1, wherein: The contactor is a DC coil contactor; The suppression component is electrically connected to the first power module, and the suppression component is electrically connected to the DC coil contactor.

8. A method for suppressing voltage fluctuations, using the voltage fluctuation suppression device according to any one of claims 1 to 7, characterized in that: The voltage fluctuation suppression method comprises: The power input module supplies power to the first power module, the second power module and the third power module; Real-time detection of the input voltage fluctuation value of the power input module; Determining whether the input voltage fluctuation value exceeds a preset fluctuation threshold; If so, the suppression assembly begins to supply power to the contactor.

9. The voltage fluctuation suppression method according to claim 8, characterized in that: The preset fluctuation threshold is specifically: The first power module, the second power module and the third power module maintain the voltage for 0.2 seconds when the voltage drops to 50% of the rated voltage; The first power module, the second power module and the third power module maintain the voltage for 0.5 seconds when the voltage drops to 70% of the rated voltage; The first power module, the second power module, and the third power module maintain voltage for 1 second when the voltage drops to 80%.

10. The voltage fluctuation suppression method according to claim 9, characterized in that: The voltage fluctuation suppression method comprises: Determine the type of contactor; If the contactor is a DC coil contactor, the suppression component supplies power to the contactor via the first power module; If the contactor is an AC coil contactor, the suppression component supplies power to the contactor via an uninterruptible power supply device, wherein the uninterruptible power supply device is electrically connected to the third power module.

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