Power unit replacement method and device and electronic equipment

Abstract

The invention discloses a power unit replacement method and device and electronic equipment, and the method comprises the steps: detecting a plurality of power units in a target frequency converter system, determining a faulted power unit as a to-be-replaced power unit, and controlling the disconnection between a main busbar and the to-be-replaced power unit; when the frequency converter online replacement device is connected to an external power supply and the first terminal and the second terminal are connected to the two sides of the power unit to be replaced, the discharge unit is controlled to be started, and when the residual voltage is reduced to zero, the discharge unit is controlled to be stopped; under the condition that the to-be-replaced power unit is replaced by the target power unit, the boost unit is controlled to be started, and under the condition that the actual voltage rises to the preset voltage, the boost unit is controlled to be stopped; and the control main busbar is connected with the target power unit. Therefore, the residual voltage is safely discharged through the discharging unit, the boosting unit is used for pre-charging, online replacement can be completed without powering off a direct-current busbar, and continuous production is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply and distribution equipment, and in particular to a method, device and electronic device for replacing a power unit. Background Art

[0002] For a frequency converter system during continuous production, if a power unit fails, in order to reduce the potential difference between the new power unit and the DC busbar, the DC busbar is usually de-energized first, and then the power unit is replaced.

[0003] However, de-energizing the DC busbar requires stopping the continuous production line, thus affecting production capacity. Therefore, how to replace the power unit without de-energizing the DC busbar is a technical problem that urgently needs to be solved currently. Summary of the Invention

[0004] Embodiments of the present application provide a method, device and electronic device for replacing a power unit, which solve the technical problem in the prior art that the power unit cannot be replaced without de-energizing the DC busbar, and achieve the technical effect of replacing the power unit without de-energizing the DC busbar.

[0005] In a first aspect, the present application provides a method for replacing a power unit, which is matched with an on-line frequency converter replacement device. The on-line frequency converter replacement device includes a discharge unit and a boost unit. The discharge unit is used to reduce the residual voltage of the power unit to be replaced, and the boost unit is used to increase the actual voltage of the target power unit. The method includes:

[0006] Detect multiple power units in the target frequency converter system, determine the power unit with a fault as the power unit to be replaced, and control the disconnection of the connection between the main busbar of the target frequency converter system and the power unit to be replaced;

[0007] When the on-line frequency converter replacement device is connected to an external power supply and the first terminal and the second terminal of the on-line frequency converter replacement device are connected to both sides of the power unit to be replaced, control the discharge unit to start to reduce the residual voltage, and when the residual voltage is reduced to zero, control the discharge unit to stop;

[0008] When the power unit to be replaced is replaced with the target power unit, control the boost unit to start to increase the actual voltage, and when the actual voltage is increased to a preset voltage, control the boost unit to stop;

[0009] Control the connection between the main busbar and the target power unit to complete the replacement of the power unit in the target frequency converter system.

[0010] In some embodiments of the present application, based on the foregoing solution, before the on-line replacement device of the frequency converter is connected to an external power supply and the first terminal and the second terminal of the on-line replacement device of the frequency converter are connected to both sides of the power unit to be replaced, the method further includes:

[0011] Judge the state of the on-line replacement device of the frequency converter;

[0012] In the case that the on-line replacement device of the frequency converter is not in the initial state, switch the on-line replacement device of the frequency converter to the initial state, and the initial state is used to realize the start and stop of the discharge unit and / or the boost unit.

[0013] In some embodiments of the present application, based on the foregoing solution, during the process of controlling the boost unit to start and increase the actual voltage, the method further includes:

[0014] Control the boost unit to increase the external voltage from the external power supply and output it to the target power unit according to a preset voltage increase rate;

[0015] Monitor the actual voltage of the target power unit, and judge whether the actual rising rate of the actual voltage matches the preset voltage increase rate;

[0016] In the case that the actual rising rate does not match the preset voltage increase rate, control the boost unit to adjust the output voltage until the actual voltage of the target power unit matches the preset voltage increase rate.

[0017] In some embodiments of the present application, based on the foregoing solution, the boost unit further includes an AC voltage regulating component, a voltage transforming component and a rectifying component connected in sequence. The AC voltage regulating component is connected to the external power supply, and the output end of the rectifying component is connected to the first terminal and the second terminal. Controlling the boost unit to start and increase the actual voltage includes;

[0018] Control the AC voltage regulating component to receive the external voltage of the external power supply and output the adjusted AC voltage to be increased to the voltage transforming component;

[0019] Control the voltage transforming component to increase the AC voltage to be increased to the AC voltage to be rectified and output it to the rectifying component;

[0020] Control the rectifying component to convert the AC voltage to be rectified into a target DC voltage and output it to the target power unit, and the target DC voltage matches the actual voltage.

[0021] In some embodiments of the present application, based on the foregoing solution, after controlling the boost unit to stop, during the process of controlling the main busbar to be connected to the target power unit, the method further includes:

[0022] After controlling the boost unit to stop, control the main busbar to be connected to the target power unit within a preset time period.

[0023] In some embodiments of the present application, based on the foregoing solution, before the power unit to be replaced is replaced with the target power unit, the method further includes:

[0024] Obtain the storage duration of the target power unit, and determine the pressure holding strategy according to the storage duration of the target power unit;

[0025] When the first terminal and the second terminal are connected to both sides of the target power unit, control the booster unit to start, and increase the actual voltage of the target power unit according to the pressurization stage and the corresponding pressure holding duration corresponding to the pressure holding strategy;

[0026] When the pressure holding strategy is completed, control the booster unit to stop and control the discharge unit to start;

[0027] When the actual voltage drops to zero, control the connection between the target power unit and the first terminal and the second terminal to be disconnected.

[0028] In some embodiments of the present application, based on the foregoing solution, increasing the actual voltage of the target power unit according to the pressurization stage and the corresponding pressure holding duration corresponding to the pressure holding strategy includes:

[0029] Determine the pressurization amplitude corresponding to the pressurization stage according to the pressure holding strategy and the preset voltage;

[0030] Control the booster unit to increase the actual voltage of the target power unit. When the actual voltage reaches the pressurization amplitude, accumulate the duration during which the target voltage reaches the pressurization amplitude;

[0031] When the duration reaches the pressure holding duration, determine that the pressure holding strategy is completed;

[0032] When there are multiple pressurization stages corresponding to the pressure holding strategy, control the booster unit to increase the actual voltage to the pressurization amplitude corresponding to each pressurization stage in sequence; and when the duration of the actual voltage at each pressurization amplitude reaches the corresponding pressure holding duration, determine that the pressure holding strategy is completed.

[0033] In some embodiments of the present application, based on the foregoing solution, the method further includes:

[0034] Monitor whether the online replacement device of the frequency converter is in an abnormal situation;

[0035] When the online replacement device of the frequency converter is in an abnormal situation, control the discharge unit to stop or control the booster unit to stop; the abnormal situation includes at least one of the following: the temperature inside the online replacement device of the frequency converter is too high, the current is abnormal, and the voltage is abnormal.

[0036] Second aspect, the present application provides a power unit replacement device, which is matched with an on-line replacement device of a frequency converter. The on-line replacement device of the frequency converter includes a discharge unit and a boost unit. The discharge unit is used to reduce the residual voltage of the power unit to be replaced, and the boost unit is used to increase the actual voltage of the target power unit. The power unit replacement device includes:

[0037] A power unit to be replaced determination module, configured to detect multiple power units in the target frequency converter system, determine the faulty power unit as the power unit to be replaced, and control the disconnection of the connection between the main busbar of the target frequency converter system and the power unit to be replaced;

[0038] A discharge unit control module, configured to control the discharge unit to start to reduce the residual voltage when the on-line replacement device of the frequency converter is connected to an external power supply and the first terminal and the second terminal of the on-line replacement device of the frequency converter are connected to both sides of the power unit to be replaced, and control the discharge unit to stop when the residual voltage is reduced to zero;

[0039] A boost unit control module, configured to control the boost unit to start to increase the actual voltage when the power unit to be replaced is replaced with a target power unit, and control the boost unit to stop when the actual voltage is increased to a preset voltage;

[0040] A main busbar connection module, configured to control the connection between the main busbar and the target power unit to complete the replacement of the power unit in the target frequency converter system.

[0041] Third aspect, the present application provides an electronic device, including:

[0042] A processor;

[0043] A memory for storing instructions executable by the processor;

[0044] Wherein, the processor is configured to execute to implement a power unit replacement method as provided in the first aspect.

[0045] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0046] The embodiment of the present application provides a method for replacing a power unit, including: detecting multiple power units in a target frequency converter system, determining the faulty power unit as the power unit to be replaced, and controlling the disconnection of the connection between the main busbar of the target frequency converter system and the power unit to be replaced; when the on-line replacement device for the frequency converter is connected to an external power supply and the first terminal and the second terminal of the on-line replacement device for the frequency converter are connected to both sides of the power unit to be replaced, controlling the discharge unit to start to reduce the residual voltage, and controlling the discharge unit to stop when the residual voltage is reduced to zero; when the power unit to be replaced is replaced with a target power unit, controlling the boost unit to start to increase the actual voltage, and controlling the boost unit to stop when the actual voltage is increased to a preset voltage; controlling the connection between the main busbar and the target power unit to complete the replacement of the power unit in the target frequency converter system. It can be seen that by safely discharging the residual voltage through the discharge unit and using the boost unit for pre-charging, the replacement can be completed online without powering down the DC busbar, accurately controlling the discharge, boosting and grid connection processes, realizing the rapid switching of the power unit, ensuring continuous production, reducing the risk of fast fuse blowing, extending the equipment life, significantly reducing the maintenance cost and downtime loss, and taking into account safety, reliability and economy. Description of the Drawings

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 Schematic structural diagram of an on-line replacement device for a frequency converter provided by an embodiment of the present application

[0049] Figure 2 Schematic circuit diagram of an on-line replacement device for a frequency converter provided by an embodiment of the present application;

[0050] Figure 3 Schematic circuit diagram of a boost unit provided by an embodiment of the present application;

[0051] Figure 4 Schematic circuit diagram of a discharge unit provided by an embodiment of the present application;

[0052] Figure 5 Schematic flow chart of a method for replacing a power unit provided by an embodiment of the present application;

[0053] Figure 6 Schematic structural diagram of a power unit replacement device provided by an embodiment of the present application;

[0054] Figure 7 Schematic diagram of the structure of an electronic device provided by an embodiment of the present application;

[0055] In the above figure: 11, power supply interface; 111, main power switch; 112, main circuit switch; 113, control power supply switch; 114, DC power supply; 12, first terminal; 13, second terminal; 2, discharge unit; 21, resistive load component; 22, current detection component; 23, voltage detection component; 3, boost unit; 31, AC voltage regulation component; 32, transformer component; 33, rectifier component; 4, protection unit; 41, stop switch; 42, relay; 43, indicator light; 44, temperature switch; 45, first resistor; 51, controller; 52, display screen. Specific implementation manners

[0056] By providing a method for replacing a power unit in an embodiment of the present application, the technical problem in the prior art that the power unit cannot be replaced without de-energizing the DC bus is solved.

[0057] The technical solution of the embodiment of the present application for solving the above technical problem is generally as follows:

[0058] An embodiment of the present application provides a method for replacing a power unit, which is matched with an on-line replacement device for a frequency converter. The on-line replacement device for a frequency converter includes a discharge unit and a boost unit. The discharge unit is used to reduce the residual voltage of the power unit to be replaced, and the boost unit is used to increase the actual voltage of the target power unit. The method includes: detecting multiple power units in the target frequency converter system, determining the faulty power unit as the power unit to be replaced, and controlling the disconnection of the connection between the main busbar of the target frequency converter system and the power unit to be replaced; when the on-line replacement device for a frequency converter is connected to an external power supply and the first terminal and the second terminal of the on-line replacement device for a frequency converter are connected to both sides of the power unit to be replaced, controlling the discharge unit to start to reduce the residual voltage, and when the residual voltage is reduced to zero, controlling the discharge unit to stop; when the power unit to be replaced is replaced with a target power unit, controlling the boost unit to start to increase the actual voltage, and when the actual voltage is increased to a preset voltage, controlling the boost unit to stop; controlling the connection between the main busbar and the target power unit to complete the replacement of the power unit in the target frequency converter system. It can be seen that by safely discharging the residual voltage through the discharge unit and using the boost unit for pre-charging, the replacement can be completed online without de-energizing the DC busbar, accurately controlling the discharge, boosting and grid connection processes, realizing the rapid switching of the power unit, ensuring continuous production, reducing the risk of fast fuse melting, extending the equipment life, significantly reducing the maintenance cost and downtime loss, and taking into account safety, reliability and economy.

[0059] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0060] First of all, the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0061] 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 sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0062] It should be noted that, unless otherwise clearly specified and limited, the terms "connected", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the variable frequency drive system of the continuous production line, the AC-DC-AC frequency conversion architecture (such as the Siemens S120 series) is widely used. It converts AC power into DC power through the rectifier unit and transmits it to the DC busbar, and then the parallel power unit obtains the DC power from the busbar and inverts it into AC power to drive multiple motors. Although the failure of a single small power unit (such as brush rollers, squeeze rollers and other auxiliary equipment) will not directly cause the production line to stop, it will cause the process parameters to shift, resulting in a decline in product quality and needs to be replaced in time.

[0064] However, in the prior art, when replacing a power unit, the rectifier must be powered off to completely de-energize the DC busbar. This is because when the capacitor bank inside the power unit is cold and connected to the live busbar, a short-circuit surge current is generated, triggering the fast-fuse protection element to melt and cause secondary damage. This forced power-off operation forces the entire continuous production line to shut down, resulting in huge production capacity losses.

[0065] In order to solve the above problems, an embodiment of the present application provides a power unit replacement method, which is matched with an inverter online replacement device provided in an embodiment of the present application.

[0066] First, the embodiment of the present application first describes the inverter online replacement device.Figure 1 As shown in the figure, it is a schematic structural principle diagram of an on-line replacement device for an inverter provided by an embodiment of the present application, including: a power interface 11, a boosting unit 3, a discharging unit 2, a protection unit 4, a controller 51, a display screen 52, and a first terminal 12 and a second terminal 13.

[0067] Among them, the power interface 11 is used to connect to an external power supply to provide external power input for the entire device. Usually, it is connected to the commercial power (such as 220V AC) and converted into the basic power supply required by the internal circuit of the device.

[0068] The boosting unit 3 is used to boost and rectify the input low-voltage alternating current (such as 220V AC) into a high-voltage direct current (such as 600V DC) that matches the target power unit, so that the target power unit can be safely connected to the DC bus bar and reduce the risk of the fast fuse being blown inside the target power unit.

[0069] As Figure 1 shown, the boosting unit 3 includes an AC voltage regulating component 31, a voltage transforming component 32, and a rectifying component 33 connected in sequence. The AC voltage regulating component 31 controls the output voltage amplitude of the input low-voltage alternating current (such as 220V AC) through phase control or PWM regulation, and can boost the low-voltage alternating current (such as 220V AC) to a high-voltage alternating current (such as 600V AC) in cooperation with the voltage transforming component 32, and then convert the high-voltage alternating current into a high-voltage direct current (such as 600V DC) that matches the target power unit through the rectifying component 33.

[0070] The discharging unit 2 is used to safely release the electrical energy stored in the capacitors inside the power unit to be replaced, reducing the risk of live operation. As Figure 1 shown, the discharging unit 2 includes a resistive load component 21, a current detection component 22, and a voltage detection component 23. Both ends of the resistive load component 21 are connected to the first terminal 12 and the second terminal 13 respectively to form a discharging circuit with the power unit to be replaced, and the residual electrical energy of the power unit to be replaced is consumed through the resistor.

[0071] The current detection component 22 and the voltage detection component 23 are used to detect the output current and output voltage of the on-line replacement device for the inverter, that is, to detect the actual current in the discharging circuit during the discharging process and the actual voltage of the power unit to be replaced, and to detect the output current of the boosting unit 3 and the actual voltage of the target power unit during the charging process.

[0072] The protection unit 4 is used to prevent the on-line replacement device for the inverter and the target power unit from being damaged due to abnormal conditions such as overvoltage, overcurrent, and short circuit during operation. The protection unit 4 includes at least one of an overtemperature protection component, an overvoltage protection component, and an overcurrent protection component.

[0073] The discharge unit 2, the boost unit 3, the protection unit 4, and the display screen 52 are all electrically connected to the controller 51. The controller 51 obtains the detection values of the current detection component 22 and the voltage detection component 23, facilitating the control of the discharge process and the boost process, and capable of controlling the stop of the discharge process or the stop of the boost process when an abnormality is detected.

[0074] The display screen 52 is used to provide a man-machine interaction interface, displaying the operating status (such as voltage, current, fault code), parameter settings, and operation guidance. Further, the display screen can have a touch input function.

[0075] Exemplarily, as Figure 2 shown, it is a schematic circuit diagram of an on-line replacement device for a frequency converter provided by an embodiment of the present application. A main power switch 111 is arranged after the power interface 11 for controlling the start and stop of the on-line replacement device for the frequency converter. After the main power switch 111, it is divided into two branches. One branch is connected to the boost unit through the main circuit switch 112, and a control power switch 113 is arranged on the other branch, and the controller 51 and the display screen 52 are powered by the 24V DC power supply 114.

[0076] As Figure 2 and Figure 3 shown, in the boost unit 3, the AC voltage regulating component 31, the voltage transforming component 32, and the rectifying component 33 are electrically connected in sequence, and the AC voltage regulating component 31 and the rectifying component 33 are electrically connected to the controller 51.

[0077] The M1 output terminal of the rectifying component 33 is connected to the first end of the resistive load component 21 (resistor R2) through the first resistor 45 (resistor R1), and the M2 output terminal of the rectifying component 33 is connected to the second end of the resistive load component 21 through the normally closed contact of the contactor K6. The first resistor 45 is used to limit the output current of the rectifying component 33 and stabilize the high-voltage direct current output by the rectifying component 33, and the coil of the contactor K6 is connected to the controller 51.

[0078] As Figure 2 and Figure 4 shown, both ends of the resistive load component 21 are respectively connected to the first terminal 12 and the second terminal 13 through a normally open contact of the contactor K5. A current detection component 22 is arranged between a normally open contact of the contactor K5 and the normally closed contact of the contactor K6. The coil of the contactor K5 is connected to the controller 51, and the voltage detection component 23 is connected in parallel between the two normally open contacts of the contactor K5 and the first terminal 12 and the second terminal 13.

[0079] In Figure 2Among them, the on-line replacement device for the frequency converter further includes a stop switch 41, a relay 42, an indicator light 43, and a temperature switch 44. When the stop switch 41 is turned on, the boost unit 3 is stopped and the output circuit is cut off. The relay 42 is used to isolate the input of the controller 51, the indicator light 43 is used to indicate the working condition of the boost unit 3, and the temperature switch 44 is used for over-temperature protection of the internal circuit.

[0080] Furthermore, the on-line replacement device for the frequency converter includes a housing, and the housing is set to a shape and size suitable for handling and moving. The power supply interface 11, the discharge unit 2, the boost unit 3, the protection unit 4, and the controller 51 are all arranged inside the housing, and the display screen 52 is embedded in the surface of the housing. The power supply interface 11 is connected to the power cord arranged outside the housing, and the first terminal 12 and the second terminal 13 are respectively led out of the housing by an output cable. The stop switch 41 is selected as a push-button switch and arranged on the outer surface of the housing, and the indicator light 43 is arranged beside the push-button switch.

[0081] After the above description of the on-line replacement device for the frequency converter, the embodiments of the present application will further describe a method for replacing a power unit as follows.

[0082] As Figure 5 shown, it is a schematic flowchart of a method for replacing a power unit provided by an embodiment of the present application, including step S1-step S4.

[0083] Step S1, detect multiple power units in the target frequency converter system, determine the power unit with a fault as the power unit to be replaced, and control the disconnection of the connection between the main busbar of the target frequency converter system and the power unit to be replaced;

[0084] Step S2, when the on-line replacement device for the frequency converter is connected to an external power supply, and the first terminal 12 and the second terminal 13 of the on-line replacement device for the frequency converter are connected to both sides of the power unit to be replaced, control the discharge unit 2 to start to reduce the residual voltage, and when the residual voltage is reduced to zero, control the discharge unit 2 to stop;

[0085] Step S23, when the power unit to be replaced is replaced with a target power unit, control the boost unit 3 to start to increase the actual voltage, and when the actual voltage is increased to a preset voltage, control the boost unit 3 to stop;

[0086] Step S4, control the connection between the main busbar and the target power unit to complete the replacement of the power unit in the target frequency converter system.

[0087] Regarding step S1, detect multiple power units in the target frequency converter system, determine the power unit with a fault as the power unit to be replaced, and control the disconnection of the connection between the main busbar of the target frequency converter system and the power unit to be replaced.

[0088] The target frequency converter system includes multiple power units, which are usually integrated in the system in a parallel or cascaded manner. The power unit is the core module of the frequency converter, responsible for power conversion (such as AC-DC conversion, multi-level output, etc.), and jointly undertakes the load demand.

[0089] During continuous production, the occurrence of faults in some power units will not cause the production line to stop, but will affect product quality. The faults include problems such as abnormal voltage, unstable motor speed, overcurrent and overload, abnormal noise and movement, etc.

[0090] The main busbar is the main power distribution trunk of the target frequency converter system, responsible for distributing the input power supply (DC or AC) to each power unit. Depending on the type of frequency converter, the main busbar may be a DC busbar (such as a voltage source type frequency converter) or an AC busbar (such as a current source type frequency converter). In the following embodiments, the DC busbar is taken as an example to continue introducing the method provided by this application. For example, in the Siemens S120 series, the system structure provides DC voltage for the DC busbar by a rectifying device. The power unit is connected to the DC busbar to obtain direct current, and then outputs alternating current to supply the motor, which is a typical AC-DC-AC frequency conversion system.

[0091] In step S1, disconnecting the connection between the main busbar and the power unit to be replaced means that the power unit to be replaced cannot form a charging circuit in the target frequency converter system.

[0092] Regarding step S2, when the on-line frequency converter replacement device is connected to an external power supply, and the first terminal 12 and the second terminal 13 of the on-line frequency converter replacement device are connected to both sides of the power unit to be replaced, control the discharge unit 2 to start to reduce the residual voltage, and when the residual voltage is reduced to zero, control the discharge unit 2 to stop.

[0093] It should be noted that the external power supply does not belong to the power supply part of the target frequency converter system. After the first terminal 12 and the second terminal 13 are connected to both sides of the power unit to be replaced, it means that at this time, the power unit to be replaced establishes a connection relationship with the on-line frequency converter replacement device and no longer obtains power supply from the target frequency converter system. The power unit to be replaced and the discharge unit 2 form a discharge circuit. Since the power unit to be replaced has a relatively high residual voltage, the current in the discharge circuit flows from the power unit to be replaced to the resistive load component 21 in the discharge unit 2 to consume the residual voltage stored inside the power unit to be replaced.

[0094] During the discharging process, the actual voltage of the power unit to be replaced is collected by the voltage detection component 23 and output to the display screen 52 for display. Until the voltage detection component 23 detects that the residual voltage of the power unit to be replaced is reduced to zero, then control the discharge unit 2 to stop and cut off the discharge circuit between the discharge unit 2 and the power unit to be replaced.

[0095] Exemplarily, as Figure 2 and Figure 4 shown, during the discharging process, the controller 51 controls the contactor K5 to close, making the normally open contact of the contactor K5 closed, and forming a discharging loop between the power unit to be replaced and the resistor load assembly 21 through the normally closed contact of the contactor K6. When the residual voltage monitored by the voltage detection assembly 23 drops to zero, the controller controls the normally open contact of the contactor K5 to open, cutting off the discharging loop.

[0096] Before the on-line replacement device of the frequency converter is connected to an external power supply and the first terminal 12 and the second terminal 13 of the on-line replacement device of the frequency converter are connected to both sides of the power unit to be replaced, the method further includes step S221-step S222.

[0097] Step S21, judging the state of the on-line replacement device of the frequency converter;

[0098] Step S22, when the on-line replacement device of the frequency converter is not in the initial state, switching the on-line replacement device of the frequency converter to the initial state, and the initial state is used to realize the start and stop of the discharging unit 2 and / or the boosting unit 3.

[0099] In step S21-step S22, the state of the on-line replacement device of the frequency converter at least includes the position states of each contactor switch. When the contactor switch is not in the initial position, the contactor switch is switched to the initial position. As Figure 2 shown, the contact switches include: contactor K5, contactor K5, contactor K7 and contactor K8. Taking the contactor K5 as an example, its initial position corresponds to: a normally open contact connected to the load resistor assembly 21, a normally closed contact connected to the relay 42, and a coil position connected to the controller 51.

[0100] Regarding step S3, when the power unit to be replaced is replaced by a target power unit, controlling the boosting unit 3 to start, increasing the actual voltage, and when the actual voltage rises to a preset voltage, controlling the boosting unit 3 to stop. During the process of controlling the boosting unit 3 to start and increasing the actual voltage, the method further includes step S311-step S313.

[0101] Step S311, controlling the boosting unit 3 to increase the external voltage from the external power supply and output it to the target power unit according to a preset boosting rate;

[0102] Step S312, monitoring the actual voltage of the target power unit and judging whether the actual rising rate of the actual voltage matches the preset boosting rate;

[0103] Step S313, when the actual rising rate does not match the preset rising rate, control the booster unit to adjust the output voltage until the actual voltage of the target power unit matches the preset rising rate.

[0104] Regarding step S311, control the booster unit 3 to increase the external voltage from the external power supply according to the preset rising rate and output it to the target power unit.

[0105] As Figure 1 、 Figure 2 and Figure 3 shown, the booster unit 3 includes an AC voltage regulating component 31, a voltage transforming component 32, and a rectifying component 33 connected in sequence. The AC voltage regulating component 31 is connected to the external power supply through the power interface 11, and the M1 output terminal and the M2 output terminal of the rectifying component 33 are connected to the first terminal 12 and the second terminal 13. Controlling the booster unit 3 to start and the process of increasing the actual voltage includes steps S321 - S323.

[0106] Step S321, control the AC voltage regulating component 31 to receive the external voltage of the external power supply and output the adjusted AC voltage to be increased to the voltage transforming component 32;

[0107] Step S322, control the voltage transforming component 32 to increase the AC voltage to be increased to the AC voltage to be rectified and output it to the rectifying component 33;

[0108] Step S323, control the rectifying component 33 to convert the AC voltage to be rectified into the target DC voltage and output it to the target power unit, and the target DC voltage matches the actual voltage.

[0109] Exemplarily, the voltage interface 11 accesses the mains power (220V AC), the AC voltage regulating component 31 adjusts the output voltage amplitude, cooperates with the voltage transforming component 32 to increase the 220V low - voltage AC to 600V high - voltage AC, and then converts the 600V high - voltage AC to 600V high - voltage DC through the rectifying component 33, and the 600V high - voltage DC matches the rated voltage of the target power unit.

[0110] Regarding step S312, monitor the actual voltage of the target power unit and determine whether the actual rising rate of the actual voltage matches the preset rising rate. And regarding step S313, when the actual rising rate does not match the preset rising rate, control the booster unit 3 to adjust the output voltage until the actual voltage of the target power unit matches the preset rising rate.

[0111] Controlling the actual rising rate of the actual voltage of the target power unit to match the preset rising rate is to protect the internal components of the target power unit, effectively reduce the impact of excessive current and voltage on the target power unit, and reduce the occurrence of problems such as fast - fuse fusing.

[0112] Regarding step S3, before the power unit to be replaced is replaced with the target power unit, the method further includes steps S331 to S334.

[0113] Step S331, obtain the storage duration of the target power unit, and determine a pressure holding strategy according to the storage duration of the target power unit;

[0114] Step S332, when the first terminal 12 and the second terminal 13 are connected to both sides of the target power unit, control the booster unit 3 to start, and increase the actual voltage of the target power unit according to the pressurization stage and the corresponding pressure holding duration corresponding to the pressure holding strategy;

[0115] Step S333, when the pressure holding strategy is completed, control the booster unit 3 to stop and control the discharge unit 2 to start;

[0116] Step S334, when the actual voltage drops to zero, control the connection between the target power unit and the first terminal 12 and the second terminal 13 to be disconnected.

[0117] There are large-capacity electrolytic capacitors inside the target power unit. Due to storage and other issues, the activity of the electrolyte inside the capacitor and the performance of the oxide film on the electrode plate will decline over time. After declining to a certain extent, it is prone to explosion and other situations during the power-on process. This is because after power-on, under the action of voltage, the charges in the electrolyte inside the capacitor move to form an electric field, presenting a near-short-circuit state. If the performance of the oxide film on the electrode plate declines, the short-circuit state caused by power-on will be prolonged, generating huge heat energy, thus leading to an explosion.

[0118] Therefore, to reduce the occurrence of such situations, it is necessary to execute steps S331 to S334 to restore the performance of the target power unit before use. At the same time, steps S331 to S334 can also be used for the maintenance of the remaining power units in the storage state.

[0119] Regarding step S331, obtain the storage duration of the target power unit, and determine a pressure holding strategy according to the storage duration of the target power unit.

[0120] Since the storage duration of the target power unit will affect the performance of the electrolytic capacitor inside the target power unit, for the target power unit with a longer storage duration, the corresponding pressure holding strategy requires slower voltage boosting and a longer pressure holding duration.

[0121] Regarding step S332, when the first terminal 12 and the second terminal 13 are connected to both sides of the target power unit, control the booster unit 3 to start, and increase the actual voltage of the target power unit according to the pressurization stage and the corresponding pressure holding duration corresponding to the pressure holding strategy.

[0122] Elevate the actual voltage of the target power unit according to the pressurization stage and corresponding pressure holding duration corresponding to the pressure holding strategy, including steps S3321 - S3324.

[0123] Step S3321: Determine the pressurization amplitude corresponding to the pressurization stage according to the pressure holding strategy and the preset voltage.

[0124] Step S3322: Control the booster unit 3 to elevate the actual voltage of the target power unit. When the actual voltage reaches the pressurization amplitude, accumulate the duration during which the target voltage reaches the pressurization amplitude.

[0125] Step S3323: When the accumulated duration reaches the pressure holding duration, determine that the pressure holding strategy has been completed.

[0126] Step S3324: When there are multiple pressurization stages corresponding to the pressure holding strategy, control the booster unit 3 to sequentially elevate the actual voltage to the pressurization amplitude corresponding to each pressurization stage; and when the duration during which the actual voltage remains at each pressurization amplitude reaches the corresponding pressure holding duration, determine that the pressure holding strategy has been completed.

[0127] Regarding steps S3321 - S3324, by way of example, take the preset voltage as 580V.

[0128] For the target power unit with a storage duration of less than two years, the corresponding pressure holding strategy is: pressurize to 580V in the first stage and hold the pressure for 3600 seconds.

[0129] For the target power unit with a storage duration greater than two years and less than three years, the corresponding pressure holding strategy is: pressurize to 25% of 580V in the first stage, 50% of 580V in the second stage, 75% of 580V in the third stage, and 580V in the fourth stage. The pressure holding duration for each pressurization stage is 1800 seconds.

[0130] For the target power unit with a storage duration greater than three years, the corresponding pressure holding strategy is: pressurize to 25% of 580V in the first stage, 50% of 580V in the second stage, 75% of 580V in the third stage, and 580V in the fourth stage. The pressure holding duration for each pressurization stage is 7200 seconds.

[0131] During the pressurization stage or the pressure holding process, in case of an abnormality, control the booster unit 3 to stop. The abnormal conditions include at least one of voltage abnormality, current abnormality, and temperature abnormality.

[0132] Regarding step S4, control the main busbar to be connected to the target power unit to complete the replacement of the power unit in the target frequency converter system. After controlling the booster unit 3 to stop, during the process of controlling the main busbar to be connected to the target power unit, the method further includes:

[0133] After controlling the boost unit 3 to stop, the main busbar is controlled to be connected to the target power unit within a preset time period.

[0134] After the connection between the target power unit and the frequency converter online replacement device is disconnected and during the process of establishing a connection with the main busbar, if the duration of this process is relatively long, there is a risk of fusing the fast fuse. Therefore, it is necessary to complete the connection within a preset time period, and the preset time period is generally set to 20 seconds.

[0135] During the execution of steps S1 - S4, the method further includes steps S51 - S52.

[0136] Step S51, monitor whether the frequency converter online replacement device is in an abnormal condition;

[0137] Step S52, when the frequency converter online replacement device is in an abnormal condition, control the discharge unit 2 to stop or control the boost unit 3 to stop; the abnormal conditions include at least one of the following: the temperature inside the frequency converter online replacement device is too high, the current is abnormal, and the voltage is abnormal.

[0138] Regarding step S51, the output current and output voltage of the frequency converter online replacement device can be detected by the current detection component 22 and the voltage detection component 23.

[0139] Regarding step S52, the boost unit 3 can be controlled to stop and the output circuit can be cut off by controlling the stop switch 41 to conduct, or the discharge loop of the discharge unit 2 can be cut off by controlling the normally open contact of the contactor K5 to disconnect.

[0140] In summary, the embodiment of the present application provides a method for replacing a power unit, which is matched with an on-line replacement device for a frequency converter. The on-line replacement device for a frequency converter includes a discharge unit 2 and a boost unit 3. The discharge unit 2 is used to reduce the residual voltage of the power unit to be replaced, and the boost unit 3 is used to increase the actual voltage of the target power unit. The method includes: detecting multiple power units in the target frequency converter system, determining the power unit with a fault as the power unit to be replaced, and controlling the disconnection of the connection between the main busbar of the target frequency converter system and the power unit to be replaced; when the on-line replacement device for a frequency converter is connected to an external power supply and the first terminal 12 and the second terminal 13 of the on-line replacement device for a frequency converter are connected to both sides of the power unit to be replaced, controlling the discharge unit 2 to start to reduce the residual voltage, and when the residual voltage is reduced to zero, controlling the discharge unit 2 to stop; when the power unit to be replaced is replaced with the target power unit, controlling the boost unit 3 to start to increase the actual voltage, and when the actual voltage is increased to a preset voltage, controlling the boost unit 3 to stop; controlling the connection between the main busbar and the target power unit to complete the replacement of the power unit in the target frequency converter system. It can be seen that by safely discharging the residual voltage through the discharge unit 2 and using the boost unit 3 for pre-charging, the replacement can be completed online without powering down the DC busbar, accurately controlling the discharge, boosting, and grid connection processes, realizing the rapid switching of the power unit, ensuring continuous production, reducing the risk of fast fuse blowing, extending the equipment life, significantly reducing the maintenance cost and downtime loss, and taking into account safety, reliability, and economy.

[0141] In the actual application process, taking a continuous annealing production line and a tin plating production line as examples, compared with the power unit replacement methods included in the prior art, the power unit replacement method provided by the embodiment of the present application can save 115 - 175 minutes of production time for the continuous annealing production line and 55 minutes of production time for the tin plating production line, and the stronger the continuous production attribute of the production line, the higher the economic benefits it creates.

[0142] Based on the same inventive concept, the present application also provides a Figure 6 power unit replacement device as shown, which is matched with an on-line replacement device for a frequency converter. The on-line replacement device for a frequency converter includes a discharge unit 2 and a boost unit 3. The discharge unit 2 is used to reduce the residual voltage of the power unit to be replaced, and the boost unit 3 is used to increase the actual voltage of the target power unit. The power unit replacement device includes:

[0143] A to-be-replaced power unit determination module 61, configured to detect multiple power units in the target frequency converter system, determine the power unit with a fault as the power unit to be replaced, and control the disconnection of the connection between the main busbar of the target frequency converter system and the power unit to be replaced;

[0144] The discharge unit control module 62 is used to control the discharge unit 2 to start when the on-line replacement device of the frequency converter is connected to an external power supply and the first terminal 12 and the second terminal 13 of the on-line replacement device of the frequency converter are connected to both sides of the power unit to be replaced, so as to reduce the residual voltage, and to control the discharge unit 2 to stop when the residual voltage is reduced to zero;

[0145] The boost unit control module 63 is used to control the boost unit 3 to start when the power unit to be replaced is replaced with a target power unit, so as to increase the actual voltage, and to control the boost unit 3 to stop when the actual voltage rises to a preset voltage;

[0146] The main busbar connection module 64 is used to control the connection between the main busbar and the target power unit to complete the replacement of the power unit in the target frequency converter system.

[0147] Furthermore, the device further includes a status control module, which is used for:

[0148] judging the status of the on-line replacement device of the frequency converter;

[0149] When the on-line replacement device of the frequency converter is not in the initial state, switching the on-line replacement device of the frequency converter to the initial state, and the initial state is used to realize the start and stop of the discharge unit 2 and / or the boost unit 3.

[0150] Furthermore, the device further includes a rate control module, which is used for:

[0151] controlling the boost unit 3 to increase the external voltage from the external power supply and output it to the target power unit according to a preset boost rate;

[0152] monitoring the actual voltage of the target power unit and judging whether the actual rising rate of the actual voltage matches the preset boost rate;

[0153] When the actual rising rate does not match the preset boost rate, controlling the boost unit 3 to adjust the output voltage until the actual voltage of the target power unit matches the preset boost rate.

[0154] Furthermore, the device further includes a boost adjustment module, which is used for:

[0155] controlling the AC voltage regulating component 31 to receive the external voltage of the external power supply and output the adjusted AC voltage to be increased to the voltage transformation component 32;

[0156] controlling the voltage transformation component 32 to increase the AC voltage to be increased to the AC voltage to be rectified and output it to the rectification component 33;

[0157] controlling the rectification component 33 to convert the AC voltage to be rectified into a target DC voltage and output it to the target power unit, and the target DC voltage matches the actual voltage.

[0158] Further, the device further includes a main busbar and target power unit connection module, configured to:

[0159] After controlling the boost unit 3 to stop, control the connection between the main busbar and the target power unit to be completed within a preset duration.

[0160] Further, the device further includes a pressure holding control module, configured to:

[0161] Obtain the storage duration of the target power unit, and determine a pressure holding strategy according to the storage duration of the target power unit;

[0162] When the first terminal 12 and the second terminal 13 are connected to both sides of the target power unit, control the boost unit 3 to start, and increase the actual voltage of the target power unit according to the pressurization stage and the corresponding pressure holding duration corresponding to the pressure holding strategy;

[0163] When the pressure holding strategy is executed and completed, control the boost unit 3 to stop, and control the discharge unit 2 to start;

[0164] When the actual voltage drops to zero, control the connection between the target power unit and the first terminal 12 and the second terminal 13 to be disconnected.

[0165] Further, the device further includes a pressure holding strategy execution module, configured to:

[0166] Determine the pressurization amplitude corresponding to the pressurization stage according to the pressure holding strategy and the preset voltage;

[0167] Control the boost unit 3 to increase the actual voltage of the target power unit. When the actual voltage reaches the pressurization amplitude, accumulate the duration during which the target voltage reaches the pressurization amplitude;

[0168] When the duration reaches the pressure holding duration, determine that the pressure holding strategy is executed and completed;

[0169] When the pressure holding strategy corresponds to multiple pressurization stages, control the boost unit 3 to sequentially increase the actual voltage to the pressurization amplitude corresponding to each pressurization stage; and when the duration of the actual voltage at each pressurization amplitude reaches the corresponding pressure holding duration, determine that the pressure holding strategy is executed and completed.

[0170] Further, the device further includes an abnormal situation control module, configured to:

[0171] Monitor whether the frequency converter online replacement device is in an abnormal situation;

[0172] When the on-line replacement device of the frequency converter is in an abnormal condition, control the discharge unit 2 to stop or control the boost unit 3 to stop; the abnormal conditions include at least one of the following: the temperature inside the on-line replacement device of the frequency converter is too high, the current is abnormal, and the voltage is abnormal.

[0173] Based on the same inventive concept, the present application also provides an electronic device as shown in Figure 7 and includes:

[0174] a processor 71;

[0175] a memory 72 for storing executable instructions of the processor 71;

[0176] wherein, the processor 71 is configured to execute to implement a power unit replacement method as provided above.

[0177] Based on the same inventive concept, the present application also provides a non-transitory computer-readable storage medium. When the instructions in the storage medium are executed by the processor 71 of the electronic device, the electronic device can execute to implement a power unit replacement method as provided above.

[0178] Since the electronic device introduced in this embodiment is the electronic device used to implement the information processing method in the embodiments of the present application, based on the information processing method introduced in the embodiments of the present application, those skilled in the art can understand the specific implementation manners and various variations of the electronic device in this embodiment. Therefore, the implementation of how this electronic device implements the method in the embodiments of the present application will not be described in detail here. As long as the electronic device used by those skilled in the art to implement the information processing method in the embodiments of the present application belongs to the scope of protection of the present application.

[0179] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0180] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general purpose computers, special purpose computers, embedded processors, or other programmable data processing devices to produce a machine, such that the instructions executed by the processors of the computer or other programmable data processing devices generate means for implementing the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0181] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including instruction means that implement the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0182] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0183] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0184] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A method for replacing a power unit, characterized in that, Matched with an on-line replacement device for an inverter, the on-line replacement device for the inverter includes a discharging unit and a boosting unit. The discharging unit is used to reduce the residual voltage of a power unit to be replaced, and the boosting unit is used to increase the actual voltage of a target power unit. The method includes: Detect multiple power units in a target inverter system, determine the power unit with a fault as the power unit to be replaced, and control the disconnection of the connection between the main busbar of the target inverter system and the power unit to be replaced; When the on-line replacement device for the inverter is connected to an external power supply and the first terminal and the second terminal of the on-line replacement device for the inverter are connected to both sides of the power unit to be replaced, control the discharging unit to start to reduce the residual voltage, and when the residual voltage is reduced to zero, control the discharging unit to stop; When the power unit to be replaced is replaced with the target power unit, control the boosting unit to start to increase the actual voltage, and when the actual voltage is increased to a preset voltage, control the boosting unit to stop; Control the connection between the main busbar and the target power unit to complete the replacement of the power unit in the target inverter system.

2. The power unit replacement method according to claim 1, characterized in that Before the on-line replacement device for the inverter is connected to an external power supply and the first terminal and the second terminal of the on-line replacement device for the inverter are connected to both sides of the power unit to be replaced, the method further includes: Judge the state of the on-line replacement device for the inverter; When the on-line replacement device for the inverter is not in the initial state, switch the on-line replacement device for the inverter to the initial state, and the initial state is used to realize the start and stop of the discharging unit and / or the boosting unit.

3. The power unit replacement method according to claim 1, characterized in that, During the process of controlling the boosting unit to start to increase the actual voltage, the method further includes: Control the boosting unit to increase the external voltage from the external power supply according to a preset boosting rate and output it to the target power unit; Monitor the actual voltage of the target power unit and judge whether the actual rising rate of the actual voltage matches the preset boosting rate; When the actual rising rate does not match the preset boosting rate, control the boosting unit to adjust the output voltage until the actual voltage of the target power unit matches the preset boosting rate.

4. The power unit replacement method according to claim 1, characterized in that The boosting unit further includes an AC voltage regulating component, a voltage transforming component and a rectifying component connected in sequence. The AC voltage regulating component is connected to the external power supply, and the output end of the rectifying component is connected to the first terminal and the second terminal. Controlling the boosting unit to start to increase the actual voltage includes; Control the AC voltage regulating component to receive the external voltage of the external power supply and output the adjusted AC voltage to be increased to the voltage transforming component; Control the voltage transforming component to increase the AC voltage to be increased to an AC voltage to be rectified and output it to the rectifying component; Control the rectification component to convert the AC voltage to be rectified into a target DC voltage and output it to the target power unit, where the target DC voltage matches the actual voltage.

5. The power unit replacement method according to claim 1, characterized in that, After controlling the boost unit to stop, during the process of controlling the connection between the main busbar and the target power unit, the method further includes: After controlling the boost unit to stop, control the main busbar to complete the connection with the target power unit within a preset duration.

6. The power unit replacement method according to claim 1, characterized in that, Before the power unit to be replaced is replaced with the target power unit, the method further includes: Obtain the storage duration of the target power unit and determine a pressure-holding strategy according to the storage duration of the target power unit. When the first terminal and the second terminal are connected to both sides of the target power unit, control the boost unit to start, and increase the actual voltage of the target power unit according to the pressurization stage and the corresponding pressure-holding duration corresponding to the pressure-holding strategy. When the pressure-holding strategy is executed completely, control the boost unit to stop and control the discharge unit to start. When the actual voltage drops to zero, control the disconnection of the connection between the target power unit and the first terminal and the second terminal.

7. The power unit replacement method according to claim 6, characterized in that, The step of increasing the actual voltage of the target power unit according to the pressurization stage and the pressure-holding duration corresponding to the pressure-holding strategy includes: Determine the pressurization amplitude corresponding to the pressurization stage according to the pressure-holding strategy and the preset voltage. Control the boost unit to increase the actual voltage of the target power unit. When the actual voltage reaches the pressurization amplitude, accumulate the duration during which the target voltage reaches the pressurization amplitude. When the duration reaches the pressure-holding duration, determine that the pressure-holding strategy is executed completely. When there are multiple pressurization stages corresponding to the pressure-holding strategy, control the boost unit to increase the actual voltage to the pressurization amplitude corresponding to each pressurization stage in sequence; and when the duration of the actual voltage at each pressurization amplitude reaches the corresponding pressure-holding duration, determine that the pressure-holding strategy is executed completely.

8. The power unit replacement method according to claim 1, characterized in that, The method further includes: Monitor whether the frequency converter online replacement device is in an abnormal situation. When the frequency converter online replacement device is in an abnormal situation, control the discharge unit to stop or control the boost unit to stop; the abnormal situation includes at least one of the following: the temperature inside the frequency converter online replacement device is too high, the current is abnormal, and the voltage is abnormal.

9. A power unit replacement device, characterized in that, Matched with the frequency converter online replacement device, the frequency converter online replacement device includes a discharge unit and a boost unit. The discharge unit is used to reduce the residual voltage of the power unit to be replaced, and the boost unit is used to increase the actual voltage of the target power unit. The power unit replacement device includes: A power unit to be replaced determination module, configured to detect multiple power units in the target frequency converter system, determine the power unit with a fault as the power unit to be replaced, and control the disconnection of the connection between the main busbar of the target frequency converter system and the power unit to be replaced. The discharge unit control module is used to control the discharge unit to start when the online replacement device of the frequency converter is connected to an external power supply and the first terminal and the second terminal of the online replacement device of the frequency converter are connected to both sides of the power unit to be replaced, so as to reduce the residual voltage, and to control the discharge unit to stop when the residual voltage is reduced to zero; The boost unit control module is used to control the boost unit to start when the power unit to be replaced is replaced with the target power unit, so as to increase the actual voltage, and to control the boost unit to stop when the actual voltage rises to a preset voltage; The main busbar connection module is used to control the connection of the main busbar to the target power unit to complete the replacement of the power unit in the target frequency converter system.

10. An electronic device, characterized in that, Comprising: A processor; A memory for storing executable instructions of the processor; Wherein, the processor is configured to execute to implement a power unit replacement method according to any one of claims 1 to 8.

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