Method for switching at least two switching devices of a running device and drive system for at least two switching devices in a running device

Abstract

The invention relates to a method for implementing a switchover of a first switching device (17) or at least one second switching device (18, 19) of a running device (20), characterized in that the method comprises the following steps: - a control unit (10) receives a switching signal; - a first switching device (17) or at least a second switching device (18, 19) for the switchover is selected by means of the control unit (10) on the basis of the switching signal; - at least one parameter of the first switching device (17) or of the at least second switching device (18, 19) is called up by the control unit (10); a locking condition is checked for the first switching device (17) or for the at least second switching device (18, 19) by means of the at least one parameter called up; - and when the respective locking condition is fulfilled, the switchover is implemented by means of the selected first switching device (17) or the at least second switching device (18, 19).

Description

TECHNICAL FIELD

[0001] The invention relates to a method for implementing switching of at least two switching devices of a running device.

[0002] The invention also relates to a drive system for at least two switching devices of a running device. BACKGROUND

[0003] German publication DE 102 014 110 732 A1 discloses a load tap changer for switching between winding taps of a step-up transformer, which has a motor drive. A drive shaft is driven by means of the motor drive. The rotary motion of the motor drive is provided via two switchable clutch devices of a first drive shaft assigned to a selector and of a second drive shaft assigned to a load switching switch. The selector and the load switching switch can be switchably configured relative to one another independently of the introduced rotary motion of the motor drive.

[0004] Voltage regulation in energy transmission and energy distribution networks requires the construction of different types of switches in transformers. Usually, a load tap changer is constructed in the transformer, which consists of a load switching switch and a selector and is operated by a common drive. The operation and configuration of the load switching switch are necessarily associated with the selector. Pure adaptation of the operation of the selector or the load switching switch is not possible. SUMMARY

[0005] It is therefore an object of the present invention to describe a method for implementing switching of switching devices of a running device, by which the safety and reliability of the switching devices and the running device are improved.

[0006] The object is solved by a method for implementing switching of a first switching device or at least one second switching device of a running device, which comprises the features of claim 1.

[0007] It is also an object of the present invention to provide a drive system for at least two switching devices of a running device, which improves the safety and reliability of the running device and the switching devices during switching.

[0008] The above object is solved by a drive system for at least two switching devices of a running device, which comprises the features of claim 9.

[0009] The method according to the application is characterized in that the switching of the first switching device or of the at least one second switching device is carried out in the operating device. For this purpose, a control unit receives a switching signal. The control unit is in communication connection with a power device, which is connected to a motor for driving the switching device. The first switching device for the switching is selected by means of the control unit. At least one parameter of the first switching device or of the at least one second switching device is retrieved by the control unit. The locking condition is checked by means of the at least one retrieved parameter for the selected first switching device or for the at least one second switching device. When the respective locking condition is fulfilled, the switching is carried out by means of the selected first switching device or of the selected second switching device.

[0010] For carrying out the switching, the power device is actuated by the control unit. Thereby, the actuation of the selected first switching device or of the selected at least one second switching device can be accomplished. Depending on the carrying out of the switching, the first switching device is actuated via the drive shaft coupled to the first motor. The at least one second switching device is actuated via the drive shaft of the second motor, respectively. Furthermore, the actuation of the selected first switching device and of the selected at least one second switching device can be accomplished.

[0011] The method according to the application is based on the idea that the operating device, for example a transformer, comprises at least one on-load tap changer, which is divided into its individual switching devices or switching device groups. These individual switching devices can be driven separately and individually by their own motor. Before the switching devices in the operating device are actuated or switched and the switching is carried out, a locking condition is checked. For this check, at least one parameter is retrieved. If the retrieved parameter fulfills the locking condition, the switching is carried out.

[0012] The at least one parameter of the first switching device and of the at least one second switching device can be determined, for example, with the aid of a feedback system. Thereby, one feedback system is assigned to the first switching device and a further feedback system is assigned to the at least one second switching device, respectively.

[0013] In an operating device, in particular a transformer, with two switching devices, in particular an on-load tap changer and a selector, it is checked, for example, by a control unit, in which position the selector is. Thus, the parameter for the locking condition to be checked is the position of the selector, which is determined by means of a feedback system of the selector.

[0014] By means of each feedback system assigned to each of the switching devices present, a respective at least one parameter for switching the switching device can be ascertained. The parameter ascertained by means of the feedback system is the attitude or position of the respective switching device. The parameter ascertained by means of the feedback system can also indicate whether the switching device necessary for the selected or determined switching has just been manipulated. If this is the case, the manipulation of the corresponding switching device cannot be carried out. Furthermore, the parameter can be a motion state which indicates whether a switching device has just been manipulated.

[0015] The feedback systems can be designed in different types. The feedback systems can be encoders, multi-turn encoders, single-turn encoders, resolvers, switches, microswitches, sensors, contacts, etc. It is self-evident to the expert that this enumeration of the design possibilities of the feedback systems is not exhaustive.

[0016] The parameters to be called up can be determined arbitrarily or be of arbitrary type. The parameters can be feedback systems on the motors of the respective switching devices, simple safety switches of the operating devices or even customer-specific release buttons. Furthermore, the feedback systems can be part of a control device which counts the switching or stops the time for switching and thereby provides a parameter to be called up for the locking condition. Likewise, the parameters can also be obtained by temperature sensors, for example, assigned to each of the switching devices. Likewise, safety switches can contribute to the parameters which ascertain the locking of the switchgear cabinets assigned to the operating devices. If, for example, a safety switch shows an open switchgear cabinet, the switching is not allowed to be carried out. It is likewise self-evident to the expert that this enumeration of the possible parameters contributing to the ascertaining of the locking condition is not exhaustive.

[0017] The feedback systems serve to determine a parameter necessary for checking the locking condition. The parameter is related to the feedback system. Depending on the design, the parameter is a numerical value, a numerical value range, a simple signal, etc.

[0018] According to a possible embodiment of the application, the switching devices can be combined into switching device groups.

[0019] According to a possible embodiment of the application, the called-up parameters of the first switching device and of the at least second switching device can be analyzed and summarized in the control unit. Depending on the result of the analysis or summary, the control unit can manipulate the first switching device or the first switching device and the at least second switching device as required.

[0020] According to one possible embodiment of the application, a plurality of individual operating devices can be provided. Each of the plurality of operating devices can be equipped with a power unit, each of the power units being controllable by a common control unit. A first group of the plurality of operating devices combines a first group of converting devices. At least a second group of the plurality of operating devices combines at least a second group of converting devices.

[0021] According to the application, a drive system for at least two converting devices of an operating device is disclosed. The drive system comprises a first converting device, which is connected to a first motor via a drive shaft. Furthermore, the drive system comprises at least one second converting device, which is connected to at least one second motor via the drive shaft. A feedback system is provided for each of the first motor and each of the at least one second motor in order to determine at least one parameter of the converting devices. A control unit is in communication with the power units in order to control the first converting device with the first motor and the at least second converting device with the at least one second motor, the control unit determining the at least one parameter, which fulfils a locking condition.

[0022] According to one possible embodiment of the application, the at least one second converting device comprises a second converting device connected to a second motor and a third converting device connected to a third motor.

[0023] The advantage is that each of the converting devices is equipped with its own motor, whereby a safe and reliable drive of the converting devices is achieved compared to the prior art. The drive of all converting devices with one motor, which is coupled to the converting devices via a connecting rod and a clutch, can be dispensed with. Thereby, the possibility of a digital monitoring of the drive system for the operating device is also achieved.

[0024] According to one possible embodiment, the drive system can be provided for a plurality of operating devices. Each of the operating devices is equipped with a power unit. The power units are in communication with the control unit. A first group of the plurality of operating devices combines a first group of converting devices. At least one second group of the plurality of operating devices combines at least one second group of converting devices. Each motor can be equipped with one power unit. However, one power unit can also drive all motors.

[0025] According to one possible embodiment of the application, the at least one second converting device consists of a second converting device and a third converting device. In this case, the second converting device combines a second group of converting devices and the third converting device combines a third group of converting devices.

[0026] According to another possible embodiment of the application, the operating device can be composed of the first conversion device and a plurality of second conversion devices. Each of the further conversion devices is connected to the second motor via the drive shaft, respectively. The second conversion devices are combined into a second conversion device group.

[0027] The control unit and / or the power device can be provided with a memory, respectively. In the memory, determined conversion positions or positions of the conversion devices can be stored, which can be assigned to values for the position of the drive shaft, for example.

[0028] A possible embodiment of the drive system of the application can comprise a first motor, a second motor and a third motor. The motors are driven, for example, via a transmission and a drive shaft. The control device of the drive system comprises a power device, which comprises, for example, an inverter for the controlled or regulated energization of the motors. A control unit is provided for operating the power device. The control unit is connected to the power device, for example, via a bus. The drive system has a plurality of feedback systems, which are functionally assigned to the drive shaft or the respective motor. Each of the feedback systems can be an encoder system. Likewise, an encoder system can be part of a feedback system. The feedback systems or the encoder systems are connected to the power device.

[0029] The control device comprises a control unit and a power device. The power device is used for the energization of the motors. The at least one driving characteristic is stored in a memory of the power device. The control unit selects the driving characteristic, and the power device acts on the motors in accordance with the driving characteristic.

[0030] According to a possible embodiment, the operating device can be a power grid transformer, a transmission transformer or a distribution transformer. The conversion device can be a load transfer switch, a selector, a preselector, a commutator or a double commutator. The parameter for the locked condition can be a position, a location, a state of motion of the load transfer switch, of the selector, of the preselector, of the commutator or of the double commutator. The parameter can be designed as a value or a value range. The parameter can be called up by the control unit or transmitted to the control unit. A plurality of parameters can be combined into one parameter.

[0031] The first conversion device can be configured as a single- or multi-phase load transfer switch. The second conversion device can be configured as a selector, a preselector, a commutator or a double commutator, in particular single- or multi-phase. BRIEF DESCRIPTION OF DRAWINGS

[0032] The application and its advantages are now elucidated by way of example with reference to the accompanying drawings, wherein: - Fig. 1 shows a schematic diagram of a drive system according to the application,

[0033] In the drawings:

[0034] Figure 1 A possible embodiment of a drive system for operating at least one switching device in a device is shown;

[0035] Figure 2 Another embodiment of a drive system for operating at least one switching device in a device is shown;

[0036] Figure 3 Another embodiment of a drive system for operating at least one switching device in a device according to the application is shown, provided with a plurality of operating devices;

[0037] Figure 4 Another possible embodiment of a drive system for operating at least one switching device in a device according to the application is shown;

[0038] Figure 5 A method flow for implementing switching of a switching device in an operating device by means of a drive system according to the application is shown. DETAILED DESCRIPTION

[0039] The same reference numerals are used for identical or identically acting elements of the application. Furthermore, for the sake of clarity, only the reference numerals necessary for describing the respective drawing are shown in the individual drawings.

[0040] Figure 1 An operating device 20 for transmitting energy is shown, which is in particular a transformer. The operating device 20 comprises a first switching device 17 and a second switching device 18. A first motor 12 is connected to the first switching device 17 via a drive shaft 16. A second motor 13 is connected to the second switching device 18 via a drive shaft 16. Although the following description is limited to a transformer as operating device 20 and to a load transfer switch or selector as switching device 17 or 18, this is not to be understood as a limitation of the application.

[0041] In Figure 1 In the described embodiment, the first switching device 17 is configured as a load transfer switch. The second switching device 18 is configured as a selector. The load transfer switch (first switching device 17) is manipulated by means of the first motor 12. The motor 12 has a drive shaft 16, which is connected to the load transfer switch. Furthermore, the motor 12 has a first feedback system 6 with which the position of the first switching device 17 (load transfer switch) can be determined. The selector (second switching device 18) is manipulated via the second motor 13. This second motor 13 is also connected to the selector via a drive shaft 16. A second feedback system 7 of the second motor 13 itself enables determination of the position or tapping position of the selector.

[0042] The control device 2 according to the application comprises a control unit 10, which is connected to the first motor 12 and to the second motor 13 and thus also to the first feedback system 6 and to the second feedback system 7 of the first and of the second switching means 17 and 18 via the functional element 11. The control unit 10 receives signals for the actuation of the first and of the second switching means 17 and 18, i.e. of the load switching switch and of the selector. Furthermore, the different values of the respective feedback systems 6 and 7 are analyzed and summarized in the control unit 10. The control unit 10, the first motor 12 and the second motor 13, the feedback systems 6 and 7 and the functional element 11 form a drive system 3 for the operation of the first switching means 16 or of the second switching means 17 of the device 20.

[0043] The control device 2 obtains switching signals during operation. If, for example, the voltage in the power grid drops, this voltage has to be adapted, for example, by actuating the load switching switch or by actuating the load switching switch and the selector. By using the selector with the respective wiring of the windings of the transformer, the range of the transformer is widened. After obtaining the signal that the voltage has to be changed, it is first determined whether only the load switching switch has to be actuated or whether the load switching switch and the selector have to be actuated in succession. After determining that only the load switching switch has to be actuated, one or more locking conditions are checked / taken up, which are defined between the selector and the load switching switch. For example, the load switching switch is not allowed to be actuated when the selector has just been actuated. The check is carried out in such a way that the second feedback system 7 of the second motor 13 of the second switching means 18 (selector) of the control unit 10 reports the current situation or the transmission parameters. Here, the position or the attitude of the second switching means 18 (selector) is determined and transmitted via the second feedback system 7. Furthermore, the second feedback system 7 reports whether the second switching means 18 (selector) is currently actuated. If the parameters obtained satisfy the locking conditions, the actuation of the load switching switch is carried out. If the locking conditions are not to be satisfied, the load switching switch is not actuated. Alternatively, the actuation of the load switching switch can be waited for until the locking conditions are satisfied, i.e. the selector is in a defined position or is no longer moved. Furthermore, the actuation can be interrupted and / or an error signal can be generated.

[0044] The control device 2 comprises a control unit 10 with a memory 5 and at least one functional element 11 with a memory 5. In the memory 5, for example, the settings of the switching attitude of the first switching means 17 (load switching switch) and of the switching attitude of the second switching means 18 (selector) can be stored. Likewise, in the memory 5, the values for the position of the respective drive shaft 16 can be stored.

[0045] Figure 2Another embodiment of the drive system 3 described for operating at least three switching devices 17, 18 and 19 of the device 20 is shown. In this embodiment, three switching devices 17, 18 and 19 are provided. The first switching device 17 is a load change-over switch. The second switching device 18 is a selector. The third switching device 19 is a preselector. Each of the three switching devices 17, 18 and 19 is respectively operated by its own motor 12, 13 and 14. Each of the three switching devices 17, 18 and 19 is respectively equipped with a feedback system 6, 7, 8. Here, too, different locking conditions can be checked in the control unit 10. For this purpose, the parameters of the feedback systems 6, 7, 8 are retrieved. Thus, for example, in the embodiment described here, when the selector (second switching device 18) and the load change-over switch (first switching device 17) are in a defined position and are not operated, only the operation of the preselector (third switching device 19) can be carried out. For example, only when the on-load tap changer (first switching device 17) and the selector (second switching device 18) are essentially only still connected to the main winding of the transformer (not shown) and the winding (Grobstufe or control winding) whose polarity should be changed by the preselector (third switching device 19) is not switched on, the operation of the preselector (third switching device 19) is allowed.

[0046] Figure 3 Another possible embodiment of the drive system 3 according to the application in the case of three operating devices 20 is shown as in Figure 3 . The three operating devices 20 can in particular be three transformers, whose taps (not shown) are switched on in coordination with the three switching devices 17, 18 and 19 by means of a common control unit 10. The three switching devices 17, 18 and 19 assigned to each of the transformers (operating devices 20) correspond in their function to the embodiments described in Figure 2The three conversion means 17, 18 and 19 are described in detail in the following. After obtaining the conversion signal, it is first checked which of the conversion means 17, 18 and 19 has to be actuated. For this purpose, three conversion means groups 30, 40 and 50 can be formed. Thus, the first conversion means group 30 is formed, for example, by the respective first conversion means 17, i.e. the load transfer switch, in the respective transformer 20. The second conversion means group 40 shows the respective second conversion means 18, i.e. the selector. The third conversion means group 50 shows the respective third conversion means 19, i.e. the preselector 50. Before actuation, it is checked whether the determined conversion means group 30, 40 or 50 fulfils the locking condition. Here, for example, it is checked in which position each individual selector (second conversion means 18) of the three operating means 20 is and whether one of the selectors is moved. The checking of the locking condition takes place by means of the parameters of the respective feedback systems 6, 7 and 8, which are provided in each of the operating means 20 to the respective conversion means 17, 18 and 19. The power means 11 of each drive system 3 provided in each operating means 20 are connected with the only central control unit 10 via a bus 21. By means of the said central control unit 10, the actuation of the respective conversion means 17, 18 and 19 is coordinated and controlled for each of the three operating means 20. As already shown in Figure 2 The power means 11 act on the motors 12, 13 or 14 provided for the respective conversion means 17, 18 and 19.

[0047] Figure 4 Another possible embodiment of the described drive system 3 is shown. In this case, the first conversion means 17 is a load transfer switch, while the further three second conversion means 18 are selectors which are embodied as three-phase. The first conversion means 17 is actuated by the first motor 12 provided for it. The first conversion means 17 is provided with a first feedback system 6. The three second conversion means 18 are each actuated by one own second motor 13 and each have one second feedback system 7. Alternatively, all three selectors can be actuated by one common second motor 7. Here, too, different locking conditions can be checked in the control unit 10 in such a way that the parameters of the first and second feedback systems 6 and 7 are retrieved. The load transfer switch (first conversion means 12) is embodied here as three-phase. The selectors (second conversion means 18) can be combined into one conversion means group 40.

[0048] Figure 5A method according to the application is shown. In this case, the control device 2 contains a switching signal for the manipulation of a load tap changer, which preferably has a first switching means 17 and a second switching means 18, i.e. a load switching switch and a selector. This switching signal can be generated, for example, by manual input in the case of a maintenance operation. Alternatively, the switching signal can be given, for example, by a device for voltage regulation in the case of a voltage drop or rise on the operating means 20, i.e. the transformer. After receiving the switching signal, it is first determined which of the switching means 17 or 18 or both switching means 17 and / or 18 must be manipulated. After the selection of the switching means 17 and 18 to be manipulated, the control unit 10 retrieves at least one parameter. In Figure 1 In the example from, the parameter retrieved is, for example, the position of the selector, i.e. the second switching means 18, which determines the attached second feedback system 7 of the second motor 13. In the control unit 10, at least one locking condition is stored in the memory 5, which can be fulfilled or not fulfilled by the at least one parameter. If the locking condition is fulfilled upon checking, a switching of the first switching means 17, i.e. the load switching switch, takes place. If the locking condition is not fulfilled upon checking, no manipulation, i.e. no switching, of the first switching means 17 takes place. The control unit 10 can then wait until the parameter fulfils the locking condition and then implement the switching. Alternatively, the switching can already be interrupted before the start. Likewise, the triggering of an error signal can be implemented. From Figure 1 Starting from the example from, before the manipulation of the load switching switch (first switching means 17), it is first checked in which position the selector (second switching means 18) is and / or whether the selector has just been moved, i.e. whether it has just been manipulated. When the selector (second switching means 17) has just been manipulated or is, for example, in an inappropriate / forbidden position, the manipulation of the load switching switch (first switching means 17) is not allowed due to the locking condition in this example. The parameter necessary for checking the locking condition is emitted by the second feedback system 7 of the second motor 13 of the selector (second switching means 18). Here, the second feedback system 7 is configured, for example, as a multi-turn encoder, which is directly or indirectly connected to the drive shaft 16 arranged between the second motor 13 and the selector (second switching means 18). The multi-turn encoder then determines the parameter, such as the position of the selector (second switching means 18) by means of the position of the drive shaft 16.

[0049] Depending on the design of the drive system 3, different parameters can be combined with different locking conditions. Thus, as in Figure 2As shown in the embodiments in the figures, the positions (attitudes) of the selector and the preselector (second and third switching devices 18 and 19) are checked before the load transfer switch (first switching device 17) is operated. Alternatively, the locking conditions, i.e. parameters, of the load transfer switch (first switching device 17) and the preselector (third switching device 19) are checked before the selector (second switching device 18) is operated. Here, too, the parameters are retrieved via the respective feedback systems 6 and 8, which are configured as multi-turn encoders.

[0050] The parameters to be retrieved can be arbitrarily determined or of arbitrary type. The parameters can originate from the feedback systems 6, 7 and 8 on the respective motors 12, 13 and 14 of the respective switching devices 17, 18 and 19, from simple safety switches of the operating device 20 or even from customer-specific release buttons.

[0051] The locking conditions define which states must be fulfilled in order not to "lock" or "prevent" the switching. These conditions depend on parameters that are constituted or defined by the attitude or position, the current condition and the motion state of the switching devices 17, 18 and 19.

[0052] The locking conditions can use one or any number of parameters of one or any number of feedback systems 6, 7 and 8.

[0053] The parameters can be, for example, the motion state of the switching device, the position or attitude of the switching device, the position range or attitude range of the switching device, the temperature of the operating device, customer-specific switching signals, safety devices and the like.

[0054] The switching devices can be load transfer switches, selectors, reversers and double reversers. These can be designed as single- or multi-phase.

[0055] List of reference signs

[0056] 2 control device

[0057] 3 drive system

[0058] 5 memory

[0059] 6 first feedback system

[0060] 7 second feedback system

[0061] 8 third feedback system

[0062] 10 control unit

[0063] 11 power piece

[0064] 12 first motor

[0065] 13 Second Motor

[0066] 14 Third Motor

[0067] 16 drive shafts

[0068] 17 First Converter

[0069] 18 Second conversion device

[0070] 19 Third conversion device

[0071] 20 Operating Devices

[0072] 21 bus

[0073] 30 First Converter Group

[0074] 40 Second conversion device group

[0075] 50 Third Converter Group

Claims

1. A method for switching a first switching device (17) or at least one second switching device (18, 19) of an operating device (20), wherein the first switching device is a single-phase or three-phase load transfer switch, and the second switching device is constructed in a single-phase or multi-phase configuration and is accordingly a selector, preselector, commutator, or double commutator, wherein the operating device is a transformer, characterized in that, The method includes the following steps: - The control unit (10) receives the conversion signal; -The control unit (10) selects either the first switching device (17) or the at least one second switching device (18, 19) for switching based on the switching signal; -The control unit (10) retrieves at least one parameter of the first converter (17) or the at least one second converter (18, 19); - The locking condition is checked for the first converter (17) or for the at least one second converter (18, 19) using the retrieved parameter; and When the corresponding locking condition is met, switching is performed by means of the selected first switching device (17) or the at least one second switching device (18, 19). The at least one parameter represents the position and / or motion state of the first conversion device or the at least one second conversion device; and The corresponding locking condition is defined based on the at least one parameter: whether the corresponding switching is prevented in such a way that the switching can occur when the locking condition is met.

2. The method according to claim 1, wherein, The at least one parameter of the first conversion device (17) is determined by means of the first feedback system (6), and the at least one parameter of the at least one second conversion device (18, 19) is determined by means of the second feedback system (7, 8) configured for the at least one second conversion device (18, 19).

3. The method according to claim 2, wherein, The control unit (10) analyzes and summarizes the parameters retrieved by the first converter (17) and / or at least one second converter (18, 19), and the parameters also include: one or more temperatures, customer-specific conversion signals, or the status of safety devices.

4. The method according to claim 2 or 3, wherein, In order to implement the switching, the control unit (10) operates the power unit (11) configured to operate the selected first converter (17) or at least one selected second converter (18, 19), and the power unit (11) operates the first motor (12) connected to the first converter (17) via a drive shaft (16) and the corresponding second motor (13) connected to the at least one second converter (18, 19) via a drive shaft (16) according to the implementation of the switching.

5. The method according to claim 4, wherein, Each feedback system (6, 7, 8) is directly or indirectly connected to the corresponding drive shaft (16) of the conversion device (17, 18, 19).

6. The method according to any one of claims 1 to 3, wherein, The method implements a first converter (17) and a second converter (18, 19) for a plurality of operating devices (20), each of the plurality of operating devices (20) being equipped with a power unit (11) and controlled by the control unit (10), the first converters (17) of the plurality of operating devices (20) being respectively combined into a first converter group (30), and the at least one second converter (18, 19) being respectively combined into at least one second converter group (40, 50).

7. A drive system (3) for at least two switching devices (17, 18, 19) operating a device (20), characterized in that, The drive system has: - First conversion device (17), which is connected to first motor (12) via drive shaft (16); - At least one second conversion device (18, 19), the second conversion device being connected to a second motor (13) via a drive shaft (16); - Each of the first motor (12) and each of the second motors (13) is provided with a feedback system (6, 7, 8) to determine at least one parameter of the conversion device (17, 18, 19); and - A control unit (10), which is communicatively connected to a power unit (11), is configured to operate the first converter (17) with the first motor (12) or the corresponding second converter (18, 19) with the corresponding second motor (13) if a locking condition based on at least one obtained parameter and verified by the control unit (10) is met. The at least one parameter represents the position and / or motion state of the first conversion device or the at least one second conversion device; and The corresponding locking condition is defined based on the at least one parameter: whether the corresponding switching is prevented in such a way that the switching can occur when the locking condition is met.

8. The drive system (3) according to claim 7, wherein, The at least one second conversion device (18, 19) includes a second conversion device (18) connected to a second motor (13) and a third conversion device (19) connected to a third motor (14).

9. The drive system (3) according to claim 7 or 8, wherein, The drive system (3) is provided to a plurality of operating devices (20), each operating device (20) is provided with a power device (11), and the power device (11) is communicatively connected to the control unit (10). The first conversion devices (17) of the plurality of operating devices (20) are combined to form a first conversion device group (30), and the at least one second conversion device (18, 19) of the plurality of operating devices (20) are combined to form at least one second conversion device group (40, 50).

10. The drive system (3) according to claim 9, wherein, Each operating device (20) comprises at least one second conversion device (18, 19) consisting of a second conversion device (18) and a third conversion device (19), wherein the second conversion device (18) is combined to form a second conversion device group (40) and the third conversion device (19) is combined to form a third conversion device group (50).

11. The drive system (3) according to claim 10, wherein, Each of the second converters (18) is connected to the corresponding second motor (13) via the corresponding drive shaft (16), and the second converters (18) are combined to form a second converter group (40).

12. The drive system (3) according to claim 7 or 8, wherein, The control unit (10) and the power unit (11) each include a memory (5).

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