CN111146933B - Online maintenance device, cascading type variable flow system and online maintenance method thereof - Google Patents
Online maintenance device, cascading type variable flow system and online maintenance method thereof Download PDFInfo
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- CN111146933B CN111146933B CN202010065325.3A CN202010065325A CN111146933B CN 111146933 B CN111146933 B CN 111146933B CN 202010065325 A CN202010065325 A CN 202010065325A CN 111146933 B CN111146933 B CN 111146933B
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- 238000012423 maintenance Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000002955 isolation Methods 0.000 claims abstract description 55
- 230000009466 transformation Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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Abstract
The application discloses an online maintenance device, a cascading type variable flow system and an online maintenance method thereof. The on-line maintenance device is used for the cascading converter system and is arranged between the alternating current side of the cascading converter system and the power module, and comprises a bypass module, an isolation module, a control module and an access module; when the operation of the cascade type converter system fails, the on-line maintenance device controls each module according to the control information received by the control module, so that the power module can be maintained on line in the operation of the converter system, or a redundant power module is accessed through controlling the access module, the whole maintenance process does not need system shutdown, the new power module can be effectively prevented from failing, and the operation efficiency and reliability of the system are ensured.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to an online maintenance device, a cascading type converter system and an online maintenance method thereof.
Background
The power module in the cascade converter system is often provided with a bypass module, and when the power module fails, the system controls the bypass module to bypass the failed power module, so that the bypass function of the power module is realized. The system can continue to operate under the condition of lacking one or more stages of power modules, and the power modules are replaced and maintained after stopping at a proper time.
However, in the case of a cascaded converter system lacking one or more power modules, the cascaded converter system needs to be derated or the power modules are overloaded, so that a new power module is easy to fail for a long time, and when the new power module fails, the cascaded converter system can only be shut down for system maintenance, thus causing great loss to practical application.
Disclosure of Invention
In view of the above, the present application proposes an online maintenance device, a cascaded converter system and an online maintenance method thereof, so as to solve or partially solve the above problems.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
The invention discloses an on-line maintenance device which is used for a cascading converter system and is arranged between an alternating current side of the cascading converter system and a power module, wherein the on-line maintenance device comprises a bypass module, an isolation module and a control module;
The bypass module is electrically connected with the isolation module and is arranged on a connecting passage of the alternating current side and the power module; the control module is respectively connected with the bypass module and the isolation module and is used for receiving and sending instructions to control the bypass module and the isolation module;
the bypass module comprises a first switch, a second switch and a first switch, wherein the first switch is arranged between the alternating current side and a wire of a connecting channel of the power module and is used for cutting off the connection between the alternating current side and the power module; the isolation module comprises a second switch which is arranged on a wire of a connecting passage of the alternating current side and the power module and is used for isolating the alternating current side and the power module.
Further, the online maintenance device further comprises an access module;
one end of the access module is connected with the alternating current side through the bypass module, the other end of the access module is connected with the redundant power module, and the control module is connected with the access module and is used for receiving and sending instructions to control the access module;
The access module comprises a third switch which is arranged on a wire connected with the alternating current side; and the third switch is used for controlling the redundant power module to be connected into the alternating current loop.
Further, the first switch, the second switch and the third switch are manual control devices or automatic control devices.
Further, the manual control device is any one of the following: a manual circuit breaker, a manual contactor, an isolating knife switch and a manual quick connector; the automatic control device is any one of the following: electronic switch, electronic contactor, electronic circuit breaker.
The invention further discloses a cascading type current transformation system, which comprises three-phase cascading branches and a control system, wherein each cascading branch is formed by connecting a plurality of power modules in series on an alternating current side, the alternating current side of each power module is connected with any one of the online maintenance devices, and the direct current side of each power module is connected with the direct current device; the control system is used for controlling the online maintenance device to work.
Further, the converter system further comprises a redundant power module, wherein the redundant power module comprises a power module and a direct current device;
the control system comprises a display module and a signal lamp module; the display module can display state information of each module and the power module in the online maintenance device; and the signal lamp module displays state information of each switch in the on-line maintenance device respectively.
The invention also discloses an online maintenance method of the cascade type converter system, which comprises the following steps:
When the power module fails, the bypass module shorts out the connection between the alternating current side and the power module according to the control system and the bypass signal of the control module, and feeds the bypass information back to the control module and the control system;
According to the isolation signals of the control system and the control module, the isolation module isolates the alternating current side from the power module and feeds isolation information back to the control module and the control system, so that maintenance personnel can conveniently maintain the power module with faults.
Further, the maintenance method further comprises any one of the following treatments according to the maintenance situation or the set condition:
If the power module with the fault is maintained or the power module with the fault is replaced by using the nearby power module, the bypass module and the isolation module are reconnected with the alternating current side and the power module, so that the power module is restored to normal work;
If the power module is not repaired in the first preset time and no replacement power module exists nearby, the redundant power module of the current transformation system is connected to the alternating current side;
if the first switch of the bypass module is continuously in a closed state within a second preset time, the redundant power module of the current transformation system is connected to the alternating current side, wherein the second preset time is longer than the first preset time;
If the set condition is met, when the power module is found to be faulty, the redundant power module of the converter system is directly accessed.
Further, the maintenance method further includes:
the state information of each module of the online maintenance device is displayed through a display module and a signal lamp module of the control system, and each module is controlled to execute corresponding control information through manual operation or instruction.
Further, the maintenance method further includes:
the power module or the redundant power module is connected to the alternating current side when the voltage signal crosses the zero point, the voltage signal on the alternating current side is collected through the connection module, then the collected voltage signal is sent to the control system, and the power module or the redundant power module is connected to the alternating current side when the voltage signal crosses the zero point, so that the safety and the stability of the system are ensured;
And after the on-line maintenance device is accessed, feeding back corresponding module state information of the on-line maintenance device to the control module and the control system, and displaying the state information through a display module and a signal lamp module of the current transformation system.
The beneficial effects of the invention are as follows: the invention realizes the high-voltage isolation of the power module by utilizing the bypass module and the isolation module, and the power module can be maintained or replaced on line after being isolated, the whole maintenance process does not need system shutdown, the reliability of the system can be improved, and the safety of the on-line maintenance or replacement of workers can be improved; under the condition of overlong online maintenance time or bad maintenance of the power module, the redundant power module can be quickly and safely accessed online by utilizing the access module, so that new faults of the cascading type converter system can be effectively prevented, and the stable operation of the system can be realized; by arranging the display module and the signal lamp module, the real-time monitoring of each module can be realized, and the safe operation of the cascade type converter system is ensured.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 shows a block diagram of the components of an online maintenance device in one embodiment of the application;
FIG. 2 is a schematic diagram showing the connection relationship between the online maintenance device and other modules in one embodiment of the application;
figure 3 shows a schematic diagram of a cascaded variable flow system in accordance with one embodiment of the present application;
FIG. 4 is a flow diagram of an online maintenance control instruction in one embodiment of the application;
FIG. 5 shows a flow diagram of an online maintenance method in one embodiment of the application.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
Example 1
The embodiment 1 of the invention discloses an online maintenance device which is used for a cascading converter system and is arranged between an alternating current side of the cascading converter system and a power module, as shown in fig. 1, and comprises a bypass module, an isolation module and a control module.
The bypass module is electrically connected with the isolation module and is arranged on a connecting passage of the alternating current side and the power module; the control module is respectively connected with the bypass module and the isolation module and is used for receiving and sending instructions to control the bypass module and the isolation module.
The bypass module comprises a first switch K1 which is arranged between the alternating current side and a wire of a connecting passage of the power module and is used for cutting off the connection between the alternating current side and the power module, and the bypass module is used for realizing the short circuit of the alternating current side of the cascade converter system by closing the first switch K1 so that the alternating current in the system does not pass through the power module; the isolation module comprises a second switch K2 which is arranged on a lead of a connecting passage of the alternating current side and the power module, the second switch K2 is used for isolating the alternating current side from the power module, and the isolation module realizes the isolation of the alternating current side and the power module by disconnecting the second switch K2.
When the cascade converter system normally operates, the on-line maintenance device is in an initial state, namely the first switch K1 in the bypass module is in an open state, and the second switch K2 in the isolation module is in a closed connection state, so that the power module associated with the on-line maintenance device can normally operate. When the system breaks down and needs to maintain the power module on line, the on-line maintenance device receives control information, according to the control information, the first switch K1 in the bypass module is connected, the second switch K2 in the isolation module is disconnected after the second switch K1 of the bypass module is connected, then the power module can be maintained or replaced on line, after the power module is maintained or replaced, the second switch K2 is closed, the first switch K1 is disconnected, and the system can resume normal operation. The invention realizes the high-voltage isolation of the power module by utilizing the bypass module and the isolation module, and can maintain or replace the power module on line after being isolated, the whole maintenance process does not need system shutdown, the system reliability can be improved, and the safety of on-line maintenance or replacement of workers is improved.
Further, the online maintenance device also comprises an access module.
One end of the access module is connected with the alternating current side through the bypass module, the other end of the access module is connected with the redundant power module, and the control module is connected with the access module and is used for receiving and sending instructions to control the access module; the access module controls whether one redundant power module is accessed to the alternating current side through the access or disconnection.
The access module comprises a third switch K3 which is arranged on a wire connected with the alternating current side; the third switch K3 is used for controlling the redundant power module to be connected to the ac loop.
When the cascade converter system normally operates, the third switch K3 is in an open state, and when the system fails and needs maintenance, the third switch K3 is closed under the condition that the online maintenance time is too long or the maintenance of the power module is bad, the redundant power module can be quickly and safely accessed online by utilizing the access module, and the redundant power module is accessed to the system and works, so that the system is recovered to normally operate. When the maintenance or replacement of the power module is completed, the control module controls the access module to be disconnected, and the replaced or maintained power module continues to work. The arrangement of the access module realizes that the redundant power module is accessed into the alternating current loop, so that new faults of the cascade type variable-current system can be effectively prevented, and the stable operation of the system is realized.
Further, the first switch K1, the second switch K2 and the third switch K3 are manual control devices or automatic control devices.
Further, the manual control device is any one of the following: a manual circuit breaker, a manual contactor, an isolating knife switch and a manual quick connector; the automatic control device is any one of the following: electronic switch, electronic contactor, electronic circuit breaker. For example, when the first switch K1 in the bypass module is an electronic switch, the electronic switch in the bypass module is automatically closed according to a closing instruction sent by the control system, so that a short circuit to the ac side of the cascaded converter system is realized. When the second switch K2 and the third switch K3 are isolation switches, two isolation switches with single blades or one isolation switch with double blades can be selected. Because the isolating knife switch is a manual control device, the breaking signal sent by the control system can be a breaking indication signal for indicating the breaking of the isolating module, and a maintainer can know that the isolating module is in a breaking state according to the breaking indication signal.
The manual control device and the automatic control device in the invention are not limited to the above listed types, but can be other control devices with opening and closing and control effects.
The first switch K1, the second switch K2 and the third switch K3 may also be manual and automatic integrated control devices, such as a contactor and a controller, and since the contactor or the breaker can be controlled manually or automatically, when the first switch K1 in the bypass module is the contactor or the breaker, when the control system sends a closing signal, the control signal of the contactor or the breaker can be utilized, a maintainer can press the control button to excite the control signal of the contactor or the breaker in a range far from the high voltage area, and the contactor or the breaker in the bypass module can be closed manually, or the contactor or the breaker in the bypass module can be closed automatically according to a closing instruction sent by the control system.
When the switch in the bypass module or the access module is a manual control device, the closing signal sent by the control system is a closing indication signal, and the closing signal can be realized by a flashing signal for controlling the flashing of the indication lamp or a color signal for controlling the lighting color of the indication lamp, and a worker operates the manual control device through the flashing signal or the color signal; when the connecting device in the bypass module or the access module is an automatic control device, the closing signal sent by the control system is a closing control command, and the control module controls the corresponding switch to be closed based on the closing control command. When the switch in the isolation module is a manual control device, the breaking signal sent by the control system is a breaking indication signal, and a worker operates the manual control device through a flashing signal or a color signal; when the switch in the isolation module is an automatic control device, the breaking signal sent by the control system is a breaking control command, and the control module controls the corresponding switch to be disconnected based on the breaking control command.
Example 2
As shown in fig. 3, embodiment 2 of the present invention discloses a cascade type converter system, where the cascade type converter system includes three-phase cascade branches and a control system, each cascade branch is formed by connecting a plurality of power modules in series on an ac side, the ac side of each power module is connected with any one of the above-mentioned online maintenance devices, and the dc side of the power module is connected with the dc device; the control system is used for controlling the online maintenance device to work.
Further, as shown in fig. 2, the current transformation system further includes a redundant power module, where the redundant power module includes a power module and a dc device; when the maintenance time of the fault power module is too long or the fault power module cannot be replaced, the control system can enable the redundant power module to be connected into the alternating current loop through controlling the access module, so that the replacement function is achieved.
The control system comprises a display module and a signal lamp module; the display module can display the state information of each module and the power module in the on-line maintenance device; the signal lamp module displays the state information of each switch in the on-line maintenance device respectively, the state of the fault power module and the on-line maintenance device is known through the conditions of the display module and the signal lamp module, the maintenance or replacement of the fault power module is facilitated, and meanwhile, the safety during maintenance is guaranteed.
Example 3
The embodiment 3 of the invention discloses an online maintenance method of a cascade type converter system of any one of the above, and the flow of the method is shown in fig. 4, and the method specifically comprises the following steps:
Step 110, when the power module fails, according to the bypass signals of the control system and the control module, the bypass module short-circuits the connection between the alternating-current side and the power module, and feeds the bypass information back to the control module and the control system; and the state of the bypass module is displayed through the display module and the signal lamp module, when bypass information is fed back to the control module, the display module displays that the power module is bypassed, and the signal lamp is turned on to indicate that the first switch K1 is in a closed state.
Step 120, according to the isolation signals of the control system and the control module, the isolation module isolates the alternating current side and the power module, and feeds the isolation information back to the control module and the control system, and the state of the isolation module is displayed through the display module and the signal lamp module, so that maintenance personnel can maintain the power module with faults conveniently, when the isolation information is fed back to the control module, the display module displays that the power module is isolated, the signal lamp is lightened, and the second switch K2 is in an off state.
Further, the maintenance method further includes any one of the following processes according to the maintenance situation or the set condition:
If the failed power module is maintained or replaced by a nearby power module, the bypass module and the isolation module are reconnected with the alternating current side and the power module, the first switch K1 is opened, the second switch K2 is closed, and the power module is restored to normal operation.
If the power module is not maintained in the first preset time and no replacement power module exists nearby, the redundant power module of the converter system is connected to the alternating current side, the third switch K3 is closed, the first switch K1 is opened, and the redundant power module replaces the fault power module to be connected to the alternating current loop.
And if the first switch of the bypass module is continuously in a closed state within a second preset time, connecting the redundant power module of the current transformation system to the alternating current side, wherein the second preset time is longer than the first preset time.
If the set condition is met, when the power module is found to be faulty, the redundant power module of the converter system is directly accessed.
Under the condition of overlong online maintenance time or bad maintenance of the power module, the redundant power module can be quickly and safely accessed online by utilizing the access module, so that new faults of the cascading type converter system can be effectively prevented, and the stable operation of the system can be realized; by arranging the display module and the signal lamp module, the real-time monitoring of each module can be realized, and the safe operation of the cascade type converter system is ensured.
When the redundant power module is connected to the alternating current loop, the access module feeds back state information to the control module, the states of the access module and the power module are displayed through the display module and the signal lamp module, and when the access information is fed back to the control module, the display module displays that the redundant power module is connected to the alternating current loop, signals and the like are lightened, and the third switch K3 is closed.
Further, fig. 5 shows a schematic instruction flow diagram of the control system to the online control device, and the corresponding maintenance method works according to the control instruction of the control system, specifically, according to the working requirements of the display module and the signal lamp module, further includes: the state information of each module of the on-line maintenance device is displayed through a display module and a signal lamp module of the control system, and the corresponding control information is executed through manual or instruction control of each module.
The display module displays the bypass module capable of closing the bypass power module when the control system sends a closing signal to the bypass module, and displays that the power module is bypassed after the bypass module is closed; and when the control system sends a breaking signal to the isolation module, displaying the isolation module capable of breaking the power module, and after the isolation module is broken, displaying that the power module can be maintained on line. When the redundant power module is required to be accessed, the display module displays the accessible module, and after the access module is closed, the display module displays that the redundant power module is accessed.
The state of each switch in the on-line maintenance device is realized through the signal lamp module. When the first switch K1 is turned off, the corresponding signal lamp is not on, and when the first switch K1 is turned on, the corresponding signal lamp is on; when the second switch K2 is closed, the corresponding signal lamp is not on, and when the second switch K2 is opened, the corresponding signal lamp is on; when the third switch K3 is turned off, its corresponding signal lamp is not turned on, and when the third switch K3 is turned on, its corresponding signal lamp is turned on.
Further, according to the access requirement of the redundant power module, the maintenance method further comprises: the power module or the redundant power module is connected to the alternating current side when the voltage signal crosses the zero point, the voltage signal of the alternating current side is collected through the connection module, then the collected voltage signal is sent to the control system, and the power module or the redundant power module is connected to the alternating current side when the voltage signal crosses the zero point, so that the safety and the stability of the system are ensured.
And after the on-line maintenance device is accessed, the corresponding module state information of the on-line maintenance device is fed back to the control module and the control system, and the state information is displayed through the display module and the signal lamp module of the current transformation system.
In summary, the application discloses an online maintenance device, a cascade type converter system and an online maintenance method thereof. The on-line maintenance device is used for the cascading converter system and is arranged between the alternating current side of the cascading converter system and the power module, and comprises a bypass module, an isolation module and a control module; the bypass module is electrically connected with the isolation module and is arranged on a connecting passage of the alternating current side and the power module; the control module is respectively connected with the bypass module and the isolation module and is used for receiving and sending instructions to control the bypass module and the isolation module; the bypass module comprises a first switch, a second switch and a first switch, wherein the first switch is arranged between the alternating current side and a wire of a connecting passage of the power module and is used for cutting off the connection between the alternating current side and the power module; the isolation module comprises a second switch which is arranged on a conducting wire of a connecting passage of the alternating current side and the power module and is used for isolating the alternating current side and the power module. The application realizes the high-voltage isolation of the power module by utilizing the bypass module and the isolation module, and the power module can be maintained or replaced on line after being isolated, the whole maintenance process does not need system shutdown, the reliability of the system can be improved, and the safety of the on-line maintenance or replacement of workers can be improved; under the condition of overlong online maintenance time or bad maintenance of the power module, the redundant power module can be quickly and safely accessed online by utilizing the access module, so that new faults of the cascading type converter system can be effectively prevented, and the stable operation of the system can be realized; by arranging the display module and the signal lamp module, the real-time monitoring of each module can be realized, and the safe operation of the cascade type converter system is ensured.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art can easily think about variations, substitutions and improvements within the technical scope of the present invention, and the scope of the present invention is intended to be covered by the present invention.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Claims (1)
1. The online maintenance method of the cascade type converter system is characterized in that the cascade type converter system comprises an online maintenance device which is used for a cascade type converter and is arranged between an alternating current side of the cascade type converter system and a power module, and the online maintenance device is characterized by comprising a bypass module, an isolation module and a control module;
The bypass module is electrically connected with the isolation module and is arranged on a connecting passage of the alternating current side and the power module; the control module is respectively connected with the bypass module and the isolation module and is used for receiving and sending instructions to control the bypass module and the isolation module;
the bypass module comprises a first switch, a second switch and a first switch, wherein the first switch is arranged between the alternating current side and a wire of a connecting channel of the power module and is used for cutting off the connection between the alternating current side and the power module; the isolation module comprises a second switch which is arranged on a wire of a connecting passage of the alternating current side and the power module and is used for isolating the alternating current side and the power module;
the cascade type converter system comprises three-phase cascade branches and a control system, each cascade branch is formed by connecting a plurality of power modules in series on an alternating current side, the alternating current side of each power module is connected with an on-line maintenance device, and the direct current side of each power module is connected with a direct current device; the control system is used for controlling the online maintenance device to work;
The online maintenance device also comprises an access module; one end of the access module is connected with the alternating current side through the bypass module, the other end of the access module is connected with the redundant power module, and the control module is connected with the access module and is used for receiving and sending instructions to control the access module;
the access module comprises a third switch which is arranged on a wire connected with the alternating current side; the third switch is used for controlling the redundant power module to be connected to the alternating current side;
The maintenance method comprises the following steps:
When the power module fails, the bypass module shorts out the connection between the alternating current side and the power module according to the control system and the bypass signal of the control module, and feeds back the bypass signal to the control module and the control system;
According to the isolation signals of the control system and the control module, the isolation module isolates the alternating current side and the power module and feeds back the isolation signals to the control module and the control system, so that maintenance personnel can conveniently maintain the power module with faults;
the maintenance method further comprises the following steps of:
If the power module with the fault is maintained or replaced by a nearby power module, the bypass module and the isolation module are reconnected with the alternating current side and the power module, the first switch is opened, and the second switch is closed, so that the power module is recovered to work normally;
if the power module is not repaired in the first preset time and no replacement power module exists nearby, the redundant power module of the converter system is connected to the alternating current side, the third switch is closed, the first switch is opened, and the redundant power module replaces the fault power module to be connected to the alternating current side;
if the first switch of the bypass module is continuously in a closed state within a second preset time, the redundant power module of the current transformation system is connected to the alternating current side, wherein the second preset time is longer than the first preset time;
if the set condition is met, when the power module is found to be faulty, the redundant power module of the converter system is directly accessed;
The maintenance method further includes:
The state information of each module of the online maintenance device is displayed through a display module and a signal lamp module of the control system, and each module is controlled to execute corresponding control information through manual operation or instruction;
The maintenance method further includes:
the power module or the redundant power module is connected to the alternating current side when the voltage signal crosses the zero point, the voltage signal on the alternating current side is collected through the connection module, then the collected voltage signal is sent to the control system, and the power module or the redundant power module is connected to the alternating current side when the voltage signal crosses the zero point, so that the safety and the stability of the system are ensured;
After the on-line maintenance device is accessed, corresponding module state information of the on-line maintenance device is fed back to the control module and the control system, and the state information is displayed through a display module and a signal lamp module of the current transformation system;
The first switch, the second switch and the third switch are manual control devices or automatic control devices;
the manual control device is any one of the following: a manual circuit breaker, a manual contactor, an isolating knife switch and a manual quick connector; the automatic control device is an electronic switch;
When the first switch is an electronic switch, the closing state and the opening state of the first switch are automatically adjusted according to the instruction sent by the control system; when the second switch and the third switch are isolation switches, the control system sends out instructions through the indication signals to prompt a maintainer to know the working state of the isolation module according to the indication signals.
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| CN202010065325.3A CN111146933B (en) | 2020-01-20 | 2020-01-20 | Online maintenance device, cascading type variable flow system and online maintenance method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699732A (en) * | 2009-10-30 | 2010-04-28 | 艾默生网络能源有限公司 | Fault control method of converter |
| WO2017049907A1 (en) * | 2015-09-22 | 2017-03-30 | 郑贵林 | Dynamic power switch action time measurement and precise alternating-current zero crossing point control method and application |
| CN108880291A (en) * | 2018-07-27 | 2018-11-23 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
| CN109039041A (en) * | 2018-07-27 | 2018-12-18 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8212401B2 (en) * | 2007-08-03 | 2012-07-03 | Stratascale, Inc. | Redundant isolation and bypass of critical power equipment |
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2020
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|---|---|---|---|---|
| CN101699732A (en) * | 2009-10-30 | 2010-04-28 | 艾默生网络能源有限公司 | Fault control method of converter |
| WO2017049907A1 (en) * | 2015-09-22 | 2017-03-30 | 郑贵林 | Dynamic power switch action time measurement and precise alternating-current zero crossing point control method and application |
| CN108880291A (en) * | 2018-07-27 | 2018-11-23 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
| CN109039041A (en) * | 2018-07-27 | 2018-12-18 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
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