CN113036931A

CN113036931A - Optical fiber series high-voltage frequency converter and control method thereof

Info

Publication number: CN113036931A
Application number: CN202110555023.9A
Authority: CN
Inventors: 安琦
Original assignee: Suzhou Huichuan Control Technology Co Ltd
Current assignee: Suzhou Huichuan Control Technology Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-06-25
Anticipated expiration: 2041-05-21
Also published as: CN113036931B

Abstract

The invention belongs to the technical field of frequency converters and discloses an optical fiber series high-voltage frequency converter and a control method thereof. The high-voltage frequency converter comprises a main control module and a one-phase or multi-phase power module; each phase of power module comprises one or more power units which are sequentially connected in series, when the power units break down, a preset fault frame is generated and sent to secondary power units connected with the power units, and the secondary power units carry out data transmission and send the preset fault frame to the main control module; and when receiving the preset fault frame, the main control module sends a preset command frame to each power unit and carries out fault diagnosis according to the fault information fed back by each power unit. According to the invention, the fault signal is quickly transmitted to each unit and each module of the series circuit through data transmission, the main control module can quickly send a corresponding instruction according to the fault signal to acquire fault information and diagnose the fault information, so that the fault quick diagnosis of the optical fiber series high-voltage frequency converter is realized.

Description

Optical fiber series high-voltage frequency converter and control method thereof

Technical Field

The invention relates to the technical field of frequency converters, in particular to an optical fiber series high-voltage frequency converter and a control method thereof.

Background

Compared with a parallel connection type, the optical fiber series high-voltage frequency converter reduces the number of optical fiber transceivers and the length of optical fibers, and saves cost. The conventional fault uploading method for each power unit of the optical fiber series high-voltage frequency converter generally comprises the following steps: the M.1-th unit (M represents A, B, C three phases) transmits the fault data to the M.2-th unit, the M.2-th unit receives the fault data of the M.1-th unit and analyzes the fault data to obtain an analysis result, and then the analysis result and the fault data of the M.2-th unit are packaged into a data frame and transmitted to the M.3-th unit. Each unit sequentially analyzes, packages and uploads fault data in the same mode, finally the fault data and all analysis results are transmitted to a main control through an M.N unit (N represents the maximum unit number of each phase), and the main control diagnoses the corresponding fault unit and specific fault information after analysis.

However, compared with the optical fiber parallel high-voltage frequency converter, the data communication period between the power unit and the main control unit is increased by sequentially analyzing, packing and uploading fault data unit by unit, the main control unit cannot rapidly diagnose faults, and correct measures cannot be timely taken to protect the frequency converter and the associated system under the condition of serious faults. Also, the greater the number of series units per phase, the longer it takes to diagnose a fault.

Disclosure of Invention

The invention mainly aims to provide an optical fiber series high-voltage frequency converter and a control method thereof, and aims to solve the technical problem of long data communication period in the fault diagnosis process of the optical fiber series high-voltage frequency converter in the prior art.

In order to achieve the above object, the present invention provides an optical fiber series connection type high voltage frequency converter, which includes a main control module and a one-phase or multi-phase power module; the power module of each phase comprises one or more power units which are sequentially connected in series, the output end of the main control module is connected with the input end of the power module of each phase, and the feedback end of the power module of each phase is connected with the other end of the main control module;

the power unit is used for generating a preset fault frame when a fault occurs, and sending the preset fault frame to a secondary power unit connected with the power unit, and the secondary power unit conducts data transmission and sends the preset fault frame to the main control module;

the main control module is used for sending a preset command frame to each power unit on each phase of the power module when receiving the preset fault frame so as to enable each power unit to feed back fault information;

and the main control module is also used for carrying out fault diagnosis according to the fault information.

Optionally, the preset command frame includes a first preset command frame and a second preset command frame; the fault information comprises fault type data and fault content data;

the main control module is used for generating a first preset command frame when receiving the preset fault frame, and sending the first preset command frame to each power unit so as to enable each power unit to feed back fault type data;

the main control module is used for positioning a target fault power unit according to the fault type data, generating a second preset command frame according to a positioning result, and sending the second preset command frame to the target fault power unit so as to enable the target fault power unit to feed back fault content data;

and the main control module is also used for carrying out fault diagnosis according to the fault content data.

Optionally, the main control module includes a main processor and a main control optical fiber transceiver module, one end of the main processor is connected to one end of the main control optical fiber transceiver module, an output end of the main control optical fiber transceiver module is connected to an input end of the power module, and the other end of the main control optical fiber transceiver module is connected to a feedback end of the power module;

the main processor is used for generating pulse width modulation information and control instruction information, packaging the pulse width modulation information and the control instruction information to generate the preset data frame, and sending the preset data frame to the main control optical fiber transceiving module;

and the main control optical fiber transceiver module is used for transmitting the preset data frame to each power unit.

Optionally, the power unit is further configured to control a power device according to the preset data frame, and collect state information and fault information of the power device and send the state information and the fault information to the main control optical fiber transceiver module.

Optionally, the power unit is further configured to interrupt current data transmission through the preset failure frame when a failure occurs.

Optionally, the power unit is specifically configured to generate a preset fault frame according to a first preset frame format when a fault occurs, and send the preset fault frame to a secondary power unit connected to each phase of the power unit, so that the secondary power unit performs data transparent transmission and sends the preset fault frame to the main control module;

and the main control module generates a preset command frame according to a second preset frame format and sends the preset command frame to each power module.

Optionally, each bit of the first preset frame format is at a high level.

Optionally, the start bit of the second preset frame format is at a high level, and the stop bit is at a low level.

In addition, in order to achieve the above object, the present invention further provides a control method of an optical fiber tandem type high voltage inverter, the control method being based on the optical fiber tandem type high voltage inverter as described above, the control method including:

when a power unit fails, generating a preset fault frame, sending the preset fault frame to a secondary power unit connected with the power unit, and transmitting the preset fault frame to the main control module by the secondary power unit through data transmission;

when receiving the preset fault frame, the main control module sends a preset command frame to each power unit on each phase of the power module so that each power unit feeds back fault information;

and the main control module carries out fault diagnosis according to the fault information.

The invention provides an optical fiber series connection type high-voltage frequency converter, which comprises a main control module and a power module; the power module comprises a plurality of power units which are sequentially connected in series; the power unit is used for generating a preset fault frame when a fault occurs, and sending the preset fault frame to a secondary power unit connected with the power unit so that the secondary power unit can perform data transmission and send the preset fault frame to the main control module; the main control module is used for sending a preset command frame to each power unit when receiving the preset fault frame so as to enable each power unit to feed back fault information; and the main control module is also used for carrying out fault diagnosis according to the fault information. According to the invention, the fault signal is quickly transmitted to each unit and module of the series circuit in a data transparent transmission mode, the main control module can quickly send a corresponding instruction according to the fault signal to acquire fault information and diagnose the fault information, so that the fault quick diagnosis of the optical fiber series high-voltage frequency converter is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first embodiment of an optical fiber series connection type high-voltage frequency converter according to the invention;

fig. 2 is a schematic structural diagram of a second embodiment of the fiber-optic tandem type high-voltage inverter according to the present invention;

fig. 3 is a schematic flow chart of a first embodiment of an optical fiber series high-voltage inverter according to the invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Main control module	101	Main processor
200	Power module	102	Master control optical fiber transceiver module
				201	First power unit	202	Second power unit
		20N	Nth power unit

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

An embodiment of the present invention provides an optical fiber series high-voltage frequency converter, and referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of the optical fiber series high-voltage frequency converter according to the present invention.

It should be noted that fig. 1 is one phase of the optical fiber series connection type high-voltage frequency converter, which includes other phases in a specific implementation and does not show the other phases, but does not affect the explanation of the embodiment.

The optical fiber series high-voltage frequency converter comprises a main control module 100 and a one-phase or multi-phase power module 200; each phase of the power module 200 includes one or more power units (refer to a first power unit 201 and a second power unit 202.. times.nth power unit 20N in fig. 1) connected in series in sequence, an output end of the main control module 100 is connected with an input end of each phase of the power module 200, and a feedback end of each phase of the power module 200 is connected with the other end of the main control module 100;

it is easy to understand that the fiber optic series high voltage inverter includes only one main control module 100, specifically, fig. 1 illustrates a power module 200 of a certain phase and the main control module 100 corresponding to the entire fiber optic series high voltage inverter.

The power unit is configured to generate a preset fault frame when a fault occurs, and send the preset fault frame to a secondary power unit connected to the power unit, so that the secondary power unit performs data transmission and sends the preset fault frame to the main control module 100;

it should be noted that the main control module 100 includes a main control optical fiber transceiver module, each power unit also includes an optical fiber transceiver module (not shown in the figure, but does not affect the explanation of the embodiment), and the optical fiber transceiver modules are connected in series through optical fibers to form a series circuit. The optical fiber transceiver module enables data to be transmitted among the units and the modules.

It is easily understood that, referring to fig. 1, the power module 200 includes N power units, in a specific implementation, the power units may be positive integers greater than or equal to 1, and the number of the power units in this embodiment is only for convenience of explanation, and is not limited to the specific implementation. When a power unit fails, the failed power unit automatically generates a failure signal, that is, the preset failure frame, and the power unit connected to the next stage of the failed power unit receives the preset failure frame, analyzes the preset failure frame, and then feeds back the preset failure frame to the main control module 100 in a data transparent transmission manner. The transparent transmission of data is a transmission mode which only transmits the transmission content from a sending address to a destination address without any content change to the transmission content. Through data transparent transmission, data of a preset fault frame can be fed back to the main control module 100 through each power unit connected in series, communication delay is avoided, and only small physical link transmission delay exists.

The power unit is specifically configured to generate a preset fault frame according to a first preset frame format when a fault occurs, and send the preset fault frame to a secondary power unit connected to the power unit, so that the secondary power unit performs data transmission and sends the preset fault frame to the main control module 100;

it should be noted that, the first preset frame format may refer to table 1 below;

(Table 1)

Bit/bit

Start bit

bit0

bit1

bit2

bit 3

bit 4

bit 5

bit 6

bit 7

Stop position

Level of electricity

H

It should be noted that each bit of the first preset frame format is at a high level.

Further, the power unit is further configured to interrupt current data transmission through the preset fault frame when a fault occurs. The power unit is further used for protecting the frequency converter when receiving a preset fault frame.

It should be noted that, the current data transmission is in a transmission mode when the current data transmission is in normal operation without a fault, in the normal operation mode, the power units transmit data frames through a second preset frame format, and when a fault occurs, the power units interrupt the original data transmission through a preset fault frame. Further, since the power units are connected in series, the input end of the power module 200 is connected to the output end of the main control module 100, and when data is transmitted, a preset fault frame output by the power module 200 enters the main control module 100 and then returns to the input end of the power module 200 through the output end of the main control module 100, so that all the power units in the power module 200 receive the preset fault frame, and when receiving the preset fault frame, the power units start corresponding protection measures to protect the frequency converter. The protection measures are set according to actual requirements, and this embodiment does not limit this.

It should be noted that, the second preset frame format may refer to table 2 below;

(Table 2)

Bit/bit

Start bit

bit0

bit1

bit2

bit 3

bit 4

bit 5

bit 6

bit 7

Stop position

Level of electricity

H

/

L

In the second predetermined frame format, the levels of bits 0-7 are not limited in this embodiment, and can be adjusted according to actual requirements, but the start bit is defined as a high level and the stop bit is defined as a low level.

The main control module 100 is configured to send a preset command frame to each power unit on each phase of the power module 200 when receiving the preset fault frame, so that each power unit feeds back fault information;

it should be noted that, when the main control module 100 receives a preset fault frame, it indicates that a certain one or certain ones of the power modules 200 have a fault, and the preset fault frame triggers the main control module 100 to issue a preset command frame, so as to obtain an actual condition of a power unit, that is, the fault information.

The main control module 100 is further configured to perform fault diagnosis according to the fault information.

It should be understood that, after receiving the failure information, the main control module 100 may parse the failure information to determine the failed power unit, the failure type of the failed power unit, and specific failure content information.

It should be noted that the preset command frame includes a first preset command frame and a second preset command frame; the fault information comprises fault type data and fault content data;

the main control module 100 is configured to generate a first preset command frame when receiving the preset fault frame, and send the first preset command frame to each power unit, so that each power unit feeds back fault type data;

the main control module 100 is configured to position a target fault power unit according to the fault type data, generate a second preset command frame according to a positioning result, and send the second preset command frame to the target fault power unit, so that the target fault power unit feeds back fault content data;

it should be noted that the main control module 100 obtains the fault type data of each power unit through a first preset command frame issued for the first time, if the power unit fails, the uploaded fault type data is a no-fault type, if the power unit fails, the uploaded fault type is a current fault type, and the main control module 100 can determine which specific power unit or power units are the faulty power units according to the fault type data uploaded by each power module 200, and uses the determined power units as target fault power units.

It is easy to understand that each power unit has its own identifier, and the transmitted data carries the identifier, so that the main control module 100 can distinguish the data transmitted by each power unit, thereby locating the target failed power unit.

It should be further noted that the second preset command frame is still serially transmitted through the serial loop, but only acts on the target faulty power unit, so that the target faulty power unit is triggered, and specific fault content data is sent to the main control module 100, so that the main control module 100 can perform fault diagnosis on the fault content data.

The main control module 100 is further configured to perform fault diagnosis according to the fault content data.

The examples given above are illustrative, for example: the power module 200 includes N power units, when a power unit a (where a is a positive integer greater than 2 and smaller than B) and a power unit B (where B is a positive integer greater than a and smaller than N) in the power module 200 have failed, the power unit A, B generates a preset failure frame in a first preset frame format to interrupt current data transmission, and the power module 200 stops transmission of normal data. The power unit A sends a preset fault frame to a next-stage power unit A +1 connected with the power unit A, so that the power unit A +1 analyzes the preset fault frame, and transmits the preset fault frame to the power unit A +2 while analyzing the preset fault frame, and sequentially transmits the preset fault frame to the main control module 100 and each power unit in the series circuit; based on the same principle, the power unit B also performs the operation as described above. After receiving the preset fault frame, the main control module 100 sends a first preset command frame, so that each power unit feeds back fault type data, and the power units a and B respectively feed back the fault types, so that the main control module 100 can locate which two power units the power units a and B are actually, and send a second preset command frame to obtain specific fault data.

The format of the first preset command frame is a second preset frame format, and the format of the second preset command frame is a second preset frame format.

It should be noted that, the content of the first preset command frame may refer to table 3 below;

(Table 3)

Bit/bit	0-3	4-7	8	9	10-17
						Data definition	Frame header	Specifying a cell address	Uploading fault type command words	Uploading specific fault information command words	Verification
Level of electricity	/	/	H	L	/

It should be noted that, the content of the second preset command frame may refer to table 4 below;

(Table 4)

Bit/bit	0-3	4-7	8	9	10-17
						Data definition	Frame header	Specifying a cell address	Uploading fault type command words	Uploading specific fault information command words	Verification
Level of electricity	/	/	L	H	/

Other bits of the first and second preset command frames may be set according to actual requirements, which is not limited in this embodiment.

It should be noted that, if the main control module 100 fails, the main control fiber transceiver module in the main control module 100 generates a preset failure frame in a first preset frame format to interrupt current data transmission, and transparently transmits the preset failure frame to all fiber transceiver modules in the entire series circuit, so that each power unit starts a corresponding protection measure, and meanwhile, the main control fiber transceiver module directly internally transmits failure information to the main processor of the main control module 100, so that the main processor diagnoses the failure information.

In this embodiment, the fault signal is quickly transmitted to each unit module of the series circuit in a data transparent transmission manner, and each unit quickly takes measures to protect the frequency converter. And a command frame is adopted to position a fault unit first, and then a specific fault information reading mode is carried out to obtain a fault unit and specific fault information, so that the fault rapid diagnosis of the optical fiber series high-voltage frequency converter is realized.

In addition, a second embodiment of the fiber-optic series high-voltage frequency converter is further provided based on the first embodiment of the fiber-optic series high-voltage frequency converter, referring to fig. 2, and fig. 2 is a schematic structural diagram of the second embodiment of the fiber-optic series high-voltage frequency converter according to the present invention.

It should be noted that fig. 2 is one phase of the optical fiber series high-voltage frequency converter, which includes other phases in a specific implementation and does not show the other phases, but does not affect the explanation of the embodiment.

The main control module 100 includes a main processor 101 and a main control fiber transceiver module 102, one end of the main processor 101 is connected to one end of the main control fiber transceiver module 102, an output end of the main control fiber transceiver module 102 is connected to an input end of the power module 200, and the other end of the main control fiber transceiver module 102 is connected to a feedback end of the power module 200;

the main processor 101 is configured to generate pulse width modulation information and control instruction information, and package the pulse width modulation information and the control instruction information to generate the preset data frame, and send the preset data frame to the main control optical fiber transceiver module 102;

it should be noted that the master optical fiber transceiver module 102 and the optical fiber transceiver module (not shown in fig. 1 and fig. 2, but does not affect the explanation of the embodiment) in the power unit are connected in series to form a series loop.

The main control fiber transceiver module 102 is configured to send the preset data frame to each power unit.

It is easy to understand that, in this embodiment, the data transmission process is performed when neither the power module 200 nor the main control module 100 fails.

The main processor 101 is specifically configured to package the pwm information and the control instruction information, generate a preset data frame according to a second preset frame format and a package result, and send the preset data frame to each phase of the power module 200 through the main control fiber transceiver module 102.

It should be understood that the second preset frame format is a data transmission format when the frequency converter normally works, the main processor 101 packages the pulse width modulation information and the control instruction information and converts the packaged pulse width modulation information and the control instruction information into a preset data frame according to the second preset frame format, and the main control optical fiber transceiver module 102 sends the preset data frame containing the pulse width modulation information and the control instruction information to each power unit, so that each power unit can receive the pulse width modulation information and the control instruction information.

The power unit is further configured to control the power device according to the preset data frame, collect state information and fault information of the power device, and send the state information and the fault information to the main control optical fiber transceiver module 102.

It is easy to understand that each power unit can control the power device according to the pwm information and the control command information, so that the power device is turned on or off according to the pwm information and the control command information.

In the embodiment, the main control fiber transceiver module 102 and the fiber transceiver modules in each power unit perform information transmission of a serial loop, so that the number of fiber transceivers and the length of optical fibers are reduced, and the cost is saved.

In addition, an embodiment of the present invention further provides a method for controlling an optical fiber tandem type high-voltage frequency converter, referring to fig. 3, where fig. 3 is a schematic flow diagram of a first embodiment of the optical fiber tandem type high-voltage frequency converter according to the present invention; the control method is based on the optical fiber series connection type high-voltage frequency converter, and comprises the following steps:

Step S10: when a power unit fails, generating a preset fault frame, and sending the preset fault frame to a secondary power unit connected with the power unit, so that the secondary power unit performs data transmission and sends the preset fault frame to the main control module;

it should be noted that, the first preset frame format may refer to table 1 in the embodiment of the fiber-optic tandem high-voltage frequency converter;

It should be noted that, the second preset frame format may refer to table 2 in the embodiment of the fiber-optic tandem high-voltage inverter;

Step S20: when receiving the preset fault frame, the main control module sends a preset command frame to each power unit on each phase of the power module 200, so that each power unit feeds back fault information;

Step S30: and the main control module carries out fault diagnosis according to the fault information.

It should be noted that, the content of the first preset command frame may refer to table 3 in the embodiment of the fiber-optic tandem high-voltage inverter;

it should be noted that, the content of the second preset command frame may refer to table 4 in the embodiment of the fiber-optic tandem high-voltage inverter;

It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.

It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.

In addition, the technical details that are not described in detail in this embodiment can be referred to the fiber-optic series high-voltage frequency converter provided in any embodiment of the present invention, and are not described herein again.

Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An optical fiber series connection type high-voltage frequency converter is characterized by comprising a main control module and a one-phase or multi-phase power module; the power module of each phase comprises one or more power units which are sequentially connected in series, the output end of the main control module is connected with the input end of the power module of each phase, and the feedback end of the power module of each phase is connected with the other end of the main control module;

2. The fiber optic series high voltage inverter of claim 1, wherein said preset command frame comprises a first preset command frame and a second preset command frame; the fault information comprises fault type data and fault content data;

3. The fiber-optic series high-voltage frequency converter according to claim 1, wherein the master control module comprises a master processor and a master fiber transceiver module, one end of the master processor is connected with one end of the master fiber transceiver module, an output end of the master fiber transceiver module is connected with an input end of the power module, and the other end of the master fiber transceiver module is connected with a feedback end of the power module;

4. The fiber-optic series high-voltage frequency converter according to claim 3, wherein the power unit is further configured to control a power device according to the preset data frame, and collect status information and fault information of the power device and send the status information and the fault information to the main control fiber transceiver module.

5. The fiber optic series high voltage inverter of claim 1, wherein the power unit is further configured to interrupt a current data transmission through the predetermined failure frame when a failure occurs.

6. The fiber-optic series high-voltage frequency converter according to claim 1, wherein the power unit is specifically configured to generate a preset fault frame according to a first preset frame format when a fault occurs, and send the preset fault frame to the secondary power unit connected to each phase of the power unit, so that the secondary power unit performs data transmission to send the preset fault frame to the main control module;

7. The fiber optic series high voltage frequency converter of claim 6, wherein each bit of said first predetermined frame format is high level.

8. The fiber optic series high voltage inverter of claim 6, wherein said second predetermined frame format start bit is high level and stop bit is low level.

9. A control method of an optical fiber tandem type high voltage inverter, the control method being based on the optical fiber tandem type high voltage inverter according to any one of claims 1 to 8, the control method comprising: