KR101774977B1 - Operation control apparatus and method of redundant sub module in modular multilevel converter - Google Patents

Operation control apparatus and method of redundant sub module in modular multilevel converter Download PDF

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KR101774977B1
KR101774977B1 KR1020150190344A KR20150190344A KR101774977B1 KR 101774977 B1 KR101774977 B1 KR 101774977B1 KR 1020150190344 A KR1020150190344 A KR 1020150190344A KR 20150190344 A KR20150190344 A KR 20150190344A KR 101774977 B1 KR101774977 B1 KR 101774977B1
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order
submodules
submodule
participating
temperature
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KR1020150190344A
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Korean (ko)
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KR20170079598A (en
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왕인수
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주식회사 효성
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Priority to PCT/KR2016/006637 priority patent/WO2017115952A1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/49—Combination of the output voltage waveforms of a plurality of converters

Abstract

The present invention provides a submodule operation control device and a control method of a modular multi-level converter for checking the temperature of the submodule during operation of the MMC converter and inputting or replacing the same.
The submodule operation control device of the modular multi-level converter (MMC) according to the present invention includes a plurality of submodules participating in operation and a plurality of standby submodules An image camera; A temperature extracting unit for extracting the temperature for each submodule from the photographed thermal image; A sequence of replacement sequence to be replaced in a submodule participating in the operation of the MMC converter according to the extracted temperature information of each submodule and a participation order to participate in the operation in the spare submodule; And a control unit for controlling the MMC converter to perform an operation by replacing and participating in submodules according to the order of replacement of the submodules participating in the operation and the order of participation of the spare submodules.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control apparatus and a control method of a modular multilevel converter,

The present invention relates to a submodule operation of a modular multi-level converter (MMC), and more particularly to a submodule operation control device and method of a modular multi-level converter for checking the temperature of the submodule during operation of the MMC converter, .

The modular multi-level converter (MMC) is a type of multi-level converter, and is a converter composed of several sub-modules (SM). The modular multilevel converter (MMC) can represent the high voltage output and the large output of multiple converters, and the output voltage can be controlled by the stepped output.

These MMC converters are simpler in structure than conventional multilevel converters and are easier to implement and have the advantage of using redundant submodules to extend their service life.

1 is a configuration diagram of a conventional general MMC converter.

1, an MMC converter 10 is constituted by one or more phase modules 1, and each phase module 1 comprises a plurality of submodules (not shown) having two output terminals X1 and X2 10) are connected in series. The load connection terminals L1, L2, and L3 may be connected to a three-phase load, for example, a three-phase AC power system. The phase module 1 is divided into an upper phase module 1a and a lower phase module 1b on the basis of the load connection terminals L1, L2 and L3.

The MMC converter 1 further includes a plurality of standby submodules 11 in addition to a plurality of submodules 10 participating in the operation in preparation for occurrence of a failure during operation of the submodule 10 have. The spare submodule 11 does not output a voltage but, in a standby state, the spare submodule 11 is also connected to the submodule 10 And the carrier signal is applied.

However, since the submodule is a very important component in the conventional MMC converter 1, it is very important to check and manage the state of the submodule 10 participating in the operation and the spare submodule 11 waiting. To this end, the status of the sub-modules 10 and 11 is checked during the maintenance period and maintained to maintain the best state. However, when the MMC converter is in operation, the status of the submodule 10 participating in the operation and the standby submodule 11 can not be checked, so that even though the status of the submodule 10 participating in the operation is poor There is a problem in reliability of the MMC converter 1 because the operation must continue until a failure occurs. In addition, in the case of the spare sub-module 11, it is possible to insert a sub-module in a bad state even though the spare sub-module is in good condition. Even in this case, the reliability of the MMC converter may be adversely affected.

Accordingly, in the related art, there is a technique of checking the status of submodules and spare submodules participating in operation in real time during operation of the MMC converter in real time, determining replacement order and participation order, and performing replacement and operation according to the order Is required.

U.S. Published Patent Application No. 2008-0259661 U.S. Published Patent Application No. 20110134667

An object of the present invention is to provide an apparatus and method for controlling operation of a submodule of a modular multi-level converter for controlling the temperature of a plurality of submodules during operation of the MMC converter,

The submodule operation control device of the modular multi-level converter (MMC) according to the embodiment of the present invention is characterized in that the thermal image for the plurality of submodules participating in the operation and the plurality of standby submodules being paused during the operation of the MMC converter An infrared camera for photographing; A temperature extracting unit for extracting the temperature for each submodule from the photographed thermal image; A sequence of replacement sequence to be replaced in a submodule participating in the operation of the MMC converter according to the extracted temperature information of each submodule and a participation order to participate in the operation in the spare submodule; And a control unit for controlling the MMC converter to perform an operation by replacing and participating in submodules according to the order of replacement of the submodules participating in the operation and the order of participation of the spare submodules.

In the present invention, the temperature extracting unit extracts a temperature for each position of a plurality of parts located in the sub-module from the photographed thermal image.

In the present invention, the order determining unit determines the order of replacement according to the order in which the temperatures of the parts of the submodules participating in the operation of the MMC converter are higher than a predetermined first reference temperature for each position of the parts.

In the present invention, the order determining unit determines the order of participation according to the order in which the temperatures of the parts of the spare submodule of the MMC converter are lower than the predetermined second reference temperature for each position of the parts.

In the present invention, a plurality of submodules participating in the operation and a plurality of spare submodules waiting are stacked in a matrix of N and M (N and M are natural numbers), and the N × M submodule An XY-axis moving rail provided so as to be movable in the XY-axis direction with respect to the thermal imaging camera; And a movement control unit for controlling the movement of the thermal imaging camera on the X-Y-axis movement rails.

Further, a method of controlling a spare submodule operation control of a modular multi-level converter (MMC) according to an embodiment of the present invention includes a plurality of submodules participating in operation of an MMC converter in an infrared camera during operation of the MMC converter, Imaging the thermal image of the spare sub-module, respectively; Extracting temperatures of the plurality of submodules from the photographed thermal image at a temperature extracting unit; Determining a replacement sequence to be replaced in the submodule participating in the operation of the MMC converter and a participation order in which the spare submodule participates in operation according to the extracted temperature in the order determination unit; Controlling the MMC converter to perform an operation by replacing and participating in submodules according to the order of replacement of the submodules participating in the operation and the order of participation of the spare submodules in the control unit; .

In the present invention, the step of extracting the temperatures for each of the plurality of submodules extracts a temperature for each position of a plurality of parts located in the submodule from the photographed thermal image.

In the present invention, the determination of the replacement order determines the replacement order according to the order in which the temperatures of the parts of the submodules participating in the operation of the MMC converter are higher than the predetermined first reference temperature for respective positions of the components.

In the present invention, the order of insertion is determined according to the order in which the temperatures of the parts of the spare submodule of the MMC converter are lower than the predetermined second reference temperature for respective positions of the parts.

According to the present invention, since the state of the spare submodule can be confirmed in real time during the operation of the modular multi-level converter (MMC), it is possible to input from the good submodule, thereby improving the reliability of the MMC converter.

In addition, according to the present invention, since the status of a submodule in operation in real time can be confirmed during the operation of the modular multi-level converter (MMC), it is possible to confirm the replacement time of the submodule having a poor status, .

1 is a block diagram of a general MMC converter,
2 is a configuration diagram of a sub-module operation control device of an MMC converter according to the present invention,
3 is an exemplary layout of submodules of an MMC converter according to the present invention,
4 is a flowchart of a submodule operation control method of an MMC converter according to the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

2 is a configuration diagram of a sub-module operation control device of an MMC converter according to an embodiment of the present invention.

2, an operation control apparatus 100 (hereinafter referred to as an operation control apparatus) of a spare submodule of a modular multi-level converter (MMC) according to the present invention includes a thermal imaging camera 110, a temperature extracting unit 120 An order determination unit 130, and a control unit 140. [

The thermal imaging camera 110 photographs infrared images of a plurality of submodules 101 participating in the operation and a plurality of spare submodules 102 waiting to be operated during the operation of the MMC converter. The plurality of spare submodules 102 does not output a voltage but outputs the same switching signal as the submodule 101 participating in the operation in order to allow the submodule 101, which is participating in the operation, , A carrier signal and a control signal are applied, thereby performing the predetermined operation in the same manner. The thermal imaging camera 110 is provided to confirm the thermal state of the submodule, and may be implemented by, for example, an infrared camera.

The temperature extracting unit 120 extracts the temperatures of the respective sub-modules 101 and 102 from the thermal image captured by the thermal imaging camera 110. The temperature extracting unit 120 extracts the temperatures of the submodules 101 and 102 according to the positions of a plurality of components located inside the submodules 101 and 102 from the thermal image. To this end, the temperature extracting unit 120 analyzes a color pattern that varies depending on temperature for each position using a predetermined image processing technique for a thermal image. For example, the higher the temperature, the closer to red, and the lower the temperature, the closer to blue. The color has a data value corresponding to RGB. Each of the RGB values has color data of, for example, 0 to 255 steps, and a temperature according to the color pattern is extracted for each position by the combination of the color data. Each of the sub-modules 101 and 102 includes various components including a plurality of semiconductor switches, capacitors, and diodes, and these components are disposed at corresponding positions. When the submodules 101 and 102 are operated, internal components generate heat, so that the temperature is displayed in the thermal image captured by the thermal imaging camera 110 for each component position.

The order determining unit 130 determines the order of replacement among the plurality of submodules 101 participating in the operation of the MMC converter according to the temperature information of each of the submodules 101 and 102 extracted by the temperature extracting unit 120, The participation order to participate in the operation among the spare submodules 102 that are in operation. That is, the plurality of submodules 101 participating in the operation determine the order to be replaced according to the temperature of each of the submodules 101 and 102, and the spare submodule 102 determines the order in which the spare submodule 102 enters the MMC converter to participate in the operation will be. This means that the temperature of the submodule 101 is abnormally high in the submodules 101 and 102 as a whole or that the temperature of the submodule 101 is abnormally high in accordance with the positions of the internal components. Conversely, a relatively low temperature means that the condition is good. Accordingly, the submodules 101 participating in the operation using the temperature information of the submodule are changed in order of badness, and the spare submodule 102 is put into operation in a good order.

For this, in the embodiment of the present invention, the order determining unit 130 determines that the temperature of each part of the sub-module 101 participating in the operation of the MMC converter is higher than a predetermined first reference temperature And determines the order of participation according to the order in which the temperatures of the spare submodule components of the MMC converter are lower than the predetermined second reference temperature for each position of the component. Accordingly, the submodules 101 participating in the operation according to the temperature of the parts of the submodule are replaced in a bad state and the spare submodule 102 is allowed to participate in the operation in a good state.

The control unit 140 controls the MMC converter to perform the operation by replacing and participating in the submodules 101 and 102 according to the replacement order of the submodule 101 participating in the operation and the participation order of the standby spare submodule 102 do.

3 is an exemplary view of an arrangement of submodules of an MMC converter according to the present invention.

Referring to FIG. 3, a plurality of submodules 101 participating in the operation of the MMC converter according to the present invention and a plurality of standby spare submodules 102 waiting are arranged in a matrix of N horizontal lines and M vertical lines (N and M are natural numbers) Are stacked in a matrix form. At this time, the thermal imaging camera 110 allows the submodules 101 and 102 of N × M type to be photographed. To this end, in another embodiment of the present invention, the operation control apparatus 100 includes an XY-axis moving rail 210 installed to move the X-Y axis of the thermal imaging camera 110 relative to the N × M submodules 101 and 102, And a movement control unit 220 for controlling the movement of the thermal imaging camera 110 on the XY axis movement rail 210. [

The thermal imaging camera 110 can be moved left and right along the X-axis rail by the movement controller 220, and the X-axis rail can be moved up and down along the Y-axis rail. Thus, the thermal imaging camera 110 can photograph all the submodules 101 and 102 arranged in the N × M format.

4 is a flowchart illustrating a method of controlling an operation of a submodule of an MMC converter according to an embodiment of the present invention.

Referring to FIG. 4, in the operation control method of the submodule of the MMC converter according to the embodiment of the present invention, a plurality of submodules 101 participating in the operation of the MMC converter in the thermal imaging camera 110 during operation of the MMC converter, Images of a plurality of waiting spare submodules 102 are respectively photographed (S101). Although not shown in the figure, in step S101, the movement control unit 220 controls the thermal imaging camera 110 to photograph the sub-modules 101 and 102 arranged in N × M shapes, (110). Accordingly, the thermal imager 110 moves on the X-Y-axis moving rail 210 to take a thermal image.

Then, the temperature extracting unit 120 extracts the temperatures of the plurality of sub-modules 101 and 102 from the thermal image captured as described above (S103). This temperature extraction can use pre-set imaging processing techniques. At this time, the temperature extraction preferably extracts the temperatures from the photographed thermal image by the positions of a plurality of components located in the respective submodules (101, 102). Thus, not only can the overall temperature of the sub-modules 101 and 102 be checked, but also the temperature of each internal part can be checked.

Subsequently, in the order determining unit 130, the replacement order to be replaced in the plurality of submodules 101 participating in the operation of the MMC converter according to the extracted temperature and the number of standby submodules 102 (S105). ≪ / RTI > The determination of such a replacement order determines the temperature of the parts of the submodule 101 participating in the operation of the MMC converter according to the order of the positions of the parts that are higher than the predetermined first reference temperature. In addition, the determination of the order of participation allows the temperature of the parts of the spare submodule 102 of the MMC converter to be determined according to the order of the positions of the parts, lower than the predetermined second reference temperature.

Subsequently, the control unit 140 controls the MMC converter to perform the operation by replacing and participating in the corresponding sub-module according to the replacement order of the sub-module 101 participating in the operation and the participation order of the standby spare sub-module 102 (S107). In this way, the sub-module 101 is replaced in order of badness according to the temperature of the plurality of sub-modules 101 participating in the operation, and the status is changed according to the temperature of the plurality of spare sub- The submodule 102 is allowed to participate in the operation in place of the submodule 101 to be replaced in a good order.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

101: submodule participating in operation 102: spare submodule
110: thermal imager 120: temperature extracting unit
130: order determination unit 140:

Claims (9)

An infrared camera for photographing thermal images of a plurality of submodules participating in the operation and a plurality of spare submodules waiting during operation of the MMC converter;
A temperature extracting unit for extracting the temperature for each submodule from the thermal image;
A sequence of replacement sequence to be replaced in a submodule participating in the operation of the MMC converter according to the extracted temperature information of each submodule and a participation order to participate in the operation in the spare submodule; And
A control unit for controlling the MMC converter to perform operation by replacing and participating in submodules according to the replacement order of the submodules participating in the operation and the participation order of the spare submodule; Wherein the modular multi-level converter includes a plurality of modular multi-level converters. The method according to claim 1,
Wherein the temperature extracting unit extracts a temperature for each position of a plurality of components located within the sub-module from the photographed thermal image. 3. The method of claim 2,
Wherein the order determining unit determines the order of replacement according to the order of the temperatures of the parts of the submodules participating in the operation of the MMC converter, Control device. 3. The method of claim 2,
Wherein the order determining unit determines the order of participation according to the order in which the temperature of the spare submodule in the spare submodule of the MMC converter is lower than a predetermined second reference temperature for each position of the corresponding component. The method according to claim 1,
A plurality of submodules participating in the operation and a plurality of standby spare submodules are stacked in the form of a matrix of N horizontal lines and M vertical lines (N and M are natural numbers)
An XY-axis moving rail provided so that the thermal imaging camera is movable in the XY axis with respect to the N × M type submodule; And
A movement controller for controlling the movement of the thermal imaging camera on the XY-axis moving rails; Further comprising: a sub-module control unit for controlling the sub-module operation of the modular multi-level converter. Photographing a thermal image of a plurality of submodules participating in the operation of the MMC converter and a plurality of standby spare submodules in the thermal imaging camera during operation of the MMC converter, respectively;
Extracting temperatures of the plurality of submodules from the photographed thermal image at a temperature extracting unit;
Determining a replacement sequence to be replaced in the submodule participating in the operation of the MMC converter and a participation order in which the spare submodule participates in operation according to the extracted temperature in the order determination unit;
Controlling the MMC converter to perform an operation by replacing and participating in submodules according to the order of replacement of the submodules participating in the operation and the order of participation of the spare submodules in the control unit; Wherein the modular multi-level converter includes a plurality of modular multi-level converters. The method according to claim 6,
Wherein the extracting of the plurality of temperatures for each of the plurality of submodules comprises extracting temperatures of the plurality of components located within the submodule from the photographed thermal image. 8. The method of claim 7,
Wherein the determination of the replacement order is performed by the sub-module of the modular multi-level converter that determines the replacement order according to the order of the temperatures of the parts of the sub-modules participating in the operation of the MMC converter, Module operation control method. 8. The method of claim 7,
Wherein the determination of the order of participation is performed by determining the order of input according to the order in which the temperatures of the parts of the spare submodule of the MMC converter are lower than a predetermined second reference temperature for each position of the parts, Way.
KR1020150190344A 2015-12-30 2015-12-30 Operation control apparatus and method of redundant sub module in modular multilevel converter KR101774977B1 (en)

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PCT/KR2016/006637 WO2017115952A1 (en) 2015-12-30 2016-06-22 Operation control device and control method of submodule of modular multi-level converter

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CN107633112A (en) * 2017-08-17 2018-01-26 全球能源互联网研究院有限公司 A kind of MMC analysis method for reliability and device
CN107966623B (en) * 2017-10-25 2022-05-31 全球能源互联网研究院 Testing method, device and system of modular multilevel converter
CN107948941A (en) * 2017-10-30 2018-04-20 中国联合网络通信集团有限公司 A kind of method and apparatus of short message processing
CN112557960B (en) * 2020-12-31 2022-03-01 广东电网有限责任公司电力科学研究院 MMC converter submodule open-circuit fault positioning method and device
CN115273487A (en) * 2022-07-25 2022-11-01 深圳市分米互联科技有限公司 All-weather real-time intelligent traffic monitoring device based on Internet of things and cloud platform

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