CN109239440A - DC current sampling apparatus, method and modular multilevel converter system - Google Patents
DC current sampling apparatus, method and modular multilevel converter system Download PDFInfo
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- CN109239440A CN109239440A CN201811208418.6A CN201811208418A CN109239440A CN 109239440 A CN109239440 A CN 109239440A CN 201811208418 A CN201811208418 A CN 201811208418A CN 109239440 A CN109239440 A CN 109239440A
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- 238000005070 sampling Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 238000009825 accumulation Methods 0.000 claims description 18
- 238000002955 isolation Methods 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 11
- 230000001186 cumulative effect Effects 0.000 claims description 10
- 230000008054 signal transmission Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 9
- 241001604129 Polydactylus Species 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 4
- 206010016256 fatigue Diseases 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 12
- 238000009422 external insulation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
Abstract
The embodiment of the invention discloses a kind of DC current sampling apparatus, method and modular multilevel converter systems.The device includes: current detecting unit and converting unit；Current detecting unit includes multiple current detecting subelements in parallel, is respectively used to detect the electric current for flowing through partial high pressure bus rod in multiple current detecting subelements；Converting unit is connect with multiple current detecting subelements and valve control equipment respectively, for providing operating voltage for multiple current detecting subelements, and multiple current detecting subelements are detected that current signal is converted to voltage signal, and voltage signal adds up, the voltage signal after adding up is transferred to valve control equipment.DC current sampling apparatus, method and modular multilevel converter system provided in an embodiment of the present invention, multiple current detecting subelements respectively detect the electric current for flowing through partial high pressure bus rod, can carry out real-time sampling to electric current.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of DC current sampling apparatuses, method and modularization
Multilevel converter system.
Background technique
Currently, for the bridge of modularization multi-level converter (Modular Multilevel Converter, MMC) system
The current sample of arm mainly utilizes Hall current sensor to the electric current of high-tension cable bus rod or high pressure copper bar bus rod
Sampling, to improve current sample precision, save the cost.
As the power grade of valve control equipment is increasing, capacity is increasing, the outer diameter of high-tension cable and end
Parachute skirt is increasing, and the width and thickness of high pressure copper bar is increasing, and the internal diameter of Hall current sensor is smaller, makes
It cannot pass through Hall current sensor at high-tension cable bus rod or high pressure copper bar bus rod, and then can not achieve electric current
Real-time sampling.
Summary of the invention
The embodiment of the present invention provides a kind of DC current sampling apparatus, method and modular multilevel converter system, energy
It is enough that real-time sampling is carried out to electric current.
On the one hand, the embodiment of the present invention provides a kind of DC current sampling apparatus, and device includes: current detecting unit and turns
Change unit；
Current detecting unit includes multiple current detecting subelements in parallel, and multiple current detecting subelements are respectively used to pair
The electric current for flowing through partial high pressure bus rod is detected；Wherein, high pressure bus rod is whole female by multiple portions high pressure confluence
Line parallel connection is constituted；
Converting unit is connect with multiple current detecting subelements and valve control equipment respectively, for being that multiple current detectings are single
Member provides operating voltage, and multiple current detecting subelements are detected that current signal is converted to voltage signal, and by voltage
Signal adds up, and the voltage signal after adding up is transferred to valve control equipment.
In one embodiment of the invention, high pressure bus rod includes: that high-tension cable bus rod or high pressure copper bar converge
Flow bus.
In one embodiment of the invention, high pressure bus rod includes: high-tension cable bus rod；
Converting unit includes: Switching Power Supply and Hall current collection plate；
Hall current collection plate is connect with Switching Power Supply, multiple current detecting subelements and valve control equipment respectively, and being used for will
The voltage of Switching Power Supply output is supplied to multiple current detecting subelements and multiple current detecting subelements is detected electric current
Signal is converted to voltage signal, and voltage signal is added up, and the voltage signal after adding up is transferred to valve control equipment.
In one embodiment of the invention, high pressure bus rod includes: high pressure copper bar bus rod；
Converting unit includes: power supply subelement, isolating transformer, Switching Power Supply and Hall current collection plate；
The input terminal of isolating transformer is connect with power supply subelement, and the output end of isolating transformer is connect with Switching Power Supply,
For inputting the voltage by isolation to Switching Power Supply；
Hall current collection plate is connect with Switching Power Supply, multiple current detecting subelements and valve control equipment respectively, and being used for will
The voltage of Switching Power Supply output is supplied to multiple current detecting subelements and multiple current detecting subelements is detected electric current
Signal is converted to voltage signal, and voltage signal is added up, and the voltage signal after adding up is transferred to valve control equipment.
In one embodiment of the invention, Hall current collection plate includes: voltage output subelement, multiple electric currents to electricity
Press conversion subunit and voltage accumulation subelement；
Voltage output subelement is connect with Switching Power Supply and multiple current detecting subelements respectively, for Switching Power Supply is defeated
Voltage out is supplied to multiple current detecting subelements；
Multiple electric currents to each of voltage conversion subunit electric current to voltage conversion subunit respectively with multiple electric currents
Each of detection sub-unit current detecting subelement is connected with voltage accumulation subelement, for examining electric current connected to it
It surveys the collected current signal of subelement and is converted to voltage signal, and voltage signal is sent to voltage accumulation subelement；
Voltage accumulation subelement is also connect with valve control equipment, for adding up to voltage signal, and will it is cumulative after electricity
Pressure signal is transferred to valve control equipment.
In one embodiment of the invention, Hall current collection plate further include: electro-optic conversion subelement；
Electro-optic conversion subelement is connect with voltage accumulation subelement and valve control equipment respectively, for the voltage letter after adding up
Number optical signal transmission is converted to valve control equipment.
In one embodiment of the invention, converting unit is connect with valve control equipment by optical fiber, after being also used to add up
Voltage signal be converted to optical signal transmission to valve control equipment.
In one embodiment of the invention, current detecting subelement includes: Hall current sensor.
On the other hand, the embodiment of the present invention provides a kind of modular multilevel converter system, the modular multilevel change of current
Device system includes DC current sampling apparatus provided in an embodiment of the present invention.
In another aspect, the embodiment of the present invention provides a kind of DC current method of sampling, the DC current method of sampling includes:
Multiple current detecting subelements in parallel respectively detect the electric current for flowing through partial high pressure bus rod, and will
The current signal detected is sent to converting unit；Wherein, high pressure bus rod it is whole by multiple portions high pressure bus rod simultaneously
Connection is constituted；
The current signal that multiple current detecting subelements in parallel detect is converted to voltage signal by converting unit, and will
Voltage signal adds up, and the voltage signal after adding up is transferred to valve control equipment, to complete adopting for high pressure bus rod electric current
Sample.
In one embodiment of the invention, the electric current that converting unit detects multiple current detecting subelements in parallel
Signal is converted to voltage signal, and voltage signal is added up, and the voltage signal after adding up is transferred to valve control equipment, wraps
It includes:
Multiple current detecting subelements are detected that current signal is converted to by the Hall current collection plate that converting unit includes
Voltage signal, and voltage signal is added up, the voltage signal after adding up is transferred to valve control equipment.
In one embodiment of the invention, the Hall current collection plate that converting unit includes is single by multiple current detecting
Member detects that current signal is converted to voltage signal, and voltage signal is added up, and the voltage signal after adding up is transferred to
Valve control equipment, comprising:
Multiple electric currents that Hall current collection plate includes are to voltage conversion subunit respectively by current detecting connected to it
The collected current signal of subelement is converted to voltage signal, and voltage signal is sent to the electricity that Hall current collection plate includes
Press cumulative subelement；
Voltage accumulation subelement adds up to voltage signal, and will it is cumulative after voltage signal be transferred to valve control equipment.
In one embodiment of the invention, the DC current method of sampling further include:
Voltage signal after the electro-optic conversion subelement that Hall current collection plate includes will add up is converted to optical signal transmission
To valve control equipment.
In one embodiment of the invention, the DC current method of sampling further include:
Voltage signal after converting unit will add up is converted to optical signal transmission to valve control equipment.
DC current sampling apparatus, method and modular multilevel converter system provided in an embodiment of the present invention, it is multiple
Current detecting subelement respectively detects the electric current for flowing through partial high pressure bus rod, can be adopted in real time to electric current
Sample.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described, for those of ordinary skill in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 shows the first structural schematic diagram of DC current sampling apparatus provided in an embodiment of the present invention；
Fig. 2 shows second of structural schematic diagrams of DC current sampling apparatus provided in an embodiment of the present invention；
Fig. 3 shows the third structural schematic diagram of DC current sampling apparatus provided in an embodiment of the present invention；
Fig. 4 shows the 4th kind of structural schematic diagram of DC current sampling apparatus provided in an embodiment of the present invention；
Fig. 5 shows the 5th kind of structural schematic diagram of DC current sampling apparatus provided in an embodiment of the present invention；
Fig. 6 shows the flow diagram of the DC current method of sampling provided in an embodiment of the present invention.
Specific embodiment
Embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples.Following embodiment it is detailed
Thin description and attached drawing cannot be used to limit the scope of the invention for illustratively illustrating the principle of the present invention, i.e., of the invention
It is not limited to described embodiment.
In the description of the present invention, it should be noted that term " on ", "lower", "inner", "outside", " bottom end ", " top " etc.
The orientation or positional relationship of instruction is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and letter
Change description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construct and
Operation, therefore be not considered as limiting the invention.In addition, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indication or suggestion relative importance.In the description of the present invention, it is also necessary to explanation, unless otherwise specific rule
Fixed and restriction, term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, being also possible to can
Dismantling connection, or be integrally connected；It can be directly connected, it can also be indirectly connected through an intermediary.For this field
For those of ordinary skill, visual concrete condition understands the concrete meaning of above-mentioned term in the present invention.
Fig. 1 shows the first structural schematic diagram of DC current sampling apparatus provided in an embodiment of the present invention.Electric current is adopted
Sampling device 10 includes: current detecting unit 101 and converting unit 102.
Current detecting unit 101 includes multiple current detecting subelements 111 in parallel, multiple current detecting subelements 111
Each of current detecting subelement 111 be respectively used to detect the electric current for flowing through partial high pressure bus rod.
Wherein, high pressure bus rod is integrally made of multiple portions high pressure bus rod parallel connection.
Converting unit 102 is connect with multiple current detecting subelements 111 and valve control equipment 11 respectively, for being multiple electric currents
Detection sub-unit 111 provides operating voltage, and multiple current detecting subelements 111 are detected that current signal is converted to voltage
Signal, and voltage signal is added up, the voltage signal after adding up is transferred to valve control equipment 11.
Current sampling device provided in an embodiment of the present invention, multiple current detecting subelements respectively to flow through partial high pressure converge
The electric current of stream bus is detected, and can carry out real-time sampling to electric current.
In one embodiment of the invention, converting unit 102 can be connect with valve control equipment 11 by optical fiber, and conversion is single
Member 102 is also used to the voltage signal after adding up being converted to optical signal transmission to valve control equipment 11.
In one embodiment of the invention, high pressure bus rod may include: high-tension cable bus rod or high pressure copper
Arrange bus rod.
In one embodiment of the invention, if high pressure bus rod includes high-tension cable bus rod.Due to high-voltage electricity
The external insulation reliability of cable is higher, can satisfy the requirement of electrical isolation, and the mode without isolation power supply gives multiple electric currents
Power supply needed for detection sub-unit 111 provides work.Based on this, converting unit 102 includes: Switching Power Supply 121 and Hall current
Collection plate 122.As shown in Fig. 2,
Fig. 2 shows second of structural schematic diagrams of DC current sampling apparatus provided in an embodiment of the present invention.
Hall current collection plate 122 respectively with Switching Power Supply 121, multiple current detecting subelements 111 and valve control equipment 11
Connection, the voltage for exporting Switching Power Supply 121 are supplied to multiple current detecting subelements 111 and by multiple current detectings
Subelement 111 detects that current signal is converted to voltage signal, and voltage signal is added up, the voltage signal after adding up
It is transferred to valve control equipment 11.
In one embodiment of the invention, if high pressure bus rod includes high pressure copper bar bus rod.Due to high pressure copper
The voltage of row is higher, and external insulation reliability is poor, and it is impossible to meet the requirements of electrical isolation, it is therefore desirable to using isolation power supply
Power supply needed for mode provides work to multiple current detecting subelements 111.Based on this, converting unit 102 includes: Switching Power Supply
121, Hall current collection plate 122, power supply subelement 123 and isolating transformer 124.As shown in figure 3, Fig. 3 shows the present invention
The third structural schematic diagram for the DC current sampling apparatus that embodiment provides.
The input terminal of isolating transformer 124 is connect with power supply subelement 123, the output end and switch of isolating transformer 124
Power supply 121 connects, for inputting the voltage by isolation to Switching Power Supply 121.
Hall current collection plate 122 respectively with Switching Power Supply 121, multiple current detecting subelements 111 and valve control equipment 11
Connection, the voltage for exporting Switching Power Supply 121 are supplied to multiple current detecting subelements 111 and by multiple current detectings
Subelement 111 detects that current signal is converted to voltage signal, and voltage signal is added up, the voltage signal after adding up
It is transferred to valve control equipment 11.
Illustratively, power supply subelement 123 to isolating transformer 124 input one without isolation voltage (for example,
220 volts of alternating currents (VAC)).Isolating transformer 124 exports the voltage (for example, isolation 220VAC) by isolation and extremely switchs
Power supply 121.At this point, Switching Power Supply 121 inputs the voltage (isolation 220VAC) by isolation, the output of Switching Power Supply 121 one
A voltage (for example, isolation 15 volts of direct currents (VDC)) by isolation is to Hall current collection plate 122.Hall current collection plate
122 export the voltage (isolation 15VDC) of the isolation to multiple current detecting subelements 111.Multiple current detecting subelements 111
The voltage (isolation 15VDC) for inputting isolation is started to work afterwards.
It can be improved the safety of current sampling device by isolating transformer.
In one embodiment of the invention, Hall current collection plate 122 may include: voltage output subelement 1221,
Multiple electric currents are to voltage conversion subunit 1222 and voltage accumulation subelement 1223.Below using high pressure bus rod as high pressure copper bar
It is illustrated for bus rod.As shown in figure 4, Fig. 4 shows DC current sampling apparatus provided in an embodiment of the present invention
4th kind of structural schematic diagram.
Voltage output subelement 1221 is connect with Switching Power Supply 121 and multiple current detecting subelements 111 respectively, and being used for will
The voltage that Switching Power Supply 121 exports is supplied to multiple current detecting subelements 111.
Multiple electric currents to each of voltage conversion subunit 1222 electric current to voltage conversion subunit 1222 respectively with
Each of multiple current detecting subelements 111 current detecting subelement 111 and voltage accumulation subelement 1223 connect, and are used for
The collected current signal of current detecting subelement 111 connected to it is converted into voltage signal, and voltage signal is sent
To voltage accumulation subelement 1223.
Voltage accumulation subelement 1223 is also connect with valve control equipment 11, for adding up to voltage signal, and will be added up
Voltage signal afterwards is transferred to valve control equipment 11.
In one embodiment of the invention, Hall current collection plate 122 can also include: electro-optic conversion subelement
1224.It is illustrated so that high pressure bus rod is high pressure copper bar bus rod as an example further below.As shown in figure 5, Fig. 5 shows this
5th kind of structural schematic diagram of the DC current sampling apparatus that inventive embodiments provide.
Electro-optic conversion subelement 1224 is connect with voltage accumulation subelement 1223 and valve control equipment 11 respectively, for that will add up
Voltage signal afterwards is converted to optical signal transmission to valve control equipment 11.
It is understood that electro-optic conversion subelement 1224 is connect with valve control equipment 11 by optical fiber.
In one embodiment of the invention, current detecting subelement 111 may include: Hall current sensor.
DC current sampling apparatus provided in an embodiment of the present invention, each of multiple Hall current sensors Hall electricity
Flow sensor only detects the electric current for flowing through partial high pressure bus rod, and partial high pressure bus rod is passed through suddenly
That current sensor can carry out real-time sampling to electric current.
The embodiment of the present invention also provides a kind of modular multilevel converter system, modular multilevel converter system packet
Include DC current sampling apparatus provided in an embodiment of the present invention.
Modularization multi-level converter is cascaded by the identical submodule of multiple structures (Sub-module, SM) and is constituted.Usually
The system being made of modularization multi-level converter is referred to as modular multilevel converter system.
Based on foregoing description, the embodiment of the present invention also provides a kind of DC current method of sampling.The embodiment of the present invention provides
The DC current method of sampling utilize DC current sampling apparatus provided in an embodiment of the present invention.As shown in fig. 6, Fig. 6 is shown
The flow diagram of the DC current method of sampling provided in an embodiment of the present invention.The DC current method of sampling may include:
S601: the electric current for flowing through partial high pressure bus rod is examined respectively in multiple current detecting subelements in parallel
It surveys, and the current signal that will test is sent to converting unit.
Wherein, high pressure bus rod is integrally made of multiple portions high pressure bus rod parallel connection.
S602: the current signal that multiple current detecting subelements in parallel detect is converted to voltage and believed by converting unit
Number, and voltage signal is added up, the voltage signal after adding up is transferred to valve control equipment, to complete high pressure bus rod electricity
The sampling of stream.
In one embodiment of the invention, the electric current that converting unit detects multiple current detecting subelements in parallel
Signal is converted to voltage signal, and voltage signal is added up, and the voltage signal after adding up is transferred to valve control equipment, wraps
It includes:
Multiple current detecting subelements are detected that current signal is converted to by the Hall current collection plate that converting unit includes
Voltage signal, and voltage signal is added up, the voltage signal after adding up is transferred to valve control equipment.
In one embodiment of the invention, the Hall current collection plate that converting unit includes is single by multiple current detecting
Member detects that current signal is converted to voltage signal, and voltage signal is added up, and the voltage signal after adding up is transferred to
Valve control equipment, comprising:
Multiple electric currents that Hall current collection plate includes are to voltage conversion subunit respectively by current detecting connected to it
The collected current signal of subelement is converted to voltage signal, and voltage signal is sent to the electricity that Hall current collection plate includes
Press cumulative subelement；
Voltage accumulation subelement adds up to voltage signal, and will it is cumulative after voltage signal be transferred to valve control equipment.
In one embodiment of the invention, the DC current method of sampling further include:
Voltage signal after the electro-optic conversion subelement that Hall current collection plate includes will add up is converted to optical signal transmission
To valve control equipment.
In one embodiment of the invention, the DC current method of sampling further include:
Voltage signal after converting unit will add up is converted to optical signal transmission to valve control equipment.
The DC current method of sampling provided in an embodiment of the present invention, multiple current detecting subelements are respectively to flowing through part height
The electric current of pressure bus rod is detected, and can carry out real-time sampling to electric current.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as there is no structures to rush
Prominent, items technical characteristic mentioned in the various embodiments can be combined in any way.The invention is not limited to texts
Disclosed in specific embodiment, but include all technical solutions falling within the scope of the claims.
Claims (13)
1. a kind of DC current sampling apparatus, which is characterized in that described device includes: current detecting unit and converting unit；
The current detecting unit includes multiple current detecting subelements in parallel, and the multiple current detecting subelement is used respectively
It is detected in the electric current for flowing through partial high pressure bus rod；Wherein, high pressure bus rod is whole high by multiple parts
Bus rod parallel connection is pressed to constitute；
The converting unit is connect with the multiple current detecting subelement and valve control equipment respectively, for being the multiple electric current
Detection sub-unit provides operating voltage, and the multiple current detecting subelement is detected that current signal is converted to voltage letter
Number, and the voltage signal is added up, the voltage signal after adding up is transferred to the valve control equipment.
2. DC current sampling apparatus according to claim 1, which is characterized in that the high pressure bus rod includes: height
Voltage cable bus rod or high pressure copper bar bus rod.
3. DC current sampling apparatus according to claim 2, which is characterized in that the high pressure bus rod includes: height
Voltage cable bus rod；
The converting unit includes: Switching Power Supply and Hall current collection plate；
The Hall current collection plate respectively with the Switching Power Supply, the multiple current detecting subelement and the valve control equipment
Connection, the voltage for exporting the Switching Power Supply are supplied to the multiple current detecting subelement and by the multiple electricity
Stream detection sub-unit detects that current signal is converted to voltage signal, and the voltage signal is added up, after cumulative
Voltage signal is transferred to the valve control equipment.
4. DC current sampling apparatus according to claim 2, which is characterized in that the high pressure bus rod includes: height
Press copper bar bus rod；
The converting unit includes: power supply subelement, isolating transformer, Switching Power Supply and Hall current collection plate；
The input terminal of the isolating transformer is connect with the power supply subelement, and the output end of the isolating transformer is opened with described
Powered-down source connection, for inputting the voltage by isolation to the Switching Power Supply；
The Hall current collection plate respectively with the Switching Power Supply, the multiple current detecting subelement and the valve control equipment
Connection, the voltage for exporting the Switching Power Supply are supplied to the multiple current detecting subelement and by the multiple electricity
Stream detection sub-unit detects that current signal is converted to voltage signal, and the voltage signal is added up, after cumulative
Voltage signal is transferred to the valve control equipment.
5. DC current sampling apparatus according to claim 3 or 4, which is characterized in that the Hall current collection plate packet
It includes: voltage output subelement, multiple electric currents to voltage conversion subunit and voltage accumulation subelement；
The voltage output subelement is connect with the Switching Power Supply and the multiple current detecting subelement respectively, is used for institute
The voltage for stating Switching Power Supply output is supplied to the multiple current detecting subelement；
The multiple electric current to each of voltage conversion subunit electric current to voltage conversion subunit respectively with it is the multiple
Each of current detecting subelement current detecting subelement is connected with the voltage accumulation subelement, for that will be connected thereto
The collected current signal of current detecting subelement be converted to voltage signal, and the voltage signal is sent to the voltage
Cumulative subelement；
The voltage accumulation subelement is also connect with the valve control equipment, for adding up to the voltage signal, and will be tired out
Voltage signal after adding is transferred to the valve control equipment.
6. DC current sampling apparatus according to claim 5, which is characterized in that the Hall current collection plate also wraps
It includes: electro-optic conversion subelement；
The electro-optic conversion subelement is connect with the voltage accumulation subelement and the valve control equipment respectively, for that described will tire out
Voltage signal after adding is converted to optical signal transmission to the valve control equipment.
7. DC current sampling apparatus according to claim 1, which is characterized in that the converting unit is set with the valve control
It is standby to be connected by optical fiber, it is also used to the voltage signal after described add up being converted to optical signal transmission to the valve control equipment.
8. DC current sampling apparatus according to claim 1, which is characterized in that the current detecting subelement is Hall
Current sensor.
9. a kind of modular multilevel converter system, which is characterized in that the modular multilevel converter system includes power
Benefit requires 1 to 8 described in any item DC current sampling apparatuses.
10. a kind of DC current method of sampling, which is characterized in that the described method includes:
Multiple current detecting subelements in parallel respectively detect the electric current for flowing through partial high pressure bus rod, and will test
To current signal be sent to converting unit；Wherein, high pressure bus rod it is whole by multiple partial high pressure bus rods simultaneously
Connection is constituted；
The current signal that multiple current detecting subelements of the parallel connection detect respectively is converted to voltage by the converting unit
Signal, and voltage signal is added up, the voltage signal after adding up is transferred to valve control equipment, to complete high pressure bus rod
The sampling of electric current.
11. the DC current method of sampling according to claim 10, which is characterized in that the converting unit is by the parallel connection
The current signal that detects of multiple current detecting subelements be converted to voltage signal, and voltage signal is added up, will be tired out
Voltage signal after adding is transferred to valve control equipment, comprising:
The multiple current detecting subelement is detected that current signal turns by the Hall current collection plate that the converting unit includes
It is changed to voltage signal, and the voltage signal is added up, the voltage signal after adding up is transferred to the valve control equipment.
12. the DC current method of sampling according to claim 11, which is characterized in that the Hall that the converting unit includes
The multiple current detecting subelement is detected that current signal is converted to voltage signal by current acquisition plate, and the voltage is believed
Number add up, will it is cumulative after voltage signal be transferred to the valve control equipment, comprising:
Multiple electric currents that the Hall current collection plate includes are to voltage conversion subunit respectively by current detecting connected to it
The collected current signal of subelement is converted to voltage signal, and the voltage signal is sent to the Hall current collection plate
Including voltage accumulation subelement；
The voltage accumulation subelement adds up to the voltage signal, and will it is cumulative after voltage signal be transferred to the valve
Control equipment.
13. the DC current method of sampling according to claim 12, which is characterized in that the method also includes:
Voltage signal after described add up is converted to optical signal by the electro-optic conversion subelement that the Hall current collection plate includes
It is transferred to the valve control equipment.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505365A (en) * | 2020-03-31 | 2020-08-07 | 上海交通大学 | Modular multilevel converter station current signal acquisition system and method |
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| JPH0926444A (en) * | 1995-07-13 | 1997-01-28 | Toshiba Syst Technol Kk | Dc current detection device |
| JPH0984268A (en) * | 1995-09-18 | 1997-03-28 | Toshiba Syst Technol Kk | Controller for ac-dc converter |
| CN101702097A (en) * | 2009-11-25 | 2010-05-05 | 浪潮电子信息产业股份有限公司 | Energy-saving power supply system |
| CN203813702U (en) * | 2014-04-26 | 2014-09-03 | 襄阳赛克斯电气股份有限公司 | Explosion-proof high-pressure solid-state soft starter |
| CN205506923U (en) * | 2016-03-18 | 2016-08-24 | 广州粤能电力科技开发有限公司 | Transformer neutral point direct current measuring device |
| CN209102798U (en) * | 2018-10-17 | 2019-07-12 | 新疆金风科技股份有限公司 | DC current sampling apparatus and modular multilevel converter system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505365A (en) * | 2020-03-31 | 2020-08-07 | 上海交通大学 | Modular multilevel converter station current signal acquisition system and method |
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