CN106546852A - A kind of MMC converter valves Tests at Steady State circuit and its control method - Google Patents
A kind of MMC converter valves Tests at Steady State circuit and its control method Download PDFInfo
- Publication number
- CN106546852A CN106546852A CN201610943410.9A CN201610943410A CN106546852A CN 106546852 A CN106546852 A CN 106546852A CN 201610943410 A CN201610943410 A CN 201610943410A CN 106546852 A CN106546852 A CN 106546852A
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- Prior art keywords
- bridge arm
- facies unit
- steady state
- mmc converter
- unit
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Classifications
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- 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
Abstract
The invention provides a kind of MMC converter valves Tests at Steady State circuit and its control method, the hookup includes load impedance, and distinguishes DC power source unit in parallel, the first facies unit and the second facies unit；The bridge arm of first facies unit and the second facies unit including two series connection；Load impedance is connected between the bridge arm junction point of bridge arm junction point and the second facies unit of the first facies unit.Compared with prior art, a kind of MMC converter valves Tests at Steady State circuit and its control method that the present invention is provided, which is caused to possess a plurality of power transmission loop using H bridge constructions, it is easy to break up AC power loop and dc power loop, while the hookup causes hookup operation simpler only with a power supply.
Description
Technical field
The present invention relates to Technology of HVDC based Voltage Source Converter field, and in particular to a kind of MMC converter valves Tests at Steady State circuit
And its control method.
Background technology
High voltage dc transmission technology (Voltage Sourced Converter based based on voltage source converter
HVDC, VSC-HVDC) inverter mainly using two level, three level, clamped multi-level topological structure and modularity it is how electric
Flat topological structure.Wherein, using modularization multi-level converter (the Modular Multi- of modular multilevel topological structure
Level Converter, MMC) as its switching device operating frequency is low, the advantages of output voltage waveforms are close to sine wave more
It is widely used in flexible direct current power transmission system.Therefore, in order to the reliability for improving flexible direct current power transmission system needs to change MMC
Stream valve carries out strict type approval test.In type approval test at present, whether Tests at Steady State is to check MMC converter valves
The important means of continuous and steady operation, it is main to include maximum continuous service test, maximum transient overload trial and minimum direct current
The pilot projects such as voltage test.
The test method of Tests at Steady State mainly includes conventional method, DC experiment method and equivalent test method.
1st, conventional methods
As MMC converter valves are using the modular multilevel topological structure being made up of power electronic devices, the structure with it is normal
The power equipment of rule is entirely different, therefore the test method suitable for conventional electric power equipment is no longer desirable for MMC converter valves.
2nd, DC experiment method
As MMC converter valves have the characteristics of voltage is high, electric current is big, therefore cannot be built using straightway testing method and real
Tested operating condition on all four test loop in border.
3rd, equivalent test method
At present, the hookup of the equivalent test method of MMC converter valves includes two MMC bridge arms and a complementary energy to dragging
Power supply.In process of the test, the AC and DC Power Exchange of hookup is completed in same circuit, and the reality of MMC converter valves should
Completed in different circuits with middle AC and DC Power Exchange so that the circulating current of the hookup and submodule electric capacity electricity
The wave characteristic of pressure has relatively large deviation with practical situation, causes the extra switch action of MMC change of current valve samples with real work not
Together, reduce carries out the equivalence of equivalent test examination to MMC converter valves.
The content of the invention
In order to overcome the defect of prior art, the invention provides a kind of MMC converter valves Tests at Steady State circuit and its
Control method.
In a first aspect, a kind of technical scheme of MMC converter valves Tests at Steady State circuit is in the present invention：
The hookup includes load impedance, and DC power source unit in parallel respectively, the first facies unit and the second phase
Unit；
The bridge arm of first facies unit and the second facies unit including two series connection；
The bridge arm of bridge arm junction point and second facies unit that the load impedance is connected to first facies unit connects
Between contact.
Further, an optimal technical scheme of present invention offer is：
The DC power source unit includes DC source and the smoothing reactor connected.
Further, an optimal technical scheme of present invention offer is：
The bridge arm includes valve module and the bridge arm reactor connected, and the valve module includes the power submodule of multiple series connection
Block.
Further, an optimal technical scheme of present invention offer is：
The power modules quantity that all bridge arms are included in the hookup is identical.
Further, an optimal technical scheme of present invention offer is：
Valve module in the bridge arm includes the power modules of at least 5 series connection；Or,
The quantitative range of the power modules that the valve module in the bridge arm is included is 10～20.
Second aspect, in the present invention, the technical scheme of the control method of MMC converter valve Tests at Steady State circuits is：
The control method includes：
Control the DC power source unit to charge to each bridge arm according to default DC voltage reference waveform, work as charging complete
After control each bridge arm according to default Voltage Reference waveform output voltage；
The alternating current voltage component of first facies unit and the second facies unit is obtained, and increases two alternating voltages point
The phase angle difference of amount, so as to form AC power loop and dc power respectively between first facies unit and the second facies unit
Loop；
Adjust the DC power source unit and the default Voltage Reference waveform so that the test electricity of the hookup
Stream reaches its desired value.
Further, an optimal technical scheme of present invention offer is：
The control DC power source unit charges to each bridge arm and includes：Filled to each bridge arm simultaneously by the way of DC chopped-wave
Electricity.
Further, an optimal technical scheme of present invention offer is：The test current includes the hookup
Exchange
Electric current and DC current；
The regulation alternating current reaches its desired value to be included：Adjust the exchange of first facies unit and the second facies unit
The amplitude and phase angle difference of component of voltage；
The regulation DC current reaches its desired value to be included：The DC voltage for controlling the DC power source unit output reaches
To its expected value.
Further, an optimal technical scheme of present invention offer is：MMC converter valves are completed according to the hookup
Include after Tests at Steady State：
The phase angle difference of alternating current voltage component of first facies unit and the second facies unit is gradually reduced to zero；
The each bridge arm of locking simultaneously turns off the DC power source unit.
Compared with immediate prior art, the invention has the beneficial effects as follows：
1st, a kind of MMC converter valves Tests at Steady State circuit that the present invention is provided, causes which to possess using H bridge constructions a plurality of
Power transmission loop, is easy to break up AC power loop and dc power loop, while hookup includes filling in prior art
Two power supplys of power supply and complementary energy power supply, and the hookup causes hookup operation simpler only with a power supply；
2nd, the control method of a kind of MMC converter valves Tests at Steady State circuit that the present invention is provided, by increasing the first phase
The phase angle difference of the alternating current voltage component of unit and the second facies unit, can distinguish shape between the first facies unit and the second facies unit
Into exchange loop of power circuit and dc power loop, so that AC power and dc power are in different loops in hookup
Middle transmission, it is consistent with the actual condition of MMC test product valves, improve the equivalence of hookup.
Description of the drawings
Fig. 1：A kind of MMC converter valves Tests at Steady State circuit diagram in the embodiment of the present invention；
Fig. 2：A kind of control method implementing procedure figure of MMC converter valves Tests at Steady State circuit in the embodiment of the present invention；
Fig. 3：Each facies unit alternating voltage waveform schematic diagram in the embodiment of the present invention；
Fig. 4：MMC test product valves voltage current waveform schematic diagram in the embodiment of the present invention.
Specific embodiment
To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely illustrated, it is clear that described embodiment is
The a part of embodiment of the present invention, rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Accompanying drawing is combined separately below, and a kind of MMC converter valves Tests at Steady State circuit provided in an embodiment of the present invention is entered
Row explanation.
Fig. 1 is a kind of MMC converter valves Tests at Steady State circuit diagram in the embodiment of the present invention, as illustrated, this reality
In applying example, MMC converter valve Tests at Steady State circuits include that load impedance, DC power source unit, the first facies unit and second are mutually single
Unit.Wherein,
DC power source unit, the first facies unit and the second facies unit are in parallel respectively.
The bridge arm of first facies unit and the second facies unit including two series connection, load impedance are connected to the first facies unit
Between the bridge arm junction point of bridge arm junction point and the second facies unit.
In the present embodiment, hookup causes which to possess a plurality of power transmission loop using H bridge constructions, is easy to differentiation exchange
Loop of power circuit and dc power loop, while hookup includes two power supplys of charge power supply and complementary energy power supply in prior art,
And the hookup causes hookup operation simpler only with a power supply.
Further, in the present embodiment, DC power source unit can also include following structures.
In the present embodiment, DC power source unit includes DC source and the smoothing reactor connected, and the DC power source unit was both
For charging to each bridge arm of hookup, it is additionally operable in hookup running to each bridge arm electric energy supplement.
Further, the present embodiment bridge arm can also include following structures.
The present embodiment bridge arm includes valve module and the bridge arm reactor connected.Wherein,
Valve module includes the power modules of multiple series connection, and the power modules quantity that all bridge arms are included is identical.This
In embodiment, the quantity of valve module internal power submodule can be at least 5, or and 10～20.
Present invention also offers a kind of control method of MMC converter valves Tests at Steady State circuit, and be given and be embodied as.
Fig. 2 is a kind of control method implementing procedure figure of MMC converter valves Tests at Steady State circuit in the embodiment of the present invention,
As illustrated, the control method of MMC converter valves Tests at Steady State circuit can be implemented as steps described below in the present embodiment, tool
Body is：
Step S101：Control DC power source unit charges to each bridge arm according to default DC voltage reference waveform, when filling
Each bridge arm is controlled after the completion of electricity according to default Voltage Reference waveform output voltage.
Step S102：The alternating current voltage component of the first facies unit and the second facies unit is obtained, and increases two alternating voltages
The phase angle difference of component, returns so as to form AC power loop and dc power between the first facies unit and the second facies unit respectively
Road.
Step S103：Adjust the DC voltage and default Voltage Reference waveform of DC power source unit output so that test
The test current of circuit reaches its desired value, and in the present embodiment, test current refers to DC current in hookup and exchanges
Electric current.
By the first facies unit of increase and the phase angle difference of the alternating current voltage component of the second facies unit, Ke Yi in the present embodiment
Form AC power loop and dc power loop between first facies unit and the second facies unit respectively, so that hookup
Middle AC power and dc power are transmitted in different loops, consistent with the actual condition of MMC test product valves, improve test electricity
The equivalence on road.
Further, in the present embodiment, step S101 can be implemented using following methods.
Can be being charged to each bridge arm by the way of DC chopped-wave simultaneously in the present embodiment.
Further, in the present embodiment, step S102 can be implemented using following methods.
In the present embodiment, test current includes the alternating current and DC current of hookup, then adjust alternating current and reach
Its desired value includes the amplitude and phase angle difference of the alternating current voltage component for adjusting the first facies unit and the second facies unit, so as to change friendship
Stream voltage reaches desired value；Adjust DC current and reach the unidirectional current that its desired value includes that control DC power source unit is exported
Pressure reaches expected value, so that DC current reaches its desired value.
Fig. 3 is each facies unit alternating voltage waveform schematic diagram in the embodiment of the present invention, as illustrated, U in the present embodimentaFor
The output voltage of the first facies unit, UbFor the output voltage of the second facies unit, the output voltage waveforms of each facies unit are exchange
Voltage and DC voltage are superimposed the staircase waveform to be formed；δ is the phase angle of the alternating current voltage component of the first facies unit and the second facies unit
Difference；Reference wave is default Voltage Reference waveform in step S101, and the bridge arm of each facies unit is according to the reference wave output voltage.
Fig. 4 is MMC test product valve voltage current waveform schematic diagrams in the embodiment of the present invention, as illustrated, dividing in the present embodiment
Other UdcAnd IdcThe respectively DC voltage and DC current of hookup, ubAnd ibSecond facies unit respectively in hookup
Alternating voltage and alternating current,For the phase place of the alternating current.
End test after foundation hookup completes MMC converter valve Tests at Steady State in the present embodiment can be according to following
Method is implemented：Be gradually reduced first the first facies unit and the second facies unit alternating current voltage component phase angle difference to zero with reduce examination
Galvanoscope, then each bridge arm of locking turns off DC power source unit.
Obviously, those skilled in the art can carry out the essence of various changes and modification without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (9)
1. a kind of MMC converter valves Tests at Steady State circuit, it is characterised in that the hookup includes load impedance, and
Difference DC power source unit in parallel, the first facies unit and the second facies unit；
The bridge arm of first facies unit and the second facies unit including two series connection；
The load impedance is connected to the bridge arm junction point of first facies unit and the bridge arm junction point of second facies unit
Between.
2. a kind of MMC converter valves Tests at Steady State circuit as claimed in claim 1, it is characterised in that
The DC power source unit includes DC source and the smoothing reactor connected.
3. a kind of MMC converter valves Tests at Steady State circuit as claimed in claim 1, it is characterised in that
The bridge arm includes valve module and the bridge arm reactor connected, and the valve module includes the power modules of multiple series connection.
4. a kind of MMC converter valves Tests at Steady State circuit as claimed in claim 3, it is characterised in that
The power modules quantity that all bridge arms are included in the hookup is identical.
5. a kind of MMC converter valves Tests at Steady State circuit as claimed in claim 3, it is characterised in that
Valve module in the bridge arm includes the power modules of at least 5 series connection；Or,
The quantitative range of the power modules that the valve module in the bridge arm is included is 10～20.
6. a kind of control method of the MMC converter valve Tests at Steady State circuits as described in any one of claim 1-5, its feature
It is that the control method includes：
Control the DC power source unit to charge to each bridge arm according to default DC voltage reference waveform, control after charging complete
Each bridge arm is made according to default Voltage Reference waveform output voltage；
The alternating current voltage component of first facies unit and the second facies unit is obtained, and increases two alternating current voltage components
Phase angle difference, returns so as to form AC power loop and dc power between first facies unit and the second facies unit respectively
Road；
Adjust the DC power source unit and the default Voltage Reference waveform so that the test current of the hookup reaches
To its desired value.
7. a kind of control method of MMC converter valves Tests at Steady State circuit as claimed in claim 6, it is characterised in that institute
Stating control DC power source unit and charging to each bridge arm includes：Charged to each bridge arm simultaneously by the way of DC chopped-wave.
8. a kind of control method of MMC converter valves Tests at Steady State circuit as claimed in claim 6, it is characterised in that
The test current includes the alternating current and DC current of the hookup；
The regulation alternating current reaches its desired value to be included：Adjust the alternating voltage of first facies unit and the second facies unit
The amplitude and phase angle difference of component；
The regulation DC current reaches its desired value to be included：The DC voltage for controlling the DC power source unit output reaches which
Expected value.
9. a kind of control method of MMC converter valves Tests at Steady State circuit as claimed in claim 6, it is characterised in that according to
Include after MMC converter valve Tests at Steady State is completed according to the hookup：
The phase angle difference of alternating current voltage component of first facies unit and the second facies unit is gradually reduced to zero；
The each bridge arm of locking simultaneously turns off the DC power source unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610943410.9A CN106546852A (en) | 2016-11-01 | 2016-11-01 | A kind of MMC converter valves Tests at Steady State circuit and its control method |
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|---|---|---|---|
| CN201610943410.9A CN106546852A (en) | 2016-11-01 | 2016-11-01 | A kind of MMC converter valves Tests at Steady State circuit and its control method |
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| CN201610943410.9A Pending CN106546852A (en) | 2016-11-01 | 2016-11-01 | A kind of MMC converter valves Tests at Steady State circuit and its control method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107464482A (en) * | 2017-06-09 | 2017-12-12 | 全球能源互联网研究院有限公司 | A kind of flexible direct current power network dynamic analog circuit |
| CN107966623A (en) * | 2017-10-25 | 2018-04-27 | 全球能源互联网研究院 | A kind of test method of modularization multi-level converter, apparatus and system |
| CN110867885A (en) * | 2019-11-26 | 2020-03-06 | 全球能源互联网研究院有限公司 | Submodule alternation control method of direct current energy consumption device |
| CN111398772A (en) * | 2020-04-14 | 2020-07-10 | 许继电气股份有限公司 | Circuit, method and device for converter valve overcurrent turn-off test |
| CN111505419A (en) * | 2020-04-28 | 2020-08-07 | 南方电网科学研究院有限责任公司 | Opposite impact test circuit for SiC MMC valve section and control method, system and equipment thereof |
| CN114019272A (en) * | 2021-10-18 | 2022-02-08 | 清华大学 | Current converter test circuit and test method |
| CN114062859A (en) * | 2021-10-29 | 2022-02-18 | 广东电网有限责任公司广州供电局 | Converter valve voltage equalizing method and device, controller and storage medium |
| CN114167272A (en) * | 2021-12-03 | 2022-03-11 | 广东电网有限责任公司 | Flexible direct current converter valve steady-state operation test device and method |
| CN114167272B (en) * | 2021-12-03 | 2024-04-12 | 广东电网有限责任公司 | Flexible direct current converter valve steady-state operation test device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107464482A (en) * | 2017-06-09 | 2017-12-12 | 全球能源互联网研究院有限公司 | A kind of flexible direct current power network dynamic analog circuit |
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| CN111505419A (en) * | 2020-04-28 | 2020-08-07 | 南方电网科学研究院有限责任公司 | Opposite impact test circuit for SiC MMC valve section and control method, system and equipment thereof |
| CN111505419B (en) * | 2020-04-28 | 2022-06-17 | 南方电网科学研究院有限责任公司 | Opposite impact test circuit for SiC MMC valve section and control method, system and equipment thereof |
| CN114019272A (en) * | 2021-10-18 | 2022-02-08 | 清华大学 | Current converter test circuit and test method |
| CN114062859A (en) * | 2021-10-29 | 2022-02-18 | 广东电网有限责任公司广州供电局 | Converter valve voltage equalizing method and device, controller and storage medium |
| CN114062859B (en) * | 2021-10-29 | 2023-08-04 | 广东电网有限责任公司广州供电局 | Equalizing method and device for converter valve, controller and storage medium |
| CN114167272A (en) * | 2021-12-03 | 2022-03-11 | 广东电网有限责任公司 | Flexible direct current converter valve steady-state operation test device and method |
| CN114167272B (en) * | 2021-12-03 | 2024-04-12 | 广东电网有限责任公司 | Flexible direct current converter valve steady-state operation test device and method |
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Effective date of registration: 20170919 Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Applicant after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Address before: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Applicant before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Applicant before: State Grid Corporation of China |
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Application publication date: 20170329 |