CN207490790U - A kind of valve group cascade operating structure based on mixed type MMC - Google Patents
A kind of valve group cascade operating structure based on mixed type MMC Download PDFInfo
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- CN207490790U CN207490790U CN201721597588.9U CN201721597588U CN207490790U CN 207490790 U CN207490790 U CN 207490790U CN 201721597588 U CN201721597588 U CN 201721597588U CN 207490790 U CN207490790 U CN 207490790U
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- valve group
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Abstract
The utility model discloses the valve groups based on mixed type MMC to cascade operating structure, including cascade high pressure valve group and low pressure valve group；High pressure valve group includes mixed type module multilevel converter MMC1, and low pressure valve group includes mixed type module multilevel converter MMC2；In exchange side, the three-phase alternating current outlet of high pressure valve group, low pressure valve group is connected correspondingly with exchanging the three-phase alternating current of common bus and exporting respectively；In DC side, the direct-flow positive pole of high pressure valve group is connected with positive electrode bus, and the direct current cathode of high pressure valve group is connected with the direct-flow positive pole of low pressure valve group, and the direct current cathode of low pressure valve group is connected with negative electrode bus.In DC side, the voltage-to-ground grade of high pressure valve group is higher than the voltage-to-ground grade of low pressure valve group.The utility model effectively reduces the quantity of submodule that every bridge arm is connected in single mixed type MMC, effectively promotes voltage class and power capacity, effectively avoids increasing the complexity of control system, and improves the reliability of power supply.
Description
Technical field
The utility model belongs to electric system transmission ＆ distribution electro-technical field, more particularly, to a kind of based on mixed type MMC's
Valve group cascades operating structure.
Background technology
Modularization multi-level converter (Modular multilevel converter, MMC) have modular construction, easily
In expand the advantages that, be widely used in flexible direct-current transmission field.In all kinds of MMC topologys, based on bridge-type
Module (Full bridge sub-module, FBSM) and semi-bridge type submodule (Half bridge sub-module, HBSM)
Mixed type MMC have good control characteristic, can be in DC Line Fault not by using AC and DC decoupling control method
Latch switch device IGBT, DC Line Fault is passed through, is a kind of scheme for having application prospect.
Fig. 1 show the topological structure schematic diagram of existing mixed type MMC and its submodule.The topology knot of mixed type MMC
Structure, as shown in Fig. 1 (a), including three-phase, totally six bridge arms, every bridge arm are connected in series by submodule, and wherein half submodule is
Bridge-type submodule, the other half is semi-bridge type submodule；Bridge-type submodule, as shown in Fig. 1 (b), including four switching devices；
Semi-bridge type submodule, as shown in Fig. 1 (c), including two switching devices；Every bridge arm of mixed type MMC, which contains, to be exported
The submodule of negative voltage can adjust DC voltage while bridge arm submodule capacitor voltage remains specified.
But existing mixed type MMC, there are following technical problems：(1) under the application scenario of high-voltage large-capacity, every
The submodule number that bridge arm is connected can dramatically increase；(2) the pressure-resistant flow-resistant capacity of switching device is limited, and therefore, it is difficult to effectively carry
Up voltage grade and power capacity so that mixed type MMC may be only available for limited application scenarios；(3) when increasing submodule number,
It needs to increase the dimension and complexity for controlling signal, and then need to correspondingly improve the arithmetic speed of control system；(4) operation side
Formula is single, and when a certain bridge arm breaks down, entire current conversion station must be out of service.
Invention content
In view of the drawbacks of the prior art and Improvement requirement, the utility model provide a kind of valve group based on mixed type MMC
Cascade operating structure.
According to the one side of the utility model, a kind of valve group cascade operating structure based on mixed type MMC, packet are provided
It includes：Cascade high pressure valve group and low pressure valve group；High pressure valve group includes：Mixed type module multilevel converter MMC1；Low pressure valve
Group includes：Mixed type module multilevel converter MMC2；High pressure valve group is in parallel with the exchange side of low pressure valve group, DC side string
Connection；In DC side, the voltage-to-ground grade of high pressure valve group is higher than the voltage-to-ground grade of low pressure valve group.
Further, in exchange side, the three-phase alternating current outlet of high pressure valve group includes：A1 phases, b1 phases and c1 phases, low pressure valve
The three-phase alternating current outlet of group includes：A2 phases, b2 phases and c2 phases；A1 phases are connected with exchanging a phases of common bus, and b1 phases are with exchanging
The b phases of common bus are connected, and c1 phases are connected with exchanging the c phases of common bus；A2 phases are connected with exchanging a phases of common bus
It connects, b2 phases are connected with exchanging the b phases of common bus, and c2 phases are connected with exchanging the c phases of common bus；
Further, in DC side, the direct-flow positive pole of high pressure valve group is connected with positive electrode bus, the direct current of high pressure valve group
Cathode is connected with the direct-flow positive pole of low pressure valve group；The direct-flow positive pole of low pressure valve group is connected with the direct current cathode of high pressure valve group,
The direct current cathode of low pressure valve group is connected with negative electrode bus.
Further, high pressure valve group is with using duplicate circuit topology and control strategy inside low pressure valve group.
Further, high pressure valve group and low pressure valve group receive complete phase using identical a set of controller system
Same control instruction, so as to reduce the complexity of control system.
Further, high pressure valve group and low pressure valve group are controlled using AC/DC decoupling, control respectively alternating current and
DC current so that the independence bigger controlled between two valve groups reduces the degree of coupling between valve group.
Further, valve group voltage-stabilizing controller is additionally provided between high pressure valve group and low pressure valve group so that high pressure valve
Group is identical with the DC voltage of low pressure valve group, and power transmission equilibrium between two valve groups is shared, so as to ensure each valve
The safety and stabilization of group.
Further, valve group voltage-stabilizing controller includes：Signed magnitude arithmetic(al) unit, multiplying unit and MMC work(
Rate control unit；
The first input end of signed magnitude arithmetic(al) unit is used to receive the DC voltage U of high pressure valve groupdcpu1, signed magnitude arithmetic(al) list
Second input terminal of member is used to receive the DC voltage U of low pressure valve groupdcpu2, signed magnitude arithmetic(al) unit is used for the straight of high pressure valve group
Galvanic electricity presses Udcpu1With the DC voltage U of low pressure valve groupdcpu2The first operation result is obtained after subtracting each other；
The first input end of multiplying unit is connected to the output terminal of signed magnitude arithmetic(al) unit, and the of multiplying unit
Two input terminals are used to receive external given Proportional coefficient KP, multiplying unit is used for the first operation result and proportionality coefficient
KPPower compensating value is obtained after multiplication；
The input terminal of MMC power control units is connected to the output terminal of multiplying unit, and MMC power control units are used for
The trigger signal of submodule switching device is obtained according to power compensating value.
Further, rule of thumb, Proportional coefficient KPValue range between -2~+2；Proportional coefficient KPIt is specific
Value is obtained according to emulation.
Further, the valve group cascade operating structure based on mixed type MMC, can cascade more than two mixed types
MMC, each mixed type MMC forms a valve group in cascade structure；It, can be by cascading more under fixed DC bus-bar voltage
More valve groups reduces the DC voltage of each valve group；
Further, the valve group cascade operating structure based on mixed type MMC, can be by cascading multiple voltage class phases
Same valve group promotes voltage class and power capacity.
Further, according to practical operation situation, in valve group failure, regular maintenance etc. in special circumstances, high pressure valve group
Or low pressure valve group can be by putting into or exiting operation so that the valve group cascade operating structure based on mixed type MMC can spirit
Ground switchover operation between single valve group pattern and bivalve group pattern living；Under single valve group pattern, the valve group cascade based on mixed type MMC
Only have high pressure valve group or low pressure valve group to put into operation in operating structure；Under bivalve group pattern, the valve group based on mixed type MMC
Cascade operating structure mesohigh valve group and low pressure valve group put into operation.
Preferably, in order to improve the operability of engineering construction, according to practical operation situation, in valve group failure, customary inspection
It repaiies etc. in special circumstances, high pressure valve group is by putting into and exiting operation so that the valve group cascade operating structure based on mixed type MMC
It can the neatly switchover operation between single valve group pattern and bivalve group pattern.
In general, by the contemplated above technical scheme of the utility model, following advantageous effect can be obtained：
(1) it by the way that two mixed type MMC are cascaded, under the application scenario of high-voltage large-capacity, can effectively reduce single
The quantity for the submodule that every bridge arm is connected in mixed type MMC；
(2) under fixed DC bus-bar voltage, in the valve group cascade operating structure based on mixed type MMC, single valve group
Positive and negative anodes between the DC voltage that bears it is relatively low, therefore excessive electric current, voltage stress will not be caused to switching device；It is single
When valve group voltage class is constant, the cascade structure of high-low pressure valve group can effectively promote voltage class and power capacity, Jin Ertuo
Open up the range of operation of mixed type MMC；
(3) high pressure valve group and low pressure valve group use identical a set of control system, receive identical signal instruction, can
Effectively to avoid increasing the complexity of control system；
(4) can neatly be switched between single valve group pattern and bivalve group pattern according to actual conditions, in special circumstances
Under, when single valve group is out of service, entire current conversion station remains to maintain certain power transmission, so as to improve the reliability of power supply.
Description of the drawings
Fig. 1 is the topological structure schematic diagram of existing mixed type MMC and its submodule；(a) it is the topology knot of mixed type MMC
Structure schematic diagram, (b) are the topological structure schematic diagram of bridge-type submodule, and (c) is the topological structure schematic diagram of semi-bridge type submodule；
Fig. 2 is the cascade operating structure schematic diagram of the valve group based on mixed type MMC of the utility model；
Fig. 3 is existing mixed type MMC AC/DC decouplings control method block diagram；
Fig. 4 is the valve group voltage-stabilizing controller schematic diagram of the utility model；
In all the appended drawings, identical reference numeral is used for representing identical element or structure, wherein：
101 be high pressure valve group, 103 be low pressure valve group, 105 for exchange common bus, 201 be signed magnitude arithmetic(al) unit, 203
It is MMC power control units for multiplying unit, 205.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.In addition, institute in the various embodiments of the present invention described below
The technical characteristic being related to can be combined with each other as long as they do not conflict with each other.
Valve group cascade operating structure provided by the utility model based on mixed type MMC, as shown in Fig. 2, including：It is cascade
High pressure valve group 101 and low pressure valve group 103；High pressure valve group 101 includes：Mixed type module multilevel converter MMC1；Low pressure valve
Group 103 includes：Mixed type module multilevel converter MMC2；High pressure valve group 101 is in parallel with the exchange side of low pressure valve group 103,
DC side is connected；In DC side, the voltage-to-ground grade of high pressure valve group 101 is higher than the voltage-to-ground grade of low pressure valve group 103.
In exchange side, the three-phase alternating current outlet of high pressure valve group 101 includes：A1 phases, b1 phases and c1 phases, low pressure valve group 103
Three-phase alternating current outlet includes：A2 phases, b2 phases and c2 phases；A1 phases are connected with exchanging a phases of common bus 105, and b1 phases are with exchanging
The b phases of common bus 105 are connected, and c1 phases are connected with exchanging the c phases of common bus 105；A2 phases are with exchanging common bus 105
A phases be connected, b2 phases are connected with exchanging the b phases of common bus 105, and c2 phases are connected with exchanging the c phases of common bus 105
It connects；
In DC side, the direct-flow positive pole of high pressure valve group 101 is connected with positive electrode bus, the direct current cathode of high pressure valve group 101
It is connected with the direct-flow positive pole of low pressure valve group 103；The direct-flow positive pole of low pressure valve group 103 and the direct current cathode phase of high pressure valve group 101
Connection, the direct current cathode of low pressure valve group 103 are connected with negative electrode bus.
High pressure valve group 101 uses duplicate circuit topology and control strategy with 103 inside of low pressure valve group.
High pressure valve group 101 and low pressure valve group 103 use identical a set of controller system, receive identical control
System instruction, so as to reduce the complexity of control system.
High pressure valve group 101 and low pressure valve group 103 are controlled using AC/DC decoupling, control alternating current and direct current respectively
Stream so that the independence bigger controlled between high pressure valve group 101 and low pressure valve group 103 reduces the degree of coupling between two valve groups.
In the present embodiment, AC/DC decoupling control method, as shown in figure 3, including：Exchange control ring, DC control ring
With loop current suppression ring；Exchange the dq components controlling unit difference receiving submodule capacitance voltage command value and reactive power of control ring
Instruction after measuring value of feedback relatively, is output to the control signal of MMC exchange side, to adjust exchange side voltage and current, so as to
Change bridge arm submodule capacitor voltage and the reactive power of MMC outputs；DC control ring receives active power instruction, with measurement
Active power feedback value relatively after, the control signals of MMC DC sides is output to, to adjust DC voltage and electric current, so as to change
Become the active power of MMC transmission；The command value of loop current suppression ring is 0, with the bridge arm circulation value of feedback of measurement relatively after, be output to
Control signal inside MMC, to realize the inhibition to MMC inside circulation；The control Signal averaging of three control rings forms MMC bridges
The Trig control signal of arm, while meet the control instruction inside exchange side, DC side and MMC.
Valve group voltage-stabilizing controller is additionally provided between high pressure valve group 101 and low pressure valve group 103 so that high pressure valve group 101
It is identical with the DC voltage of low pressure valve group 103, and power transmission equilibrium between two valve groups is shared, so as to ensure each valve
The safety and stabilization of group.
Valve group voltage-stabilizing controller includes：Signed magnitude arithmetic(al) unit 201, multiplying unit 203 and MMC power controls
Unit 205；
The first input end of signed magnitude arithmetic(al) unit 201 is used to receive the DC voltage U of high pressure valve group 101dcpu1, addition and subtraction
Second input terminal of arithmetic element 201 is used to receive the DC voltage U of low pressure valve group 103dcpu2, signed magnitude arithmetic(al) unit 201 uses
In by the DC voltage U of high pressure valve group 101dcpu1With the DC voltage U of low pressure valve group 103dcpu2The first operation knot is obtained after subtracting each other
Fruit；
The first input end of multiplying unit 203 is connected to the output terminal of signed magnitude arithmetic(al) unit 201, multiplying list
Second input terminal of member 203 is used to receive external given Proportional coefficient KP, multiplying unit 203 is used for the first operation knot
Fruit and the Proportional coefficient KPPower compensating value P is obtained after multiplicationdc_det；
The input terminal of MMC power control units 205 is connected to the output terminal of multiplying unit 203, MMC power control lists
Member 205 is used for according to power compensating value Pdc_detObtain the trigger signal of submodule switching device.
Further, rule of thumb, Proportional coefficient KPValue range between -2~+2；Proportional coefficient KPIt is specific
Value is obtained according to emulation.
In the present embodiment, according to practical operation situation, in valve group failure, regular maintenance etc. in special circumstances, high pressure valve
Group 101 can be by putting into or exiting operation so that the structure of mixed type MMC high-low pressures valve group cascade operation can neatly exist
Switchover operation between single valve group pattern and bivalve group pattern；Under single valve group pattern, the valve group cascade operation knot based on mixed type MMC
Only have low pressure valve group 103 to put into operation in structure；Under bivalve group pattern, in the valve group cascade operating structure based on mixed type MMC
High pressure valve group 101 and low pressure valve group 103 put into operation.
As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not
To limit the utility model, any modification made within the spirit and principles of the present invention, equivalent replacement and change
Into etc., it should be included within the scope of protection of this utility model.
Claims (4)
1. a kind of valve group cascade operating structure based on mixed type MMC, which is characterized in that including：Cascade high pressure valve group and low
Pressure valve group；The high pressure valve group includes：Mixed type module multilevel converter MMC1；The low pressure valve group includes：Mixed type
Modularization multi-level converter MMC2；The high pressure valve group is in parallel with the exchange side of the low pressure valve group, DC side series connection；Straight
Side is flowed, the voltage-to-ground grade of the high pressure valve group is higher than the voltage-to-ground grade of the low pressure valve group.
2. the valve group cascade operating structure based on mixed type MMC as described in claim 1, which is characterized in that in exchange side, institute
The three-phase alternating current outlet for stating high pressure valve group includes：A1 phases, b1 phases and c1 phases, the three-phase alternating current outlet of the low pressure valve group include：
A2 phases, b2 phases and c2 phases；A1 phases are connected with exchanging a phases of common bus, and b1 phases are connected with exchanging the b phases of common bus,
C1 phases are connected with exchanging the c phases of common bus；A2 phases are connected with exchanging a phases of common bus, and b2 phases are with exchanging public mother
The b phases of line are connected, and c2 phases are connected with exchanging the c phases of common bus；
In DC side, the direct-flow positive pole of the high pressure valve group is connected with positive electrode bus, the direct current cathode of the high pressure valve group with
The direct-flow positive pole of the low pressure valve group is connected；The direct-flow positive pole of the low pressure valve group and the direct current cathode phase of the high pressure valve group
Connection, the direct current cathode of the low pressure valve group are connected with negative electrode bus.
3. the valve group cascade operating structure based on mixed type MMC as described in claim 1, which is characterized in that in the high pressure
Valve group voltage-stabilizing controller is additionally provided between valve group and the low pressure valve group, for causing the high pressure valve group and the low pressure
The DC voltage of valve group is identical, and power transmission equilibrium between two valve groups is shared, so as to ensure the safety of each valve group
And stabilization.
4. the valve group cascade operating structure based on mixed type MMC as claimed in claim 3, which is characterized in that the valve group is equal
Pressure control device includes：Signed magnitude arithmetic(al) unit (201), multiplying unit (203) and MMC power control units (205)；
The first input end of the signed magnitude arithmetic(al) unit (201) is used to receive the DC voltage U of high pressure valve groupdcpu1, it is described to add
Second input terminal of subtraction unit (201) is used to receive the DC voltage U of low pressure valve groupdcpu2, the signed magnitude arithmetic(al) list
First (201) are for by the DC voltage U of the high pressure valve groupdcpu1With the DC voltage U of the low pressure valve groupdcpu2It is obtained after subtracting each other
Obtain the first operation result；
The first input end of the multiplying unit (203) is connected to the output terminal of the signed magnitude arithmetic(al) unit, described to multiply
Second input terminal of method arithmetic element (203) is used to receive external given Proportional coefficient KP, the multiplying unit (203)
For by first operation result and the Proportional coefficient KPPower compensating value is obtained after multiplication；
The input terminal of the MMC power control units (205) is connected to the output terminal of the multiplying unit, the MMC work(
Rate control unit (205) is for the trigger signal according to power compensating value acquisition submodule switching device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721597588.9U CN207490790U (en) | 2017-11-23 | 2017-11-23 | A kind of valve group cascade operating structure based on mixed type MMC |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721597588.9U CN207490790U (en) | 2017-11-23 | 2017-11-23 | A kind of valve group cascade operating structure based on mixed type MMC |
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| CN207490790U true CN207490790U (en) | 2018-06-12 |
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| CN201721597588.9U Expired - Fee Related CN207490790U (en) | 2017-11-23 | 2017-11-23 | A kind of valve group cascade operating structure based on mixed type MMC |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103983A (en) * | 2020-09-10 | 2020-12-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Control method based on mixed MMC-HVDC |
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2017
- 2017-11-23 CN CN201721597588.9U patent/CN207490790U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103983A (en) * | 2020-09-10 | 2020-12-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Control method based on mixed MMC-HVDC |
| CN112103983B (en) * | 2020-09-10 | 2022-02-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Control method based on mixed MMC-HVDC |
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Granted publication date: 20180612 |