CN107070192A - Flexible direct current power transmission system based on combination transverter is coordinated to press startup method - Google Patents
Flexible direct current power transmission system based on combination transverter is coordinated to press startup method Download PDFInfo
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- CN107070192A CN107070192A CN201710202416.5A CN201710202416A CN107070192A CN 107070192 A CN107070192 A CN 107070192A CN 201710202416 A CN201710202416 A CN 201710202416A CN 107070192 A CN107070192 A CN 107070192A
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- submodule
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Classifications
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
Coordinate to press startup method the present invention relates to the flexible direct current power transmission system based on combination transverter, wherein, combined converter is made up of N number of basic convertor unit series boosting.For a controlling cycle, the submodule excision number in each basic convertor unit bridge arm is determined, the submodule of corresponding number in each bridge arm is then cut off, the submodule of other inputs is charged.In the excision principle of submodule excision number, first principle can ensure that the submodule capacitor voltage average value of all basic convertor units in station can reach and stably near rated value.Article 2 principle can realize the submodule electric capacity charge balancing of each basic convertor unit.Moreover, it is determined that after submodule excision number in each bridge arm, the higher submodule of preferential excision charging voltage, the electric voltage equalization between each submodule in basic convertor unit can be realized, therefore, by the startup method, it can ensure that startup is pressed in the coordination between basic convertor unit.
Description
Technical field
Coordinate to press startup method the present invention relates to the flexible direct current power transmission system based on combination transverter, belong to direct current defeated
Electric system start-up technique field.
Background technology
With the fast development and the update of Power Electronic Technique of modern power network, based on modularization multi-level converter
The flexible direct current power transmission system of (Modular Multilevel Converter, MMC) technology achieves rapid progress, and progressively
Realize engineer applied.But relative to Traditional DC transmission system (also known as line commutation transverter HVDC transmission system,
Line Commutated Converter Based High Voltage Direct Current, LCC-HVDC), its voltage
Grade and transmission capacity await further lifting.
The high voltage power transmisson system topological structure of Traditional DC transmission system is used for reference, basic change of current list is used as using MMC transverters
Member, can realize the requirement of high-voltage large-capacity, namely pass through the parallel connection of basic convertor unit using the matrix form combination of transverter
Transmission capacity is improved, conveying voltage class is improved by the series connection (cascading) of basic convertor unit, combination transverter is formed, has
Effect solves this problem.
Flexible direct current power transmission system is by M combination current conversion station network consisting, as shown in figure 1, one kind to combine transverter
Topology diagram, combined converter is made up of N number of basic convertor unit series boosting, using modularization multi-level converter
(Modular Multilevel Converter, MMC) or its parallel combination are used as basic convertor unit.
However, the research currently for the flexible direct current power transmission system based on combination transverter is still in initial stage, it is special
It is not the system start method for combined converter still in space state.
Whether AC network is connected according to AC, start-up course is divided into active startup and started with passive.Active startup is pressed
Directly the access situation of flow network can be divided into active independent startup and active common startup again, wherein, active independent startup refers to
Current conversion station system does not access direct current network before activation, is that MMC submodules enter line precharge by alternating current active network；It is active common
Refer to that current conversion station system has accessed direct current network before activation with starting, be MMC submodules jointly by AC/DC network
Charging.And passive start is that the DC network set up by other stations charges to each submodules of MMC.
When for active independent startup current conversion station, the start-up course for interior each basic convertor unit of standing is relatively independent, its
Start strategy and start strategy and indistinction with tradition.And for passive startup or active common startup current conversion station, direct current net
Network can simultaneously charge to all basic convertor units in station, using traditional startup control strategy to each basic convertor unit
The mode of independent control can not meet startup optimization demand, easily trigger in current conversion station due to the parameter between basic convertor unit
And the unbalanced problem of submodule electric capacity charging caused by control otherness, while so that each basic convertor unit is straight after charging complete
Flow voltage distribution uneven.
The content of the invention
Coordinate to press startup side it is an object of the invention to provide a kind of flexible direct current power transmission system based on combination transverter
Method, easily triggers each basic convertor unit submodule voltage charging in current conversion station unbalanced to solve traditional startup control strategy
The problem of.
To achieve the above object, the solution of the present invention includes a kind of flexible direct current power transmission system association based on combination transverter
Adjust and press startup method, comprise the following steps：
(1) for a controlling cycle, the submodule excision number in each basic convertor unit bridge arm is determined；
(2) submodule of corresponding number in each bridge arm is cut off, the submodule put into each bridge arm is charged；
Determine that the submodule in each bridge arm cuts off number according to following two principles：
1) when the submodule capacitor voltage average value on k-th of basic i-th of bridge arm of convertor unit is less than rated value, and institute
The submodule of i-th of the bridge arm of basic convertor unit having always cuts off number and always cut less than all i-th of bridge arms of basic convertor unit
During divisor higher limit, gradually increase the submodule excision number in the bridge arm；
2) when the submodule capacitor voltage average value on k-th of basic i-th of bridge arm of convertor unit be less than it is all basic
The submodule capacitor voltage average value of i-th of bridge arm of convertor unit, and the submodule excision number of the bridge arm is more than a given threshold
When, it is gradually reduced the submodule excision number on the bridge arm；
Submodule to be cut off is the higher submodule of capacitance voltage in correspondence bridge arm in each controlling cycle, each bridge arm；
Wherein, k=1,2 ..., N；I=1,2 ..., 6.
When system is passive startup, the calculation formula that i-th of bridge arm always cuts off number higher limit is：
Nck_limit=Ntotal-Nrated/2
Wherein, Ntotal, Nrated are respectively the total submodule number and specified submodule number of correspondence bridge arm；
When system is active common startup, the calculation formula that i-th of bridge arm always cuts off number higher limit is：
Nck_limit=Ntotal-Nrated/2-Vabmax/Vsm_rated
Wherein, Vabmax is ac line voltage peak value, and Vsm_rated is that the submodule capacitor voltage of correspondence bridge arm is averaged
Value.
The startup method is further comprising the steps of：The equal locking of submodule of each basic convertor unit, enters to each submodule
Line precharge, when the submodule capacitor voltage of basic convertor unit is higher than the voltage threshold set, according to described two principles
Determine the submodule excision number in each bridge arm.
After each basic convertor unit Neutron module charges to specified and stable holding, operation is unlocked to transverter.
In unblock running, the basic convertor unit of constant DC voltage control is first unlocked, then solution locking wattful power
The basic convertor unit of rate control, power command value is risen by the slope of setting.
Flexible direct current power transmission system proposed by the present invention coordinates pressure startup method and is applied to combined converter, by right
The basic convertor unit of passive startup or active common startup current conversion station starts control strategy and transformed, to each basic change of current list
The submodule excision number of member carries out coordination control, to determine that the submodule on each bridge arm cuts off number, so as to efficiently solve nothing
Source starts or active common startup current conversion station is interior due to submodule caused by the parameter between basic convertor unit and control otherness
The unbalanced problem of electric capacity charging.
Also, determine that the submodule on each bridge arm cuts off number using two principle, first principle is in submodule electric capacity
Average voltage is less than rated value, and the submodule of all basic convertor unit correspondence bridge arms always cuts off number less than total excision number
During higher limit, gradually increase the submodule excision number in the bridge arm, it is ensured that the submodule of all basic convertor units in standing
Capacitance voltage average value can reach and stably near rated value.In Article 2 principle, if the submodule of certain basic convertor unit
Block average voltage is smaller and the basic convertor unit current sub-block excision number is higher than setting value, then reduces the son of correspondence bridge arm
Module cuts off number, that is, the submodule number increased input makes more submodules participate in charging, to raise submodule average voltage
Value, realizes the submodule electric capacity charge balancing of each basic convertor unit.Moreover, it is determined that the submodule in each bridge arm cuts off number
When, the higher submodule of preferential excision charging voltage can realize the electric voltage equalization between submodule.Also, for each control
In the cycle, the excision number of each bridge arm is determined according to above-mentioned two principle, the submodule of input is charged, can finally made each
The submodule of basic convertor unit charges to rated value and keeps stable.
Therefore, by the startup method, the combination basic change of current list of inverter inside in start-up course can not only be ensured
Startup is pressed in coordination between member, and can realize that the submodule of each basic convertor unit is charged near rated value, and then is kept away
Exempt from electrical impact during basic convertor unit unblock operation.
Brief description of the drawings
Fig. 1 is the flexible direct current power transmission system topological structure schematic diagram based on combination transverter；
Fig. 2 is that the flexible direct current power transmission system based on combination transverter starts strategic process schematic diagram.
Embodiment
The flexible direct current power transmission system based on combination transverter that the present invention is provided coordinates pressure startup method and is applied to nothing
System or the active system started jointly that source starts, the present embodiment is by taking passive startup as an example, and Fig. 1 is to be a kind of to passive system
The combination transverter flexible direct current power transmission system of power supply, is composed in series by N number of basic convertor unit, is that passive system is powered.Its
In, in the present embodiment, basic convertor unit is a single MMC.
Flexible direct current power transmission system based on combination transverter coordinates pressure startup method and generally comprises three steps：A、
Pre-charging stage, B, it is controllable press the charging stage, C, unblock the operation phase.
Wherein, pre-charging stage refers to, the equal locking of submodule of the stage each basic convertor unit, passes through DC network pair
Each submodule enters line precharge.
In step A pre-charging stages, line precharge is entered by DC side direct voltage source simultaneously to basic convertor unit,
This stage submodule voltage perunit value reaches as high as Vdc/2/Ntotal/Vsm_rated<0.5pu.In formula, Vdc, Vsm_
Rated is respectively basic convertor unit DC voltage and submodule rated voltage, and Ntotal is the total submodule number of bridge arm.
The charging capacitor voltage of each submodule is gradually increasing, when basic convertor unit submodule voltage is higher than electricity on control panel
After voltage Vth (being typically taken as 0.3pu), charging stage B is pressed into controllable, in the stage, each bridge is determined with certain principle
The submodule excision number of arm, then cuts off the corresponding submodule in each bridge arm.The stage refers to that submodule magnitude of voltage has reached son
The normal working voltage of module control panel power supply, control panel can be with normal work.
Step B it is controllable pressure the charging stage in, made by way of cut-out submodule in turn submodule voltage after
Continuous charging.The determination principle of submodule excision number has the following submodule average voltage, mentioned in herein below, submodule at 2 points
Block excision number is for single bridge arm.Also, it is bridge arm in a phases, a phases respectively because MMC transverters include 6 bridge arms
Bridge arm under bridge arm, b phases on lower bridge arm, b phases, bridge arm under bridge arm and c phases in c phases, when determination sub-module cuts off number, it is necessary to this
6 bridge arms carry out removal procedure according to excision principle, then, the submodule of the bridge arm is cut by taking bridge arm in a phases as an example below
Divisor is illustrated, other 5 bridge arms with this similarly.
First, when the submodule capacitor voltage average value of bridge arm in the individual basic convertor unit a phases of kth (k=1,2 ..., N)
Vsm_avk is less than specified submodule capacitor voltage value Vsm_rated (can leave certain allowance, take 1.05Vsm_rated), and
The submodule of bridge arm always cuts off number in a phases of all basic convertor units of series connection in standingIt is basic less than all series connection
Total excision number upper limit of the submodule of bridge arm in a phases of convertor unitWhen, gradually increase the basic convertor unit a phases
The excision number of upper bridge arm.
Second, when the submodule capacitor voltage average value Vsm_avk of bridge arm in k-th of basic convertor unit a phase is less than station
The average value Vsm_av of the submodule capacitor voltage of bridge arm (can suitably reduce, take in interior all basic convertor unit a phases of series connection
0.98Vsm_av, to reduce the frequent variation of excision number), and the submodule of bridge arm cuts off number Nck in the basic convertor unit a phases
During more than a given threshold Nref, the submodule excision number of the basic convertor unit is gradually reduced.In the present embodiment, given threshold
Nref is the half that bridge arm submodule cuts off the number upper limit in single basic convertor unit a phases, i.e. Nck_limit/2.
For some controlling cycle, principle is cut off according to above-mentioned two and determines that the submodule of each bridge arm cuts off number, then
The submodule put into each bridge arm is charged；When next cycle comes, principle is cut off also according to above-mentioned two true again
The submodule excision number of fixed each bridge arm, then charges to the submodule put into each bridge arm.That is, for each control
In the cycle processed, cut off principle all in accordance with above-mentioned two and determine that the submodule of each bridge arm cuts off number, then the son to being put into each bridge arm
Module is charged.So, by each controlling cycle, the submodule excision number of each bridge arm can be modified, until each
The submodule of each bridge arm input charges to rated value in basic convertor unit, and keeps stabilization (to remain rated value, Huo Zhewen
It is scheduled in an interval comprising rated value, further in centered on rated value a interval, preferably one very little
Interval), into unblock the operation phase.
Moreover, it is contemplated that to the pressure situation of each submodule in the same bridge arm of basic convertor unit, each controlling cycle is being cut
, it is necessary to which excision is the higher submodule of capacitance voltage in bridge arm during except bridge arm submodule, that is to say, that it is determined that current submodule
Before block excision number, the capacitance voltage of bridge arm submodule is sorted successively from high to low, when being cut off, capacitance voltage is cut off
Higher submodule, such as：If there is M submodule in bridge arm, in a controlling cycle, capacitance voltage is from high to low successively
For：U1、U2、U3、……、UM-1、UM, then, if bridge arm needs to cut off 4 submodules, the submodule of excision in the controlling cycle
Block is exactly U1、U2、U3And U4Corresponding submodule.If moreover, the excision number of next controlling cycle bridge arm and this controlling cycle
When the 4 excision numbers needed are inconsistent, increase excision number is 1. needed, excision priority is U5＞ U6＞ U7... ＞ UM-1＞ UM,
For example：If necessary to cut off again if 2 submodules can meet above-mentioned requirements, the submodule of excision is exactly U5And U6Correspondence
Submodule；2. need to reduce excision number, input priority is U4＞ U3＞ U2＞ U1, then, if necessary to reduce 2 excisions
If number can meet above-mentioned requirements, then, the submodule of input is exactly U4And U3Corresponding submodule.In a word, in excision
During module, what is finally cut off is the higher submodule of voltage in bridge arm：When increase excision number, chosen from the submodule of input
The submodule that voltage is higher is selected, is added it in submodule to be cut off；When reducing excision number, from the submodule of excision
The relatively low submodule of voltage is selected, is added it in submodule to be put into.
Because system is passive startup, then, the calculating of total excision number higher limit of bridge arm is public in basic convertor unit a phases
Formula is：
Nck_limit=Ntotal-Nrated/2
Wherein, Ntotal, Nrated are respectively total submodule number of bridge arm and specified submodule in the basic convertor unit a phases
Block number.
Certainly, if system is active common startup, then, in the basic convertor unit a phases on total excision number of bridge arm
The calculation formula of limit value is：
Nck_limit=Ntotal-Nrated/2-Vabmax/Vsm_rated
Wherein, Vabmax is ac line voltage peak value.
When it is determined that the submodule of each bridge arm cuts off number, the submodule that can first set each bridge arm cuts off number as 0, then presses
Principle is cut off according to above-mentioned two and cuts off number gradually to adjust the submodule of each bridge arm, is required until meeting, as shown in Figure 2.Certainly,
Each bridge arm can also first set certain submodule excision number, i.e., first set the initial submodule excision number x (x ≠ 0) of each bridge arm,
The initial submodule excision number x of each bridge arm is the higher submodule of voltage in correspondence bridge arm, then cuts off former according to above-mentioned two
Then carry out gradually to adjust the submodule excision number of each bridge arm, required until meeting.
The submodule excision number upper limit Nck_limit of each basic convertor unit can choose according to stable state charging voltage, for example：
Single basic convertor unit rated direct voltage Vdc is 1000kV, and submodule stable state charging voltage Vsm_rated is 2.5kV, if
Want to make submodule be charged to rated value, be then 1000kV/2.5kV=400 (individual) per the submodule number mutually at most put into, in every phase
The submodule higher limit that lower bridge arm can be put into is identical, is 200, then the submodule excision number upper limit of each bridge arm can be taken as Nck_
Limit=Ntotal-10=432-200=232 (individual).
So, it can finally determine that each bridge arm submodule in each basic convertor unit is cut off by above-mentioned excision principle
Number, that is, can determine that the submodule input number of each bridge arm.
In the step C unblock operation phase, control can be unlocked according to following control strategy：Constant DC voltage control
Basic convertor unit can unlock first, the basic convertor unit of rear solution locking active power controller, power instruction is by certain
Slope rises, and can reduce the rush of current in whole releasing process.
Therefore, above-mentioned first principle can ensure the submodule capacitor voltage average value of all basic convertor units in station
Vsm_av is reached near rated value；Second principle, by comparing basic convertor unit and all basic change of current lists of connecting in real time
The submodule average voltage of member, if the submodule average voltage of certain basic convertor unit is smaller and the basic convertor unit is worked as
Preceding submodule excision number is higher than setting value, then can reduce excision number, that is, the submodule number increased input makes more submodules
Charging is participated in, to raise submodule average voltage, and then realizes that each basic convertor unit Coordination Equilibrium starts.
So, startup method is pressed by the coordination, the combination inverter inside base in start-up course can not only be ensured
Startup is pressed in coordination between this convertor unit, and can realize the submodule of each basic convertor unit to charge to rated value attached
Closely, and then electrical impact when avoiding the unblock operation of basic convertor unit.
The basic ideas of the present invention are that the submodule in the controllable pressure charging stage cuts off strategy, to realize that voltage is equal
Weighing apparatus, and then belong to specific implementation means for the technical characteristic of pre-charging stage and unblock operation phase, the present invention does not limit to
Embodiment described in above-described embodiment.
Claims (5)
1. it is a kind of based on combination transverter flexible direct current power transmission system coordinate press startup method, it is characterised in that including with
Lower step：
(1) for a controlling cycle, the submodule excision number in each basic convertor unit bridge arm is determined；
(2) submodule of corresponding number in each bridge arm is cut off, the submodule put into each bridge arm is charged；
Determine that the submodule in each bridge arm cuts off number according to following two principles：
1) it is and all when the submodule capacitor voltage average value on k-th of basic i-th of bridge arm of convertor unit is less than rated value
The submodule of i-th of bridge arm of basic convertor unit always cuts off number and always cuts off number less than all i-th of bridge arms of basic convertor unit
During higher limit, gradually increase the submodule excision number in the bridge arm；
2) when the submodule capacitor voltage average value on k-th of basic i-th of bridge arm of convertor unit is less than all basic changes of current
The submodule capacitor voltage average value of i-th of bridge arm of unit, and the bridge arm submodule excision number be more than a given threshold when, by
Submodule excision number on the decrescence small bridge arm；
Submodule to be cut off is the higher submodule of capacitance voltage in correspondence bridge arm in each controlling cycle, each bridge arm；
Wherein, k=1,2 ..., N；I=1,2 ..., 6.
2. the flexible direct current power transmission system according to claim 1 based on combination transverter is coordinated to press startup method, its
It is characterised by, when system is passive startup, the calculation formula that i-th of bridge arm always cuts off number higher limit is：
Nck_limit=Ntotal-Nrated/2
Wherein, Ntotal, Nrated are respectively the total submodule number and specified submodule number of correspondence bridge arm；
When system is active common startup, the calculation formula that i-th of bridge arm always cuts off number higher limit is：
Nck_limit=Ntotal-Nrated/2-Vabmax/Vsm_rated
Wherein, Vabmax is ac line voltage peak value, and Vsm_rated is the submodule capacitor voltage average value of correspondence bridge arm.
3. the flexible direct current power transmission system according to claim 1 or 2 based on combination transverter is coordinated to press startup method,
Characterized in that, the startup method is further comprising the steps of：The equal locking of submodule of each basic convertor unit, to each submodule
Enter line precharge, when the submodule capacitor voltage of basic convertor unit is higher than the voltage threshold set, according to described two originals
Then determine the submodule excision number in each bridge arm.
4. the flexible direct current power transmission system according to claim 1 or 2 based on combination transverter is coordinated to press startup method,
Characterized in that, after each basic convertor unit Neutron module charges to specified and stable holding, fortune is unlocked to transverter
OK.
5. the flexible direct current power transmission system according to claim 4 based on combination transverter is coordinated to press startup method, its
It is characterised by, in unblock running, first unlocks the basic convertor unit of constant DC voltage control, then solution locking wattful power
The basic convertor unit of rate control, power command value is risen by the slope of setting.
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| CN108054944A (en) * | 2018-01-25 | 2018-05-18 | 湖南大学 | A kind of 50 electric harmonic generator control methods |
| CN108054944B (en) * | 2018-01-25 | 2019-05-07 | 湖南大学 | A kind of 50 electric harmonic generator control methods |
| CN108448885A (en) * | 2018-03-29 | 2018-08-24 | 西安许继电力电子技术有限公司 | A kind of closed loop charging method of modularization multi-level converter |
| CN108448885B (en) * | 2018-03-29 | 2020-04-21 | 西安许继电力电子技术有限公司 | Closed-loop charging method of modular multilevel converter |
| CN108683204A (en) * | 2018-04-08 | 2018-10-19 | 许继集团有限公司 | Charging method when the hybrid Converter DC-side short circuit of one seed module |
| CN109861266A (en) * | 2019-01-15 | 2019-06-07 | 南京工程学院 | The flexible starting method of the flexible HVDC transmission system of the access containing extensive new energy |
| CN109861266B (en) * | 2019-01-15 | 2023-02-10 | 南京工程学院 | Flexible starting method of flexible direct current transmission system with large-scale new energy access |
| CN111934340A (en) * | 2020-08-24 | 2020-11-13 | 华中科技大学 | Adaptive power-voltage droop control method and system for direct current transmission system |
| CN111934340B (en) * | 2020-08-24 | 2021-11-19 | 华中科技大学 | Adaptive power-voltage droop control method and system for direct current transmission system |
| CN116667345A (en) * | 2023-07-31 | 2023-08-29 | 广东电网有限责任公司佛山供电局 | Charging control method and device for serial-parallel type multi-port flexible interconnection equipment |
| CN116667345B (en) * | 2023-07-31 | 2024-03-19 | 广东电网有限责任公司佛山供电局 | Charging control method and device for serial-parallel type multi-port flexible interconnection equipment |
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