CN107070192B - Flexible HVDC transmission system based on combination inverter is coordinated to press starting method - Google Patents
Flexible HVDC transmission system based on combination inverter is coordinated to press starting method Download PDFInfo
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- CN107070192B CN107070192B CN201710202416.5A CN201710202416A CN107070192B CN 107070192 B CN107070192 B CN 107070192B CN 201710202416 A CN201710202416 A CN 201710202416A CN 107070192 B CN107070192 B CN 107070192B
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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
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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
- H02M1/0067—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]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
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Abstract
The present invention relates to the flexible HVDC transmission systems based on combination inverter to coordinate to press starting method, wherein combined converter is made of N number of basic convertor unit series boosting.For a control period, determines the submodule excision number in each basic convertor unit bridge arm, then cut off the submodule of corresponding number in each bridge arm, charge to the submodule of other investments.Submodule is cut off in the excision principle of number, and first principle can guarantee that the submodule capacitor voltage average value of all basic convertor units in station can reach and stablize near rated value.The submodule capacitor charging that Article 2 principle can be realized each basic convertor unit is balanced.Moreover, after determining the submodule excision number in each bridge arm, it is preferential to cut off the higher submodule of charging voltage, it can be realized the electric voltage equalization in basic convertor unit between each submodule, therefore, by the starting method, it can ensure that starting is pressed in the coordination between basic convertor unit.
Description
Technical field
The present invention relates to the flexible HVDC transmission systems based on combination inverter to coordinate to press starting method, and it is defeated to belong to direct current
Electric system start-up technique field.
Background technique
With the fast development of modern power network and the update of power electronic technique, it is based on modularization multi-level converter
The flexible HVDC transmission system of (Modular Multilevel Converter, MMC) technology achieves rapid progress, and gradually
Realize engineer application.But relative to Traditional DC transmission system (also known as line commutation inverter HVDC transmission system,
Line Commutated Converter Based High Voltage Direct Current, LCC-HVDC), voltage
Grade and transmission capacity are up for further being promoted.
The high voltage power transmisson system topological structure for using for reference Traditional DC transmission system, using MMC inverter as basic change of current list
The requirement of high-voltage large-capacity, namely the parallel connection by basic convertor unit may be implemented using the matrix form combination of inverter for member
Transmission capacity is improved, conveying voltage class is improved by the series connection (cascading) of basic convertor unit, combination inverter is formed, has
Effect solves this problem.
Flexible HVDC transmission system is by M combination converter station network consisting, as shown in Figure 1, for one kind of combination inverter
Topology diagram, combined converter is made of N number of basic convertor unit series boosting, using modularization multi-level converter
(Modular Multilevel Converter, MMC) or its parallel combination are as basic convertor unit.
However, the research for the flexible HVDC transmission system based on combination inverter is still in initial stage at present, it is special
It is not the system start method for combined converter still in space state.
AC network whether is connected according to exchange side, start-up course is divided into active starting and passive starting.Active starting is pressed
Directly the access situation of flow network can be divided into active independent startup and active common starting again, wherein active independent startup refers to
Converter station system does not access DC grid before activation, is that MMC submodule is pre-charged by alternating current active network；It is active total
Refer to that converter station system has accessed DC grid before activation with starting, is jointly MMC submodule by AC/DC network
Charging.And passive starting is that the DC network established by other stations charges to each submodule of MMC.
When for active independent startup converter station, the start-up course for interior each basic convertor unit of standing is relatively independent,
Starting strategy and tradition starting strategy and indistinction.And for passive starting or active common starting converter station, direct current net
Network can charge simultaneously to all basic convertor units in standing, using traditional starting control strategy to each basic convertor unit
The mode of independent control has been unable to meet starting operation demand, easily due to the parameter between basic convertor unit in initiation converter station
And the unbalanced problem of submodule capacitor charging caused by control otherness, while making each basic convertor unit after charging complete straight
Galvanic electricity pressure distribution is uneven.
Summary of the invention
The object of the present invention is to provide a kind of flexible HVDC transmission systems based on combination inverter to coordinate to press starting side
Method, to solve traditional starting control strategy, easily to cause each basic convertor unit submodule voltage charging in converter station unbalanced
The problem of.
To achieve the above object, the solution of the present invention includes a kind of flexible HVDC transmission system association based on combination inverter
It adjusts and presses starting method, comprising the following steps:
(1) for a control period, the submodule excision number in each basic convertor unit bridge arm is determined；
(2) submodule for cutting off corresponding number in each bridge arm, charges to the submodule put into each bridge arm；
Determine that the submodule in each bridge arm cuts off number according to following two principle:
1) when the submodule capacitor voltage average value on k-th of basic convertor unit, i-th of bridge arm 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 cuts less than all i-th of bridge arms of basic convertor unit
When divisor upper limit value, the submodule excision number in the bridge arm is gradually increased；
2) when the submodule capacitor voltage average value on k-th of basic convertor unit, i-th of bridge arm 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 greater than a given threshold
When, the submodule being gradually reduced on the bridge arm cuts off number；
In each control period, submodule to be cut off is the higher submodule of capacitance voltage in corresponding bridge arm in each bridge arm；
Wherein, k=1,2 ..., N；I=1,2 ..., 6.
When system is passive starting, i-th of bridge arm always cuts off the calculation formula of number upper limit value are as follows:
Nck_limit=Ntotal-Nrated/2
Wherein, Ntotal, Nrated are respectively the total submodule number and specified submodule number of corresponding bridge arm；
When system is active common starting, i-th of bridge arm always cuts off the calculation formula of number upper limit value are as follows:
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 corresponding bridge arm is average
Value.
The starting method is further comprising the steps of: the submodule of each basic convertor unit is latched, to each submodule into
Line precharge, when the submodule capacitor voltage of basic convertor unit is higher than the voltage threshold of setting, according to described two principles
Determine the submodule excision number in each bridge arm.
After each basic convertor unit Neutron module, which charges to specified and holding, to be stablized, operation is unlocked to inverter.
In unlock operational process, 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 are risen by the slope of setting.
Flexible HVDC transmission system proposed by the present invention coordinates pressure starting method and is suitable for combined converter, by right
The basic convertor unit of passive starting or active common starting converter station starting control strategy is transformed, to each basic change of current list
The submodule excision number of member carries out coordinated control, number is cut off with the submodule on each bridge arm of determination, to efficiently solve nothing
The submodule as caused by the parameter and control otherness between basic convertor unit in source starting or active common starting converter station
The unbalanced problem of capacitor charging.
Also, determine that the submodule on each bridge arm cuts off number using two principle, first principle is in submodule capacitor
Average voltage be less than rated value, and all basic convertor units correspond to bridge arm submodule always cut off number be less than always cut off number
When upper limit value, the submodule excision number in the bridge arm is gradually increased, it is ensured that the submodule of all basic convertor units in standing
Capacitance voltage average value can reach and stablize 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 corresponding 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 that the submodule capacitor charging of each basic convertor unit is balanced.Moreover, determining the submodule excision number in each bridge arm
When, it is preferential to cut off the higher submodule of charging voltage, it can be realized the electric voltage equalization between submodule.Also, for each control
In the period, the excision number of each bridge arm is determined according to above-mentioned two principle, is charged to the submodule of investment, can finally make each
The submodule of basic convertor unit charges to rated value and keeps stable.
Therefore, by the starting method, the combination basic change of current list of inverter inside during startup can not only be ensured
Starting is pressed in coordination between member, and the submodule that can be realized each basic convertor unit charges near rated value, and then keeps away
Exempt from electrical impact when basic convertor unit unlock operation.
Detailed description of the invention
Fig. 1 is the flexible HVDC transmission system topological structure schematic diagram based on combination inverter；
Fig. 2 is that the flexible HVDC transmission system based on combination inverter starts strategic process schematic diagram.
Specific embodiment
Flexible HVDC transmission system provided by the invention based on combination inverter coordinates pressure starting method and is applied to nothing
The system or the active system started jointly of source starting, for the present embodiment by taking passive starting as an example, Fig. 1 is a kind of to passive system
The combination inverter flexible HVDC transmission system of power supply, is composed in series by N number of basic convertor unit, is powered for passive system.Its
In, in the present embodiment, basic convertor unit is an individual MMC.
Flexible HVDC transmission system based on combination inverter coordinates pressure starting method and generally comprises three steps: A,
Pre-charging stage, B, controllable pressure charging stage, C, unlock operation phase.
Wherein, pre-charging stage refers to, the stage submodule of each basic convertor unit is latched, and passes through DC network pair
Each submodule is pre-charged.
In step A pre-charging stage, basic convertor unit is pre-charged simultaneously by DC side DC voltage source,
This stage submodule voltage per unit 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 voltage rating, 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 powered on higher than control panel
After voltage Vth (being generally taken as 0.3pu), into charging stage B is controllably pressed, in the stage, each bridge is determined with certain principle
The submodule of arm cuts off number, then cuts off the corresponding submodule in each bridge arm.The stage refers to that submodule voltage value has reached son
The normal working voltage of module control panel power supply, control panel can work normally.
Step B controllably press 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 following two points, the submodule average voltage mentioned in the following contents, submodule
Block excision number is for single bridge arm.It also, is bridge arm in a phase, a phase respectively since MMC inverter includes 6 bridge arms
Bridge arm in lower bridge arm, b phase, b phase lower bridge arm, bridge arm and c phase lower bridge arm are needed when determining that submodule cuts off number to this in c phase
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 phase as an example below
Divisor is illustrated, other 5 bridge arms are in the same way.
First, when the submodule capacitor voltage average value of bridge arm in a basic convertor unit a phase of kth (k=1,2 ..., N)
Vsm_avk is less than specified submodule capacitor voltage value Vsm_rated (can take 1.05Vsm_rated there are certain allowance), and
The submodule of bridge arm always cuts off number in a phase 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 phase of convertor unitWhen, gradually increase the basic convertor unit a
The excision number of bridge arm in phase.
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 phase
When greater than a given threshold Nref, it is gradually reduced the submodule excision number of the basic convertor unit.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 phase, i.e. Nck_limit/2.
Period is controlled for some, determines that the submodule of each bridge arm cuts off number according to above-mentioned two excision principle, then
It charges to the submodule put into each bridge arm；It is true again also according to above-mentioned two excision principle when next cycle comes
The submodule of fixed each bridge arm cuts off number, then charges to the submodule put into each bridge arm.That is, for each control
Period processed determines that the submodule of each bridge arm cuts off number all in accordance with above-mentioned two excision principle, then to the son put into each bridge arm
Module charges.So can cut off number by each control period to the submodule of each bridge arm and be modified, until each
The submodule of each bridge arm investment charges to rated value in basic convertor unit, and stabilization is kept (to remain rated value, Huo Zhewen
It is scheduled in the section comprising rated value, further in a section centered on rated value, a preferably very little
Section), into unlock the operation phase.
Moreover, it is contemplated that in each control period, being cut to the pressure situation of each submodule in the same bridge arm of basic convertor unit
When except bridge arm submodule, need to cut off is the higher submodule of capacitance voltage in bridge arm, that is to say, that in the current submodule of determination
Before block cuts off number, the capacitance voltage of bridge arm submodule is successively sorted from high to low, when being cut off, cuts off capacitance voltage
Higher submodule, such as: if there is M submodule in bridge arm, a control period, capacitance voltage is from high to low successively
Are as follows: U1、U2、U3、……、UM-1、UM, then, if bridge arm needs to cut off 4 submodules, the submodule of excision in the control period
Block is exactly U1、U2、U3And U4Corresponding submodule.Moreover, if excision number and this control period of next control period bridge arm
When the 4 excision numbers needed are inconsistent, 1. need to increase excision number, excision priority is U5> U6> U7... > UM-1> UM,
Such as: if necessary to be cut off if 2 submodules can meet above-mentioned requirements again, the submodule of excision is exactly U5And U6It is corresponding
Submodule；2. needing to reduce excision number, investment priority is U4> U3> U2> U1, then, if necessary to reduce 2 excisions
If number can meet above-mentioned requirements, then, the submodule of investment is exactly U4And U3Corresponding submodule.In short, in excision
When module, what is finally cut off is the higher submodule of voltage in bridge arm: when increasing excision number, being chosen from the submodule of investment
The higher submodule of voltage is selected, is added it in submodule to be cut off；When reducing excision number, from the submodule of excision
The lower submodule of voltage is selected, is added it in submodule to be put into.
Since system is passive starting, then, the calculating of total excision number upper limit value of bridge arm is public in basic convertor unit a phase
Formula are as follows:
Nck_limit=Ntotal-Nrated/2
Wherein, Ntotal, Nrated are respectively the total submodule number Yu specified submodule of bridge arm in the basic convertor unit a phase
Block number.
Certainly, if system is active common starting, in the basic convertor unit a phase on total excision number of bridge arm
The calculation formula of limit value are as follows:
Nck_limit=Ntotal-Nrated/2-Vabmax/Vsm_rated
Wherein, Vabmax is ac line voltage peak value.
When the submodule for determining each bridge arm cuts off number, the submodule that can first set each bridge arm cuts off number as 0, then presses
The submodule that each bridge arm is gradually adjusted according to above-mentioned two excision principle cuts off number, until meeting the requirements, as shown in Figure 2.Certainly,
Each bridge arm can also first set certain submodule excision number, i.e., first set 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 corresponding bridge arm, then former according to above-mentioned two excision
Number then is cut off gradually to adjust the submodule of each bridge arm, until meeting the requirements.
The submodule excision number upper limit Nck_limit of each basic convertor unit can choose according to stable state charging voltage, such as:
Single basic convertor unit rated direct voltage Vdc is 1000kV, and submodule stable state charging voltage Vsm_rated is 2.5kV, if
Want that submodule is made to be charged to rated value, then the submodule number that every phase is at most put into is 1000kV/2.5kV=400 (a), in every phase
The submodule upper limit value 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 (a).
So can finally determine that each bridge arm submodule in each basic convertor unit is cut off by above-mentioned excision principle
Number can determine that the submodule investment number of each bridge arm.
In the step C unlock operation phase, control: constant DC voltage control can be unlocked according to following control strategy
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 entire unlocking process.
Therefore, above-mentioned first principle can guarantee the submodule capacitor voltage average value of all basic convertor units in station
Vsm_av reaches near rated value；Second principle passes through more basic convertor unit in real time and all basic change of current lists of connecting
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 each basic convertor unit Coordination Equilibrium starting.
So pressing starting method by the coordination, combination inverter inside base during startup can not only be ensured
Starting is pressed in coordination between this convertor unit, and to charge to rated value attached for the submodule that can be realized each basic convertor unit
Closely, electrical impact when and then basic convertor unit unlock being avoided to run.
Basic ideas of the invention are controllably pressing the submodule excision strategy in the charging stage, to realize that voltage is equal
Weighing apparatus, and specific implementation means are then belonged to for the technical characteristic of pre-charging stage and unlock 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 inverter flexible HVDC transmission system coordinate press starting method, which is characterized in that including with
Lower step:
(1) for a control period, the submodule excision number in each basic convertor unit bridge arm is determined；
(2) submodule for cutting off corresponding number in each bridge arm, charges to the submodule put into each bridge arm；
Determine that the submodule in each bridge arm cuts off number according to following two principle:
1) and all when the submodule capacitor voltage average value on k-th of basic convertor unit, i-th of bridge arm 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
When upper limit value, the submodule excision number in the bridge arm is gradually increased；
2) when the submodule capacitor voltage average value on k-th of basic convertor unit, i-th of bridge arm 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 greater than a given threshold when, by
Submodule on the decrescence small bridge arm cuts off number；
In each control period, submodule to be cut off is the higher submodule of capacitance voltage in corresponding bridge arm in each bridge arm；
Wherein, k=1,2 ..., N；I=1,2 ..., 6.
2. the flexible HVDC transmission system according to claim 1 based on combination inverter is coordinated to press starting method,
It is characterized in that, when system is passive starting, i-th of bridge arm always cuts off the calculation formula of number upper limit value are as follows:
Nck_limit=Ntotal-Nrated/2
Wherein, Ntotal, Nrated are respectively the total submodule number and specified submodule number of corresponding bridge arm；
When system is active common starting, i-th of bridge arm always cuts off the calculation formula of number upper limit value are as follows:
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 corresponding bridge arm.
3. the flexible HVDC transmission system according to claim 1 or 2 based on combination inverter is coordinated to press starting method,
It is characterized in that, the starting method is further comprising the steps of: the submodule of each basic convertor unit is latched, to each submodule
It is pre-charged, when the submodule capacitor voltage of basic convertor unit is higher than the voltage threshold of setting, according to described two originals
Then determine the submodule excision number in each bridge arm.
4. the flexible HVDC transmission system according to claim 1 or 2 based on combination inverter is coordinated to press starting method,
It is characterized in that, being unlocked fortune to inverter after each basic convertor unit Neutron module charges to specified and holding and stablizes
Row.
5. the flexible HVDC transmission system according to claim 4 based on combination inverter is coordinated to press starting method,
It is characterized in that, in unlock operational process, 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 are risen by the slope of setting.
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| CN107528489B (en) * | 2017-08-23 | 2019-08-06 | 许继集团有限公司 | A kind of modularization multi-level converter and its starting control method |
| CN108054944B (en) * | 2018-01-25 | 2019-05-07 | 湖南大学 | A kind of 50 electric harmonic generator control methods |
| 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 |
| CN108683204B (en) * | 2018-04-08 | 2020-08-25 | 许继集团有限公司 | Charging method for direct current side short circuit of sub-module hybrid converter |
| 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 |
| 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 |
| 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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