CN105245087B - Modularization multi-level converter capacitor voltage-sharing control method based on classification - Google Patents
Modularization multi-level converter capacitor voltage-sharing control method based on classification Download PDFInfo
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Abstract
The invention belongs to electric power system model emulation and control technology field, more particularly to a kind of modularization multi-level converter capacitor voltage-sharing control method based on classification.Characterized in that, by the specified fluctuation range of submodule capacitor voltage, all electric capacity in bridge arm are classified, and count the electric capacity number included in each classification；According to the direction of bridge arm current, classification carries out prioritizing；According to needing to put into electric capacity number and put in order, it is determined that sequence class；It will be put into prior to all electric capacity in the classification for the class that sorts, need to put into the electric capacity input of number in sequence class selection residue.This method reduces the switching frequency of switching device and the amount of calculation of control method, improves the response speed of control system in the case where ensureing voltage fluctuation of capacitor scope.
Description
Technical field
The invention belongs to operation and control of electric power system technical field, is related to a kind of modularization multi-level converter electric capacity electricity
Press balance control method.
Background technology
Modularization multi-level converter (Modular Multilevel Converter, MMC) is that one kind uses modularization
The voltage source converter (Voltage Source based Converter, VSC) of design.Modularization multi-level converter is not only
The characteristics of with conventional voltage source transverter independent control active reactive, and, output voltage ripple harmonic wave low with switching frequency
The features such as content is low.
Capacitance energy storage element in modularization multi-level converter is distributed in submodule, causes the balanced control of capacitance voltage
System is difficult.Traditional modularization multi-level converter needs to enter all submodule capacitor voltages to capacitance voltage Balance route
Row sequence, the submodule of input is then determined according to the input number of nearest level modulation output and bridge arm current.In bridge arm
Electric current be more than 0 when, since voltage it is low trigger；And bridge arm current be less than 0 when, then since voltage it is high trigger.So make
The high submodule electric discharge of capacitance voltage is obtained, the low submodule charging of capacitance voltage, ensure that the equilibrium of submodule capacitor voltage.
On the one hand existing method causes the rise of switching frequency, on the other hand carrying with transmission line capability and voltage class
Rise, the level number of modularization multi-level converter also improves, it is necessary to be ranked up to all submodules therewith, causes amount of calculation
Rising.
The content of the invention
In order to solve the above problems, the present invention proposes a kind of modularization multi-level converter capacitor voltage equalizing based on classification
Control method.
The technical scheme is that：
Modularization multi-level converter capacitor voltage-sharing control method based on classification, it is characterised in that comprise the following steps：
Step 1, according to the specified fluctuation range Δ U of submodule capacitor voltagecrefWith the last switching state FP of electric capacitypre,
All electric capacity in bridge arm are classified, and count the electric capacity number included in each classification；
Step 2, the direction according to bridge arm current, the arrangement of row major ordering in launching is entered to the classification that step 1 obtains；
Step 3, foundation need to put into electric capacity number NfireWith put in order, it is determined that sequence class；
Step 4, after being put into prior to all electric capacity in the classification for the class that sorts, residue is selected to need to throw in the class that sorts
Enter the electric capacity input of number.
Rated voltage fluctuation range Δ U in the step 1crefIt is previously given according to system operation, and is not zero,
UcrefFor electric capacity rated voltage, the upper threshold value U of its fluctuation rangeup, the lower threshold value U of fluctuation rangedownExpression formula be：
Described is categorized as to all electric capacity in bridge arm：The electric capacity in all submodules in bridge arm is traveled through, works as capacitance voltage
UCMore than or equal to UupWhen, the submodule is UP classes；As capacitance voltage UCLess than or equal to UdownWhen, the submodule is DOWN classes；
As capacitance voltage UCLess than UupMore than UdownAnd the last switching state FP of electric capacitypreTo put into state, then the submodule is ON
Class；As capacitance voltage UCLess than UupMore than UdownAnd the last switching state FP of electric capacitypreTo cut off state, the then submodule
For OFF classes；According to obtained classification results, the number N of statistics DOWN class submodulesDOWN, ON class submodules number NON、OFF
The number N of class submoduleOFF, UP class submodules number NUP。
The detailed process of preferential ordering in launching arrangement is in the step 2：As bridge arm current IarmMore than or equal to 0, electric capacity
The low electric capacity preecedence requirement of voltage is charged, so as to which priority is followed successively by DOWN classes, ON classes, OFF classes, UP classes；Work as bridge arm
Electric current IarmDuring less than 0, the high electric capacity of capacitance voltage is preferentially discharged, priority be followed successively by UP classes, ON classes, OFF classes,
DOWN classes；According to priority, the 1st class, the 2nd class, the 3rd class, the 4th class are defined as successively.
The step 3 determines concretely comprising the following steps for sequence class：When needing to put into electric capacity number NfireMore than or equal to 0 and it is less than
1st class electric capacity number, then the 1st class is sequence class；Work as NfireMore than or equal to the 1st class electric capacity number and it is less than preceding 2 class electric capacity number,
Then the 2nd class is sequence class；Work as NfireMore than or equal to preceding 2 class electric capacity number and it is less than the 3rd class electric capacity number, then the 3rd class is sequence
Class；Work as NfireMore than or equal to preceding 3 class electric capacity number and it is less than or equal to the 4th class electric capacity number, then the 4th class is sequence class.
After all being put into prior to all electric capacity in the classification for the class that sorts in the step 4, calculating residue needs to put into
Submodule number Nleft
J represents the numbering of sequence class, N in formulakFor the electric capacity number of kth class；
When bridge arm current is more than 0, then the minimum N of capacitance voltage is selectedleftIndividual submodule input；When bridge arm current be less than 0,
Then select the maximum N of capacitance voltageleftIndividual submodule input；According to the difference of classification, to the class Neutron module capacitance voltage that sorts
It is different to be ranked up the sort method of use, when sequence class is UP classes or is DOWN classes, then using quick sorting algorithm to row
Sequence class Neutron module capacitance voltage is ranked up；When sorting, class is ON classes or OFF classes, using a kind of pseudo- sort method.
The pseudo- sort method is：First, obtain participating in the maximum Max of the capacitance voltage of sequence and participate in the electricity of sequence
Hold the minimum M in of voltage, the section [Min, Max] of capacitance voltage is divided into M minizone at equal intervals, then each section
Span Delta=(Max-Min)/M, the 1st to M minizone be followed successively by [Min, Min+Delta), [Min+Delta, Min+
2Delta) ... [Max-Delta, Max], judge that electric capacity falls into the position of minizone successively according to capacitance voltage size, use
Vectorial ViStorage falls into the electric capacity numbering of minizone, so as to overall ordering vector V={ V1,V2,…,VM}。
Beneficial effect：
The present invention proposes the modularization multi-level converter capacitance voltage balance control method based on Classified optimization.Dividing
Lower threshold value on voltage is introduced in class process, the fluctuation range of the capacitance voltage of submodule can be efficiently controlled.In upper lower threshold value
Between submodule, according to last time switching state classified, greatly reduce the switching frequency of submodule.The present invention is only
Need to be ranked up one kind therein, and control algolithm is reduced using a kind of pseudo- sequence to the classification between upper lower threshold value
The calculating time.
Brief description of the drawings
Fig. 1 is capacitance voltage balance control method flow chart of the present invention；
Fig. 2 is electric capacity classification schematic diagram；
Fig. 3 is classification priority ordering figure；
Fig. 4 determines flow chart for sequence class；
Fig. 5 is the module of the present invention realized in PSCAD；
Embodiment
With reference to specific embodiment, the present invention is expanded on further.
Show that triggering number needs to put into electric capacity number N in modularization multi-level converter control systemfireAfterwards, it is electric
Hold rated voltage UcrefFor setting value, the submodule input of capacitance voltage Balance route algorithms selection response number.It is specific real
It is as shown in Figure 1 to apply flow.
Step 1, electric capacity classification：By the specified fluctuation range of submodule capacitor voltage, all electric capacity in bridge arm are classified, and
Count the electric capacity number included in each classification.The classification of electric capacity as shown in Fig. 2
Step 2, classification prioritization：According to the direction of bridge arm current, row major order row is entered to the classification that step 1 obtains
Row.Put in order as shown in Figure 3.
Step 3, determine sequence class：Electric capacity number and step 2 obtain puts in order according to needing to put into, it is determined that sequence
Class.Sequence class determines that calculating process is as shown in Figure 4.Wherein NjRepresent the number of electric capacity in jth class.For example, now bridge arm current
More than 0, NDOWN=3, NON=56, NOFF=30, NUP=1.It is 1 if necessary to put into number, then the class that sorts is DOWN classes；If
It is 80 to need to put into number, then the class that sorts is OFF classes.
Step 4, selection electric capacity input：It will be put into prior to all electric capacity in the classification for the class that sorts, in sequence class selection
Residue needs to put into the electric capacity input of number.
The custom block for realizing the above method is write on PSCAD/EMTDC, custom block is as shown in figure 5, a left side
Port inputs now obtains bridge arm current size for the given input submodule number of higher level's control, upper port input, and lower port is defeated
Enter capacitance voltage in bridge arm, right output port output capacitance switching signal.In implementation process, the number M of minizone at equal intervals of puppet sequence
Value is 3.In the modular multilevel converter system of single-ended 101 level simulation comparison has been carried out with conventional method.
Using the method in the present invention, the capacitance voltage of each submodule is controlled within certain limit, meets to require.
As shown in table 1, conventional method causes switching device to have very high switching frequency, and the present invention has relatively low open
Close frequency.
| Switching frequency | Calculate time-consuming | |
| Conventional method | 7735 | 3.6875s |
| Based on Classified optimization method | 120 | 0.34375s |
Control time is in 1s simulation times in table 1, and the CPU of the capacitance voltage Balance route algorithm of single bridge arm is calculated
It is time-consuming, there was only 1/10th of conventional method using the present invention.
Above-mentioned contrast, the present invention is fully demonstrated in the capacitance voltage Balance route of modularization multi-level converter
Superiority.Lower threshold value in classification, it ensure that the fluctuation range of submodule capacitor voltage；Reduce the son for participating in sequence by classification
Number of modules；Last input submodule priority level is improved, is effectively reduced the switching frequency of switching device；In classification
The pseudo- sequence of electric capacity between lower threshold value further reduces the calculating time of control mode.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection domain of claim
It is defined.
Claims (4)
1. the modularization multi-level converter capacitor voltage-sharing control method based on classification, comprises the following steps：
Step 1, according to the specified fluctuation range Δ U of submodule capacitor voltagecrefWith the last switching state FP of electric capacitypre, to bridge
All electric capacity are classified in arm, and count the electric capacity number included in each classification；
Step 2, the direction according to bridge arm current, the arrangement of row major ordering in launching is entered to the classification that step 1 obtains；
Step 3, foundation need to put into electric capacity number NfireWith put in order, it is determined that sequence class；
Step 4, after being put into prior to all electric capacity in sequence class classification, residue is selected to need to put into number in the class that sorts
Electric capacity input；Characterized in that, rated voltage fluctuation range Δ U in the step 1crefIt is previously given according to system operation
, and be not zero, UcrefFor electric capacity rated voltage, the upper threshold value U of its fluctuation rangeup, the lower threshold value U of fluctuation rangedownTable
It is up to formula：
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Described is categorized as to all electric capacity in bridge arm：The electric capacity in all submodules in bridge arm is traveled through, as capacitance voltage UCIt is more than
Or equal to UupWhen, the submodule is UP classes；As capacitance voltage UCLess than or equal to UdownWhen, the submodule is DOWN classes；Work as electricity
Hold voltage UCLess than UupMore than UdownAnd the last switching state FP of electric capacitypreTo put into state, then the submodule is ON classes；
As capacitance voltage UCLess than UupMore than UdownAnd the last switching state FP of electric capacitypreTo cut off state, then the submodule is
OFF classes；According to obtained classification results, the number N of statistics DOWN class submodulesDOWN, ON class submodules number NON, OFF classes
The number N of submoduleOFF, UP class submodules number NUP。
2. the modularization multi-level converter capacitor voltage-sharing control method based on classification, its feature exist according to claim 1
In the detailed process of preferential ordering in launching arrangement is in the step 2：As bridge arm current IarmMore than or equal to 0, capacitance voltage
Low electric capacity preecedence requirement is charged, so as to which priority is followed successively by DOWN classes, ON classes, OFF classes, UP classes；Work as bridge arm current
IarmDuring less than 0, the high electric capacity of capacitance voltage is preferentially discharged, and priority is followed successively by UP classes, ON classes, OFF classes, DOWN classes；
According to priority, the 1st class, the 2nd class, the 3rd class, the 4th class are defined as successively.
3. the modularization multi-level converter capacitor voltage-sharing control method based on classification, its feature exist according to claim 2
In it is determined that sequence class concretely comprises the following steps：When needing to put into electric capacity number NfireMore than or equal to 0 and it is less than the 1st class electric capacity number,
Then the 1st class is sequence class；Work as NfireMore than or equal to the 1st class electric capacity number and it is less than preceding 2 class electric capacity number, then the 2nd class is sequence
Class；Work as NfireMore than or equal to preceding 2 class electric capacity number and it is less than the 3rd class electric capacity number, then the 3rd class is sequence class；Work as NfireMore than etc.
In preceding 3 class electric capacity number and it is less than or equal to the 4th class electric capacity number, then the 4th class is sequence class.
4. the modularization multi-level converter capacitor voltage-sharing control method based on classification, its feature exist according to claim 3
In, after prior to all electric capacity in the classification for the class that sorts all input, the remaining submodule number N for needing to put into of calculatingleft：
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J represents the numbering of sequence class, N in formulakFor the electric capacity number of kth class；
When bridge arm current is more than 0, then the minimum N of capacitance voltage is selectedleftIndividual submodule input；When bridge arm current be less than 0, then select
Select the maximum N of capacitance voltageleftIndividual submodule input；According to the difference of classification, sequence class Neutron module capacitance voltage is carried out
The sort method used that sorts is different, when sequence class is UP classes or is DOWN classes, then using quick sorting algorithm to the class that sorts
Neutron module capacitance voltage is ranked up；When sorting, class is ON classes or OFF classes, using a kind of pseudo- sort method；
The pseudo- sort method is：First, the maximum Max for obtaining participating in the capacitance voltage of sequence and the electric capacity electricity for participating in sequence
The minimum M in of pressure, the section [Min, Max] of capacitance voltage is divided into M minizone at equal intervals, then the span in each section
Delta=(Max-Min)/M, the 1st to M minizone be followed successively by [Min, Min+Delta), [Min+Delta, Min+
2Delta) ... [Max-Delta, Max], judge that electric capacity falls into the position of minizone successively according to capacitance voltage size, use
Vectorial ViStorage falls into the electric capacity numbering of minizone, so as to overall ordering vector V={ V1,V2,…,VM}。
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| FR3053854B1 (en) * | 2016-07-05 | 2018-08-17 | Supergrid Institute | MODULE FOR CONTROLLING THE INTERNAL ENERGY OF A CONVERTER |
| CN107342697B (en) * | 2017-07-13 | 2019-04-23 | 华中科技大学 | Stable state negative level exports the acquisition methods of lower mixed type MMC submodule capacitance parameter |
| CN108832826B (en) * | 2018-05-25 | 2020-10-23 | 广东电网有限责任公司电力调度控制中心 | MMC capacitor voltage balance control method suitable for FPGA |
| CN109274283A (en) * | 2018-08-29 | 2019-01-25 | 中国电力科学研究院有限公司 | The method and system of control MMC capacitor voltage balance based on dynamic layered sequence |
| CN110867885B (en) * | 2019-11-26 | 2021-03-09 | 全球能源互联网研究院有限公司 | Submodule alternation control method of direct current energy consumption device |
| CN111382550B (en) * | 2020-03-10 | 2023-04-18 | 南方电网科学研究院有限责任公司 | Dynamic combination real-time simulation method of modular multilevel converter and use method |
| CN113410993B (en) * | 2021-05-31 | 2022-06-03 | 南京师范大学 | Method and device for controlling modular multi-level-to-level converter of finite state machine |
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