CN110011554A - A kind of Modular multilevel converter loop current suppression device and method - Google Patents
A kind of Modular multilevel converter loop current suppression device and method Download PDFInfo
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- CN110011554A CN110011554A CN201910281201.6A CN201910281201A CN110011554A CN 110011554 A CN110011554 A CN 110011554A CN 201910281201 A CN201910281201 A CN 201910281201A CN 110011554 A CN110011554 A CN 110011554A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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Abstract
The present invention relates to a kind of Modular multilevel converter loop current suppression device and methods, wherein 1) circulation inhibition method is the following steps are included: acquire each mutually upper and lower bridge arm current of MMC；2) each phase circulation is calculated；3) each two frequency multiplication of phase circulation and quadruple component are obtained；4) each phase circulation compensation rate is obtained；5) it obtains each phase circulation and inhibits signal；6) phase circulation each in the step 5) inhibition signal is accordingly sent to the submodule of each phase bridge arm of MMC, to control the switch state of half-bridge converter in each phase bridge arm submodule of MMC, to realize the inhibition to each phase circulation of MMC.Compared with prior art, the present invention simultaneously can effectively inhibit two harmonics and quadruple component of each phase circulation of MMC, keep output voltage more smooth, the device of the invention structure is simple, and the circulation inhibition method proposed is effectively reliable.
Description
Technical field
The present invention relates to power electronics fields, more particularly, to a kind of Modular multilevel converter loop current suppression side
Method.
Background technique
Converters are as the core apparatus for realizing transformation of electrical energy, in electric energy production, power transmission, electric power application
Etc. links play indispensable role, be widely used in the fields such as reactive compensation, active power filtering, direct current transportation.MMC
(Modular multilevel converter, Modular multilevel converter) have good expansion, switching loss it is low,
The advantages that fault-tolerant ability is strong is particularly suitable for high-power application.By taking three-phase system as an example, the topological structure of MMC is such as
Shown in Fig. 1, each phase element is made of upper and lower two bridge arms, and each bridge arm is by the identical submodule sm of N number of structure and a bridge
Arm inductance L is connected in series；The submodule number that each bridge arm includes is equal, concatenated bridge arm inductance L value it is also equal, export by two
It draws at a bridge arm midpoint；Each submodule sm is by a half-bridge converter (S1And S2Constitute) and storage capacitor CSMComposition, passes through
The on off operating mode of half-bridge converter switching tube is controlled, i.e., controllable storage capacitor CSMPut into bridge arm circuit or from bridge arm circuit
It cuts out.
Due to capacitor substantial amounts in MMC submodule, it is easy to cause energy distribution between bridge arm uneven, each phase submodule output
The sum of voltage is unequal with DC bus-bar voltage, to generate exchange side ring stream, exchange side ring stream is superimposed upon in bridge arm current, makes
It obtains bridge arm current to be distorted, increases device for power switching rated current capacity and system cost, device for power switching is caused to send out
It is hot serious, or even burn, influence the service life of MMC.The main component of MMC submodule capacitor voltage is fundametal compoment, and base
Wave component can generate two harmonics in output voltage, and two harmonics can generate second harmonic in circulation again, if cannot
Effectively inhibiting, second harmonic can excite four-time harmonic again, so recycles, so that contain a large amount of even-order harmonic components in circulation,
In based on two frequencys multiplication and quadruple component.
By the circulation characteristic of MMC it is found that only existing even-order harmonic in circulation, wherein (6k-4, k=1,2,3 ...) is secondary is
Negative phase-sequence, (6k-2) secondary is positive sequence, and 6k time is zero sequence, and with it is secondary, based on four times.Existing MMC loop current suppression technology can only be independent
Loop current suppression is carried out to a certain phase in single-phase or three-phase, loop current suppression can not be carried out simultaneously to three-phase, and mainly inhibit
Two harmonics in circulation are reduced, reduce quadruple component without inhibiting.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of modular multilevels
Converter loop current suppression device and method can be achieved at the same time effective inhibition to two frequencys multiplication and quadruple Circulation Components, improve
MMC loop current suppression effect.
The purpose of the present invention can be achieved through the following technical solutions: a kind of Modular multilevel converter loop current suppression
Device, including calculation of circulating current module, two double frequency wave traps, quadruple trapper, circulation refer to comparison module and quasi- ratio resonance
Device, the input of the calculation of circulating current module are connected to the output end of each phase of MMC, and output end is connected respectively to two frequency multiplication and falls into
The output end of the input terminal of wave device, the quadruple trapper, two double frequency wave trap and the quadruple trapper connects
It is connected to the input terminal that the circulation refers to comparison module, the circulation is connected to the quasi- ratio with reference to the output end of comparison module
The output end of the input terminal of resonator, the quasi- ratio resonator is connected to the submodule of each phase bridge arm of MMC,
The calculation of circulating current module is for acquiring each mutually upper and lower bridge arm current and calculating each phase circulation of output；
Two double frequency wave trap is used to carry out trap processing to each phase circulation, exports the secondary humorous of each phase circulation to extract
Wave signal；
The quadruple trapper is used to carry out trap processing to each phase circulation, humorous with four times that extract each phase circulation of output
Wave signal；
The circulation is used to calculate two harmonics and quadruple component of each phase circulation with reference to comparison module, distinguishes later
Two harmonics, quadruple component are compared with reference rings stream, to obtain each phase circulation compensation rate；
The quasi- ratio resonator exports loop current suppression signal and gives MMC each phase bridge for tracking each phase circulation compensation rate
The submodule of arm.
A kind of Modular multilevel converter circulation inhibition method, comprising the following steps:
1) each mutually upper and lower bridge arm current of acquisition MMC；
2) it calculates each phase circulation: according to mutually upper and lower bridge arm current each in the step 1), calculating each phase circulation；
3) each two frequency multiplication of phase circulation and quadruple component are obtained: right respectively using two double frequency wave traps and quadruple trapper
Each phase circulation carries out trap processing in the step 2), and two frequencys multiplication and quadruple point of each phase circulation are obtained by calculation later
Amount；
4) obtain each phase circulation compensation rate: by two frequencys multiplication of phase circulation each in the step 3) and quadruple component respectively with
Preset each phase circulation reference value carries out making poor calculating, obtains each phase circulation compensation rate；
5) obtain each phase circulation and inhibit signal: using quasi- ratio resonator to phase circulation compensation rate each in the step 4) into
Line trace obtains each phase circulation and inhibits signal；
6) phase circulation each in the step 5) inhibition signal is accordingly sent to the submodule of each phase bridge arm of MMC, with control
The switch state of half-bridge converter in each phase bridge arm submodule of MMC processed, to realize the inhibition to each phase circulation of MMC.
Preferably, in the step 2) each phase circulation calculation formula are as follows:
Wherein, izjFor the jth phase circulation value of MMC, ipjFor the upper bridge arm current value of MMC jth phase, injFor MMC jth phase
Lower bridge arm current value.
Preferably, in the step 3) two times of trappers transmission function are as follows:
Wherein, s is complex frequency, ω1For the resonance frequency of two times of trappers, Q1For the quality factor of two times of trappers.
Preferably, in the step 3) four times of trappers transmission function are as follows:
Wherein, s is complex frequency, ω2For the resonance frequency of four times of trappers, Q2For the quality factor of four times of trappers.
Preferably, in the step 5) quasi- ratio resonator transmission function are as follows:
Wherein, KPSubject to ratio resonator proportionality coefficient, KrSubject to ratio resonator resonance coefficient, s is complex frequency,
ωcFor cutoff frequency, ω1For the resonance frequency of two times of trappers, ω2For the resonance frequency of four times of trappers.
Preferably, the detailed process of the step 3) are as follows:
3.1) trap is handled: phase circulation each in the step 1) is inputted two double frequency wave traps and quadruple trap respectively
Device obtains the second harmonic signal and four-time harmonic signal of each phase circulation；
3.2) make difference calculate: by second harmonic signal in the step 3.1) and four-time harmonic signal respectively with the step
1) each phase circulation carries out making poor calculating in, obtains two harmonics and quadruple component of each phase circulation.
Preferably, loop current suppression signal is one group of start pulse signal in the step 5).
Compared with prior art, the present invention can be simultaneously to two frequencys multiplication and quadruple circulation of Modular multilevel converter
Effectively inhibited, keeps output voltage more smooth, specifically have the advantage that
One, the present invention is by acquiring each mutually upper and lower bridge arm current, and extracts two harmonics and quadruple point of each phase
Amount, inhibition while can be realized phase circulation each to Modular multilevel converter.
Two, the present invention respectively mentions each phase circulation progress harmonic signal using two double frequency wave traps and quadruple trapper
It takes, is easy to Project Realization, while can guarantee the accuracy of HARMONIC SIGNAL EXTRACTION FROM.
Three, the present invention is based on the DAZ gene characteristics of quasi- ratio resonator, can precisely be tracked to circulation compensation rate,
Effectively improve the reliability of loop current suppression.
Detailed description of the invention
Fig. 1 is the structure chart of three-phase modular multilevel converter；
Fig. 2 is loop current suppression apparatus structure schematic diagram of the invention；
Fig. 3 is circulation inhibition method flow chart of the invention；
Fig. 4 is the control block diagram of embodiment loop current suppression；
Fig. 5 is two double frequency wave trap Bode diagrams of embodiment；
Fig. 6 is the quadruple trapper Bode diagram of embodiment；
Fig. 7 is the frequency analysis figure of a phase circulation of embodiment；
Fig. 8 is that a phase circulation of embodiment inhibits front and back waveform diagram.
Description of symbols in figure: 10 be calculation of circulating current module, and 20 be two double frequency wave traps, and 30 be quadruple trapper, and 40 are
Circulation refers to comparison module, ratio resonator subject to 50.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in Fig. 2, a kind of Modular multilevel converter loop current suppression device, including 10, two times of calculation of circulating current module
Frequency trapper 20, quadruple trapper 30, circulation refer to comparison module 40 and quasi- ratio resonator 50, calculation of circulating current module 10
Input is connected to the output end of each phase of MMC, output end be connected respectively to two double frequency wave traps 20, quadruple trapper 30 it is defeated
Enter to hold, the output end of two double frequency wave traps 20 and quadruple trapper 30 is all connected to the input that circulation refers to comparison module 40
End, circulation are connected to the input terminal of quasi- ratio resonator 50 with reference to the output end of comparison module 40, quasi- ratio resonator 50 it is defeated
Outlet is connected to the submodule of each phase bridge arm of MMC,
Wherein, calculation of circulating current module 10 is for acquiring each mutually upper and lower bridge arm current and calculating each phase circulation of output；Two frequencys multiplication
Trapper 20 is used to carry out trap processing to each phase circulation, to extract the second harmonic signal for exporting each phase circulation；Quadruple is fallen into
Wave device 30 is used to carry out trap processing to each phase circulation, to extract the four-time harmonic signal for exporting each phase circulation；Circulation refer to than
Compared with two harmonics and quadruple component that module 40 is used to calculate each phase circulation, later respectively to two harmonics, quadruple
Component is compared with reference rings stream, to obtain each phase circulation compensation rate；Quasi- ratio resonator 50 is mended for tracking each phase circulation
The amount of repaying, and loop current suppression signal is exported to the submodule of each phase bridge arm of MMC.
A kind of circulation inhibition method based on above-mentioned apparatus, process are as shown in Figure 3:
S1 acquires each mutually upper and lower bridge arm current of MMC；
S2 calculates each phase circulation: according to mutually upper and lower bridge arm current each in step S1, calculating each phase circulation；
S3 obtains each two frequency multiplication of phase circulation and quadruple component: right respectively using two double frequency wave traps and quadruple trapper
Each phase circulation carries out trap processing in step S2, and two frequencys multiplication and quadruple component of each phase circulation are obtained by calculation later；
S4 obtains each phase circulation compensation rate: by two frequencys multiplication of phase circulation each in step S3 and quadruple component respectively with it is default
Each phase circulation reference value carry out making poor calculating, obtain each phase circulation compensation rate；
S5 obtains each phase circulation and inhibits signal: using quasi- ratio resonator to phase circulation compensation rate each in step S4 carry out with
Track obtains each phase circulation and inhibits signal；
Phase circulation each in step S5 inhibition signal is accordingly sent to the submodule of each phase bridge arm of MMC by S6, to control MMC
The switch state of half-bridge converter in each phase bridge arm submodule, to realize the inhibition to each phase circulation of MMC.
According to above-mentioned circulation inhibition method, the control system of embodiment loop current suppression is designed, Fig. 4 show embodiment a phase
The control block diagram of loop current suppression, specific control process are as follows:
1, bridge arm current i in a phase is acquiredpaWith lower bridge arm electric current ina；
2, a phase circulation i is calculatedza:
3, by a phase circulation izaTwo double frequency wave traps are inputted respectively and quadruple trapper carries out trap processing, the letter acquired
Number again with a phase circulation izaIt is poor to make, and obtains two harmonics and quadruple component of a phase circulation, wherein the biography of two double frequency wave traps
Delivery function N1(s) and the transmission function N of quadruple trapper2(s) it is respectively as follows:
In formula, s is complex frequency, ω1For the resonance frequency of two times of trappers, Q1For the quality factor of two times of trappers, ω2
For the resonance frequency of four times of trappers, Q2For the quality factor of four times of trappers；
4, by two harmonics of a phase circulation and quadruple component and preset circulation reference quantityIt is poor to make, and obtains a
Phase circulation compensation rate；
5, a phase circulation compensation rate is tracked by quasi- ratio resonator, obtains a phase circulation and inhibits signalWherein,
The transmission function F of quasi- ratio resonatorPR(s) are as follows:
In formula, KPSubject to ratio resonator proportionality coefficient, KrSubject to ratio resonator resonance coefficient, ωcFor cutoff frequency
Rate.
The simulation model of constructing modular multi-level converter and loop current suppression in MATLAB/Simulink, to this hair
The validity of bright loop current suppression is verified, and the simulation parameter of the present embodiment is as shown in table 1:
1 simulation parameter of table
| Simulation parameters and unit | Numerical value |
| Submodule quantity n/ | 24 |
| Submodule capacitor C/mF | 2 |
| Bridge arm inductance L/mH | 5 |
| Arm resistance R/ Ω | 100 |
| Exchange side voltage rating uk/V | 220 |
| AC system frequency f/Hz | 50 |
| DC voltage Udc/V | 650 |
| Inductor Lg/mH | 1 |
| Exchange side resistance Rg/mΩ | 100 |
Fig. 5 is two double frequency wave trap Bode diagrams of embodiment, and Fig. 6 is the quadruple trapper Bode diagram of embodiment.By Fig. 5
With Fig. 6 it can be seen that two double frequency wave traps and quadruple trapper can preferably filter out two frequencys multiplication and quadruple Circulation Components,
And system is kept to stablize simultaneously.
Fig. 7 show the harmonic wave Fourier analysis of embodiment a phase circulation as a result, a phase circulation two harmonics (100Hz)
With quadruple component (200Hz) accounting maximum.
Fig. 8 show the waveform diagram that embodiment a phase circulation inhibits front and back, is analyzed from Fig. 6: before 0.15 second, a phase ring
Flow valuve is higher, and there are harmonic waves abundant, will affect whole system stable operation；After 0.15 second, due to having carried out circulation
Inhibit, the amplitude and harmonic content of a phase circulation are substantially reduced, and a phase circulation is effectively suppressed, and improves ac-side current waveform
Quality demonstrates the validity of loop current suppression of the present invention.
Claims (8)
1. a kind of Modular multilevel converter loop current suppression device, which is characterized in that fallen into including calculation of circulating current module, two frequencys multiplication
Wave device, quadruple trapper, circulation refer to comparison module and quasi- ratio resonator, and the input of the calculation of circulating current module is connected to
The output end of each phase of MMC, output end are connected respectively to the input terminal of two double frequency wave trap, the quadruple trapper,
The output end of two double frequency wave trap and the quadruple trapper is all connected to the input that the circulation refers to comparison module
End, the circulation are connected to the input terminal of the quasi- ratio resonator, the quasi- ratio resonance with reference to the output end of comparison module
The output end of device is connected to the submodule of each phase bridge arm of MMC,
The calculation of circulating current module is for acquiring each mutually upper and lower bridge arm current and calculating each phase circulation of output；
Two double frequency wave trap is used to carry out trap processing to each phase circulation, to extract the second harmonic letter for exporting each phase circulation
Number；
The quadruple trapper is used to carry out trap processing to each phase circulation, to extract the four-time harmonic letter for exporting each phase circulation
Number；
The circulation is used to calculate two harmonics and quadruple component of each phase circulation with reference to comparison module, later respectively to two
Harmonic, quadruple component are compared with reference rings stream, to obtain each phase circulation compensation rate；
The quasi- ratio resonator exports loop current suppression signal to each phase bridge arm of MMC for tracking each phase circulation compensation rate
Submodule.
2. a kind of Modular multilevel converter circulation inhibition method, which comprises the following steps:
1) each mutually upper and lower bridge arm current of acquisition MMC；
2) it calculates each phase circulation: according to mutually upper and lower bridge arm current each in the step 1), calculating each phase circulation；
3) each two frequency multiplication of phase circulation and quadruple component are obtained: using two double frequency wave traps and quadruple trapper respectively to described
Each phase circulation carries out trap processing in step 2), and two frequencys multiplication and quadruple component of each phase circulation are obtained by calculation later；
4) obtain each phase circulation compensation rate: by two frequencys multiplication of phase circulation each in the step 3) and quadruple component respectively with it is default
Each phase circulation reference value carry out making poor calculating, obtain each phase circulation compensation rate；
5) obtain each phase circulation and inhibit signal: using quasi- ratio resonator to phase circulation compensation rate each in the step 4) carry out with
Track obtains each phase circulation and inhibits signal；
6) phase circulation each in the step 5) inhibition signal is accordingly sent to the submodule of each phase bridge arm of MMC, to control MMC
The switch state of half-bridge converter in each phase bridge arm submodule, to realize the inhibition to each phase circulation of MMC.
3. a kind of Modular multilevel converter circulation inhibition method according to claim 2, which is characterized in that the step
It is rapid 2) in each phase circulation calculation formula are as follows:
Wherein, izjFor the jth phase circulation value of MMC, ipjFor the upper bridge arm current value of MMC jth phase, injFor the lower bridge of MMC jth phase
Arm current value.
4. a kind of Modular multilevel converter circulation inhibition method according to claim 2, which is characterized in that the step
Rapid detailed process 3) are as follows:
3.1) trap is handled: phase circulation each in the step 1) being inputted two double frequency wave traps and quadruple trapper respectively, is obtained
To the second harmonic signal and four-time harmonic signal of each phase circulation；
3.2) make difference to calculate: by second harmonic signal in the step 3.1) and four-time harmonic signal respectively and in the step 1)
Each phase circulation carries out making poor calculating, obtains two harmonics and quadruple component of each phase circulation.
5. a kind of Modular multilevel converter circulation inhibition method according to claim 2, which is characterized in that the step
It is rapid 3) in two times of trappers transmission function are as follows:
Wherein, s is complex frequency, ω1For the resonance frequency of two times of trappers, Q1For the quality factor of two times of trappers；
The transmission function of four times of trappers in the step 3) are as follows:
Wherein, s is complex frequency, ω2For the resonance frequency of four times of trappers, Q2For the quality factor of four times of trappers.
6. a kind of Modular multilevel converter circulation inhibition method according to claim 2, which is characterized in that the step
It is rapid 4) in preset each phase circulation reference value be 0.
7. a kind of Modular multilevel converter circulation inhibition method according to claim 2, which is characterized in that the step
It is rapid 5) in quasi- ratio resonator transmission function are as follows:
Wherein, KPSubject to ratio resonator proportionality coefficient, KrSubject to ratio resonator resonance coefficient, s be Laplce calculate
Son, ωcFor cutoff frequency, ω1For the resonance frequency of two times of trappers, ω2For the resonance frequency of four times of trappers.
8. a kind of Modular multilevel converter circulation inhibition method according to claim 2, which is characterized in that the step
It is rapid 5) in loop current suppression signal be one group of start pulse signal.
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| CN114826008A (en) * | 2022-05-23 | 2022-07-29 | 南通大学 | Control system and method for reducing bridge arm current peak value of MMC (Modular multilevel converter) |
| CN114826008B (en) * | 2022-05-23 | 2022-12-02 | 南通大学 | Control system and method for reducing bridge arm current peak value of MMC (Modular multilevel converter) |
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