CN106230269A - A kind of dcdc converter modulator approach based on MMC - Google Patents
A kind of dcdc converter modulator approach based on MMC Download PDFInfo
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- CN106230269A CN106230269A CN201610835165.XA CN201610835165A CN106230269A CN 106230269 A CN106230269 A CN 106230269A CN 201610835165 A CN201610835165 A CN 201610835165A CN 106230269 A CN106230269 A CN 106230269A
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- voltage
- module
- mmc
- brachium pontis
- modulator approach
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- 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
- H02M1/007—Plural converter units in cascade
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention discloses the modulator approach of a kind of dcdc converter based on MMC.The present invention uses the modulation strategy being independent of transformer voltage ratio.Use this modulation strategy, voltage change ratio can be changed with the break-make of bridge arm module each in flexible topology.Compared to the existing modulation strategy for F2F structure, the modulation strategy that the present invention proposes can be independent of the no-load voltage ratio of AC transformer in device when changing device voltage change ratio, have good module all to press effect.
Description
[technical field]
The invention belongs to high pressure, high power D C/DC convertor controls and modulation field, particularly to a kind of based on MMC
DC/DC changer modulator approach.
[background technology]
In the case of energy resource consumption increases day by day, become the solution energy by distance, high voltage, powerful long-distance transmission
The major way of demand.And along with the increase of transmission distance, direct current transportation is convex in the advantage of the aspect such as energy loss, construction cost
Aobvious.At high-voltage dc transmission electrical domain, current power transmission mode is mainly point-to-point transmission of electricity, is also not carried out in different electric pressures
Connect between direct current network.Owing to traditional transformer can only connect alternating current circuit, therefore to connect direct current network, high pressure, big
Power DC/DC changer is main settling mode.Compared with traditional transformer, DC/DC changer has following features: 1) can be real
Existing DC circuit networking, and beneficially distributed energy accesses；2) volume is little, be readily transported installation；3) control and good stability,
System can be made to operate under different demands by different control strategies；4) intelligent function such as self-inspection, self-shield can be realized, easily
In realizing communication between devices.
And along with the rise of full-control type semiconductor device (such as IGBT etc.), the flexible height with voltage source converter as core
The research of pressure direct current transportation is increasingly extensive with application.Modularization multi-level converter is because of its modularity, good autgmentability, electricity
The features such as pressure grade is high, output harmonic wave content is little are extensively applied in high pressure field.In order to realize high pressure, powerful DC/DC becomes
Parallel operation, existing research mainly proposes two kinds of topologys: one is multiple transformer cascade structure；Another kind is face-based on MMC
To-face structure, i.e. uses transformator to connect two MMC circuit.The method of multiple low capacity changers cascade can reach relatively
High electric pressure, but along with the rising of electric pressure, easily produce bigger circulation between each changer, to control strategy
Requiring the highest, the isolating transformer insulating requirements being in high potential increases the most therewith.Therefore multiple transformer cascade structure is main
Have a meeting, an audience, etc. well under one's control in for conjunction, and of much attention in mesohigh field face-to-face structure.
Found, for control and the modulator approach of face-to-face structure, have research worker to propose by literature search
Kinds of schemes.A kind of is that the nearest level using MMC approaches the method such as modulation, phase-shifting carrier wave modulation, but the method direct current transformation
Rely on the no-load voltage ratio of transformator.One is to propose AC for side's wave modulation, but when realizing direct current transformation, this modulator approach is still
Depend on the no-load voltage ratio of transformator.A kind of modulator approach of the square wave being improvement, transformer voltage ratio can be independent of and realize direct current change
Pressure, but each module of device all presses effect poor, and autgmentability is the most poor.
In view of above technical problem, it is necessary to provide a kind of DC-DC converter modulator approach based on MMC, to overcome in fact
Disadvantages described above.
[summary of the invention]
The invention provides a kind of DC-DC converter modulator approach based on MMC, use the tune being independent of transformer voltage ratio
System strategy, in flexible topology, the break-make of each bridge arm module changes voltage change ratio.
For achieving the above object, the present invention is by the following technical solutions:
The modulator approach of a kind of dcdc converter based on MMC, this changer includes four brachium pontis of intersection, every a pair
The modulus of the brachium pontis conducting intersected is identical, and this modulator approach specifically includes following steps:
(1) output voltage grade according to demand, calculates the voltage ratio of output and input, according to this voltage ratio respectively
Determine modulus s and m of the brachium pontis conducting of primary side and the every pair of cross of secondary side；
(2) two driving signals 1,2 that frequency is identical, size is contrary are sent by signal generator；
(3) two driving signals of step (2) are sent into each half-bridge submodule, the module of conducting respective amount, regulation control
The PI parameter in loop processed, output.
In step (2), the module of conducting respective amount method particularly includes: according to the voltage of each module gathered, enter
Row sequence, according to several modules that ranking results turning-on voltage is less.
Described signal generator, in addition to the driving signal 1,2 sending two frequency being identical, size is contrary, is the most also sent out
Go out to have a flag signal identical with driving signal 1 phase place..
For the brachium pontis of pair of cross, when flag bit is 1, s the module output drive waveforms that voltage is minimum
1, remaining n-s module output drive waveforms 2, when flag bit is 0, n-m the module output drive waveforms that voltage is minimum
1, remaining m module output drive waveforms 2；For the brachium pontis that other the second couple is intersected, when flag bit is 1, electricity
M the module output drive waveforms 1 that pressure is minimum, remaining n-m module output drive waveforms 2, when flag bit is 0, voltage
N-s minimum module output drive waveforms 1, remaining s module output drive waveforms 2.
Compared with prior art, the present invention at least has the advantages that
Compared to the existing modulation strategy for F2F structure, the modulation strategy that the present invention proposes is changing device voltage
The no-load voltage ratio of AC transformer in device can be independent of during no-load voltage ratio, have good module all to press effect.
[accompanying drawing explanation]
Fig. 1 is face-to-face structural representation.
Fig. 2 is 3/2 modulation each module status schematic diagram.A () is the t1 moment；B () is the t2 moment.
Fig. 3 is 3/2 modulation each module driving signal sequential chart.
Fig. 4 is that each bridge arm module controls and modulation program flow chart.A () is 1,4 brachium pontis programs；B () is 2,3 brachium pontis journeys
Sequence.
Fig. 5 is F2F structure control method schematic diagram.
Fig. 6 is system input and output simulation waveform figure.
Fig. 7 is that system one brachium pontis all presses simulation waveform figure.
[detailed description of the invention]
Based on object above, the present invention is divided into following components:
1. analyze the principle of the existing modulator approach s/m modulation being independent of transformer voltage ratio, and illustrate that it all presses effect
Limitation；
2. distributed by the driving instruction of each module in programming realization system；
3. according to the command value set, making system properly functioning, output setting voltage also reaches preferably all to press effect.
In order to realize electric pressure conversion and don't rely on AC transformer no-load voltage ratio, first the present invention analyzes the DC/ of design
DC changer modulation principle, and according to desired modulation timing G-Design program, it is achieved the preferable of changer all presses effect.
Specific as follows:
(1) s/m modulates operation logic
S/m modulation refers to when system is run, and the brachium pontis of intersection is respectively turned on s module and m module, makes system hand over
Stream side can produce the square wave of corresponding amplitude, as it is shown in figure 1, hereafter in Fig. 1 as a example by inverter side (primary side).
In friendship-lineal system, it is assumed that the t1 moment, the number of modules of 1,4 brachium pontis conductings is s, and the number of modules of 2,3 brachium pontis conductings is
m.Then AC voltage Uac, whereinThenTherefore, the output voltage of AC can be changed by changing the value of s Yu m.Rectification side is with inverse
Become side to be similar to, but every brachium pontis conduction module number can be different from inverter side.
(2) module drive and all pressure algorithm designs
Number of modules s, the m that turn on due to each brachium pontis do not have restriction relation, therefore with total number of modules n of each brachium pontis conducting
Each being switched on or off is spaced the number of modules being required for calculating brachium pontis conducting and all presses calculating.With 4 modules of every brachium pontis it is
Example, it is assumed that when s=3, m=2, the on off state of inverter side as in figure 2 it is shown, each bridge arm module drive waveforms sequential as shown in Figure 3.
If the most all pressing calculating, some modules to be in normally open all the time at each critical moment, thus cause system unstable.Cause
This, need to add capacitive balance algorithm at each critical moment.Control flow chart is as shown in Figure 4.First system is adopted into two kinds contrary
Drive waveforms and flag bit, secondly according to the difference of each moment flag bit, it is judged that the most each brachium pontis needs the module of conducting
Number s or m.Then each module voltage is sorted, according to several modules that ranking results turning-on voltage is less.
(3) controller design
Phase shifting angle controls can be by controlling the phase angle difference through-put power at transformator two ends, owing to system is output as direct current,
Therefore have only to consider the transmission of active power.When power one-way transmission and load are fixing, δ and power, output voltage positive
Close.Therefore the phase shifting angle control strategy used is as shown in Figure 5.After determining output module number, each module of primary side is by square-wave signal
Directly drive.The signal that drives of secondary side is obtained by the driving signal delay Δ t of primary side, and wherein Δ t is that Voltage Feedback calculates
The phase shift time corresponding to the phase shifting angle gone out.
Seeing Fig. 4 and Fig. 5, the present invention can be by changing the value of s, m, it is ensured that all disobeys when different output voltage grade
Rely transformer voltage ratio, ensure that each module voltage equalizes simultaneously.Specifically comprise the following steps that
Step 1, after determining the output voltage grade of demand, calculates the voltage ratio of output and input, and according to this ratio
Determine primary side and secondary side s, m value respectively.
Step 2, is produced two square wave driving signals 1,2 that frequency is identical, size is contrary by signal generator, produces simultaneously
One flag signal identical with driving signal 1 phase place.
Step 3, according to flow chart shown in Fig. 4, determines the number driving signal 1,2 required under each flag signal and incites somebody to action
Drive the signal corresponding each module of sequence.
Step 4, by each half-bridge submodule of each driving signal feeder, and regulates the PI parameter controlling loop, is allowed to
Normal output.
A kind of based on MMC DC/DC changer modulator approach that the present invention proposes, is a kind of to be independent of transformer voltage ratio
Modulation strategy.Use this modulation strategy, voltage change ratio can be changed with the break-make of bridge arm module each in flexible topology.Now hand over
Convertor transformer only has the effect of electrical isolation, when system to electrical isolation less demanding time, use this modulation strategy to omit
AC transformer.Simulation result, as shown in accompanying drawing 6 and Fig. 7, refers to Fig. 6, and system can reach setting voltage when 0.1s.Please
Refering to Fig. 7,4 curves shown in figure are the voltage curve of four modules of one of them brachium pontis of device, through this patent algorithm
After, each module voltage is stable to fluctuate near average, the most each module capacitance electric voltage equalization.
Claims (4)
1. a modulator approach for dcdc converter based on MMC, this changer includes four brachium pontis of intersection, every a pair friendship
The modulus of the brachium pontis conducting of fork is identical, it is characterised in that: comprise the following steps:
(1) output voltage grade according to demand, calculates the voltage ratio of output and input, determines respectively according to this voltage ratio
Modulus s and m of the brachium pontis conducting of primary side and the every pair of cross of secondary side；
(2) two driving signals 1,2 that frequency is identical, size is contrary are sent by signal generator；
(3) two driving signals of step (2) being sent into each half-bridge submodule, the module of conducting respective amount, regulation controls back
The PI parameter on road, output.
The modulator approach of a kind of dcdc converter based on MMC the most according to claim 1, it is characterised in that: in step
(2) in, the module of conducting respective amount method particularly includes: according to the voltage of each module gathered, be ranked up, according to sequence
Several modules that result turning-on voltage is less.
The modulator approach of a kind of dcdc converter based on MMC the most according to claim 1 and 2, it is characterised in that: described
Signal generator in addition to the driving signal 1,2 sending two frequency being identical, size is contrary, the most also sent one with drive
The flag signal that dynamic signal 1 phase place is identical.
The modulator approach of a kind of dcdc converter based on MMC the most according to claim 3, it is characterised in that:
For the brachium pontis of pair of cross, when flag bit is 1, s the module output drive waveforms 1 that voltage is minimum, remaining
Under n-s module output drive waveforms 2, when flag bit is 0, minimum n-m the module of voltage exports drive waveforms 1, remaining
Under m module output drive waveforms 2；
For the brachium pontis that other the second couple is intersected, when flag bit is 1, m the module output driving ripple that voltage is minimum
Shape 1, remaining n-m module output drive waveforms 2, when flag bit is 0, n-s the module output driving ripple that voltage is minimum
Shape 1, remaining s module output drive waveforms 2.
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| CN201610835165.XA CN106230269B (en) | 2016-09-20 | 2016-09-20 | A kind of dcdc converter modulator approach based on MMC |
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| CN201610835165.XA CN106230269B (en) | 2016-09-20 | 2016-09-20 | A kind of dcdc converter modulator approach based on MMC |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107517007A (en) * | 2017-10-18 | 2017-12-26 | 西安交通大学 | A kind of nearly square-wave frequency modulation method of MMC type HVDC converter |
| CN109038693A (en) * | 2018-07-25 | 2018-12-18 | 西安交通大学 | A kind of power distribution network based on MMC structure multiterminal no-load voltage ratio adjustable DC transformer topology and its control method |
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| CN104935175A (en) * | 2015-06-16 | 2015-09-23 | 上海交通大学 | Improved two-level modulation method of isolated-form modularization multi-level direct current converter |
| CN105099206A (en) * | 2015-08-18 | 2015-11-25 | 南车株洲电力机车研究所有限公司 | Direct current-direct current solid-state transformer |
| CN105450031A (en) * | 2015-12-21 | 2016-03-30 | 中国电力科学研究院 | Modulation strategy of DC (Direct Current)-DC convertor and submodule voltage-sharing method thereof |
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2016
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| CN104935175A (en) * | 2015-06-16 | 2015-09-23 | 上海交通大学 | Improved two-level modulation method of isolated-form modularization multi-level direct current converter |
| CN105099206A (en) * | 2015-08-18 | 2015-11-25 | 南车株洲电力机车研究所有限公司 | Direct current-direct current solid-state transformer |
| CN105450031A (en) * | 2015-12-21 | 2016-03-30 | 中国电力科学研究院 | Modulation strategy of DC (Direct Current)-DC convertor and submodule voltage-sharing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107517007A (en) * | 2017-10-18 | 2017-12-26 | 西安交通大学 | A kind of nearly square-wave frequency modulation method of MMC type HVDC converter |
| CN109038693A (en) * | 2018-07-25 | 2018-12-18 | 西安交通大学 | A kind of power distribution network based on MMC structure multiterminal no-load voltage ratio adjustable DC transformer topology and its control method |
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| CN106230269B (en) | 2019-02-05 |
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