CN106230269B - 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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- CN106230269B CN106230269B CN201610835165.XA CN201610835165A CN106230269B CN 106230269 B CN106230269 B CN 106230269B CN 201610835165 A CN201610835165 A CN 201610835165A CN 106230269 B CN106230269 B CN 106230269B
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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 a kind of modulator approach of dcdc converter based on MMC.The present invention is using the modulation strategy for not depending on transformer voltage ratio.Using the modulation strategy, voltage change ratio can be changed with the on-off of each bridge arm module in flexible modulation topology.Compared to the existing modulation strategy for F2F structure, modulation strategy proposed by the present invention can not depend on the no-load voltage ratio of AC transformer in device when changing device voltage change ratio, there is good module equalizing effect.
Description
[technical field]
It is the invention belongs to high pressure, high power D C/DC convertor controls and modulation field, in particular to a kind of based on MMC's
DC/DC converter modulator approach.
[background technique]
In the case where energy consumption increases day by day, is become by long range, high voltage, powerful long-distance transmission and solve the energy
The major way of demand.And with the increase of transmission distance, direct current transportation energy loss, in terms of advantage it is convex
It is aobvious.In high-voltage dc transmission electrical domain, current power transmission mode is mainly point-to-point transmission of electricity, and there are no realize in different voltages grade
It is connected between DC grid.It is high pressure, big in order to connect DC grid since traditional transformer can only connect alternating current circuit
Power DC/DC converter is main settling mode.Compared with traditional transformer, DC/DC converter has following features: 1) can be real
Existing DC circuit networking, and be conducive to distributed energy access；2) small in size, be readily transported installation；3) control and stability are good,
It can make system operation by different control strategies under different needs；4) intelligent functions such as self-test, self-shield can be achieved, easily
In realization communication between devices.
And with the rise of full-control type semiconductor devices (such as IGBT), it is high as the flexibility of core using voltage source converter
Press the research of direct current transportation and application increasingly extensive.Modularization multi-level converter is because of its modularization, good scalability, electricity
The features such as grade is high, output harmonic wave content is small is pressed to be widely applied in high pressure field.In order to realize that high pressure, powerful DC/DC become
Parallel operation, existing research mainly propose two kinds of topologys: one is multiple transformer cascade structures；Another kind is the face- based on MMC
To-face structure connects two MMC circuits using transformer.Multiple cascade methods of low capacity converter can achieve compared with
High voltage class, but with the raising of voltage class, it is easy to produce biggish circulation between each converter, to control strategy
It is required that also higher, the isolating transformer insulating requirements in high potential are also increased with it.Therefore multiple transformer cascade structure is main
It has a meeting, an audience, etc. well under one's control used in conjunction, and is got more attention in mesohigh field face-to-face structure.
Find, for the control and modulator approach of face-to-face structure, there is researcher's proposition by literature search
Kinds of schemes.One is the nearest level using MMC to approach the methods of modulation, phase-shifting carrier wave modulation, but this method direct current transformation
Rely on the no-load voltage ratio of transformer.When one is proposing that exchange side is square wave modulation, but realize direct current transformation, the modulator approach is still
No-load voltage ratio dependent on transformer.One is the modulator approach of improved square wave, transformer voltage ratio can not depended on and realize that direct current becomes
Pressure, but each module equalizing effect of device is poor, and scalability is also poor.
In view of the above technical problem, it is really necessary to provide a kind of DC-DC converter modulator approach based on MMC, to overcome
Disadvantages described above.
[summary of the invention]
The DC-DC converter modulator approach based on MMC that the present invention provides a kind of, using the tune for not depending on transformer voltage ratio
System is tactful, and the on-off of each bridge arm module changes voltage change ratio in flexible modulation topology.
To achieve the above object, the invention adopts the following technical scheme:
A kind of modulator approach of the dcdc converter based on MMC, the converter include four bridge arms of intersection, every a pair
Intersection bridge arm conducting modulus it is identical, the modulator approach specifically includes the following steps:
(1) output voltage grade according to demand calculates the voltage ratio of output with input, is distinguished according to the voltage ratio
Determine the modulus s and m of the bridge arm conducting of primary side and the every a pair of cross of secondary side；
(2) two driving signals 1,2 that frequency is identical, size is opposite are issued by signal generator；
(3) two driving signals of step (2) are sent into each half-bridge submodule, the module of corresponding number is connected, adjust control
The PI parameter in circuit processed, output.
In step (2), the module of corresponding number is connected method particularly includes: according to the voltage of each module of acquisition, into
Row sequence, according to the lesser several modules of ranking results turning-on voltage.
The signal generator is further also sent out other than issuing two driving signals 1,2 that frequency is identical, size is opposite
There is a flag signal identical with 1 phase of driving signal out.
For the bridge arm of a pair of cross, when flag bit is 1, the smallest s module output driving waveform of voltage
1, remaining n-s module output driving waveform 2, when flag bit is 0, the smallest n-m module output driving waveform of voltage
1, remaining m module output driving waveform 2；For other second for the bridge arm intersected, when flag bit is 1, electricity
Press the smallest m module output driving waveform 1, remaining n-m module output driving waveform 2, when flag bit is 0, voltage
The smallest n-s module output driving waveform 1, remaining s module output driving waveform 2.
Compared with prior art, the present invention at least has the advantages that
Compared to the existing modulation strategy for F2F structure, modulation strategy proposed by the present invention is changing device voltage
The no-load voltage ratio that AC transformer in device can not be depended on when no-load voltage ratio has good module equalizing effect.
[Detailed description of the invention]
Fig. 1 is face-to-face structural schematic diagram.
Fig. 2 is 3/2 each module status schematic diagram of modulation.It (a) is the t1 moment；It (b) is the t2 moment.
Fig. 3 is 3/2 each module driving signal timing diagram of modulation.
Fig. 4 is the control of each bridge arm module and modulation program flow chart.It (a) is 1,4 bridge arm programs；It (b) is 2,3 bridge arm journeys
Sequence.
Fig. 5 is F2F structure control method schematic diagram.
Fig. 6 is system input and output simulation waveform.
Fig. 7 is that one bridge arm of system presses simulation waveform.
[specific embodiment]
Based on object above, the present invention is divided into following components:
1. analyzing the principle of the existing modulator approach s/m modulation for not depending on transformer voltage ratio, and illustrate its equalizing effect
Limitation；
2. passing through the driving instruction distribution of each module in programming realization system；
3. operating normally system according to the instruction value of setting, output setting voltage simultaneously reaches preferable equalizing effect.
In order to realize voltage class transformation and not depend on AC transformer no-load voltage ratio, the present invention analyzes the DC/ of design first
DC converter modulation principle, and according to desired modulation timing G- Design program, realize the preferable equalizing effect of converter.
It is specific as follows:
(1) s/m modulates operation logic
S/m modulation refers to that the bridge arm of intersection is respectively turned on s module and m module, hands over system when system is run
Stream side can generate the square wave of corresponding amplitude, as shown in Figure 1, hereafter by taking inverter side in Fig. 1 (primary side) as an example.
In friendship-direct line system, it is assumed that t1 moment, the number of modules of 1,4 bridge arms conducting are s, and the number of modules of 2,3 bridge arms conducting is
m.Then exchange side voltage Uac, whereinThenTherefore, the output voltage of exchange side can be changed by the value of change s and m.Rectification side with it is inverse
It is similar to become side, but every bridge arm conduction module number can be different from inverter side.
(2) module drive and pressure algorithm design
Since number of modules s, m of the conducting of each bridge arm total number of modules n be connected with each bridge arm do not have the constraint relationship,
Interval is each switched on or off to require to calculate the number of modules of bridge arm conducting and carry out pressure to calculate.It is with 4 modules of every bridge arm
Example, it is assumed that when s=3, m=2, the switch state of inverter side is as shown in Fig. 2, each bridge arm module drive waveforms timing is as shown in Figure 3.
If some modules are in normally open always, unstable so as to cause system in each critical moment without pressing calculating.Cause
This, needs to be added capacitive balance algorithm in each critical moment.Control flow chart is as shown in Figure 4.System is adopted opposite into two kinds first
Drive waveforms and flag bit, secondly according to the difference of each moment flag bit, each bridge arm needs the module be connected at this time for judgement
Number s or m.Then each module voltage is sorted, according to the lesser several modules of ranking results turning-on voltage.
(3) controller design
Phase shifting angle control can be direct current since system exports by the phase angle difference transimission power at control transformer both ends,
Therefore only need to consider the transmission of active power.When power one-way transmission and fixed load, δ and power, output voltage positive
It closes.Therefore the phase shift angle control policy used is as shown in Figure 5.After determining output module number, each module of primary side is by square-wave signal
It directly drives.The driving signal of secondary side is obtained by the driving signal delay Δ t of primary side, and wherein Δ t is Voltage Feedback calculating
The phase shift time corresponding to phase shifting angle out.
Referring to fig. 4 with Fig. 5, the present invention can by change s, m value, guarantee to disobey in different output voltage grades
Rely transformer voltage ratio, while guaranteeing that each module voltage is balanced.Specific step is as follows:
Step 1, after the output voltage grade for determining demand, the voltage ratio of output with input is calculated, and according to the ratio
Determine s, m value of primary side and secondary side respectively.
Step 2, two square wave driving signals 1,2 that frequency is identical, size is opposite are generated by signal generator, generated simultaneously
One flag signal identical with 1 phase of driving signal.
Step 3, flow chart, the number of the driving signal 1,2 needed for determining under each flag signal simultaneously will according to Fig.4,
The corresponding each module of driving signal sequence.
Step 4, by each half-bridge submodule of each driving signal feeder, and the PI parameter of control loop is adjusted, be allowed to
Normal output.
A kind of DC/DC converter modulator approach based on MMC proposed by the present invention is a kind of not depend on transformer voltage ratio
Modulation strategy.Using the modulation strategy, voltage change ratio can be changed with the on-off of each bridge arm module in flexible modulation topology.It hands at this time
Convertor transformer only has the effect of electrical isolation, when system is of less demanding to electrical isolation, can be omitted using the modulation strategy
AC transformer.Simulation result is as shown in attached drawing 6 and Fig. 7, referring to Fig. 6, system can achieve setting voltage in 0.1s.Please
Refering to Fig. 7,4 curves as shown in the figure are the voltage curve of four modules of the one of bridge arm of device, by this patent algorithm
Afterwards, each module voltage stabilization fluctuates near mean value, i.e., each module capacitance electric voltage equalization.
Claims (4)
1. a kind of modulator approach of the dcdc converter based on MMC, the converter primary side and secondary side have respectively included intersection
Four bridge arms, every a pair of cross bridge arm conducting modulus it is identical, it is characterised in that: the following steps are included:
(1) output voltage grade according to demand calculates the voltage ratio of output with input, is determined respectively according to the voltage ratio
The modulus s and m of primary side and the conducting of the bridge arm of secondary side every a pair of cross；
(2) two driving signals 1,2 that frequency is identical, size is opposite are issued by signal generator；
(3) two driving signals of step (2) are sent into each half-bridge submodule, the module of corresponding number is connected, adjusting controls back
The PI parameter on road is allowed to normally export.
2. a kind of modulator approach of dcdc converter based on MMC according to claim 1, it is characterised in that: in step
(2) in, the module of corresponding number is connected method particularly includes: according to the voltage of each module of acquisition, be ranked up, according to sequence
As a result the lesser several modules of turning-on voltage.
3. a kind of modulator approach of dcdc converter based on MMC according to claim 1 or 2, it is characterised in that: described
For signal generator other than issuing two driving signals 1,2 that frequency is identical, size is opposite, further also issuing has one and drive
The dynamic identical flag signal of 1 phase of signal.
4. a kind of modulator approach of dcdc converter based on MMC according to claim 3, it is characterised in that:
For the bridge arm of a pair of cross, when flag bit is 1, the smallest s module output driving waveform 1 of voltage is remaining
Under n-s module output driving waveform 2, when flag bit be 0 when, the smallest n-m module output driving waveform 1 of voltage is remaining
Under m module output driving waveform 2；
For other second for the bridge arm intersected, when flag bit is 1, the smallest m module output driving wave of voltage
Shape 1, remaining n-m module output driving waveform 2, when flag bit is 0, the smallest n-s module output driving wave of voltage
Shape 1, remaining s module output driving waveform 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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| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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- 2016-09-20 CN CN201610835165.XA patent/CN106230269B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
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| Isolated DC/DC Structure Based on Modular Multilevel Converter;Stephan Kenzelmann,et.al.;《IEEE TRANSACTIONS ON POWER ELECTRONICS》;20150131;第30卷(第1期);第89-98页 |
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