CN105978332B - Tetra- level Boost converter of IPOS and its neutral-point-potential balance control - Google Patents
Tetra- level Boost converter of IPOS and its neutral-point-potential balance control Download PDFInfo
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- CN105978332B CN105978332B CN201610318249.6A CN201610318249A CN105978332B CN 105978332 B CN105978332 B CN 105978332B CN 201610318249 A CN201610318249 A CN 201610318249A CN 105978332 B CN105978332 B CN 105978332B
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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Abstract
The present invention discloses a kind of tetra- level Boost converter of IPOS and its neutral-point-potential balance control.Device part includes the interlaced 120 ° of modulation of switching tube S1, S2, S3.Tetra- level Boost converter of IPOS can be regarded as three Boost input-series and output-parallels by the angle series-parallel from modularization.Striding capacitance Cf1 and diode D2 Component units IV, striding capacitance Cf2 and diode D4 Component units V.Under staggeredly 120 ° of modulation strategies, each switching tube of tetra- level Boost converter of IPOS and the switch state of diode.Based on above-mentioned apparatus, the present invention also proposes a kind of three close-loop control strategy being made of a common voltage outer ring, three current inner loops and two grading rings.Grading ring is put into before current inner loop, the current-order of current inner loop is exported together with outer voltage, current inner loop uses proportional controller.
Description
Technical field
The present invention relates to high voltage power transmission fields.
Background technique
In recent years, in order to meet the power supply occasion that input voltage is low, output voltage is high, people increasingly pay attention to input
The research of series and output-parallel (Input-Parallel-Output-Series, IPOS) combined converter.It combines and becomes in IPOS
In parallel operation, the input of each DC/DC converter module is connected in parallel, and output is cascaded, electric to improve output end with this
Press grade.Since the input of modules is in parallel, so only to undertake IPOS combined converter always defeated for the input current of modules
Enter a part of electric current, thus the current stress of modules substantially reduces, the transfer efficiency of entire IPOS combined converter is big
It is big to improve.Meanwhile IPOS combined converter also has redundancy properties, it, only need to be by failure when one of module breaks down
The input short of module can guarantee the normal operation of entire converter.By the end of currently, IPOS combined converter be all by every
The rarely seen report of combined converter that release DC/DC converter module is composed, and is made of non-isolation type DC/DC converter
Road.In addition, IPOS combined converter, which there are the unbalanced problem of output capacitance voltage, is be easy to cause, undertakes the high module damage of voltage
It is bad.Therefore, IPOS combined converter is needed that certain balance control strategy is taken to realize neutral-point potential balance.
Summary of the invention
An object of the present invention is to provide a kind of tetra- level Boost converter circuit topology of IPOS.
To realize the present invention purpose and the technical solution adopted is that a kind of such, tetra- level Boost converter of IPOS, electricity
The source electrode of the cathode in source connection switch pipe S1, switching tube S2 and switching tube S3 simultaneously.
The anode of the drain electrode connection diode D1 of switching tube S3, the anode of the cathode connection diode D2 of diode D1, two
The anode of the cathode connection diode D3 of pole pipe D2, the anode of the cathode connection diode D4 of diode D3, diode D4's is negative
The anode of pole connection diode D5.
After the cathode of diode D5 is sequentially connected in series capacitor C3, capacitor C2 and capacitor C1, it is connected to the source electrode of switching tube S1.
The both ends of load R are separately connected the cathode of diode D5 and the source electrode of switching tube S1.
The anode of power supply is divided into three tunnels: after first via series inductance L1, being connected to the drain electrode of switching tube S1.Second tunnel is successively
After series inductance L2 and capacitor Cf1, it is connected to the cathode of diode D2.After third road is sequentially connected in series inductance L3 and capacitor Cf2, even
It is connected to the cathode of diode D4.
Another object of the present invention is to provide a kind of midpoint based on above-mentioned tetra- level Boost converter circuit of IPOS
Potential balance control method: including being adjusted by common voltage outer ring adjuster, two grading ring adjusters and three current inner loops
The three close-loop control system that device is constituted.
The on-off of switching tube S1 and diode D1 determine I duty ratio d of Boost1,
The on-off of switching tube S2 and diode D3 determine II duty ratio d of Boost2,
The on-off of switching tube S3 and diode D5 determine III duty ratio d of Boost3,
Acquire the split capacitor voltage U of capacitor C1, capacitor C2 and capacitor C3o1、Uo2、Uo3, output voltage instruction Uo* with Uo1、
Uo2、Uo3It is poor that the sum of three makees, and obtains common reference electric current I by outer voltage adjusterL。
Output voltage instructs Uo* one third respectively with Uo1、Uo3It is poor to make, and is missed after respective pressure adjuster
Poor reference current Δ IL1、ΔIL3。
According toRealize the solution between outer voltage and grading ring
Coupling, three obtained inductive current instruct IL1*、IL2*、IL3*。
IL1*、IL2*、IL3* respectively with corresponding inductive current IL1、IL2、IL3It makes comparisons, using respective current inner loop
Adjuster obtains the duty ratio d of three Boosts1、d2、d3:
Generate three carrier signal Ca1、Ca2And Ca3, 120 ° of phase phase difference, d1With Ca1Switching tube S1 is obtained after being compared
Driving signal, d2With Ca2The driving signal of switching tube S2 is obtained after being compared.d3With Ca3Switching tube is obtained after being compared
The driving signal of S3.It is worth noting that further, working as d1Greater than Ca1When, high level is exported, d is worked as1Less than Ca1When, output
Low level.Work as d2Greater than Ca2When, high level is exported, d is worked as2Less than Ca2When, export low level.Work as d3Greater than Ca3When, export high electricity
It is flat, work as d3Less than Ca3When, export low level.
Detailed description of the invention
Fig. 1 is tetra- level Boost converter of IPOS.
Fig. 2~9 are the equivalent circuit in tetra- level Boost converter of IPOS each stage.
Figure 10 is the three close-loop control strategy of tetra- level Boost converter of IPOS.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention only
It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used
With means, various replacements and change are made, should all include within the scope of the present invention.
Embodiment 1:
Referring to Fig. 1, a kind of tetra- level Boost converter circuit topology of IPOS.The cathode while connection switch pipe S1 of power supply,
The source electrode of switching tube S2 and switching tube S3.The anode of the drain electrode connection diode D1 of switching tube S3, the cathode connection of diode D1
The anode of diode D2, the anode of the cathode connection diode D3 of diode D2, the cathode connection diode D4's of diode D3
Anode, the anode of the cathode connection diode D5 of diode D4.The cathode of diode D5 is sequentially connected in series capacitor C3, capacitor C2 and electricity
After holding C1, it is connected to the source electrode of switching tube S1.The both ends of load R are separately connected the cathode of diode D5 and the source of switching tube S1
Pole.The anode of power supply is divided into three tunnels: after first via series inductance L1, being connected to the drain electrode of switching tube S1.Second tunnel is sequentially connected in series
After inductance L2 and capacitor Cf1, it is connected to the cathode of diode D2.After third road is sequentially connected in series inductance L3 and capacitor Cf2, it is connected to
The cathode of diode D4.
It is worth noting that the interlaced 120 ° of modulation of switching tube S1, S2, S3.The angle series-parallel from modularization can incite somebody to action
Tetra- level Boost converter of IPOS regards three Boost input-series and output-parallels as.Wherein, first Boost by
L1, S1, D1, C1 composition, are denoted as Boost I.Second Boost is made of L2, S2, D3, C2, is denoted as Boost II.
Third Boost is made of L2, S2, D5, C3, is denoted as Boost III.Striding capacitance Cf1 and diode D2 constitutes single
First IV, striding capacitance Cf2 and diode D4 Component units V.Temporary location of the unit IV as Boost I and Boost II, it is real
The input-series and output-parallel of the two Boost modules is showed.Unit V is as in Boost II and Boost III
Between unit, realize the input-series and output-parallel of the two Boost modules.Therefore, because unit IV and unit V
In the presence of so that Boost I, Boost II and tri- module input-series and output-parallels of Boost III, improve entire converter
Boost capability.
Under staggeredly 120 ° of modulation strategies, each switching tube of tetra- level Boost converter of IPOS and the switch of diode
State is as shown in table 1, and equivalent circuit is as shown in Figure 2.According to the difference of duty ratio d, by the work of tetra- level Boost converter of IPOS
It is divided into three kinds of situations as state:
1. tetra- level Boost converter of IPOS works in stage I, II, III, IV as 0≤d≤1/3.
2. tetra- level Boost converter of IPOS works in stage I, II, III, V, VI, VII as 1/3≤d≤2/3.
3. tetra- level Boost converter of IPOS works in stage V, VI, VII, VIII as 2/3≤d≤1.
In tetra- level Boost converter of IPOS, output voltage and capacitance voltage size are respectively as follows:
Striding capacitance Cf1Voltage stress and striding capacitance Cf2Voltage stress size are as follows:
Switching tube is identical with the voltage stress size of diode, are as follows:
Input current ripple size are as follows:
1 switch state of table
Embodiment 2
In order to realize the rigorous equilibrium control of midpoint potential, this patent discloses a kind of three close-loop control strategy.More specifically,
It include the three close-loop control system that common voltage outer ring adjuster, two grading ring adjusters and three current inner loop adjusters are constituted
System.The on-off of switching tube S1 and diode D1 determine I duty ratio d of Boost1, the on-off decision of switching tube S2 and diode D3
II duty ratio d of Boost2, the on-off decision III duty ratio d of Boost of switching tube S3 and diode D53。
Acquire the split capacitor voltage U of capacitor C1, capacitor C2 and capacitor C3o1、Uo2、Uo3, output voltage instruction Uo* with Uo1、
Uo2、Uo3It is poor that the sum of three makees, and obtains common reference electric current I by outer voltage adjusterL。
Output voltage instructs Uo* one third respectively with Uo1、Uo3It is poor to make, and is missed after respective pressure adjuster
Poor reference current Δ IL1、ΔIL3。
According toRealize the solution between outer voltage and grading ring
Coupling, three obtained inductive current instruct IL1*、IL2*、IL3*。
IL1*、IL2*、IL3* respectively with corresponding inductive current IL1、IL2、IL3It is poor to make, using respective current inner loop tune
Section device obtains the duty ratio d of three Boosts1、d2、d3。
The derivation process of above-mentioned control method is as follows:
In tetra- level Boost converter of IPOS, inputs inductive current and exports the size relation between electric current are as follows:
Wherein, duty ratio d1、d2、d3All consist of two parts, may be expressed as:
Wherein, d is public duty ratio, Δ d1、Δd2、Δd3Respectively indicate Boost I, Boost II, Boost III
Press duty ratio.(8) and (9) substitution (7) can be obtained to the expression formula of three Boost module output current variable quantities are as follows:
In the case where output voltage is not disturbed, Δ IoSize is 0, so that (10) can simplify are as follows:
When tetra- level Boost converter of IPOS enters steady-working state, the public duty ratio d and public affairs of three switching tubes
Common-battery inducing current ILConstant magnitude.Thus pass through the variation delta I of inductive currentL1、ΔIL2、ΔIL3It can reflect Δ d indirectly1、
Δd2、Δd3Size.Three equatioies in (11) are added:
In three close-loop control strategy, there is the relationship, i.e. the output meeting of outer voltage of intercoupling in outer voltage and grading ring
The balance control of midpoint potential is influenced, and the output of grading ring will affect the burning voltage output of the converter.In order to realize
Decoupling control between outer voltage and grading ring, it is necessary to so that Δ d1、Δd2、Δd3The sum of be equal to 0 so that three electricity
The variation delta I of inducing currentL1、ΔIL2、ΔIL3The sum of be equal to 0, it may be assumed that
ΔIL1+ΔIL2+ΔIL3=0 (13)
(13) deformation can be obtained:
ΔIL2=-Δ IL1-ΔIL3 (14)
The reference current that three Boost modules can be obtained based on (14) is respectively as follows:
The decoupling between outer voltage and grading ring is realized according to (15), and three obtained inductive current instructs IL1*、
IL2*、IL3*, respectively with corresponding inductive current IL1、IL2、IL3It makes comparisons, obtains three using respective current inner loop adjuster
The duty ratio of a Boost, it may be assumed that
In conjunction with (15) and (16), this patent proposes three close-loop control strategy as shown in Figure 10, by a common voltage outside
Ring, three current inner loops and two grading rings are constituted.Grading ring is put into before current inner loop, is exported together with outer voltage
The current-order of current inner loop, current inner loop use proportional controller.
The three close-loop control strategy according to shown in 10, the neutral-point-potential balance control principle of tetra- level Boost converter of IPOS
Are as follows: work as Uo1Greater than 1/3Uo* Uo3Less than 1/3UoWhen *, Δ IL1It is negative and Δ IL3It is positive, thus IL1 *Reduce and IL3 *Increase, makes
Obtain d1Reduce and d3Increase, thus Uo1Reduce and Uo3Increase, forms a negative-feedback.In addition, if Δ IL1Absolute value be greater than
ΔIL3, then IL2 *Increase, so that d2Increase.After several switch periods, U is realizedo1、Uo2、Uo3Equilibrium, i.e. midpoint potential are flat
Weighing apparatus.Similarly, under other different conditions, U also may be implementedo1、Uo2、Uo3Electric voltage equalization.
Claims (2)
1. a kind of tetra- level Boost converter of IPOS, it is characterised in that:
The source electrode of the cathode of power supply connection switch pipe S1, switching tube S2 and switching tube S3 simultaneously；
The anode of the drain electrode connection diode D1 of switching tube S1, the anode of the cathode connection diode D2 of diode D1, diode
The anode of the cathode connection diode D3 of D2, the anode of the cathode connection diode D4 of diode D3, the cathode of diode D4 connect
Connect the anode of diode D5；
After the cathode of diode D5 is sequentially connected in series capacitor C3, capacitor C2 and capacitor C1, it is connected to the source electrode of switching tube S1；
The both ends of load R are separately connected the cathode of diode D5 and the source electrode of switching tube S1；
The anode of power supply is divided into three tunnels: after first via series inductance L1, being connected to the drain electrode of switching tube S1；Second tunnel is sequentially connected in series
After inductance L2 and capacitor Cf1, it is connected to the cathode of diode D2；After third road is sequentially connected in series inductance L3 and capacitor Cf2, it is connected to
The cathode of diode D4.
2. a kind of neutral-point potential balance control method based on converter described in claim 1, it is characterised in that:
Including the tricyclic control being made of common voltage outer ring adjuster, two grading ring adjusters and three current inner loop adjusters
System processed；
The on-off of switching tube S1 and diode D1 determine I duty ratio d of Boost1,
The on-off of switching tube S2 and diode D3 determine II duty ratio d of Boost2,
The on-off of switching tube S3 and diode D5 determine III duty ratio d of Boost3,
Acquire the split capacitor voltage U of capacitor C1, capacitor C2 and capacitor C3o1、Uo2、Uo3, output voltage instruction Uo* with Uo1、Uo2、
Uo3It is poor that the sum of three makees, and obtains common reference electric current I by outer voltage adjusterL；
Output voltage instructs Uo* one third respectively with Uo1、Uo3It is poor to make, and obtains pressure ginseng after respective pressure adjuster
Examine electric current Δ IL1、ΔIL3；
According toIt realizes the decoupling between outer voltage and grading ring, obtains
Three inductive currents instruct IL1*、IL2*、IL3*；
IL1*、IL2*、IL3* respectively with corresponding inductive current IL1、IL2、IL3It is poor to make, using respective current inner loop adjuster
Obtain the duty ratio d of three Boosts1、d2、d3:
Wherein, d is public duty ratio, Δ d1Indicate the pressure of Boost I
Duty ratio；Δd2Respectively indicate the pressure duty ratio of Boost II；Δd3Indicate the pressure duty ratio of Boost III.
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| CN106549577B (en) * | 2016-12-08 | 2019-04-02 | 北京理工大学 | Non-isolated two-way high-gain DC/DC converter and method for controlling frequency conversion |
| CN107257206B (en) * | 2017-05-15 | 2020-01-07 | 上海交通大学 | Three-terminal direct current transformer |
| CN107579660A (en) * | 2017-09-19 | 2018-01-12 | 南方电网科学研究院有限责任公司 | The output control method and device of DC converter |
| CN109617408B (en) * | 2018-12-24 | 2019-11-26 | 北京交通大学 | Based on the capacitor-clamped super high-gain boost converter of three-phase crisscross parallel |
| CN110045170B (en) * | 2019-04-01 | 2021-06-22 | 漳州科华技术有限责任公司 | Method, system and device for detecting inductive current of step-up/step-down circuit |
| CN110838792B (en) * | 2019-11-08 | 2020-09-04 | 中国船舶重工集团公司第七一九研究所 | IPOS direct current converter self-adaptive variable parameter output voltage-sharing control method |
| CN111342688B (en) * | 2019-12-20 | 2021-04-20 | 樊蓉 | Four-level converter voltage balance modulation method |
| CN112234825A (en) * | 2020-11-02 | 2021-01-15 | 合肥科威尔电源系统股份有限公司 | Voltage-sharing control circuit and control method thereof |
| CN113691132B (en) * | 2021-08-20 | 2023-03-14 | 电子科技大学 | Voltage balance three-state double-output boost converter and control method thereof |
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