CN102522897A - Bidirectional direct-current converter with high buck-boost ratio - Google Patents
Bidirectional direct-current converter with high buck-boost ratio Download PDFInfo
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- CN102522897A CN102522897A CN2011104158059A CN201110415805A CN102522897A CN 102522897 A CN102522897 A CN 102522897A CN 2011104158059 A CN2011104158059 A CN 2011104158059A CN 201110415805 A CN201110415805 A CN 201110415805A CN 102522897 A CN102522897 A CN 102522897A
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Abstract
At present, strong extra-high voltage direct-current electric power transmission grids are built in China. Energy is needed to be stored in a storage battery and then transmitted to the grid or the storage battery is needed to be hung on the direct-current electric power transmission grid because of the randomness of power supply from new energy resources. However, a bidirectional direct-current converter has the characteristic of implementing bidirectional flow of the energy through a set of hardware, so that the bidirectional direct-current converter which is suitable for energy transmission between the high voltage electric power transmission grid and the storage battery becomes a hot topic in the research. The invention provides a bidirectional direct-current converter with high buck-boost ratio, which can be applied to high-voltage and high-power applications. Through the invention, the problem of the flow of the energy among modules after the original bidirectional converter is connected in series or parallel. The circuit of the bidirectional direct-current converter is characterized in that a main circuit is a two-stage bidirectional converter, wherein the front stage is an original-edge inversion auxiliary edge rectification type direct-current converter, and the rear stage is a BUCK-BOOST type bidirectional converter. The control mode is that each module is independently controlled so that staggered-frequency control is realized, electromagnetic interference is reduced and the voltage isolation level of drive signals is effectively lowered.
Description
Technical field
The present invention relates to a kind of two-way DC converter of the step-down ratio that rises higher, belong to the middle high power DC converter technique in the Power Conversion.
Background technology
China is vast in territory, can source distribution and electricity needs unbalanced, direct current transportation has that transmission power is big, the advantage that line loss is little is applicable to long distance power transmission, state will set up powerful extra-high voltage direct-current power delivery network still.Along with the depletion day by day and the increasing environmental pollution of non-renewable energy resources, people begin to be devoted to seek and to utilize regenerative resource new, cleaning, like wind energy, solar energy and fuel cell etc.These new forms of energy all will transmit with high-voltage direct current power grid or on direct current network, hang storage battery through the stored energy of storage battery then.In order to realize the two-way flow of energy between high-voltage direct current power grid and the storage battery, the scholar has carried out the research of a lot of two-way DC converters aspect.
At present, two-way DC converter is applied to fields such as grid-connected power generation system, electric automobile power supply system, uninterruptible power system and aircraft high-voltage direct current (DC) power system.Occasion to power transfer between high-voltage direct current power grid and the storage battery; The two-way variator of original single transformer can't satisfy the input withstand voltage and powerful requirement in high-pressure side, and to reduce the individual module high-pressure side withstand voltage and satisfy powerful requirement for the parallelly connected mode of low-pressure end must to adopt high-pressure side to connect.
Traditional bidirectional, dc conversion is under the situation of high-pressure side series connection low-pressure end parallel connection; Because the device and the control signal of each module can't be in full accord; Make that the energy Flow generation of each module is asynchronous, thereby cause the energy of transmission between module, to exist circulation to cause efficiency of transmission very low.This patent propose a kind of step-down ratio that rises higher two-way DC converter topological structure---main circuit is the two-stage type reversible transducer, prime is the bidirectional, dc transformer of former limit inversion secondary rectification, the back level is the BUCK-BOOST type reversible transducer of multitube parallel.Prime realizes the parallel connection of a plurality of module high-pressure side series connection low-pressure end, carries out cascade with back level BUCK-BOOST type reversible transducer circuit again, by back level BUCK-BOOST reversible transducer circuit control energy flow direction, realizes two-way flow.Thereby solved the problem that there is energy circulation in a plurality of parallelly connected intermodules; And the control signal of each module all is independently, has reduced the detecting element between each module, realizes wrong control frequently; Reduce electromagnetic interference; And effectively reduce the voltage isolation grade of drive signal, and improved the reliability of converter, reduced cost.
Summary of the invention
The present invention is intended on the basis of traditional two-way DC converter; Characteristics in conjunction with commutator transformer; Propose a kind of novel parallelly connected two-way DC converter topology of high-pressure side series connection low-pressure end, import high switching frequency to solve HVDC, the Power Conversion problem of low-voltage, high-current output occasion.
This inverter main circuit is characterised in that: prime is a plurality of module high-pressure side series connection of the bidirectional, dc transformer topology low-pressure end parallel connection of former limit inversion secondary rectification; Carry out cascade with back level BUCK-BOOST type two-way DC converter again, by back level BUCK-BOOST type two-way DC converter circuit control energy flow direction.The corresponding brachium pontis switching tube of the former secondary of bidirectional, dc transformer is taked fixed duty cycle control, and adopts wrong control frequently, and the former secondary control signal frequency in each intermodule and this module is all different.
This patent proposes a kind of two-way DC converter of the step-down ratio that rises higher, and the advantage of this great power bidirectional direct current variator is:
1) solved the problem that can produce circulation after the parallel connection of traditional reversible transducer high-pressure side series connection low-pressure end is made up, can adapt to high pressure input, powerful occasion through the module combinations mode at each intermodule:
2) 0.5 fixing duty ratio is all adopted in the former secondary control of commutator transformer, and control method is simple and convenient, and general control chip can be realized:
3) control signal of each module and the former secondary of inside modules all is independent given by each module controls chip; Effectively reduce the isolation Level of drive signal; Realize the wrong control frequently of each input, reduced electromagnetic interference, and reduced the detecting element signal between each module;
Description of drawings
Fig. 1 is a circuit topological structure sketch map of the present invention.
Fig. 2 is the control signal waveform of reversible transducer.
Fig. 3 is the control block diagram of reversible transducer two-way operation.
The main designation of Fig. 1---Fig. 2: (1) U
H, U
L, V
F-bus, V
F-bat, V
Con, V
Ref, V
e---be respectively high side voltage, low-pressure side voltage, DC bus-bar voltage feedback signal, battery tension feedback signal, the control signal of Control work mode switch, voltage reference signal, error signal.(2) I
L-boost, I
L-buck, I
Ref---be respectively filter inductance current feedback signal 1, filter inductance current feedback signal 2, current reference signal.(3) Q
11, Q
12, Q
13, Q
14--Q
N1, Q
N2, Q
N3, Q
N4---be respectively the high side switch pipe of two-way DC converter.(4) Q
15, Q
16, Q
17, Q
18--Q
N1, Q
N2, Q
N3, Q
N4---be respectively the low-side switch pipe of two-way DC converter.(5) Q
1, Q
1 '--Q
n, Q
N '---be respectively the switching tube of BUCK-BOOST type reversible transducer.(6) D
11-D
N8---be respectively the body diode of the former secondary-side switch pipe of two-way DC converter.(7) D
1, D
1 '--D
n, D
N '---be respectively the body diode of BUCK-BOOST type reversible transducer switching tube.(8) L---be the two-way DC converter filter inductance.(9) C
H1-C
Hn---be respectively the high-pressure side output capacitance of two-way DC converter.(10) CL---be the low-pressure side output capacitance of two-way DC converter.(11) T
1-T
n---be isolating transformer.
Embodiment
The main circuit of the two-way DC converter of the step-down ratio that rises higher is as shown in Figure 1, adopts the combining structure of a plurality of bidirectional, dc transformer module high-pressure side series connection low-pressure end parallel connection, and former secondary device of the transformer of each module and placement maintenance symmetry.Cascade is carried out with back level BUCK-BOOST type reversible transducer in the combination back.The two-way DC converter topology of this step-down ratio that rises higher comprises switching tube, diode, power transformer, output inductor, output filter capacitor.
Concrete main circuit topology is as shown in Figure 1; It is characterized in that: the main circuit prime is made up of n bidirectional, dc transformer module of same structure---No. 1 module, No. 2 modules ... The n module; The high-pressure side series connection low-pressure end parallel connection of n module, the BUCK-BOOST type reversible transducer with the back level carries out cascade again.
With No. 1 module is example.The bidirectional, dc transformer topology that No. 1 module is the rectification of a former limit inversion secondary, each module comprises eight switching tubes, eight individual diodes, an isolating transformer.Each actual switch pipe is the combination of a switching tube, individual diodes parallel connection.Below directly replace the actual switch pipe to describe with switching tube.The full-bridge topologies of this bidirectional, dc transformer adopting isolated form.Bridge-type bidirectional, dc transformer main circuit comprises full bridge inverter high-frequency isolation transformer, output full bridge rectifier.Its connected mode is: comprise four switching tubes in the full bridge inverter, switching tube Q
11With switching tube Q
12Series connection constitutes a brachium pontis, switching tube Q
13With switching tube Q
14Series connection constitutes another brachium pontis, switching tube Q
11Drain electrode and switching tube Q
13Drain electrode be connected to high-pressure side power supply U after linking to each other
HAnode, switching tube Q
12Source electrode and switching tube Q
14Source electrode be connected to high-pressure side power supply U after linking to each other
HNegative terminal, switching tube Q
11With switching tube Q
14Series connection node be connected in high-frequency isolation transformer T
1The end of the same name of former limit winding, switching tube Q
12With switching tube Q
13Series connection node be connected in high-frequency isolation transformer T
1The different name end of former limit winding, high-frequency isolation transformer T
1The secondary winding behind the output full bridge rectifier as the input voltage of late-class circuit.Also comprise four switching tubes in the full bridge rectifier, switching tube Q
15With switching tube Q
16Series connection constitutes a brachium pontis, switching tube Q
17With switching tube Q
18Series connection constitutes another brachium pontis, switching tube Q
15Drain electrode and switching tube Q
17Drain electrode be connected to the anode that low pressure is pressed the side power supply, switching tube Q after linking to each other
16Source electrode and switching tube Q
18Source electrode be connected to the negative terminal of low-pressure side power supply, switching tube Q after linking to each other
15With switching tube Q
18Series connection node be connected in high-frequency isolation transformer T
1The end of the same name of secondary winding, switching tube Q
16With switching tube Q
17Series connection node be connected in high-frequency isolation transformer T
1The different name end of secondary winding.The concrete connected mode of No. 2 module to n inside modules devices is all identical with No. 1 module, no longer very states.
BUCK-BOOST type reversible transducer with back level multitube parallel after the parallel connection of prime n module high-pressure side series connection low-pressure end carries out cascade, and back level converter comprises n switching tube, a filter inductance, an output capacitance.Its connected mode is: switching tube Q
1, Q
2Q
nDrain electrode link to each other switching tube Q with the anode of front stage circuits
1, Q
2Q
nSource electrode and switching tube Q
1 ', Q
2 'Q
N 'Drain electrode link to each other switching tube Q
1, Q
2Q
nWith receive low-pressure side power supply U after inductance L is connected
LAnode, switching tube Q
1 ', Q
2 'Q
N 'Source electrode link to each other with the anode of front stage circuits, simultaneously and voltage side power supply U
LNegative terminal link to each other.Voltage side output capacitance C
LAnode and low-pressure side power supply U
LAnode link to each other C
LNegative terminal and low-pressure side power supply U
LNegative terminal link to each other.
The two-way DC converter of the step-down ratio that rises higher that this patent proposes adopts wrong control technology frequently.Make a concrete analysis of with module 1, other module class together.Two switching tubes on the same bridge wall are like switching tube Q
11With switching tube Q
12, switching tube Q
13With switching tube Q
14All adopt same control signal, service time is the same with the turn-off time in each switch periods, and promptly duty ratio is 0.5.The switch controlled signal of two groups of the former avris of transformer different bridge walls is complementary, as like switching tube Q
11With switching tube Q
12During conducting, open and manage Q
13With switching tube Q
14Be in off state.The switching tube of two groups of the secondary side different bridge walls also is identical control strategy, and the wrong principal character of control frequently is that the cycle of the control signal of former secondary can be different, below be that example is analyzed the wrong operation mode of controlling frequently with module 1.As shown in Figure 2,0 moment switching tube Q
11With switching tube Q
12When opening, switching tube Q
13With switching tube Q
14Be in off state, two ends, the former limit of transformer are high side voltage U
H, this moment secondary-side switch pipe Q
15With switching tube Q
16Also be in opening state, the secondary output voltage is U
H/ N.t
1Moment switching tube Q
15With switching tube Q
16Turn-off switching tube Q
17With switching tube Q
18Open-minded, this moment switching tube Q
15With switching tube Q
16The body diode conducting.t
2Moment switching tube Q
11With switching tube Q
12Turn-off switching tube Q
13With switching tube Q
14Be in opening state, at this moment switching tube Q
15With switching tube Q
16Body diode bear back-pressure and turn-off, energy is through switching tube Q
17With switching tube Q
18Transmit, the secondary output voltage still is U
H/ N.t
3Moment switching tube Q
17With switching tube Q
18Turn-off switching tube Q
15With switching tube Q
16Open-minded, this moment switching tube Q
17With switching tube Q
18The body diode conducting.After this switching time similar analysis all, thus keep U
H/ N output voltage.The control signal of each module all is that independently control chip is given through each module, so the switching frequency of each module is incomplete same.
The control signal of the BUCK-BOOST type reversible transducer of back level is as shown in Figure 2, when being in the BUCK pattern, and switching tube Q
1, Q
2Q
nBe main switch, switching tube Q
1 ', Q
2 'Q
N 'Do not give drive signal, be in off state, switching tube Q
1 ', Q
2 'Q
N 'Body diode D
1 ', D
2 'D
N 'As fly-wheel diode work.When being in the BOOST pattern, switching tube Q
1 ', Q
2 'Q
N 'Be main switch, switching tube Q
1, Q
2Q
nDo not give drive signal, be in off state, switching tube Q
1, Q
2Q
nBody diode D
1, D
2D
nDiode operation as the BOOST circuit.Thereby realize the two-way flow of energy.
The adjuster commutation circuit is made up of two-way alternative analog switch, a voltage regulator, a current regulator, and is as shown in Figure 3.Its operation principle is: with DC bus-bar voltage feedback signal V
F-busWith battery tension feedback signal V
F-batDeliver to the x and the y passage of an alternative analog switch respectively, with filter inductance current feedback signal 1I
L-boostWith filter inductance current feedback signal 2I
L-buckDeliver to the x and the y passage of another alternative analog switch respectively, the control signal V that the enable signal of alternative analog switch is switched by control change device mode of operation equally
ConProvide.Error signal V
eDeliver to the in-phase end EA+ of controller internal error amplifier, behind voltage follow, cut, to reach the purpose of regulation voltage or electric current with the friendship of RAMP signal.
As control signal V
ConDuring for low level, converter is operated in the BOOST pattern, filter inductance electric current forward flow.At this moment, two-way alternative analog switch is all selected x passage, V
F-busAnd I
L-boostDeliver to the end of oppisite phase of voltage regulator and current regulator respectively.In order to let converter be operated in Boost voltage stabilizing pattern, the IL-boost that actual detected is come when stable state perseverance less than current reference signal I
Ref, cause current regulator saturated, and the voltage regulator operate as normal, so voltage regulator output is lower than current regulator output during stable state, voltage regulator output is given controller and is handed over the RAMP signal and cut the voltage stabilizing of control output signal magnitude realization dc bus.
As control signal V
ConDuring for high level, converter is operated in the BUCK pattern, the filter inductance reverse direction current flow.At this moment, two-way alternative analog switch is all selected y passage, V
F-batAnd I
L-buckDeliver to the end of oppisite phase of voltage regulator and current regulator respectively.In order to let converter be operated in the Buck current-limit mode, the V that actual detected is come
F-batPerseverance is less than voltage reference signal V when stable state
RefCause voltage regulator saturated, and the current regulator operate as normal, so current regulator output has been lower than voltage regulator output during stable state; Controller is given in current regulator output and the friendship of RAMP signal cuts, and the size of control output signal realizes the storage battery constant current charge.
Voltage regulator and the current regulator time-sharing work under two kinds of mode of operations has been realized taking over seamlessly between BUCK, two kinds of patterns of BOOST.
Claims (2)
1. the two-way DC converter of the step-down ratio that rises higher, main circuit is the two-stage type reversible transducer, and prime is the parallel connections of a plurality of bidirectional, dc transformer module high-pressure sides series connection low-pressure ends, and the back level is the BUCK-BOOST type reversible transducer of multitube parallel.Principal character is a plurality of module high-pressure sides series connection of the bidirectional, dc transformer topology realization low-pressure ends parallel connection to prime; Carry out cascade with back level BUCK-BOOST reversible transducer circuit again; By back level BUCK-BOOST type reversible transducer circuit control energy flow direction, realize two-way flow.
2. the mode of fixed duty cycle is taked in the control of the former secondary of bidirectional, dc transformer, and the switch controlled signal on the same brachium pontis is complementary.Each module is independently control all, and drive signal is given separately by each module controls chip, and the control signal frequency of the former secondary-side switch pipe in each intermodule and this module all difference is a kind of wrong control mode frequently.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104158059A CN102522897A (en) | 2011-12-14 | 2011-12-14 | Bidirectional direct-current converter with high buck-boost ratio |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104158059A CN102522897A (en) | 2011-12-14 | 2011-12-14 | Bidirectional direct-current converter with high buck-boost ratio |
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| CN102522897A true CN102522897A (en) | 2012-06-27 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769382A (en) * | 2012-07-19 | 2012-11-07 | 上海交通大学 | Radial direct current micro grid |
| CN103280984A (en) * | 2013-01-15 | 2013-09-04 | 中国矿业大学(北京) | Cascade connection type current transformer based on single-stage power transformation module |
| CN103973153A (en) * | 2013-02-05 | 2014-08-06 | 新疆大学 | High-power numerical control pulse frequency modulation power supply of electric arc cutting machine tool |
| CN104578803A (en) * | 2015-02-04 | 2015-04-29 | 荣信电力电子股份有限公司 | High-voltage direct current-direct current power electronic transformer |
| CN105610325A (en) * | 2016-01-28 | 2016-05-25 | 中国电力科学研究院 | Modular multilevel converter for middle-high voltage direct-current grid connection of high-power sodium-sulfur battery |
| CN105751915A (en) * | 2016-05-16 | 2016-07-13 | 蒋小春 | Photovoltaic energy storage direct current quick charging pile |
| CN107147104A (en) * | 2017-07-25 | 2017-09-08 | 上海交通大学 | The voltage pulsation recovery device and restoration methods of a kind of direct-flow distribution system |
| CN109309450A (en) * | 2017-07-28 | 2019-02-05 | 北京德意新能电气有限公司 | A kind of two-way DC/DC converter of the non-isolation type of high step-up ratio |
| CN111033929A (en) * | 2017-08-14 | 2020-04-17 | 日产自动车株式会社 | Power control system |
| CN112260543A (en) * | 2020-09-19 | 2021-01-22 | 许继电源有限公司 | High-gain high-frequency isolation bidirectional cascade DC/DC converter and control method thereof |
| CN113541490A (en) * | 2021-07-02 | 2021-10-22 | 中国北方车辆研究所 | Interleaved bidirectional Buck/Boost circuit soft switch PWM-PFM control system and control method |
| CN116207984A (en) * | 2023-04-28 | 2023-06-02 | 深圳市恒运昌真空技术有限公司 | Bidirectional DC-DC conversion circuit, method and device |
| CN117543779A (en) * | 2024-01-09 | 2024-02-09 | 云南丁旺科技有限公司 | Direct current bidirectional charging module and charging pile |
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| CN100353654C (en) * | 2003-11-19 | 2007-12-05 | 南京航空航天大学 | Cascading bidirectional DC-DC converter |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769382A (en) * | 2012-07-19 | 2012-11-07 | 上海交通大学 | Radial direct current micro grid |
| CN103280984A (en) * | 2013-01-15 | 2013-09-04 | 中国矿业大学(北京) | Cascade connection type current transformer based on single-stage power transformation module |
| CN103280984B (en) * | 2013-01-15 | 2017-03-15 | 中国矿业大学(北京) | Cascade connection type current transformer based on single-stage power conversion module |
| CN103973153A (en) * | 2013-02-05 | 2014-08-06 | 新疆大学 | High-power numerical control pulse frequency modulation power supply of electric arc cutting machine tool |
| CN104578803A (en) * | 2015-02-04 | 2015-04-29 | 荣信电力电子股份有限公司 | High-voltage direct current-direct current power electronic transformer |
| CN105610325A (en) * | 2016-01-28 | 2016-05-25 | 中国电力科学研究院 | Modular multilevel converter for middle-high voltage direct-current grid connection of high-power sodium-sulfur battery |
| CN105751915A (en) * | 2016-05-16 | 2016-07-13 | 蒋小春 | Photovoltaic energy storage direct current quick charging pile |
| CN107147104A (en) * | 2017-07-25 | 2017-09-08 | 上海交通大学 | The voltage pulsation recovery device and restoration methods of a kind of direct-flow distribution system |
| CN109309450A (en) * | 2017-07-28 | 2019-02-05 | 北京德意新能电气有限公司 | A kind of two-way DC/DC converter of the non-isolation type of high step-up ratio |
| CN111033929A (en) * | 2017-08-14 | 2020-04-17 | 日产自动车株式会社 | Power control system |
| CN112260543A (en) * | 2020-09-19 | 2021-01-22 | 许继电源有限公司 | High-gain high-frequency isolation bidirectional cascade DC/DC converter and control method thereof |
| CN112260543B (en) * | 2020-09-19 | 2022-06-24 | 许继电源有限公司 | High-gain high-frequency isolation bidirectional cascade DC/DC converter and control method thereof |
| CN113541490A (en) * | 2021-07-02 | 2021-10-22 | 中国北方车辆研究所 | Interleaved bidirectional Buck/Boost circuit soft switch PWM-PFM control system and control method |
| CN113541490B (en) * | 2021-07-02 | 2023-07-14 | 中国北方车辆研究所 | Staggered bidirectional Buck/Boost circuit soft switch PWM-PFM control system and control method |
| CN116207984A (en) * | 2023-04-28 | 2023-06-02 | 深圳市恒运昌真空技术有限公司 | Bidirectional DC-DC conversion circuit, method and device |
| CN116207984B (en) * | 2023-04-28 | 2023-07-28 | 深圳市恒运昌真空技术有限公司 | Bidirectional DC-DC conversion circuit, method and device |
| CN117543779A (en) * | 2024-01-09 | 2024-02-09 | 云南丁旺科技有限公司 | Direct current bidirectional charging module and charging pile |
| CN117543779B (en) * | 2024-01-09 | 2024-04-12 | 云南丁旺科技有限公司 | Direct current bidirectional charging module and charging pile |
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Application publication date: 20120627 |