CN104038056A - Dual-input BUCK direct current converter and control system of dual-input BUCK direct current converter - Google Patents
Dual-input BUCK direct current converter and control system of dual-input BUCK direct current converter Download PDFInfo
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Abstract
The invention discloses a dual-input BUCK direct current converter and a control system of the dual-input BUCK direct current converter, and belongs to the field of a power electronic converter. The dual-input BUCK direct current converter comprises two BUCK pulsed voltage source units, an additional circuit and an output filter circuit, wherein each BUCK pulsed voltage source unit comprises a direct current voltage source V1 (V2), a power transistor S1 (S2) and a fly-wheel diode D1 (D2); the additional circuit comprises a power transistor S3 and a fly-wheel diode D3; and the output filter circuit comprises an output filter inductor L and an output filter capacitor c. The control system of the dual-input BUCK direct current converter is in charge of carrying out power budget on two input direct current voltage sources and stable control on load voltage. The dual-input BUCK direct current converter has the advantages that the weight is light; the size is small; the cost is low; the loss is little; the efficiency of the circuit is high; ripples in the output voltage waveforms are small; and a transformer does not need to be isolated, and the like.
Description
Technical field
The present invention relates to converters field, especially a kind of DC converter and control system thereof of dual input BUCK structure.
Background technology
Along with becoming increasingly conspicuous of environmental protection problem, people more and more pay attention to the exploitation of regenerative resource.Regenerative resource has the features such as cheapness, reliable, cleanliness without any pollution, energy abundance, so renewable energy power generation has represented good market prospects.At present, apply more renewable energy power generation form and have photovoltaic generation, fuel cell-powered, wind power generation, water generating, geothermal power generation etc., but these forms of electricity generation all exist supply of electric power unstable, discontinuous, with features such as weather conditions variations, therefore need to adopt various energy resources to combine the distributed power supply system of power supply.
In traditional new forms of energy associating electric power system, every kind of energy form needs a DC/DC converter conventionally, and the various energy is become to direct current output, is connected in parallel on public DC bus, supply with DC load, but its structure is more complicated, and cost is higher.In order to simplify circuit structure, reduce system cost, can replace a plurality of single input direct-current converters with a multi-input direct current converter (Multiple-Input Converter, MIC).MIC allows various energy resources input, and the character of input source, amplitude and characteristic can be identical, also can difference very large, multiple input sources can power to the load respectively or simultaneously, therefore the stability and the flexibility that have improved system, realize the optimization utilization of the energy, and reduce system cost.
Summary of the invention
The object of this invention is to provide that a kind of topological structure is simple, control method is simple and can realizes dual input BUCK DC converter and the control system thereof that energy distributes utilization automatically.
In order to solve the technical problem of above-mentioned existence, the present invention is achieved by the following technical solutions:
DC converter of the present invention is connected to form by a BUCK type pulse voltage source unit, the 2nd BUCK type pulse voltage source unit, adjunct circuit and output filter circuit;
A described BUCK type pulse voltage source unit is by the first input dc power potential source A, the first power switch tube S
1with the first sustained diode
1form; The positive pole of the first input dc power potential source A and the first power switch tube S
1drain electrode connect, the first power switch tube S
1source electrode and the first sustained diode
1negative electrode connect, the first sustained diode
1anode be connected with the negative pole of the first input dc power potential source A, form a BUCK type pulse voltage source unit;
Described the 2nd BUCK type pulse voltage source unit is by the second input dc power potential source B, the second power switch tube S
2with the second sustained diode
2form; The positive pole of the second input dc power potential source B and the second power switch tube S
2drain electrode connect, the second power switch tube S
2source electrode and the second sustained diode
2negative electrode connect, the second sustained diode
2anode be connected with the negative pole of the second input dc power potential source B, form the 2nd BUCK type pulse voltage source unit;
Described adjunct circuit comprises the 3rd power switch tube S
3with the 3rd sustained diode
3, the 3rd sustained diode
3anode and the 3rd power switch tube S
3drain electrode connect, the 3rd sustained diode
3negative electrode and the 2nd BUCK type pulse voltage source unit in anodal and the second power switch tube S of the second input dc power potential source B
2drain electrode connect; The first power switch tube S in the one BUCK type pulse voltage source unit
1source electrode and the 2nd BUCK type pulse voltage source unit in negative pole and the second sustained diode of the second input dc power potential source B
2anode connect respectively;
Described output filter circuit comprises output inductor L and output filter capacitor c; The second power switch tube S in one end of output inductor L and the 2nd BUCK type pulse voltage source unit
2source electrode and the second sustained diode
2negative electrode connect respectively, the 3rd power switch tube S in the output inductor L other end and adjunct circuit
3drain electrode and the 3rd sustained diode
3anode connect respectively;
The 3rd power switch tube S in one end of output filter capacitor c and adjunct circuit
3source electrode and one end of load R connect respectively, negative pole and the first sustained diode of the first input dc power potential source A in the output filter capacitor c other end and a BUCK type pulse voltage source unit
1anode, the other end of load R connect respectively.
The present invention also provides a kind of control system of dual input BUCK DC converter, wherein the first input dc power potential source A is photovoltaic cell, the second input dc power potential source B is storage battery, and two BUCK type pulse voltage source units are carried out to power division and the stable control of load voltage; The first input dc power potential source A inputs with maximum power, by maximal power tracing algorithm, keeps maximum power to input; The second input dc power potential source B, as power buffer cell, carries out energy by pi regulator and automatically distributes;
When load R demand power is greater than the power that the first input dc power potential source A provides, the second input dc power potential source B electric discharge, adjuster be output as on the occasion of, be converted into the second power switch tube S
2duty ratio, control the discharge power of the second input dc power potential source B;
When load R demand power is less than the power that the first input dc power potential source A provides, the second input dc power potential source B charging, adjuster is output as negative value, is converted into the 3rd power switch tube S
3duty ratio, control the charge power of the second input dc power potential source B, maintain load voltage stable.
Compared with the prior art, beneficial effect of the present invention is:
1, lightweight, volume is little, cost is low, loss is little;
2, the ripple in output voltage waveforms is little, and does not need isolating transformer;
3, adopt the input of two-way energy, make full use of new forms of energy, realize energy-optimised utilization;
4, can single-stage power conversion between each port, the energy that avoids waste, effectively raises the efficiency;
5, can expanded application, conveniently realize modularization.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of dual input BUCK DC converter of the present invention;
Fig. 2 is control system structured flowchart of the present invention;
Fig. 3 is that the present invention powers at A, B simultaneously, the principle oscillogram under C power consumption pattern;
Fig. 3 (a) is that converter work schedule is the principle oscillogram of I-II-IV;
Fig. 3 (b) is that converter work schedule is the principle oscillogram of I-III-IV;
Fig. 4 is that the present invention powers at A, B simultaneously, each equivalent switch mode figure under C power consumption pattern;
Fig. 5 is the principle oscillogram of the present invention under A power supply, B energy storage, C power consumption pattern;
Fig. 6 is the present invention each equivalent switch mode figure under A power supply, B energy storage, C power consumption pattern;
Fig. 7 is that in the present invention, A does not work, B is independently-powered, the principle oscillogram under C power consumption pattern;
Fig. 8 is that in the present invention, A does not work, B is independently-powered, each equivalent switch mode figure under C power consumption pattern;
Fig. 9 is N input BUCK DC converter electrical schematic diagram.
Drawing reference numeral: A-the first input dc power potential source, B-the second input dc power potential source, C-load R, V
1the input voltage of the-the first input dc power potential source, V
2the input voltage of the-the second input dc power potential source, S
1the-the first power switch pipe, S
2the-the second power switch pipe, S
3the-the three power switch pipe, D
1the-the first fly-wheel diode, D
2the-the second fly-wheel diode, D
3the-the three fly-wheel diode, L-output inductor, c-output filter capacitor, V
gS1the-the first power switch tube drives voltage V
gS2the-the second power switch tube drives voltage, V
gS3the-the three power switch tube drives voltage, i
l-inductive current, i
s1the-the first power switch tube current, i
s2the-the second power switch tube current, i
s3the-the three power switch tube current, i
d1the-the first fly-wheel diode electric current, i
d2the-the second fly-wheel diode electric current, i
d3the-the three fly-wheel diode electric current, d
1the duty ratio of the-the first power switch pipe, d
2the duty ratio of the-the second power switch pipe, d
3the duty ratio of the-the three power switch pipe, V
o-output voltage.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail
In the electrical schematic diagram of the BUCK of dual input shown in Fig. 1 DC converter, DC converter of the present invention is connected to form by a BUCK type pulse voltage source unit, the 2nd BUCK type pulse voltage source unit, adjunct circuit and output filter circuit;
A described BUCK type pulse voltage source unit is by the first input dc power potential source A, the first power switch tube S
1with the first sustained diode
1form; The positive pole of the first input dc power potential source A and the first power switch tube S
1drain electrode connect, the first power switch tube S
1source electrode and the first sustained diode
1negative electrode connect, the first sustained diode
1anode be connected with the negative pole of the first input dc power potential source A, form a BUCK type pulse voltage source unit;
Described the 2nd BUCK type pulse voltage source unit is by the second input dc power potential source B, the second power switch tube S
2with the second sustained diode
2form; The positive pole of the second input dc power potential source B and the second power switch tube S
2drain electrode connect, the second power switch tube S
2source electrode and the second sustained diode
2negative electrode connect, the second sustained diode
2anode be connected with the negative pole of the second input dc power potential source B, form the 2nd BUCK type pulse voltage source unit;
Described adjunct circuit comprises the 3rd power switch tube S
3with the 3rd sustained diode
3, the 3rd sustained diode
3anode and the 3rd power switch tube S
3drain electrode connect, the 3rd sustained diode
3negative electrode and the 2nd BUCK type pulse voltage source unit in anodal and the second power switch tube S of the second input dc power potential source B
2drain electrode connect; The first power switch tube S in the one BUCK type pulse voltage source unit
1source electrode and the 2nd BUCK type pulse voltage source unit in negative pole and the second sustained diode of the second input dc power potential source B
2anode connect respectively;
Described output filter circuit comprises output inductor L and output filter capacitor c; The second power switch tube S in one end of output inductor L and the 2nd BUCK type pulse voltage source unit
2source electrode and the second sustained diode
2negative electrode connect respectively, the 3rd power switch tube S in the output inductor L other end and adjunct circuit
3drain electrode and the 3rd sustained diode
3anode connect respectively;
The 3rd power switch tube S in one end of output filter capacitor c and adjunct circuit
3source electrode and one end of load R connect respectively, negative pole and the first sustained diode of the first input dc power potential source A in the output filter capacitor c other end and a BUCK type pulse voltage source unit
1anode, the other end of load R connect respectively.
In the control system structured flowchart shown in Fig. 2, in described dual input BUCK DC converter, the first input dc power potential source A is photovoltaic cell, as main electricity; The second input dc power potential source B is storage battery, as from power supply.System adopts master-slave control method, has three kinds of mode of operations:
(1) energy shortage providing as the first input dc power potential source A when meeting load needs, guarantees the first input dc power potential source A energy that sends as much as possible, can make it be operated in maximum power point, and dump energy is supplemented by the second input dc power potential source B;
(2) when the energy providing as the first input dc power potential source A is greater than load and needs, the first input dc power potential source A is to load and the second input dc power potential source B power supply, and the second input dc power potential source B is in charged state;
(3) when the first input dc power potential source A can not export energy due to environmental factor or faults itself, bearing power is provided by the second input dc power potential source B completely.
If the maximum power that the first input dc power potential source A can provide is P
1max, load power demand is P
o, dual input BUCK DC converter completes energy management by mode decision device and multidiameter option switch MUX:
Work as P
o>P
1maxtime, mode decision device gated mode I, the output terminals A o of multidiameter option switch MUX, Bo, Co are connected with AX, BX, CX respectively, regulate the first input dc power potential source A input current reference value to realize the maximum power output of the first input dc power potential source A, realize MPPT maximum power point tracking (Maximum Power Point Tracking, MPPT), the second input dc power potential source B, by pi regulator, is converted into the second power switch tube S
2duty ratio, control the discharge power of the first input dc power potential source B, maintain load voltage stable, the 3rd power switch tube S
3in high level state;
Work as P
o<P
1maxtime, mode decision device gated mode II, the output terminals A o of multidiameter option switch MUX, Bo, Co are connected with AY, BY, CY respectively, regulate the first input dc power potential source A input current reference value to realize the maximum power output of the first input dc power potential source A, realize MPPT maximum power point tracking (Maximum Power Point Tracking, MPPT), the second input dc power potential source B, by pi regulator, is converted into the 3rd power switch tube S
3duty ratio, control the charge power of the second input dc power potential source B, maintain load voltage stable, the second power switch tube S
2in low level state;
Work as P
1max=0 o'clock, mode decision device gated mode III, the output terminals A o of multidiameter option switch MUX, Bo, Co are connected with AZ, BZ, CZ respectively, and the first input dc power potential source A blocks, and the second input dc power potential source B, by pi regulator, is converted into the second power switch tube S
2duty ratio, control the discharge power of the second input dc power potential source B, maintain load voltage stable, the 3rd power switch tube S
3in high level state.
Below in conjunction with Fig. 3～Fig. 8, the mode of operation of converter of the present invention is made a concrete analysis of.
Before analyzing, first make the following assumptions: 1. all switching tubes are desirable device, do not consider switching time, conduction voltage drop; 2. all inductance and electric capacity are desirable device.
(1) dual input BUCK DC converter, under the pattern that A, B power simultaneously, C consumes energy, has four kinds of switch mode in a switch periods, and converter principle waveform as shown in Figure 3.Under this pattern, there is d
1>d
2and d
1<d
2two kinds of situations.
1. switch mode I:
As shown in Fig. 4 (a), S
1, S
2, S
3open-minded, inductive current i
lincrease, A connects with B to C power supply, and current path is V
2-S
2-L-S
3-C-V
1-S
1.
2. switch mode II:
As shown in Fig. 4 (b), S
1, S
3open-minded, S
2turn-off D
2conducting, inductive current i
lincrease, A is separately to C power supply, and current path is V
1-S
1-D
2-L-S
3-C.
3. switch mode III:
As shown in Fig. 4 (c), S
2, S
3open-minded, S
1turn-off D
1conducting, inductive current i
lincrease, B is separately to C power supply, and current path is V
2-S
2-L-S
3-C-D
1.
4. switch mode IV:
As shown in Fig. 4 (d), S
3open-minded, S
1, S
2turn-off D
1, D
2conducting, inductance L is passed through D
1, D
2afterflow, to C power supply, inductive current i
lreduce, current path is D
1– D
2-L-S
3-C.
Under the pattern simultaneously power at A, B, C consuming energy, there is d
1>d
2and d
1<d
2two kinds of situations.Work as d
1>d
2time, converter work schedule is I-II-IV; Work as d
1<d
2time, converter work schedule is I-III-IV.Duty ratio d
1be used for controlling A power output, duty ratio d
2be used for controlling the discharge power of B, maintain load voltage stable.According to filter inductance weber equilibrium response known, during stable state, output voltage V
o=V
1d
1+ V
2d
2.
(2) dual input BUCK DC converter, in A power supply, B energy storage, C power consumption pattern lower time, has three kinds of switch mode in a switch periods, and converter principle waveform as shown in Figure 5.
1. switch mode I:
S as shown in Fig. 6 (a)
1, S
3open-minded, S
2turn-off D
2conducting, inductive current i
lincrease, A is separately to C power supply, and current path is V
1-S
1-D
2-L-S
3-C.
2. switch mode II:
As shown in Fig. 6 (b), S
3open-minded, S
1, S
2turn-off D
1, D
2conducting, inductance L is passed through D
1, D
2afterflow, to C power supply, inductive current i
lreduce, current path is D
1– D
2-L-S
3-C.
3. switch mode III:
As shown in Fig. 6 (c), S
1, S
2, S
3turn-off D
2, D
3conducting, inductance L is passed through D
3afterflow, to B-source charging, inductive current i
lreduce, current path is L-D
3-V
2-D
2.
In A power supply, B energy storage, under C power consumption pattern, duty ratio d
1be used for controlling power supply A power output, duty ratio d
3be used for controlling the charge power of power supply B, maintain load voltage stable.According to filter inductance weber equilibrium response known, during stable state, output voltage
(3) dual input BUCK DC converter is not worked in A, and B is independently-powered, C power consumption pattern lower time, in a switch periods, have two kinds of switch mode, and converter principle waveform is as shown in Figure 7.
1. switch mode I:
As shown in Fig. 8 (a), S
2, S
3open-minded, S
1turn-off D
1conducting, inductive current i
lincrease, B is separately to C power supply, and current path is V
2-S
2-L-S
3-C-D
1.
2. switch mode II:
As shown in Fig. 8 (b), S
3open-minded, S
1, S
2turn-off D
1, D
2conducting, inductance L is passed through D
1, D
2afterflow, to C power supply, inductive current i
lreduce, current path is D
1– D
2-L-S
3-C.
At A, do not work, B is independently-powered, under C power consumption pattern, and duty ratio d
2be used for controlling the discharge power of power supply B, maintain load voltage stable.According to filter inductance weber equilibrium response known, during stable state, output voltage V
o=V
2d
2.
As shown in Figure 9, dual input BUCK DC converter easily expands to N input direct-current converter, and it comprises N BUCK type pulse voltage source unit, adjunct circuit and output filter.Wherein 1～(N-1) source can be the generator units such as photovoltaic cell, wind turbine generator, fuel cell, thereby can make up the existing supply of electric power of these forms of electricity generation unstable, discontinuous, with features such as weather conditions variations, the distributed power supply system of combining power supply for multiple-energy-source provides a kind of new topology to select.
Claims (2)
1. a dual input BUCK DC converter, is characterized in that: described DC converter is connected to form by a BUCK type pulse voltage source unit, the 2nd BUCK type pulse voltage source unit, adjunct circuit and output filter circuit;
A described BUCK type pulse voltage source unit is by the first input dc power potential source A, the first power switch tube S
1with the first sustained diode
1form; The positive pole of the first input dc power potential source A and the first power switch tube S
1drain electrode connect, the first power switch tube S
1source electrode and the first sustained diode
1negative electrode connect, the first sustained diode
1anode be connected with the negative pole of the first input dc power potential source A, form a BUCK type pulse voltage source unit;
Described the 2nd BUCK type pulse voltage source unit is by the second input dc power potential source B, the second power switch tube S
2with the second sustained diode
2form; The positive pole of the second input dc power potential source B and the second power switch tube S
2drain electrode connect, the second power switch tube S
2source electrode and the second sustained diode
2negative electrode connect, the second sustained diode
2anode be connected with the negative pole of the second input dc power potential source B, form the 2nd BUCK type pulse voltage source unit;
Described adjunct circuit comprises the 3rd power switch tube S
3with the 3rd sustained diode
3, the 3rd sustained diode
3anode and the 3rd power switch tube S
3drain electrode connect, the 3rd sustained diode
3negative electrode and the 2nd BUCK type pulse voltage source unit in anodal and the second power switch tube S of the second input dc power potential source B
2drain electrode connect; The first power switch tube S in the one BUCK type pulse voltage source unit
1source electrode and the 2nd BUCK type pulse voltage source unit in negative pole and the second sustained diode of the second input dc power potential source B
2anode connect respectively;
Described output filter circuit comprises output inductor L and output filter capacitor c; The second power switch tube S in one end of output inductor L and the 2nd BUCK type pulse voltage source unit
2source electrode and the second sustained diode
2negative electrode connect respectively, the 3rd power switch tube S in the output inductor L other end and adjunct circuit
3drain electrode and the 3rd sustained diode
3anode connect respectively;
The 3rd power switch tube S in one end of output filter capacitor c and adjunct circuit
3source electrode and one end of load R connect respectively, negative pole and the first sustained diode of the first input dc power potential source A in the output filter capacitor c other end and a BUCK type pulse voltage source unit
1anode, the other end of load R connect respectively.
2. the control system of a dual input BUCK DC converter, it is characterized in that: described the first input dc power potential source A is photovoltaic cell, the second input dc power potential source B is storage battery, and two BUCK type pulse voltage source units are carried out to power division and the stable control of load voltage; The first input dc power potential source A inputs with maximum power, by maximal power tracing algorithm, keeps maximum power to input; The second input dc power potential source B, as power buffer cell, carries out energy by pi regulator and automatically distributes;
When load R demand power is greater than the power that the first input dc power potential source A provides, the second input dc power potential source B electric discharge, adjuster be output as on the occasion of, be converted into the second power switch tube S
2duty ratio, control the discharge power of the second input dc power potential source B;
When load R demand power is less than the power that the first input dc power potential source A provides, the second input dc power potential source B charging, adjuster is output as negative value, is converted into the 3rd power switch tube S
3duty ratio, control the charge power of the second input dc power potential source B, maintain load voltage stable.
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|---|---|---|---|
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| CN109617041A (en) * | 2019-02-21 | 2019-04-12 | 西南交通大学 | A kind of energy management of photovoltaic energy storage system and control device |
| CN114050811A (en) * | 2022-01-13 | 2022-02-15 | 杭州禾迈电力电子股份有限公司 | Multi-input shutoff device, control method and photovoltaic power generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104578781A (en) * | 2014-12-24 | 2015-04-29 | 西京学院 | Dual-input BUCK circuit with light-battery hybrid power supply |
| CN104578781B (en) * | 2014-12-24 | 2017-08-08 | 西京学院 | A kind of light stores joint power supply dual input BUCK circuits |
| CN106026641A (en) * | 2016-06-29 | 2016-10-12 | 儒竞艾默生环境优化技术（上海）有限公司 | Step-down DC conversion circuit, transformer and conversion method |
| CN106026641B (en) * | 2016-06-29 | 2019-04-16 | 儒竞艾默生环境优化技术（上海）有限公司 | A kind of step-down type dc translation circuit, transformer and transform method |
| CN108233713A (en) * | 2018-03-14 | 2018-06-29 | 福州大学 | A kind of non-isolated three-port DC switch converters and its control method |
| CN108233713B (en) * | 2018-03-14 | 2019-07-09 | 福州大学 | A kind of non-isolated three-port DC switch converters and its control method |
| CN109617041A (en) * | 2019-02-21 | 2019-04-12 | 西南交通大学 | A kind of energy management of photovoltaic energy storage system and control device |
| CN109617041B (en) * | 2019-02-21 | 2023-10-24 | 西南交通大学 | Energy management and control device of photovoltaic energy storage system |
| CN114050811A (en) * | 2022-01-13 | 2022-02-15 | 杭州禾迈电力电子股份有限公司 | Multi-input shutoff device, control method and photovoltaic power generation system |
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