CN104038056B - A kind of dual input BUCK DC converter and control system thereof - Google Patents
A kind of dual input BUCK DC converter and control system thereof Download PDFInfo
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Abstract
The invention discloses a kind of dual input BUCK DC converter and control system thereof, belong to converters field.Dual input BUCK DC converter includes two BUCK type pulse voltage source units and adjunct circuit, output filter circuit；Each BUCK type pulse voltage source unit all includes a direct voltage source V1(V2), a power switch tube S1(S2) and a sustained diode1(D2)；Described adjunct circuit includes a power switch tube S3With a sustained diode3；Described output filter circuit includes output inductor L and output filter capacitor c.Its control system includes two input dc power potential sources are carried out power distribution and load voltage stability contorting.The present invention have lightweight, volume is little, low cost, loss are little, the efficiency of circuit is high, ripple in output voltage waveforms is little, need not the advantages such as isolating transformer.
Description
Technical field
The present invention relates to converters field, the DC converter of a kind of dual input BUCK structure and control system thereof.
Background technology
Along with becoming increasingly conspicuous of environmental protection problem, people increasingly pay attention to the exploitation of regenerative resource.Regenerative resource has the features such as cheap, reliable, cleanliness without any pollution, energy abundance, and therefore renewable energy power generation presents good market prospect.At present, more renewable energy power generation form is applied to have photovoltaic generation, fuel cell-powered, wind-power electricity generation, water generating, geothermal power generation etc., but it is unstable, discontinuous, with features such as weather conditions changes all to there is supply of electric power in these forms of electricity generation, it is therefore desirable to use 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 typically requires a DC/DC changer, the various energy becomes direct current output, is connected in parallel on public dc bus, supply DC load, but its structure is more complicated, and relatively costly.In order to simplify circuit structure, reduce system cost, multiple single input DC converter can be replaced with a multi-input direct current converter (Multiple-Input Converter, MIC).MIC allows various energy resources input, and the character of input source, amplitude can be identical with characteristic, it is also possible to difference is the biggest, multiple input sources can separately or concurrently power to the load, therefore improve stability and the motility of system, it is achieved the Optimum utilization of the energy, and reduce system cost.
Summary of the invention
It is an object of the invention to provide that a kind of topological structure is simple, control method simple and can realize dual input BUCK DC converter and the control system thereof of the automatic Distribution utilization of energy.
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 by a BUCK type pulse voltage source unit, the 2nd BUCK type pulse voltage source unit, adjunct circuit and output filter circuit and forms；
A described BUCK type pulse voltage source unit is by the first input dc power potential source A, the first power switch tube S1With the first sustained diode1Composition；The positive pole of the first input dc power potential source A and the first power switch tube S1Drain electrode connect, the first power switch tube S1Source electrode and the first sustained diode1Negative electrode connect, the first sustained diode1Anode and the first input dc power potential source A negative pole connect, formed a BUCK type pulse voltage source unit；
Described 2nd BUCK type pulse voltage source unit is by the second input dc power potential source B, the second power switch tube S2With the second sustained diode2Composition；The positive pole of the second input dc power potential source B and the second power switch tube S2Drain electrode connect, the second power switch tube S2Source electrode and the second sustained diode2Negative electrode connect, the second sustained diode2Anode and the second input dc power potential source B negative pole connect, formed the 2nd BUCK type pulse voltage source unit；
Described adjunct circuit includes the 3rd power switch tube S3With the 3rd sustained diode3, the 3rd sustained diode3Anode and the 3rd power switch tube S3Drain electrode connect, the 3rd sustained diode3Negative electrode and the 2nd BUCK type pulse voltage source unit in the positive pole of the second input dc power potential source B and the second power switch tube S2Drain electrode connect；First power switch tube S in oneth BUCK type pulse voltage source unit1Source electrode and the 2nd BUCK type pulse voltage source unit in the negative pole of the second input dc power potential source B and the second sustained diode2Anode connect respectively；
Described output filter circuit includes output inductor L and output filter capacitor c；One end of output inductor L and the second power switch tube S in the 2nd BUCK type pulse voltage source unit2Source electrode and the second sustained diode2Negative electrode connect respectively, the 3rd power switch tube S in the output inductor L other end and adjunct circuit3Drain electrode and the 3rd sustained diode3Anode connect respectively；
One end of output filter capacitor c and the 3rd power switch tube S in adjunct circuit3Source electrode and one end of load R connect respectively, the negative pole of the first input dc power potential source A and the first sustained diode in the output filter capacitor c other end and a BUCK type pulse voltage source unit1Anode, load R the other end connect respectively.
Present invention also offers the control system of a kind of dual input BUCK DC converter, wherein the first input dc power potential source A is photovoltaic cell, second input dc power potential source B is accumulator, and two BUCK type pulse voltage source units are carried out power distribution and load voltage stability contorting；First input dc power potential source A inputs with peak power, keeps peak power to input by maximal power tracing algorithm；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 more than first input dc power potential source A provide power time, second input dc power potential source B electric discharge, actuator be output as on the occasion of, be converted into the second power switch tube S2Dutycycle, control the discharge power of the second input dc power potential source B；
When loading the power that R demand power provides less than the first input dc power potential source A, the second input dc power potential source B charging, actuator is output as negative value, is converted into the 3rd power switch tube S3Dutycycle, control the charge power of the second input dc power potential source B, maintain load voltage stable.
Compared with the prior art, the invention have the benefit that
1, lightweight, volume is little, low cost, loss are little；
2, the ripple in output voltage waveforms is little, and need not isolating transformer；
3, use two-way energy input, make full use of new forms of energy, it is achieved energy-optimised utilization；
4, can single-stage power conversion between each port, it is to avoid waste energy, it is effectively improved efficiency；
5, expansible application, conveniently realizes modularity.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of the dual input BUCK DC converter of the present invention；
Fig. 2 is the Control system architecture block diagram 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) be changer work schedule be the principle oscillogram of I-II-IV；
Fig. 3 (b) be changer work schedule be the principle oscillogram of I-III-IV；
Fig. 4 is that the present invention powers at A, B simultaneously, each equivalent switch modal graph under C power consumption pattern；
Fig. 5 be the present invention power at A, B energy storage, principle oscillogram under C power consumption pattern；
Fig. 6 be the present invention power at A, B energy storage, each equivalent switch modal graph under C power consumption pattern；
Fig. 7 is that in the present invention, A does not works, B is independently-powered, principle oscillogram under C power consumption pattern；
Fig. 8 is that in the present invention, A does not works, B is independently-powered, each equivalent switch modal graph under C power consumption pattern；
Fig. 9 is that N inputs 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, V1The input voltage of the first input dc power potential source, V2The input voltage of the second input dc power potential source, S1First power switch pipe, S2Second power switch pipe, S33rd power switch pipe, D1First fly-wheel diode, D2Second fly-wheel diode, D33rd fly-wheel diode, L output inductor, c output filter capacitor, VGS1First power switch tube drives voltage VGS2Second power switch tube drives voltage, VGS33rd power switch tube drives voltage, iLInductive current, iS1First power switch tube current, iS2Second power switch tube current, iS33rd power switch tube current, iD1First fly-wheel diode electric current, iD2Second fly-wheel diode electric current, iD33rd fly-wheel diode electric current, d1The dutycycle of the first power switch pipe, d2The dutycycle of the second power switch pipe, d3The dutycycle of the 3rd power switch pipe, VoOutput voltage.
Detailed description of the invention
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings
In the electrical schematic diagram of the DC converter of dual input BUCK shown in Fig. 1, DC converter of the present invention is connected by a BUCK type pulse voltage source unit, the 2nd BUCK type pulse voltage source unit, adjunct circuit and output filter circuit and forms；
A described BUCK type pulse voltage source unit is by the first input dc power potential source A, the first power switch tube S1With the first sustained diode1Composition；The positive pole of the first input dc power potential source A and the first power switch tube S1Drain electrode connect, the first power switch tube S1Source electrode and the first sustained diode1Negative electrode connect, the first sustained diode1Anode and the first input dc power potential source A negative pole connect, formed a BUCK type pulse voltage source unit；
Described 2nd BUCK type pulse voltage source unit is by the second input dc power potential source B, the second power switch tube S2With the second sustained diode2Composition；The positive pole of the second input dc power potential source B and the second power switch tube S2Drain electrode connect, the second power switch tube S2Source electrode and the second sustained diode2Negative electrode connect, the second sustained diode2Anode and the second input dc power potential source B negative pole connect, formed the 2nd BUCK type pulse voltage source unit；
Described adjunct circuit includes the 3rd power switch tube S3With the 3rd sustained diode3, the 3rd sustained diode3Anode and the 3rd power switch tube S3Drain electrode connect, the 3rd sustained diode3Negative electrode and the 2nd BUCK type pulse voltage source unit in the positive pole of the second input dc power potential source B and the second power switch tube S2Drain electrode connect；First power switch tube S in oneth BUCK type pulse voltage source unit1Source electrode and the 2nd BUCK type pulse voltage source unit in the negative pole of the second input dc power potential source B and the second sustained diode2Anode connect respectively；
Described output filter circuit includes output inductor L and output filter capacitor c；One end of output inductor L and the second power switch tube S in the 2nd BUCK type pulse voltage source unit2Source electrode and the second sustained diode2Negative electrode connect respectively, the 3rd power switch tube S in the output inductor L other end and adjunct circuit3Drain electrode and the 3rd sustained diode3Anode connect respectively；
One end of output filter capacitor c and the 3rd power switch tube S in adjunct circuit3Source electrode and one end of load R connect respectively, the negative pole of the first input dc power potential source A and the first sustained diode in the output filter capacitor c other end and a BUCK type pulse voltage source unit1Anode, load R the other end connect respectively.
In the Control system architecture block diagram 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；Second input dc power potential source B is accumulator, as from power supply.System uses master-slave control method, there are three kinds of mode of operations:
(1) when first input dc power potential source A provide energy be insufficient for load need time, it is ensured that the first input dc power potential source A is as much as possible sends energy, and it can be made to be operated in maximum power point, and dump energy is supplemented by the second input dc power potential source B；
(2) when the energy that the first input dc power potential source A provides needs more than load, the first input dc power potential source A powers to load and the second input dc power potential source B, 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 factors or faults itself, bearing power is provided by the second input dc power potential source B completely.
If the peak power that the first input dc power potential source A can provide is P1max, load power demand is Po, dual input BUCK DC converter completes energy management by mode decision device and multidiameter option switch MUX:
Work as Po>P1maxTime, mode decision device gated mode I, 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 passes through pi regulator, is converted into the second power switch tube S2Dutycycle, control the discharge power of the first input dc power potential source B, maintain load voltage stable, the 3rd power switch tube S3It is in high level state；
Work as Po<P1maxTime, mode decision device gated mode II, 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, i.e. realize MPPT maximum power point tracking (Maximum Power Point Tracking, MPPT), the second input dc power potential source B passes through pi regulator, is converted into the 3rd power switch tube S3Dutycycle, control the charge power of the second input dc power potential source B, maintain load voltage stable, the second power switch tube S2It is in low level state；
Work as P1maxWhen=0, mode decision device gated mode III, output terminals A o of multidiameter option switch MUX, Bo, Co be connected with AZ, BZ, CZ respectively, and the first input dc power potential source A block, the second input dc power potential source B passes through pi regulator, is converted into the second power switch tube S2Dutycycle, control the discharge power of the second input dc power potential source B, maintain load voltage stable, the 3rd power switch tube S3It is in high level state.
Below in conjunction with Fig. 3～Fig. 8, the mode of operation of changer of the present invention is made a concrete analysis of.
Before analysis, first make the following assumptions: the most all switching tubes are ideal component, do not consider switch time, conduction voltage drop；The most all inductance and electric capacity are ideal component.
(1) under dual input BUCK DC converter is in the pattern that A, B power simultaneously, C consumes energy, having four kinds of switch mode in a switch periods, converter principle waveform is as shown in Figure 3.In this mode, there is d1>d2And d1<d2Two kinds of situations.
1. switch mode I:
As shown in Fig. 4 (a), S1、S2、S3Open-minded, inductive current iLIncreasing, A with B connects and powers to C, and current path is V2-S2-L-S3-C-V1-S1。
2. switch mode II:
As shown in Fig. 4 (b), S1、S3Open-minded, S2Turn off, D2Conducting, inductive current iLIncreasing, A individually powers to C, and current path is V1-S1-D2-L-S3-C。
3. switch mode III:
As shown in Fig. 4 (c), S2、S3Open-minded, S1Turn off, D1Conducting, inductive current iLIncreasing, B individually powers to C, and current path is V2-S2-L-S3-C-D1。
4. switch mode IV:
As shown in Fig. 4 (d), S3Open-minded, S1、S2Turn off, D1、D2Conducting, inductance L passes through D1、D2Afterflow, powers to C, inductive current iLReducing, current path is D1–D2-L-S3-C。
Power at A, B simultaneously, C power consumption pattern under, there is d1>d2And d1<d2Two kinds of situations.Work as d1>d2Time, changer work schedule is I-II-IV；Work as d1<d2Time, changer work schedule is I-III-IV.Dutycycle d1It is used for controlling A output, dutycycle d2It is used for controlling the discharge power of B, maintains load voltage stable.According to filter inductance voltage-second balance characteristic, during stable state, output voltage Vo=V1d1+V2d2。
(2) dual input BUCK DC converter be in A power, B energy storage, under C power consumption pattern time, in a switch periods, have three kinds of switch mode, converter principle waveform is as shown in Figure 5.
1. switch mode I:
S as shown in Fig. 6 (a)1、S3Open-minded, S2Turn off, D2Conducting, inductive current iLIncreasing, A individually powers to C, and current path is V1-S1-D2-L-S3-C。
2. switch mode II:
As shown in Fig. 6 (b), S3Open-minded, S1、S2Turn off, D1、D2Conducting, inductance L passes through D1、D2Afterflow, powers to C, inductive current iLReducing, current path is D1–D2-L-S3-C。
3. switch mode III:
As shown in Fig. 6 (c), S1、S2、S3Turn off, D2、D3Conducting, inductance L passes through D3Afterflow, charges to B-source, inductive current iLReducing, current path is L-D3-V2-D2。
Power at A, B energy storage, under C power consumption pattern, dutycycle d1It is used for controlling power supply A output, dutycycle d3It is used for controlling the charge power of power supply B, maintains load voltage stable.According to filter inductance voltage-second balance characteristic, during stable state, output voltage
(3) dual input BUCK DC converter is in A and does not works, and B is independently-powered, time under C power consumption pattern, has two kinds of switch mode in a switch periods, and converter principle waveform is as shown in Figure 7.
1. switch mode I:
As shown in Fig. 8 (a), S2、S3Open-minded, S1Turn off, D1Conducting, inductive current iLIncreasing, B individually powers to C, and current path is V2-S2-L-S3-C-D1。
2. switch mode II:
As shown in Fig. 8 (b), S3Open-minded, S1、S2Turn off, D1、D2Conducting, inductance L passes through D1、D2Afterflow, powers to C, inductive current iLReducing, current path is D1–D2-L-S3-C。
Not working at A, B is independently-powered, under C power consumption pattern, and dutycycle d2It is used for controlling the discharge power of power supply B, maintains load voltage stable.According to filter inductance voltage-second balance characteristic, during stable state, output voltage Vo=V2d2。
As it is shown in figure 9, dual input BUCK DC converter easily expands to N input direct-current changer, it includes N number of 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 power generating set, fuel cell, such that it is able to make up supply of electric power existing for these forms of electricity generation unstable, discontinuous, with features such as weather conditions changes, the distributed power supply system combining power supply for multiple-energy-source provides a kind of new topology selection.
Claims (1)
1. a dual input BUCK DC converter, it is characterised in that: described DC converter is by first
BUCK type pulse voltage source unit, the 2nd BUCK type pulse voltage source unit, adjunct circuit and output filtered electrical
Road connects composition；
Oneth BUCK type pulse voltage source unit is by the first input dc power potential source A, the first power switch tube S1
With the first sustained diode1Composition, the positive pole of the first input dc power potential source A and the first power switch pipe
S1Drain electrode connect, the first power switch tube S1Source electrode and the first sustained diode1Negative electrode connect, the
One sustained diode1Anode and the first input dc power potential source A negative pole connect, formed a BUCK
Type pulse voltage source unit；2nd BUCK type pulse voltage source unit by the second input dc power potential source B, second
Power switch tube S2With the second sustained diode2Composition, the positive pole and second of the second input dc power potential source B
Power switch tube S2Drain electrode connect, the second power switch tube S2Source electrode and the second sustained diode2's
Negative electrode connects, the second sustained diode2Anode and the second input dc power potential source B negative pole connect, shape
Become the 2nd BUCK type pulse voltage source unit；First power switch pipe in oneth BUCK type pulse voltage source unit
S1Source electrode and the 2nd BUCK type pulse voltage source unit in the negative pole and of the second input dc power potential source B
Two sustained diode2Anode connect respectively；Adjunct circuit includes the 3rd power switch tube S3With the 3rd afterflow
Diode D3, the 3rd sustained diode3Anode and the 3rd power switch tube S3Drain electrode connect, the 3rd
Sustained diode3Negative electrode and the 2nd BUCK type pulse voltage source unit in the second input dc power potential source B
Positive pole and the second power switch tube S2Drain electrode connect；Output filter circuit includes output inductor L
With in output filter capacitor c, one end of output inductor L and the 2nd BUCK type pulse voltage source unit the
Two power switch tube S2Source electrode and the second sustained diode2Negative electrode connect respectively, output inductor
The L other end and the 3rd power switch tube S in adjunct circuit3Drain electrode and the 3rd sustained diode3Anode
Connect respectively, one end of output filter capacitor c and the 3rd power switch tube S in adjunct circuit3Source electrode with
And one end of load R connects respectively, the output filter capacitor c other end and a BUCK pulse voltage source list
The negative pole of the first input dc power potential source A and the first sustained diode in unit1Anode, load R another
One end connects respectively；
Wherein, the first input dc power potential source A is photovoltaic cell, and the second input dc power potential source B is electric power storage
Two BUCK type pulse voltage source units are carried out by pond by mode decision device and multidiameter option switch MUX
Power distribution and load voltage stability contorting；
First input dc power potential source A inputs with peak power, keeps maximum by maximal power tracing algorithm
Power inputs；Second input dc power potential source B, as power buffer cell, carries out energy by pi regulator
Automatically distribution；
When loading the power that R demand power provides more than the first input dc power potential source A, mode decision device
Gated mode I, output terminals A o of multidiameter option switch MUX, Bo, Co respectively with AX, BX, CX
It is connected, the second input dc power potential source B electric discharge, it is converted into the second power switch tube S2Dutycycle, control
The discharge power of the second input dc power potential source B, the 3rd power switch tube S3It is in high level state；
When the power that load demand power provides less than the first input dc power potential source A, mode decision device selects
Logical pattern II, output terminals A o of multidiameter option switch MUX, Bo, Co respectively with AY, BY, CY phase
Even, the second input dc power potential source B charging, it is converted into the 3rd power switch tube S3Dutycycle, control the
The charge power of two input dc power potential source B, maintains load voltage stable, the second power switch tube S2It is in
Low level state.
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| CN104578781B (en) * | 2014-12-24 | 2017-08-08 | 西京学院 | A kind of light stores joint power supply dual input BUCK circuits |
| 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 |
| 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 |
| CN109617041B (en) * | 2019-02-21 | 2023-10-24 | 西南交通大学 | Energy management and control device of photovoltaic energy storage system |
| CN114050811B (en) * | 2022-01-13 | 2022-05-17 | 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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| CN102882370A (en) * | 2012-09-13 | 2013-01-16 | 燕山大学 | Bidirectional two-input BUCK direct-current converter and power distribution method thereof |
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